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Bellows Falls Arch Bridge, Spanning Connecticut River, North Walpole, Cheshire County, NH

Bellows Falls Arch Bridge, Spanning Connecticut River, North Walpole, ...

Significance: When built, the bridge was the longest single span highway bridge in the U.S. and is was among the largest three-hinged arch bridges in the world. The structure has also played an important role i... More

Greenville Yard, Transfer Bridge System, Port of New York/New Jersey, Upper New York Bay, Jersey City, Hudson County, NJ

Greenville Yard, Transfer Bridge System, Port of New York/New Jersey, ...

Significance: The Greenville Yard Transfer Bridge System is the last surviving example in New York Harbor of a suspended-type car float transfer bridge. The innovative design of the transfer bridge was introdu... More

Eighteenth Street Bridge, Saint Louis, Independent City, MO

Eighteenth Street Bridge, Saint Louis, Independent City, MO

Significance: The Eighteenth Street Bridge is a 1,054-foot-long through-truss and through-plate girder structure with distinctive ornamentation over each truss portal in the form of finials and cresting, and pe... More

Eighteenth Street Bridge, Saint Louis, Independent City, MO

Eighteenth Street Bridge, Saint Louis, Independent City, MO

Significance: The Eighteenth Street Bridge is a 1,054-foot-long through-truss and through-plate girder structure with distinctive ornamentation over each truss portal in the form of finials and cresting, and pe... More

Chicago, Rock Island & Pacific Railroad, Illinois & Michigan Canal Bridge, Spanning I&M Canal, west of Manville Corporation factory, Rockdale, Will County, IL

Chicago, Rock Island & Pacific Railroad, Illinois & Michigan Canal Bri...

Significance: Of the two surviving plate-girder swing bridges built across the I & M Canal, the Chicago, Rock Island & Pacific Canal Bridge is the only one which contains a center pivot pier. The others were b... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA

San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...

Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More

Bush Terminal Company, Pier 5, Opposite end of Forty-first Street on Upper New York Bay, Brooklyn, Kings County, NY

Bush Terminal Company, Pier 5, Opposite end of Forty-first Street on U...

Significance: Pier 5 was typical of the substructures and piersheds built by Irving Bush c. 1902-09, sheet-piling-retained fill. It survives partly intact, and retains the best evidence of late attempts to mod... More

Choctaw Bottoms Road Bridge, Spanning Choctaw Creek at Choctaw Bottoms Road, Denison, Grayson County, TX

Choctaw Bottoms Road Bridge, Spanning Choctaw Creek at Choctaw Bottoms...

Significance: The Choctaw Bottoms Road Bridge is one of two extant bridges in Texas known to have been erected by the American Bridge Company of New York, a major twentieth-century bridge building firm. Survey... More

Passerelle in Lincoln Park, Spanning North Lake Shore Drive (U.S. Route 41) on axis of East Menomonee Street, Chicago, Cook County, IL

Passerelle in Lincoln Park, Spanning North Lake Shore Drive (U.S. Rout...

Significance: This pedestrian bridge, or passerelle, is the only one spanning North Lake Shore Drive, a major commuter route through Chicago's Lincoln Park. The strikingly modern welded steel arch with concret... More

Steel Bridge, Spanning Willamette River at State Route 99, Portland, Multnomah County, OR

Steel Bridge, Spanning Willamette River at State Route 99, Portland, M...

Significance: An early example of the Waddell-type vertical lift bridge, the Steel Bridge documents that, guided by Harrington, most features of the type achieved "standard" form by 1912. It also demonstrates ... More

Sparkman Street Bridge, Spanning Cumberland River, Nashville, Davidson County, TN

Sparkman Street Bridge, Spanning Cumberland River, Nashville, Davidson...

Significance: The bridge possesses state level engineering significance as an example of the through Parker and camelback truss types for its uncommon concrete trusses. The bridge possesses local significance a... More

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old Lyme, New London County, CT

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old ...

Significance: Erected in 1934 by the Federal Emergency Relief Administration, the Rocky Neck Park Trail Bridge is a key transportation element of Rocky Neck Park and carries a foot trail across the New Haven ra... 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

U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela River, Homestead, Allegheny County, PA

U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela Riv...

See also HAER PA-200 for additional documentation. Includes written data (pages 76 through 94). Significance: As a group, the structures and steel-making equipment from Homestead Works represented one of the na... More

U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela River, Homestead, Allegheny County, PA

U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela Riv...

See also HAER PA-200 for additional documentation. Includes written data (pages 76 through 94). Significance: As a group, the structures and steel-making equipment from Homestead Works represented one of the na... More

Centennial Bridge, Spanning Mississippi River at U.S. Highway 61, Davenport, Scott County, IA

Centennial Bridge, Spanning Mississippi River at U.S. Highway 61, Dave...

Significance: This bridge is a major river span and was the first tied-arch span across the Mississippi River. The bridge was fabricated, and the superstructure built, by American Bridge Company, New York, one... More

New York, New Haven & Hartford Railroad, Mystic River Bridge, Spanning Mystic River between Groton & Stonington, Groton, New London County, CT

New York, New Haven & Hartford Railroad, Mystic River Bridge, Spanning...

Significance: The Mystic River Bridge is a center bearing, through truss swing bridge. It is significant as part of the transportation link in the shoreline route of the New York, New Haven and Hartford Railro... More

New York, New Haven & Hartford Railroad, Mystic River Bridge, Spanning Mystic River between Groton & Stonington, Groton, New London County, CT

New York, New Haven & Hartford Railroad, Mystic River Bridge, Spanning...

Significance: The Mystic River Bridge is a center bearing, through truss swing bridge. It is significant as part of the transportation link in the shoreline route of the New York, New Haven and Hartford Railro... More

U.S. Steel Duquesne Works, West bank of Monongahela River along State Route 837, Duquesne, Allegheny County, PA

U.S. Steel Duquesne Works, West bank of Monongahela River along State ...

Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integrated steel producing ventures in the Monongahela Valley of western Pennsylvania. Constructed af... More

Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Avenue between Ninth & Thirteenth Streets, Boston, Suffolk County, MA

Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Aven...

The Boston Redevelopment Authority hired William A. Owens to document all buildings in the Charlestown Navy Yard in 1977, most of which were exterior photographs. Significance: The Charlestown Navy Yard comple... More

Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Avenue between Ninth & Thirteenth Streets, Boston, Suffolk County, MA

Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Aven...

The Boston Redevelopment Authority hired William A. Owens to document all buildings in the Charlestown Navy Yard in 1977, most of which were exterior photographs. Significance: The Charlestown Navy Yard comple... More

Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Avenue between Ninth & Thirteenth Streets, Boston, Suffolk County, MA

Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Aven...

The Boston Redevelopment Authority hired William A. Owens to document all buildings in the Charlestown Navy Yard in 1977, most of which were exterior photographs. Significance: The Charlestown Navy Yard comple... More

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown & Marietta, Williamstown, Wood County, WV

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...

Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown & Marietta, Williamstown, Wood County, WV

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...

Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown & Marietta, Williamstown, Wood County, WV

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...

Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown & Marietta, Williamstown, Wood County, WV

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...

Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown & Marietta, Williamstown, Wood County, WV

Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...

Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More

Chicago River Bascule Bridge, Wabash Avenue, Spanning Chicago River at North Wabash Avenue, Chicago, Cook County, IL

Chicago River Bascule Bridge, Wabash Avenue, Spanning Chicago River at...

Significance: In 1930 the Wabash Bridge was awarded the American Institute of Steel Construction prize for "Most Beautiful." Survey number: HAER IL-48 Building/structure dates: 1930 Initial Construction

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Survey number: HAER MT-27 Building/structure dates: 1913 Initial Construction Building/structure dates: 1925 Subsequent Work

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Survey number: HAER MT-27 Building/structure dates: 1913 Initial Construction Building/structure dates: 1925 Subsequent Work

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Survey number: HAER MT-27 Building/structure dates: 1913 Initial Construction Building/structure dates: 1925 Subsequent Work

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT

Survey number: HAER MT-27 Building/structure dates: 1913 Initial Construction Building/structure dates: 1925 Subsequent Work

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL

Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More

South High Street Bridge, South High Street, spanning Little Juniata Creek, Duncannon, Perry County, PA

South High Street Bridge, South High Street, spanning Little Juniata C...

Significance: The South High Street Bridge is one of four surviving lenticular truss bridges in the Commonwealth of Pennsylvania and one of fifty remaining in the United States. The truss derives its name from... More

Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 210.52, Tehama, Tehama County, CA

Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 21...

Significance: The Southern Pacific Railroad Shasta Route, built as the California and Oregon Railroad and the Central Pacific Railroad between Roseville, California and Portland, Oregon was the first thrust nor... More

Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 210.52, Tehama, Tehama County, CA

Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 21...

Significance: The Southern Pacific Railroad Shasta Route, built as the California and Oregon Railroad and the Central Pacific Railroad between Roseville, California and Portland, Oregon was the first thrust nor... More

Chicago & Alton Railroad Bridge, Spanning South Branch of Chicago River, Chicago, Cook County, IL

Chicago & Alton Railroad Bridge, Spanning South Branch of Chicago Rive...

Significance: The Chicago & Alton Railroad bridge was the first Page bascule erected for railroad use. Patented by John W. Page, a Chicago engineer, the Page bascule was not as extensively built as other paten... 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

Susquehanna River Bridge, Spanning Susquehanna River, Havre de Grace, Harford County, MD

Susquehanna River Bridge, Spanning Susquehanna River, Havre de Grace, ...

Significance: The Susquehanna River Bridge was constructed in 1908 to replace an older, timber Howe truss structure. The first bridge built by the B&O Railroad on this site consisted of twelve 250 foot spans, ... More

Susquehanna River Bridge, Spanning Susquehanna River, Havre de Grace, Harford County, MD

Susquehanna River Bridge, Spanning Susquehanna River, Havre de Grace, ...

Significance: The Susquehanna River Bridge was constructed in 1908 to replace an older, timber Howe truss structure. The first bridge built by the B&O Railroad on this site consisted of twelve 250 foot spans, ... More

Susquehanna River Bridge, Spanning Susquehanna River, Havre de Grace, Harford County, MD

Susquehanna River Bridge, Spanning Susquehanna River, Havre de Grace, ...

Significance: The Susquehanna River Bridge was constructed in 1908 to replace an older, timber Howe truss structure. The first bridge built by the B&O Railroad on this site consisted of twelve 250 foot spans, ... More

South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity River, Salyer, Trinity County, CA

South Fork Trinity River Bridge, State Highway 299 spanning South Fork...

Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More

South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity River, Salyer, Trinity County, CA

South Fork Trinity River Bridge, State Highway 299 spanning South Fork...

Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More

South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity River, Salyer, Trinity County, CA

South Fork Trinity River Bridge, State Highway 299 spanning South Fork...

Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More

South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity River, Salyer, Trinity County, CA

South Fork Trinity River Bridge, State Highway 299 spanning South Fork...

Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More

South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity River, Salyer, Trinity County, CA

South Fork Trinity River Bridge, State Highway 299 spanning South Fork...

Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More

South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity River, Salyer, Trinity County, CA

South Fork Trinity River Bridge, State Highway 299 spanning South Fork...

Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New Castle County, DE

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...

Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New Castle County, DE

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...

Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New Castle County, DE

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...

Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New Castle County, DE

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...

Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New Castle County, DE

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...

Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New Castle County, DE

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...

Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New Castle County, DE

Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...

Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More

Ross Island Bridge, Spanning Willamette River at Powell Boulevard, Portland, Multnomah County, OR

Ross Island Bridge, Spanning Willamette River at Powell Boulevard, Por...

Significance: The Ross Island Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River. It is one of five Portland spans (with Burnside, Sellwood, Lovejoy Viaduct, an... More

Ross Island Bridge, Spanning Willamette River at Powell Boulevard, Portland, Multnomah County, OR

Ross Island Bridge, Spanning Willamette River at Powell Boulevard, Por...

Significance: The Ross Island Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River. It is one of five Portland spans (with Burnside, Sellwood, Lovejoy Viaduct, an... More

Southern Railway Company, Spencer Shops, Salisbury Avenue between Third and Eight Streets, Spencer, Rowan County, NC

Southern Railway Company, Spencer Shops, Salisbury Avenue between Thir...

Significance: The Spencer Shops served as the largest maintenance and repair facility in the Southern Railway Company system. The extant structures provide important indications of the requirements of large sc... More

Southern Railway Company, Spencer Shops, Salisbury Avenue between Third and Eight Streets, Spencer, Rowan County, NC

Southern Railway Company, Spencer Shops, Salisbury Avenue between Thir...

Significance: The Spencer Shops served as the largest maintenance and repair facility in the Southern Railway Company system. The extant structures provide important indications of the requirements of large sc... More

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile downstream from confluence of Monongahela & Allegheny rivers, Pittsburgh, Allegheny County, PA

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile ...

Photographs cover approach spans only; Ohio River span not shown. Significance: After two decades of agitation by the local business community, the West End-North Side Bridge was completed in 1932 by the Americ... More

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile downstream from confluence of Monongahela & Allegheny rivers, Pittsburgh, Allegheny County, PA

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile ...

Photographs cover approach spans only; Ohio River span not shown. Significance: After two decades of agitation by the local business community, the West End-North Side Bridge was completed in 1932 by the Americ... More

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile downstream from confluence of Monongahela & Allegheny rivers, Pittsburgh, Allegheny County, PA

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile ...

Photographs cover approach spans only; Ohio River span not shown. Significance: After two decades of agitation by the local business community, the West End-North Side Bridge was completed in 1932 by the Americ... More

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile downstream from confluence of Monongahela & Allegheny rivers, Pittsburgh, Allegheny County, PA

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile ...

Photographs cover approach spans only; Ohio River span not shown. Significance: After two decades of agitation by the local business community, the West End-North Side Bridge was completed in 1932 by the Americ... More

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile downstream from confluence of Monongahela & Allegheny rivers, Pittsburgh, Allegheny County, PA

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile ...

Photographs cover approach spans only; Ohio River span not shown. Significance: After two decades of agitation by the local business community, the West End-North Side Bridge was completed in 1932 by the Americ... More

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile downstream from confluence of Monongahela & Allegheny rivers, Pittsburgh, Allegheny County, PA

West End-North Side Bridge, Spanning Ohio River, approximately 1 mile ...

Photographs cover approach spans only; Ohio River span not shown. Significance: After two decades of agitation by the local business community, the West End-North Side Bridge was completed in 1932 by the Americ... More

Monongahela Connecting Railroad Company, Main Bridge, Spanning Monongahela River at mile post 3.1, Pittsburgh, Allegheny County, PA

Monongahela Connecting Railroad Company, Main Bridge, Spanning Mononga...

Significance: Major connection between the north and south sides of the plant which was separated by the Monongahela River. Practically all of the intra-mill transfer of materials crossed this bridge during th... More

Salinas River Bridge, Spanning Salinas River on Chualar River Road, Chualar, Monterey County, CA

Salinas River Bridge, Spanning Salinas River on Chualar River Road, Ch...

Significance: The Salinas River Bridge on Chualar River Road is an eight-span, pin-connected Pratt through truss bridge. As such, it is the largest multiple-span through truss bridge, particularly of its perio... More

Salinas River Bridge, Spanning Salinas River on Chualar River Road, Chualar, Monterey County, CA

Salinas River Bridge, Spanning Salinas River on Chualar River Road, Ch...

Significance: The Salinas River Bridge on Chualar River Road is an eight-span, pin-connected Pratt through truss bridge. As such, it is the largest multiple-span through truss bridge, particularly of its perio... More

Center Street Bridge, Spanning Conneat Creek, Conneautville, Crawford County, PA

Center Street Bridge, Spanning Conneat Creek, Conneautville, Crawford ...

Significance: Center Street Bridge is an unusually ornate example of a late-nineteenth century, pin-connected Pratt through truss roadway bridge. It is one of four surviving Crawford County bridges built by th... More

Bush Terminal Company, Pier 7, End of Forty-first Street on Upper New York Bay, Brooklyn, Kings County, NY

Bush Terminal Company, Pier 7, End of Forty-first Street on Upper New ...

Significance: Pier 7 was one of the two earliest piers at Bush Terminal, dating from the 1880s, and was the first to be completely rebuilt by Irving Bush with a piershed. It survives partly intact, and has the... More

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau, Trempealeau County, WI

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...

Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau, Trempealeau County, WI

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...

Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau, Trempealeau County, WI

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...

Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau, Trempealeau County, WI

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...

Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau, Trempealeau County, WI

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...

Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau, Trempealeau County, WI

Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...

Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More

State Bridge, Spanning Rio Grande River, Del Norte, Rio Grande County, CO

State Bridge, Spanning Rio Grande River, Del Norte, Rio Grande County,...

Survey number: HAER CO-36 Building/structure dates: 1908 Initial Construction Building/structure dates: ca. 1928 Subsequent Work

Penobscot Bridge, Spanning Penobscot River at Route 15, Bangor, Penobscot County, ME

Penobscot Bridge, Spanning Penobscot River at Route 15, Bangor, Penobs...

Significance: This bridge is the last remaining Baltimore (Petit) through-truss bridge in the state. The current structure represents three different phases of construction: Phase 1 - the center span was erec... More

Penobscot Bridge, Spanning Penobscot River at Route 15, Bangor, Penobscot County, ME

Penobscot Bridge, Spanning Penobscot River at Route 15, Bangor, Penobs...

Significance: This bridge is the last remaining Baltimore (Petit) through-truss bridge in the state. The current structure represents three different phases of construction: Phase 1 - the center span was erec... More

Penobscot Bridge, Spanning Penobscot River at Route 15, Bangor, Penobscot County, ME

Penobscot Bridge, Spanning Penobscot River at Route 15, Bangor, Penobs...

Significance: This bridge is the last remaining Baltimore (Petit) through-truss bridge in the state. The current structure represents three different phases of construction: Phase 1 - the center span was erec... More

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Burleigh County, ND

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Bu...

Significance: The Liberty Memorial Bridge is a three-span, Warren-Turner through truss bridge, a variation of the Warren through truss designed by C.A.P. Turner. This was the first highway bridge over the Miss... More

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Burleigh County, ND

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Bu...

Significance: The Liberty Memorial Bridge is a three-span, Warren-Turner through truss bridge, a variation of the Warren through truss designed by C.A.P. Turner. This was the first highway bridge over the Miss... More

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Burleigh County, ND

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Bu...

Significance: The Liberty Memorial Bridge is a three-span, Warren-Turner through truss bridge, a variation of the Warren through truss designed by C.A.P. Turner. This was the first highway bridge over the Miss... More

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Burleigh County, ND

Liberty Memorial Bridge, Spanning Missouri River at I-94, Bismarck, Bu...

Significance: The Liberty Memorial Bridge is a three-span, Warren-Turner through truss bridge, a variation of the Warren through truss designed by C.A.P. Turner. This was the first highway bridge over the Miss... More

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