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Gibbon River Bridge No. 2, Spanning Gibbon River at Grand Loop Road, Lake, Teton County, WY

Gibbon River Bridge No. 2, Spanning Gibbon River at Grand Loop Road, L...

Significance: Gibbon River Bridge II typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize manmade features with their natural surroundings. This... More

Historic Columbia River Highway, Oneonta Tunnel, Adjacent to Historic Columbia River Highway through Oneonta Point, Troutdale, Multnomah County, OR

Historic Columbia River Highway, Oneonta Tunnel, Adjacent to Historic ...

Significance: One of four tunnels on the Historic Columbia River Highway. Survey number: HAER OR-36-L Building/structure dates: 1914 Initial Construction Building/structure dates: 1948 Subsequent Work Build... More

Otter Creek Bridge No. 2, Spanning Otter Creek at spur of Grand Loop Road, Lake, Teton County, WY

Otter Creek Bridge No. 2, Spanning Otter Creek at spur of Grand Loop R...

Significance: Otter Creek Bridge II typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize man-made features with their natural surroundings. This... More

Horton Mill Bridge, Spanning Little Warrior River, Oneonta, Blount County, AL

Horton Mill Bridge, Spanning Little Warrior River, Oneonta, Blount Cou...

Significance: The Horton Mill Bridge is one of three surviving covered bridges in Blount County, Alabama, one of the last strongholds of covered bridge building in the United States. Spanning an impressive 70-... More

Acadia National Park Motor Roads, Bar Harbor, Hancock County, ME

Acadia National Park Motor Roads, Bar Harbor, Hancock County, ME

Significance: Motorists visiting Acadia National Park enjoy a variety of experiences on the park's acclaimed road system. The principal park road is the Park Loop Road, a 20-mile circuit around the eastern hal... More

Baltimore-Washington Parkway, Greenbelt, Prince George's County, MD

Baltimore-Washington Parkway, Greenbelt, Prince George's County, MD

Significance: The federal section of the Baltimore-Washington Parkway was constructed to provide a dignified entrance to the nation's capital. The parkway also provided a new traffic artery that relieved conge... More

Crater Lake National Park Roads, Klamath Falls, Klamath County, OR

Crater Lake National Park Roads, Klamath Falls, Klamath County, OR

Significance: The primary roads in Crater Lake National Park were designed and constructed to provide visitor access to the park's scenic features, which are largely concentrated along the rim of Crater Lake. ... More

Merritt Parkway, Hillside Road Bridge, Spanning Hillside Road, Fairfield, Fairfield County, CT

Merritt Parkway, Hillside Road Bridge, Spanning Hillside Road, Fairfie...

Significance: The bridges of the Merritt Parkway were predominately inspired by the Art Deco and Art Moderne architectural styles of the 1930s. Experimental forming techniques were employed to create the orname... More

Stevens Creek Bridge, Spanning Stevens Creek on Stevens Canyon Highway, Packwood, Lewis County, WA

Stevens Creek Bridge, Spanning Stevens Creek on Stevens Canyon Highway...

Significance: The Stevens Creek Bridge represents a transition in the park road bridges from standard reinforced concrete arches to arched girder designs. Its stone facing is characteristic of the National Par... More

Lightship 116, Pier 3, Inner Harbor, Baltimore, Independent City, MD

Lightship 116, Pier 3, Inner Harbor, Baltimore, Independent City, MD

Significance: Lightship 116 is one of the last extant lightships in the United States and has had few modifications during its service. Four generations of lightships were in use in the United States from 1820 ... More

Lightship 116, Pier 3, Inner Harbor, Baltimore, Independent City, MD

Lightship 116, Pier 3, Inner Harbor, Baltimore, Independent City, MD

Significance: Lightship 116 is one of the last extant lightships in the United States and has had few modifications during its service. Four generations of lightships were in use in the United States from 1820 ... More

Zion-Mount Carmel Highway, Short Tunnel, Passing through Rock Spur on Zion-Mount Carmel Highway, Springdale, Washington County, UT

Zion-Mount Carmel Highway, Short Tunnel, Passing through Rock Spur on ...

Significance: The development of the Zion-Mt. Carmel Highway is significant to the development of the National Parks in Utah and Arizona. Access to the for parks in this area, Bryce Canyon, Grand Canyon, Cedar... More

Snake River Bridge at Lyons' Ferry, State Route 261 spanning Snake River, Starbuck, Columbia County, WA

Snake River Bridge at Lyons' Ferry, State Route 261 spanning Snake Riv...

Significance: The oldest extant steel cantilever bridge in Washington. It is a good example of early-twentieth century cantilever bridge construction using carbon steel. The structure served first at Vantage Fe... More

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congress Street, Boston, Suffolk County, MA

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congress Street, Boston, Suffolk County, MA

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congress Street, Boston, Suffolk County, MA

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congress Street, Boston, Suffolk County, MA

Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More

Fishing Bridge, Spanning Yellowstone River at East Entrance Road, Lake, Teton County, WY

Fishing Bridge, Spanning Yellowstone River at East Entrance Road, Lake...

Significance: Fishing Bridge typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize man-made features with their natural surroundings. This philos... More

Fishing Bridge, Spanning Yellowstone River at East Entrance Road, Lake, Teton County, WY

Fishing Bridge, Spanning Yellowstone River at East Entrance Road, Lake...

Significance: Fishing Bridge typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize man-made features with their natural surroundings. This philos... More

Fishing Bridge, Spanning Yellowstone River at East Entrance Road, Lake, Teton County, WY

Fishing Bridge, Spanning Yellowstone River at East Entrance Road, Lake...

Significance: Fishing Bridge typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize man-made features with their natural surroundings. This philos... More

St. Charles Air Line Bridge, Spanning South Branch of Chicago River, north of Sixteenth Street, Chicago, Cook County, IL

St. Charles Air Line Bridge, Spanning South Branch of Chicago River, n...

Significance: Like all Strauss heel-trunnion bascule bridges, the St. Charles Air Line Bridge rotates vertically, lifting to clear the river it spans. This particular bridge is unique, however, in that its des... More

Merritt Parkway, South Avenue/Route 124 Bridge, Spanning Merritt Parkway, New Canaan, Fairfield County, CT

Merritt Parkway, South Avenue/Route 124 Bridge, Spanning Merritt Parkw...

Significance: The bridges of the Merritt Parkway were predominately inspired by the Art Deco and Art Moderne architectural style of the 1930s. Experimental forming techniques were employed to create the orname... More

Crater Lake National Park Roads, Goodbye Creek Bridge, Spanning Goodbye Creek at Munson Valley Road, Klamath Falls, Klamath County, OR

Crater Lake National Park Roads, Goodbye Creek Bridge, Spanning Goodby...

Significance: This is one of the earliest examples of glue-laminate bridge work in America. Survey number: HAER OR-107-A Building/structure dates: 1954 Initial Construction

Crater Lake National Park Roads, Goodbye Creek Bridge, Spanning Goodbye Creek at Munson Valley Road, Klamath Falls, Klamath County, OR

Crater Lake National Park Roads, Goodbye Creek Bridge, Spanning Goodby...

Significance: This is one of the earliest examples of glue-laminate bridge work in America. Survey number: HAER OR-107-A Building/structure dates: 1954 Initial Construction

Crater Lake National Park Roads, Goodbye Creek Bridge, Spanning Goodbye Creek at Munson Valley Road, Klamath Falls, Klamath County, OR

Crater Lake National Park Roads, Goodbye Creek Bridge, Spanning Goodby...

Significance: This is one of the earliest examples of glue-laminate bridge work in America. Survey number: HAER OR-107-A Building/structure dates: 1954 Initial Construction

Colonial Parkway, Navy Mine Depot, Spanning Naval Weapons Road, Yorktown, York County, Virginia

Colonial Parkway, Navy Mine Depot, Spanning Naval Weapons Road, Yorkto...

Significance: As one of the first two completed structures on the Colonial Parkway, the Navy Mine Depot Overpass employed the characteristic colonial brickwork and reinforced concrete arch design indicative of ... More

Historic Columbia River Highway, Crown Point Viaduct, Encircling Vista House at Crown Point, Troutdale, Multnomah County, OR

Historic Columbia River Highway, Crown Point Viaduct, Encircling Vista...

Significance: A half-viaduct designed to carry pedestrians around the outer edge of a spiral section of roadway around the top of a 725' promontory on the Historic Columbia River Highway. Ingenious use of rein... More

Historic Columbia River Highway, Crown Point Viaduct, Encircling Vista House at Crown Point, Troutdale, Multnomah County, OR

Historic Columbia River Highway, Crown Point Viaduct, Encircling Vista...

Significance: A half-viaduct designed to carry pedestrians around the outer edge of a spiral section of roadway around the top of a 725' promontory on the Historic Columbia River Highway. Ingenious use of rein... More

Conrail Port Perry Bridge, Spanning Monongahela River, Port Perry, Allegheny County, PA

Conrail Port Perry Bridge, Spanning Monongahela River, Port Perry, All...

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive... More

Mauna Loa Road, Volcano, Hawaii County, HI

Mauna Loa Road, Volcano, Hawaii County, HI

Significance: The Hawaii Volcanoes National Park road system provides access to active volcanoes and related landscapes along with varied ecosystems and archaeological sites. It represents the traditional NPS ... More

Baltimore & Ohio Railroad, Harpers Ferry Station, Potomac Street, Harpers Ferry, Jefferson County, WV

Baltimore & Ohio Railroad, Harpers Ferry Station, Potomac Street, Harp...

Significance: The train station at Harpers Ferry provides an excellent opportunity to study the relationship between railroad engineering and railroad economics. Designed by architect E. Francis Baldwin, the s... More

Merritt Parkway, Frenchtown Road Bridge, Spanning Merritt Parkway, Trumbull, Fairfield County, CT

Merritt Parkway, Frenchtown Road Bridge, Spanning Merritt Parkway, Tru...

Significance: The bridges of the Merritt Parkway were predominately inspired by the Art Deco and Art Moderne architectural styles of the 1930s. Experimental forming techniques were employed to create the ornam... More

Copper River & Northwestern Railroad, Gilahina Bridge, Mile 28.5, McCarthy Road, Chitina, Valdez-Cordova Census Area, AK

Copper River & Northwestern Railroad, Gilahina Bridge, Mile 28.5, McCa...

Significance: Part of the Copper River and Northwestern Railway route, this bridge illustrates the ingenuity and drive of the railroad builders. Built during the winter of 1911 in only eleven days, this 180 fo... More

Davis Avenue Bridge, Spanning Woods Run Avenue at Davis Avenue, Pittsburgh, Allegheny County, PA

Davis Avenue Bridge, Spanning Woods Run Avenue at Davis Avenue, Pittsb...

Significance: The bridge is a cantilevered structure constructed for transportation, social, and municipal purposes. Constructed before Allegheny City was consolidated into greater Pittsburgh, the bridge repres... More

Davis Avenue Bridge, Spanning Woods Run Avenue at Davis Avenue, Pittsburgh, Allegheny County, PA

Davis Avenue Bridge, Spanning Woods Run Avenue at Davis Avenue, Pittsb...

Significance: The bridge is a cantilevered structure constructed for transportation, social, and municipal purposes. Constructed before Allegheny City was consolidated into greater Pittsburgh, the bridge repres... More

Maggie Creek Bridge, 11 miles west of Elko, Elko, Elko County, NV

Maggie Creek Bridge, 11 miles west of Elko, Elko, Elko County, NV

Survey number: HAER NV-38 Public domain photograph - historical image of Nevada, United States, free to use, no copyright restrictions image - Picryl description

Falls Bridge, Spanning Schuylkill River, connecting East & West River Drives, Philadelphia, Philadelphia County, PA

Falls Bridge, Spanning Schuylkill River, connecting East & West River ...

Significance: The Falls Bridge is a unique and well-preserved example of the Petit through truss design, capable of carrying a roadway on both its upper and lower chords. The upper deck remains incomplete, but... More

Falls Bridge, Spanning Schuylkill River, connecting East & West River Drives, Philadelphia, Philadelphia County, PA

Falls Bridge, Spanning Schuylkill River, connecting East & West River ...

Significance: The Falls Bridge is a unique and well-preserved example of the Petit through truss design, capable of carrying a roadway on both its upper and lower chords. The upper deck remains incomplete, but... More

Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, South of Lock & Dam No. 7, New Geneva, Fayette County, PA

Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...

Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More

Merritt Parkway, Merwins Lane Bridge, Fairfield, Fairfield County, CT

Merritt Parkway, Merwins Lane Bridge, Fairfield, Fairfield County, CT

Significance: The bridges of the Merritt Parkway were predominately inspired by the Art Deco and Art Moderne architectural styles of the 1930s. Experimental forming techniques were employed to create the orname... More

Historic Columbia River Highway, Mosier Creek Bridge, Spanning Mosier Creek carrying Historic Columbia River Highway, Troutdale, Multnomah County, OR

Historic Columbia River Highway, Mosier Creek Bridge, Spanning Mosier ...

Survey number: HAER OR-36-U National Register of Historic Places NRIS Number: 83004168

Merritt Parkway, Ponus Ridge Road Bridge, Spanning Merritt Parkway, New Canaan, Fairfield County, CT

Merritt Parkway, Ponus Ridge Road Bridge, Spanning Merritt Parkway, Ne...

Significance: The bridges of the Merritt Parkway were predominately inspired by the Art Deco and Art Moderne architectural style of the 1930s. Experimental forming techniques were employed to create the orname... More

Atchison, Topeka, Santa Fe Railroad, Albuquerque Shops, Boiler Shop, 908 Second Street, Southwest, Albuquerque, Bernalillo County, NM

Atchison, Topeka, Santa Fe Railroad, Albuquerque Shops, Boiler Shop, 9...

Significance: The Albuquerque Shops were built from 1914-1924 and serviced the Santa Fe Railway's rolling stock. Survey number: HAER NM-12-A Building/structure dates: 1914-1924 Initial Construction

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Significance: TICONDEROGA, considered to be the only extant unmodified vessel of its type in the United States, symbolizes an era of travel that has all but vanished from American waters. One of only two remain... More

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Significance: TICONDEROGA, considered to be the only extant unmodified vessel of its type in the United States, symbolizes an era of travel that has all but vanished from American waters. One of only two remain... More

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Significance: TICONDEROGA, considered to be the only extant unmodified vessel of its type in the United States, symbolizes an era of travel that has all but vanished from American waters. One of only two remain... More

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Significance: TICONDEROGA, considered to be the only extant unmodified vessel of its type in the United States, symbolizes an era of travel that has all but vanished from American waters. One of only two remain... More

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Significance: TICONDEROGA, considered to be the only extant unmodified vessel of its type in the United States, symbolizes an era of travel that has all but vanished from American waters. One of only two remain... More

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Significance: TICONDEROGA, considered to be the only extant unmodified vessel of its type in the United States, symbolizes an era of travel that has all but vanished from American waters. One of only two remain... More

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

Significance: TICONDEROGA, considered to be the only extant unmodified vessel of its type in the United States, symbolizes an era of travel that has all but vanished from American waters. One of only two remain... More

Christine Falls Bridge, Spanning Van Trump Creek on Nisqually Road, Longmire, Pierce County, WA

Christine Falls Bridge, Spanning Van Trump Creek on Nisqually Road, Lo...

Significance: The "rustic style" Christine Falls Bridge carries the Nisqually Road over the narrow box canyon of Van Trump Creek at Christine Falls. The graceful stone-faced reinforced concrete spandrel arch b... More

Christine Falls Bridge, Spanning Van Trump Creek on Nisqually Road, Longmire, Pierce County, WA

Christine Falls Bridge, Spanning Van Trump Creek on Nisqually Road, Lo...

Significance: The "rustic style" Christine Falls Bridge carries the Nisqually Road over the narrow box canyon of Van Trump Creek at Christine Falls. The graceful stone-faced reinforced concrete spandrel arch b... More

Bessemer & Lake Erie Railroad, Allegheny River Bridge, Spanning Allegheny River, East of Pennsylvania Turnpike (I-76), Oakmont, Allegheny County, PA

Bessemer & Lake Erie Railroad, Allegheny River Bridge, Spanning Allegh...

Significance: The bridge was designed by two U.S. Steel subsidiaries - the railroad and the American Bridge Company - as a showpiece for their parent company. This structure not only introduced new silicon stee... More

Stevens Canyon Highway, Between Paradise, WA, & State Highway 123, Ashford, Pierce County, WA

Stevens Canyon Highway, Between Paradise, WA, & State Highway 123, Ash...

Significance: The Stevens Canyon Highway was the last segment of the Mount Rainier National Park partial circuit road system to be constructed. Although not completed until 1957, the road features a number of ... More

Stevens Canyon Highway, Between Paradise, WA, & State Highway 123, Ashford, Pierce County, WA

Stevens Canyon Highway, Between Paradise, WA, & State Highway 123, Ash...

Significance: The Stevens Canyon Highway was the last segment of the Mount Rainier National Park partial circuit road system to be constructed. Although not completed until 1957, the road features a number of ... More

Frying Pan Creek Bridge, Spanning Frying Pan Creek on Yakima Park Highway, Longmire, Pierce County, WA

Frying Pan Creek Bridge, Spanning Frying Pan Creek on Yakima Park High...

Significance: Frying Pan Creek Bridge is an uncommon example of three-hinged steel web girder bridge in a park generally featuring stone-faced reinforced concrete bridges. The abutments and spandrel walls are ... More

Chain of Craters Road, Volcano, Hawaii County, HI

Chain of Craters Road, Volcano, Hawaii County, HI

Significance: The Hawaii Volcanoes National Park road system provides access to active volcanoes and related landscapes along with varied ecosystems and archaeological sites. It represents the traditional NPS ... More

Merritt Parkway, Lake Avenue Bridge, Spanning Merritt Parkway at 4.71 mile mark, Greenwich, Fairfield County, CT

Merritt Parkway, Lake Avenue Bridge, Spanning Merritt Parkway at 4.71 ...

Significance: The bridges of the Merritt Parkway were predominately inspired by the Art Deco and Art Moderne architectural styles of the 1930s. Experimental forming techniques were employed to create the ornam... More

Western Railway of Alabama Montgomery Rail Shops, 701 North Perry Street, Montgomery, Montgomery County, AL

Western Railway of Alabama Montgomery Rail Shops, 701 North Perry Stre...

Significance: When built, the Western Railway of Alabama shops at Montgomery were hailed as the largest in Alabama and the best equipped in the South. Their connection with the second oldest railroad in Alabam... More

Seven Mile Bridge, Spanning Gardner River at Grand Loop Road, Lake, Teton County, WY

Seven Mile Bridge, Spanning Gardner River at Grand Loop Road, Lake, Te...

Significance: Seven Mile Bridge typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize man-made features with their natural surroundings. This phi... More

Gibbon River Bridge No. 1, Spanning Gibbon River at Grand Loop Road, Lake, Teton County, WY

Gibbon River Bridge No. 1, Spanning Gibbon River at Grand Loop Road, L...

Significance: Gibbon River Bridge I typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize manmade features with their natural surroundings. This ... More

Pittsburgh & Lake Erie Railroad, Ohio River Bridge, Spanning Ohio River, West of Beaver River, Beaver, Beaver County, PA

Pittsburgh & Lake Erie Railroad, Ohio River Bridge, Spanning Ohio Rive...

Significance: The bridge is significant for its relatively long and heavy cantilever truss, planned shortly before the Quebec cantilever bridge collapse of 1907. Rather than select a different design, the railr... More

Chicago, Milwaukee & St. Paul Railway, Bridge No. Z-2, Spanning North Branch Canal at North Cherry Avenue, Chicago, Cook County, IL

Chicago, Milwaukee & St. Paul Railway, Bridge No. Z-2, Spanning North ...

Significance: The Chicago, Milwaukee & St. Paul Railway's Bridge No. Z-2 is not only one of a few remaining swing bridges in Chicago, but is also of a rare asymmetrical or "bob-tail" type. The pivot pier is on... More

Nisqually Suspension Bridge, Spanning Nisqually River on Service Road, Longmire, Pierce County, WA

Nisqually Suspension Bridge, Spanning Nisqually River on Service Road,...

Significance: The oldest surviving road bridge in Mount Rainier National Park, the Nisqually River Suspension Bridge is one of the few road-bearing suspension bridges in the National Park system. Although shor... More

Nisqually Suspension Bridge, Spanning Nisqually River on Service Road, Longmire, Pierce County, WA

Nisqually Suspension Bridge, Spanning Nisqually River on Service Road,...

Significance: The oldest surviving road bridge in Mount Rainier National Park, the Nisqually River Suspension Bridge is one of the few road-bearing suspension bridges in the National Park system. Although shor... More

Roundup Bridge, Spanning Musselshell River, Roundup, Musselshell County, MT

Roundup Bridge, Spanning Musselshell River, Roundup, Musselshell Count...

Survey number: HAER MT-25 Building/structure dates: 1894 Building/structure dates: 1911

Roundup Bridge, Spanning Musselshell River, Roundup, Musselshell County, MT

Roundup Bridge, Spanning Musselshell River, Roundup, Musselshell Count...

Survey number: HAER MT-25 Building/structure dates: 1894 Building/structure dates: 1911

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worcester County, MA

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...

Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worcester County, MA

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...

Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worcester County, MA

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...

Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worcester County, MA

Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...

Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More

Philadelphia & Reading Railroad, Pedestrian Suspension Bridge, Foot of Sixth Street at Schuylkill River (formerly spanned Philadelphia & Reading main line at Reading Depot), Reading, Berks County, PA

Philadelphia & Reading Railroad, Pedestrian Suspension Bridge, Foot of...

See also HAER PA-121 for related documentation. Includes photographs. Significance: The Philadelphia & Reading Railroad's pedestrian suspension bridge was typical of short spans produced by the John A. Roebling... More

Bayonne Bridge, Spanning Kill Van Kull between Bayonne & Staten Island, Bayonne, Hudson County, NJ

Bayonne Bridge, Spanning Kill Van Kull between Bayonne & Staten Island...

Significance: Bayonne Bridge is significant as the world's longest steel bridge for nearly half a century, the first use of manganese steel (for main arch ribs and rivets), and the use of falsework for construc... More

Merritt Parkway, Grumman Avenue Bridge, Spanning Merritt Parkway, Norwalk, Fairfield County, CT

Merritt Parkway, Grumman Avenue Bridge, Spanning Merritt Parkway, Norw...

Significance: The bridges of the Merritt Parkway were predominately inspired by the Art Deco and Art Moderne architectural styles of the 1930s. Experimental forming techniques were employed to create the ornam... More

Big Conestoga Creek Bridge No. 12, Spanning Conestoga River at Farmersville Road (State Route 1010), Brownstown, Lancaster County, PA

Big Conestoga Creek Bridge No. 12, Spanning Conestoga River at Farmers...

Significance: Big Conestoga Creek Bridge No. 12 is a rare combination of cantilever, arch and through-girder forms in reinforced concrete. Lancaster County engineer Frank H. Shaw, designing to meet economic co... More

Pine Creek Bridge, Spanning Pine Creek at Messerall Road (Township Route 993), Titusville, Crawford County, PA

Pine Creek Bridge, Spanning Pine Creek at Messerall Road (Township Rou...

Significance: The bridge is an excellent example of a small wrought-iron bowstring truss. A prefabricated structure, it demonstrates the versatility of wrought iron and the speed with which it could be assemble... More

Deadwood Creek Bridge, Spanning Deadwood Creek on Mather Memorial Parkway, Longmire, Pierce County, WA

Deadwood Creek Bridge, Spanning Deadwood Creek on Mather Memorial Park...

Significance: The only reinforced concrete open spandrel arch bridge in the park, the Deadwood Creek Bridge represents a marked departure from the "rustic style" bridges which were generally built elsewhere at ... More

Swann Bridge, Spanning Locust Fork of Black Warrior River, Swann Bridge Road, Cleveland, Blount County, AL

Swann Bridge, Spanning Locust Fork of Black Warrior River, Swann Bridg...

Significance: Swann Bridge is one of three surviving covered bridges in Blount County, Alabama, one of the last strongholds of covered bridge building in the United States. Survey number: HAER AL-201 Building... More

Swann Bridge, Spanning Locust Fork of Black Warrior River, Swann Bridge Road, Cleveland, Blount County, AL

Swann Bridge, Spanning Locust Fork of Black Warrior River, Swann Bridg...

Significance: Swann Bridge is one of three surviving covered bridges in Blount County, Alabama, one of the last strongholds of covered bridge building in the United States. Survey number: HAER AL-201 Building... More

Swann Bridge, Spanning Locust Fork of Black Warrior River, Swann Bridge Road, Cleveland, Blount County, AL

Swann Bridge, Spanning Locust Fork of Black Warrior River, Swann Bridg...

Significance: Swann Bridge is one of three surviving covered bridges in Blount County, Alabama, one of the last strongholds of covered bridge building in the United States. Survey number: HAER AL-201 Building... More

South Branch Quantico Creek Bridge, NPS Route 11 spanning south branch of Quantico Creek, Dumfries, Prince William County, Virginia

South Branch Quantico Creek Bridge, NPS Route 11 spanning south branch...

Significance: The design and construction of this structure represent a renewal of interest in rustic forms of architecture that also influenced the construction of this bridge. This style highlighted the use ... More

Larimer Avenue Bridge, Spanning Washington Boulevard at Larimer Avenue (State Route 8), Pittsburgh, Allegheny County, PA

Larimer Avenue Bridge, Spanning Washington Boulevard at Larimer Avenue...

Significance: At the time of its construction, the bridge was the world's longest reinforced concrete arch span. The bridge was part of a large public works program in Pittsburgh responding to several reports c... More

Pittsburgh, Fort Wayne & Chicago Railway, Calumet River Bridge, Spanning Calumet River, east of Chicago Skyway (I-90), Chicago, Cook County, IL

Pittsburgh, Fort Wayne & Chicago Railway, Calumet River Bridge, Spanni...

See also HAER IL-161 for additional documentation. Significance: The Pittsburgh, Fort Wayne & Chicago Railway's two parallel vertical-lift spans over the Calumet River (of which one survives), and two neighbori... More

Pittsburgh, Fort Wayne & Chicago Railway, Calumet River Bridge, Spanning Calumet River, east of Chicago Skyway (I-90), Chicago, Cook County, IL

Pittsburgh, Fort Wayne & Chicago Railway, Calumet River Bridge, Spanni...

See also HAER IL-161 for additional documentation. Significance: The Pittsburgh, Fort Wayne & Chicago Railway's two parallel vertical-lift spans over the Calumet River (of which one survives), and two neighbori... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

Western Maryland Railway, Cumberland Extension, Pearre to North Branch...

Significance: The westward expansion of the Western Maryland Railway, beginning with the Cumberland Extension, was one of the last new mainlines constructed during the U.S. railroads' period of extensive growth... More

Cub Creek Bridge, Spanning Cub Creek at East Entrance Road, Lake, Teton County, WY

Cub Creek Bridge, Spanning Cub Creek at East Entrance Road, Lake, Teto...

Significance: Cub Creek Bridge typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize man-made features with their natural surroundings. This phil... More

Cub Creek Bridge, Spanning Cub Creek at East Entrance Road, Lake, Teton County, WY

Cub Creek Bridge, Spanning Cub Creek at East Entrance Road, Lake, Teto...

Significance: Cub Creek Bridge typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize man-made features with their natural surroundings. This phil... More

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