Canyon Bridge, North Rim Trail spanning Jay Creek, Lake, Teton County,...
Significance: The Canyon Bridge and its predecessor provided vehicular access to the North Rim of the Grand Canyon of the Yellowstone via the historic road alignment. Spanning often-dry Jay Creek, the bridge c... More
Lincoln Avenue Viaduct, Spanning Union Pacific Railroad between Baring...
Significance: Designed by the Missouri Pacific Railroad Company and presented to the City of Little Rock as a corporate gesture of goodwill, the Lincoln Avenue Viaduct was the first and only through rainbow arc... More
Vicksburg National Military Park Roads & Bridges, Halls Ferry Bridge, ...
Significance: Constructed over five months in 1936-1937, the Confederate Avenue bridge spanning Halls Ferry Road is the only extant bridge of its type in the state of Mississippi. The bridge was included in th... More
Baring Creek Bridge, Spanning Baring Creek at Going-to-the-Sun Road, W...
Significance: The Baring Creek Bridge is one of approximately seventeen prominent masonry and concrete structures on Going-to-the-Sun Road in Glacier National Park. The 51-mile stretch of scenic road is signif... More
Merritt Parkway, Bridge No. 744, Spanning Merritt Parkway at Route 59,...
Significance: This bridge is part of the Merritt Parkway, a landscaped limited-access highway designed and built in the 1930s. The parkway was regarded as a model in its day, largely because of the architectur... More
Merritt Parkway, Bridge No. 744, Spanning Merritt Parkway at Route 59,...
Significance: This bridge is part of the Merritt Parkway, a landscaped limited-access highway designed and built in the 1930s. The parkway was regarded as a model in its day, largely because of the architectur... More
Fourche Lafave Bridge, Spanning Fourche Lafave River at State Highway ...
Significance: The Fourch Lafave River Bridge is significant for its association with the Luten Bridge Company and the development of the Arkansas highway system in the first half of the twentieth century. It i... More
Fourche Lafave Bridge, Spanning Fourche Lafave River at State Highway ...
Significance: The Fourch Lafave River Bridge is significant for its association with the Luten Bridge Company and the development of the Arkansas highway system in the first half of the twentieth century. It i... More
Philadelphia & Reading Railroad, Susquehanna River Bridge, Spanning Su...
Significance: The structure is significant as a late example of a reinforced concrete arch design by the Philadelphia & Reading Railroad, and perhaps the longest such structure on the former P&R system. Its des... More
Big Creek Bridge, Spanning Big Creek on Oregon Coast Highway (US101), ...
Significance: The Big Creek Bridge is significant as one of the earliest examples of reinforced concrete tied-arch bridge construction in the Pacific Northwest region of the United States. The Big Creek Bridge... More
Philadelphia & Reading Railroad, Manatawny Creek Bridge, Spanning Mana...
Significance: The bridge is typical of dozens of stone arch bridges built along the Philadelphia & Reading Railroad during the mid-19th century. This particular example demonstrates how the railroad used reinfo... More
Hayden Arch Bridge, Spanning Shoshone River on Old U. S. 14/16, Cody, ...
Significance: The Hayden Arch Bridge is Wyoming's only medium span concrete arch vehicular bridge and,as such, is one of the State's most significant vehicular bridges. Survey number: HAER WY-81 Building/stru... More
Rock Point Arch Bridge, Spanning Rogue River & Old Pacific Highway, Ro...
Significance: The Rock Point Arch Bridge was the first reinforced-concrete bridge that Conde B. McCullough designed for the Oregon State Highway Department after he became the State Bridge Engineer in the sprin... More
Soda Butte Creek Bridge No. 1, Spans Soda Butte Creek at Northeast Ent...
Significance: Soda Butte 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. Th... More
Santiam River Bridge, Spans Santiam River at State Route 164, Jefferso...
Significance: The Santiam River Bridge is a prime example of C.B. McCullough's application of the Art Deco style that he preferred to use in embellishing reinforced-concrete arch bridges in the 1930s. Unproces... More
Santiam River Bridge, Spans Santiam River at State Route 164, Jefferso...
Significance: The Santiam River Bridge is a prime example of C.B. McCullough's application of the Art Deco style that he preferred to use in embellishing reinforced-concrete arch bridges in the 1930s. Unproces... More
Twenty-Four Mile Road Overflow Bridge, Spanning North Branch of Clinto...
Picryl description: Public domain image of a bridge over a water stream, free to use, no copyright restrictions.
Stoneman Bridge, Spanning Merced River on Stoneman Crossover Road, Yos...
part of Yosemite National Park Roads and Bridges Recording Project, 1991; see HAER No. CA-117 for overview Significance: The Stoneman Bridge was the last of seven stone-faced reinforced concrete spandrel arch b... More
Stoneman Bridge, Spanning Merced River on Stoneman Crossover Road, Yos...
part of Yosemite National Park Roads and Bridges Recording Project, 1991; see HAER No. CA-117 for overview Significance: The Stoneman Bridge was the last of seven stone-faced reinforced concrete spandrel arch b... More
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
Pine Street Bridge, Pine Street (State Route 66) ,spanning Cumberland ...
Significance: The bridge derives its significance from its representative nature as an open spandrel deck concrete arch bridge and from its associations with the Luten Bridge Company and the historic Cumberland... More
Bridalveil Fall Bridge No. 2, Spanning Bridalveil Creek on carriage ro...
part of Yosemite National Park Roads and Bridges Recording Project, 1991; see HAER No. CA-117 for overview Significance: The three Bridalveil Fall bridges are the only surviving road bridges in the park dating ... More
Merritt Parkway, Lapham Avenue Bridge, Spanning Merritt Parkway at Sta...
Significance: This bridge is one of 25 different style bridges located along a 38-mile stretch of the Merritt Parkway that includes bridges of French, Italian, English, or Classic Art Deco styles. These bridge... More
Merritt Parkway, Lapham Avenue Bridge, Spanning Merritt Parkway at Sta...
Significance: This bridge is one of 25 different style bridges located along a 38-mile stretch of the Merritt Parkway that includes bridges of French, Italian, English, or Classic Art Deco styles. These bridge... More
Pope Memorial Bridge, Spanning East Machias River at U.S. Route 1, Eas...
Significance: The Pope Memorial Bridge is the fourth bridge in this location to cross the East Machias River, and the first to be constructed of reinforced concrete. The structure is a critical component of U.... More
Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memo...
Significance: As the final link in the chain of monuments which start at the Capitol building, the Arlington Memorial Bridge connects the Mall in Washington, DC with Arlington National Cemetery in Virginia. De... More
Highland Boulevard Viaduct, Spanning Railroad Tracks on West Highland ...
Significance: The two-span reinforced concrete, arch bridge was designed by the well-known engineer, Claude A.P. Turner. The Neoclassical bridge allowed the extension of Highland Boulevard, one of the city's m... More
Third Avenue Bridge, Spanning Olentangy River of West Third Avenue, Co...
Significance: The 1913 flood destroyed or damaged many bridges and buildings along the riverfront in Columbus. While the West Third Avenue Bridge was not among those that were, it was replaced as a result of t... More
Wilson River Bridge, Spans Wilson River at U.S. Highway 101, Tillamook...
Significance: The Wilson River Bridge at Tillamook is the first reinforced-concrete tied-arch span built in the Pacific Northwest region of the United States. In the 1910s, its designer, Conde B. McCullough, w... More
Wilson River Bridge, Spans Wilson River at U.S. Highway 101, Tillamook...
Significance: The Wilson River Bridge at Tillamook is the first reinforced-concrete tied-arch span built in the Pacific Northwest region of the United States. In the 1910s, its designer, Conde B. McCullough, w... More
South Bridge, Spanning Quarton Lake branch of River Rouge, Birmingham,...
Survey number: HAER MI-79 Public domain photograph - historical image of Michigan, United States, free to use, no copyright restrictions image - Picryl description
Cohas Brook Bridge, Spanning Cohas Brook, Highway 28 (South Willow Str...
Significance: The bridge is significant as the first example of an open spandrel, reinforced concrete, parabolic arch bridge erected in New Hampshire, and one of only three, apparently, in the state. The struct... More
Sugar Pine Bridge, Spanning Merced River on service road, Yosemite Vil...
part of Yosemite National Park Roads and Bridges Recording Project, 1991; see HAER No. CA-117 for overview Significance: The National Park Service replaced bridges in Yosemite Valley with a series of rustic st... More
Sugar Pine Bridge, Spanning Merced River on service road, Yosemite Vil...
part of Yosemite National Park Roads and Bridges Recording Project, 1991; see HAER No. CA-117 for overview Significance: The National Park Service replaced bridges in Yosemite Valley with a series of rustic st... More
Duck Brook Bridge, Spanning Duck Brook between Witch Hole Loop & New E...
Picryl description: Public domain image of an arch bridge, stone structure, architecture, free to use, no copyright restrictions.
Main Street Bridge, Spanning Israels River, Lancaster, Coos County, NH
Significance: The bridge is one of approximately 40 concrete arch bridges extant in New Hampshire. It is one of 11 extant bridges built by Daniel B. Luten in New Hampshire between 1927-1931. Constructed in 1929... More
Mott Rainbow Arch Bridge, Spanning Cannonball River, Mott, Hettinger C...
Significance: This structure is one of only two reinforced concrete bridges known to exist in North Dakota in 1980. It is a good representative of the Marsh Rainbow Arch Bridge design. Survey number: HAER ND-... More
Mott Rainbow Arch Bridge, Spanning Cannonball River, Mott, Hettinger C...
Significance: This structure is one of only two reinforced concrete bridges known to exist in North Dakota in 1980. It is a good representative of the Marsh Rainbow Arch Bridge design. Survey number: HAER ND-... More
Virginia Street Bridge, Spanning Truckee River at Virginia Street, Ren...
Significance: The Virginia Street Bridge, built in 1905, is the oldest functioning bridge in Reno and was the first reinforced concrete bridge in the State of Nevada. It is listed on the National Register of H... More
Virginia Street Bridge, Spanning Truckee River at Virginia Street, Ren...
Significance: The Virginia Street Bridge, built in 1905, is the oldest functioning bridge in Reno and was the first reinforced concrete bridge in the State of Nevada. It is listed on the National Register of H... More
Chestoa Bridge, County Road spanning Nolichucky River, Chestoa, Unicoi...
Significance: The Chestoa Bridge is a representative example of the filled concrete (closed spandrel) arch bridge and of the work of the Luten Bridge Company. Survey number: HAER TN-25 Building/structure date... More
North Avenue Viaduct, Spanning Milwaukee River & Chicago, Milwaukee & ...
Significance: The North Avenue Viaduct is one of Milwaukee's largest spans. Designed by J.C. Pinney, the reinforced concrete bridge employs a complex open spandrel, ribbed arch support system. The structure o... More
Broad Street Bridge, Spanning Scioto River at U.S. Route 40 (Broad Str...
Significance: The Broad Street Bridge is significant because it is one of three integral parts of the riverfront reconstruction after the 1913 flood, the Town Street Bridge and flood wall are the other two part... More
Broad Street Bridge, Spanning Scioto River at U.S. Route 40 (Broad Str...
Significance: The Broad Street Bridge is significant because it is one of three integral parts of the riverfront reconstruction after the 1913 flood, the Town Street Bridge and flood wall are the other two part... More
Shiawassee Street Bridge, Spanning Grand River, Lansing, Ingham County...
Significance: The primary unique qualities of this bridge are associated with the integration of three basic design types within one structure, which originally blended in with the surrounding architecture and ... More
Shiawassee Street Bridge, Spanning Grand River, Lansing, Ingham County...
Significance: The primary unique qualities of this bridge are associated with the integration of three basic design types within one structure, which originally blended in with the surrounding architecture and ... More
Connecticut Avenue Bridge, Spans Rock Creek & Potomac Parkway at Conne...
Significance: Designed by prominent engineer George B. Morison, Connecticut Avenue Bridge was described at the time of its construction as the largest concrete arch in the world. This seven-arch span was erect... More
Connecticut Avenue Bridge, Spans Rock Creek & Potomac Parkway at Conne...
Significance: Designed by prominent engineer George B. Morison, Connecticut Avenue Bridge was described at the time of its construction as the largest concrete arch in the world. This seven-arch span was erect... More
Parks Bar Bridge, Spanning Yuba River at State Highway 20, Smartville,...
Significance: The Parks Bar Bridge is significant under Criterion C, as a distinctive example of an unusual method of construction. It is one of the earliest and largest remaining examples of the Thomas System... More
Parks Bar Bridge, Spanning Yuba River at State Highway 20, Smartville,...
Significance: The Parks Bar Bridge is significant under Criterion C, as a distinctive example of an unusual method of construction. It is one of the earliest and largest remaining examples of the Thomas System... More
Parks Bar Bridge, Spanning Yuba River at State Highway 20, Smartville,...
Significance: The Parks Bar Bridge is significant under Criterion C, as a distinctive example of an unusual method of construction. It is one of the earliest and largest remaining examples of the Thomas System... More
Parks Bar Bridge, Spanning Yuba River at State Highway 20, Smartville,...
Significance: The Parks Bar Bridge is significant under Criterion C, as a distinctive example of an unusual method of construction. It is one of the earliest and largest remaining examples of the Thomas System... More
Bridge at Mouth of Rogue River, Spanning Rogue River on Oregon Coast H...
Significance: The bridge is the first reinforced-concrete arch span built in the U.S. using the Freyssinet method of arch decentering. In this technique, arch ribs are pre-stressed by hydraulic jacks placed at ... More
Bridge at Mouth of Rogue River, Spanning Rogue River on Oregon Coast H...
Significance: The bridge is the first reinforced-concrete arch span built in the U.S. using the Freyssinet method of arch decentering. In this technique, arch ribs are pre-stressed by hydraulic jacks placed at ... More
Bridge at Mouth of Rogue River, Spanning Rogue River on Oregon Coast H...
Significance: The bridge is the first reinforced-concrete arch span built in the U.S. using the Freyssinet method of arch decentering. In this technique, arch ribs are pre-stressed by hydraulic jacks placed at ... More
Main Street Bridge, Spanning East Fork Whitewater River, Richmond, Way...
Significance: It is an open-spandrel arch type of construction. It is the oldest and one of the longest in Indiana. This type of construction was very expensive and of the couple of dozen built in Indiana, only... More
Main Street Bridge, Spanning East Fork Whitewater River, Richmond, Way...
Significance: It is an open-spandrel arch type of construction. It is the oldest and one of the longest in Indiana. This type of construction was very expensive and of the couple of dozen built in Indiana, only... More
Main Street Bridge, Spanning East Fork Whitewater River, Richmond, Way...
Significance: It is an open-spandrel arch type of construction. It is the oldest and one of the longest in Indiana. This type of construction was very expensive and of the couple of dozen built in Indiana, only... More
Ashtabula Viaduct, Spanning Ashtabula River at U.S. Route 20 (Prospect...
Significance: This concrete, open spandrel rib arch viaduct is of engineering significance for its outstanding design feature of a complete separation of the superstructures at the end of each span using only a... More
County Line Bridge, Spanning St. Joseph River at State Route 219, 0.6 ...
Significance: The County Line Bridge, in the vicinity of Osceola, Elkhart County, is significant as an example of early 20th century reinforced concrete bridge design and construction. It utilizes known design... More
County Line Bridge, Spanning St. Joseph River at State Route 219, 0.6 ...
Significance: The County Line Bridge, in the vicinity of Osceola, Elkhart County, is significant as an example of early 20th century reinforced concrete bridge design and construction. It utilizes known design... More
County Line Bridge, Spanning St. Joseph River at State Route 219, 0.6 ...
Significance: The County Line Bridge, in the vicinity of Osceola, Elkhart County, is significant as an example of early 20th century reinforced concrete bridge design and construction. It utilizes known design... More
First Street Bridge, Spanning Los Angeles River at First Street, Los A...
Significance: First Street Bridge is a Neo-Classical design bridge and is one of the City of Los Angeles bridges that was built as part of the City Beautiful plans of the early 1900s. City Beautiful plans were... More
First Street Bridge, Spanning Los Angeles River at First Street, Los A...
Significance: First Street Bridge is a Neo-Classical design bridge and is one of the City of Los Angeles bridges that was built as part of the City Beautiful plans of the early 1900s. City Beautiful plans were... More
First Street Bridge, Spanning Los Angeles River at First Street, Los A...
Significance: First Street Bridge is a Neo-Classical design bridge and is one of the City of Los Angeles bridges that was built as part of the City Beautiful plans of the early 1900s. City Beautiful plans were... More
First Street Bridge, Spanning Los Angeles River at First Street, Los A...
Significance: First Street Bridge is a Neo-Classical design bridge and is one of the City of Los Angeles bridges that was built as part of the City Beautiful plans of the early 1900s. City Beautiful plans were... More
Alsea Bay Bridge, Spanning Alsea Bay at Oregon Coast Highway, Waldport...
Significance: The Alsea Bay Bridge was one of five large spans built along the Oregon Coast Highway between 1934 and 1936, of which C.B. McCullough oversaw the design and construction. The main spans of this 3... More
Alsea Bay Bridge, Spanning Alsea Bay at Oregon Coast Highway, Waldport...
Significance: The Alsea Bay Bridge was one of five large spans built along the Oregon Coast Highway between 1934 and 1936, of which C.B. McCullough oversaw the design and construction. The main spans of this 3... More
Alsea Bay Bridge, Spanning Alsea Bay at Oregon Coast Highway, Waldport...
Significance: The Alsea Bay Bridge was one of five large spans built along the Oregon Coast Highway between 1934 and 1936, of which C.B. McCullough oversaw the design and construction. The main spans of this 3... More
Alsea Bay Bridge, Spanning Alsea Bay at Oregon Coast Highway, Waldport...
Significance: The Alsea Bay Bridge was one of five large spans built along the Oregon Coast Highway between 1934 and 1936, of which C.B. McCullough oversaw the design and construction. The main spans of this 3... More
Alsea Bay Bridge, Spanning Alsea Bay at Oregon Coast Highway, Waldport...
Significance: The Alsea Bay Bridge was one of five large spans built along the Oregon Coast Highway between 1934 and 1936, of which C.B. McCullough oversaw the design and construction. The main spans of this 3... More
Alsea Bay Bridge, Spanning Alsea Bay at Oregon Coast Highway, Waldport...
Significance: The Alsea Bay Bridge was one of five large spans built along the Oregon Coast Highway between 1934 and 1936, of which C.B. McCullough oversaw the design and construction. The main spans of this 3... More
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph of a river with a town on a background, reflection in the water, free to use, no copyright restrictions image - Picryl description
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph of ship dock, embarkment, free to use, no copyright restrictions image - Picryl description
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph - city, downtown, New York, United States, free to use, no copyright restrictions image - Picryl description
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph - city, downtown, New York, United States, free to use, no copyright restrictions image - Picryl description
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description
Northeast Railroad Corridor, Amtrak Route between New York/Connecticut...
Survey number: HAER CT-11 Public domain photograph - New York, United States, free to use, no copyright restrictions image - Picryl description
Penns Creek Bridge, State Route 1014 at Penns Creek, Selinsgrove, Snyd...
Significance: Penns Creek Bridge is an unusually ornamented example of a multiple-span concrete barrel arch bridge. Parapet walls follow the graceful humpback curve of the bridge and employ a molded concrete s... More
Penns Creek Bridge, State Route 1014 at Penns Creek, Selinsgrove, Snyd...
Significance: Penns Creek Bridge is an unusually ornamented example of a multiple-span concrete barrel arch bridge. Parapet walls follow the graceful humpback curve of the bridge and employ a molded concrete s... More
Penns Creek Bridge, State Route 1014 at Penns Creek, Selinsgrove, Snyd...
Significance: Penns Creek Bridge is an unusually ornamented example of a multiple-span concrete barrel arch bridge. Parapet walls follow the graceful humpback curve of the bridge and employ a molded concrete s... More
Rapids Footbridge, Spanning Rock Creek .7 Mile South of Joyce Road Nor...
Significance: Rapids Footbridge was one of eight bridges constructed in 1934 with the Fine Arts Commission's approval. It is a concrete arch bridge with stone abutments and wooden railings in keeping with the ... More
Rapids Footbridge, Spanning Rock Creek .7 Mile South of Joyce Road Nor...
Significance: Rapids Footbridge was one of eight bridges constructed in 1934 with the Fine Arts Commission's approval. It is a concrete arch bridge with stone abutments and wooden railings in keeping with the ... More
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
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Public domain photograph - historical image of Hawaii, United States, free to use, no copyright restrictions image - Picryl description
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Public domain photograph - historical image of Hawaii, United States, free to use, no copyright restrictions image - Picryl description
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Public domain photograph - historical image of Hawaii, United States, free to use, no copyright restrictions image - Picryl description
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Public domain photograph - historical image of Hawaii, United States, free to use, no copyright restrictions image - Picryl description
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Picryl description: Public domain image of a bridge, water, historic structure, free to use, no copyright restrictions.
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Picryl description: Public domain image of a park, trees, outdoors, free to use, no copyright restrictions.
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Picryl description: Public domain image of a park, trees, outdoors, free to use, no copyright restrictions.
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Public domain photograph - historical image of Hawaii, United States, free to use, no copyright restrictions image - Picryl description
Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI
Public domain image of wetland, water, free to use, no copyright restrictions image - Picryl description
North Bridge, Spanning Quarton Lake branch of River Rouge, Birmingham,...
Survey number: HAER MI-78 Public domain photograph - historical image of Michigan, United States, free to use, no copyright restrictions image - Picryl description
Buffalo River Bridge, Spanning Buffalo River on U.S. Highway 65, Marsh...
Significance: The Buffalo River Bridge was the first major bridge to span the Buffalo River in north central Arkansas. It is one of the few specimens of the open spandrel concrete deck arch bridge type remaini... More
Buffalo River Bridge, Spanning Buffalo River on U.S. Highway 65, Marsh...
Significance: The Buffalo River Bridge was the first major bridge to span the Buffalo River in north central Arkansas. It is one of the few specimens of the open spandrel concrete deck arch bridge type remaini... More
Route 233 Bridge, Spanning Route 233 on Paradise Hill Road, Bar Harbor...
Significance: This structure provides a grade separation between the Paradise Hill Road and Maine Route 233, giving park visitors unimpeded access to the Park Loop Road without having to pass through the conges... More