U.S. Naval Base, Pearl Harbor, Post Office, Pearl Harbor Boulevard nea...
This structure was moved to its current location in 1945. (5/14/03, KEY) Significance: The Naval Base at Pearl Harbor was designated as a National Historic Landmark in 1964, due to the crucial role it played in... More
Sellwood Bridge, Spanning Willamette River at Southeast Tacoma Street,...
Significance: The Sellwood Bridge, the busiest two-lane bridge in Oregon, is the southern-most span in an ensemble of twelve monumental highway bridges across the lower Willamette River at Portland, Oregon. Th... More
Sellwood Bridge, Spanning Willamette River at Southeast Tacoma Street,...
Significance: The Sellwood Bridge, the busiest two-lane bridge in Oregon, is the southern-most span in an ensemble of twelve monumental highway bridges across the lower Willamette River at Portland, Oregon. Th... More
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
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a bridge, water, historic structure, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Public domain photograph of a tall building, skyscraper, free to use, no copyright restrictions image - Picryl description
Office Bridge, Spanning North Fork of Middle Fork Willamette River, Ol...
Significance: Built in 1944 to provide access to the Westfir Lumber Company mill site, Office Bridge is the largest covered bridge in Oregon and a significant artifact of the state's lumber industry. It is one... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Hawthorne Bridge, Spanning Willamette River at Hawthorne Boulevard & M...
Significance: The Hawthorne Bridge is the oldest extant vertical lift bridge in the United States. It is the oldest of Portland's Willamette bridges, initiating the replacement of earlier swing spans. Designed ... More
St. John's Bridge, Spans Willamette River at US Highway 30, Portland, ...
Significance: The St. John's Bridge is significant for its design and for its representation among suspension bridges in the Trans-Mississippi West and in Oregon. At the time of its completion, the bridge had ... More
St. John's Bridge, Spans Willamette River at US Highway 30, Portland, ...
Significance: The St. John's Bridge is significant for its design and for its representation among suspension bridges in the Trans-Mississippi West and in Oregon. At the time of its completion, the bridge had ... More
St. John's Bridge, Spans Willamette River at US Highway 30, Portland, ...
Significance: The St. John's Bridge is significant for its design and for its representation among suspension bridges in the Trans-Mississippi West and in Oregon. At the time of its completion, the bridge had ... More
Log raft in Willamette River at Portland, Oregon
Public domain photograph of the United States military and military-industrial complex before World War Two, 1930s, free to use, no copyright restrictions image - Picryl description
Willamette National Forest, Lane County, Oregon. McKenzie River, a fam...
Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
Burnside Bridge, Spanning Willamette River at Burnside Street, Portlan...
Significance: Burnside Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River, and one of five Portland span bridges (with Ross Island Bridge, Sellwood Bridge, Lovej... More
Bolton Store, 21420 Willamette Drive, West Linn, Clackamas County, OR
Survey number: HABS OR-170 Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
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
U.S. Naval Base, Pearl Harbor, Post Office, Pearl Harbor Boulevard nea...
This structure was moved to its current location in 1945. (5/14/03, KEY) Significance: The Naval Base at Pearl Harbor was designated as a National Historic Landmark in 1964, due to the crucial role it played in... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Sellwood Bridge, Spanning Willamette River at Southeast Tacoma Street,...
Significance: The Sellwood Bridge, the busiest two-lane bridge in Oregon, is the southern-most span in an ensemble of twelve monumental highway bridges across the lower Willamette River at Portland, Oregon. Th... More
Sellwood Bridge, Spanning Willamette River at Southeast Tacoma Street,...
Significance: The Sellwood Bridge, the busiest two-lane bridge in Oregon, is the southern-most span in an ensemble of twelve monumental highway bridges across the lower Willamette River at Portland, Oregon. Th... More
Sellwood Bridge, Spanning Willamette River at Southeast Tacoma Street,...
Significance: The Sellwood Bridge, the busiest two-lane bridge in Oregon, is the southern-most span in an ensemble of twelve monumental highway bridges across the lower Willamette River at Portland, Oregon. Th... More
Marquam Bridge, Spanning Willamette River at Interstate Highway 5, Por...
Significance: The Marquam Bridge is distinctive as the first Portland span constructed to serve the Interstate freeway system, as well as the first double deck freeway bridge in the state. The structure's func... More
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, 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
Willamette Falls Lock Chamber No.1, Willamette River, West Linn, Clack...
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of park architecture, palace, chateau, open space, 18th, and 19th-century architecture, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
Office Bridge, Spanning North Fork of Middle Fork Willamette River, Ol...
Significance: Built in 1944 to provide access to the Westfir Lumber Company mill site, Office Bridge is the largest covered bridge in Oregon and a significant artifact of the state's lumber industry. It is one... More
Office Bridge, Spanning North Fork of Middle Fork Willamette River, Ol...
Significance: Built in 1944 to provide access to the Westfir Lumber Company mill site, Office Bridge is the largest covered bridge in Oregon and a significant artifact of the state's lumber industry. It is one... More
Office Bridge, Spanning North Fork of Middle Fork Willamette River, Ol...
Significance: Built in 1944 to provide access to the Westfir Lumber Company mill site, Office Bridge is the largest covered bridge in Oregon and a significant artifact of the state's lumber industry. It is one... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Willamette National Forest, Lane County, Oregon. Mountain stream and h...
Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description
Willamette National Forest, Lane County, Oregon. Wooded mountainside
Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
Willamette National Forest, Lane County, Oregon. Outdoor fireplace bui...
Picryl description: Public domain image of food, dinner, grocery store, eating, 1930s, mid-20th-century United States, free to use, no copyright restrictions.
Burnside Bridge, Spanning Willamette River at Burnside Street, Portlan...
Significance: Burnside Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River, and one of five Portland span bridges (with Ross Island Bridge, Sellwood Bridge, Lovej... More
Burnside Bridge, Spanning Willamette River at Burnside Street, Portlan...
Significance: Burnside Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River, and one of five Portland span bridges (with Ross Island Bridge, Sellwood Bridge, Lovej... More
Burnside Bridge, Spanning Willamette River at Burnside Street, Portlan...
Significance: Burnside Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River, and one of five Portland span bridges (with Ross Island Bridge, Sellwood Bridge, Lovej... More
Burnside Bridge, Spanning Willamette River at Burnside Street, Portlan...
Significance: Burnside Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River, and one of five Portland span bridges (with Ross Island Bridge, Sellwood Bridge, Lovej... More
Burnside Bridge, Spanning Willamette River at Burnside Street, Portlan...
Significance: Burnside Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River, and one of five Portland span bridges (with Ross Island Bridge, Sellwood Bridge, Lovej... More
Portland & Southwestern Railroad Tunnel, Willamette Meridian, Chapman,...
Significance: The Portland and Southwestern Railroad Tunnel is one of the longer semi-temporary railroad tunnels built for logging transport in Oregon and the only tunnel to cross the divide of the Oregon coast... More
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
U.S. Naval Base, Pearl Harbor, Post Office, Pearl Harbor Boulevard nea...
This structure was moved to its current location in 1945. (5/14/03, KEY) Significance: The Naval Base at Pearl Harbor was designated as a National Historic Landmark in 1964, due to the crucial role it played in... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Sellwood Bridge, Spanning Willamette River at Southeast Tacoma Street,...
Significance: The Sellwood Bridge, the busiest two-lane bridge in Oregon, is the southern-most span in an ensemble of twelve monumental highway bridges across the lower Willamette River at Portland, Oregon. Th... More
Marquam Bridge, Spanning Willamette River at Interstate Highway 5, Por...
Significance: The Marquam Bridge is distinctive as the first Portland span constructed to serve the Interstate freeway system, as well as the first double deck freeway bridge in the state. The structure's func... More
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, 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
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a river, water stream, lake or pond, park or forest, natural landscape, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a bridge over a water stream, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a bridge, water, historic structure, free to use, no copyright restrictions.
Office Bridge, Spanning North Fork of Middle Fork Willamette River, Ol...
Significance: Built in 1944 to provide access to the Westfir Lumber Company mill site, Office Bridge is the largest covered bridge in Oregon and a significant artifact of the state's lumber industry. It is one... More
Albany Bridge, Spanning Willamette River at U.S. Highway 20, Albany, L...
Significance: The Albany Bridge made possible the completion of the Albany-Corvallis Highway. It is one of only a few multiple-span steel truss bridges in Oregon. It is also one of the few major steel truss b... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Hawthorne Bridge, Spanning Willamette River at Hawthorne Boulevard & M...
Significance: The Hawthorne Bridge is the oldest extant vertical lift bridge in the United States. It is the oldest of Portland's Willamette bridges, initiating the replacement of earlier swing spans. Designed ... More
Hawthorne Bridge, Spanning Willamette River at Hawthorne Boulevard & M...
Significance: The Hawthorne Bridge is the oldest extant vertical lift bridge in the United States. It is the oldest of Portland's Willamette bridges, initiating the replacement of earlier swing spans. Designed ... More
St. John's Bridge, Spans Willamette River at US Highway 30, Portland, ...
Significance: The St. John's Bridge is significant for its design and for its representation among suspension bridges in the Trans-Mississippi West and in Oregon. At the time of its completion, the bridge had ... More
St. John's Bridge, Spans Willamette River at US Highway 30, Portland, ...
Significance: The St. John's Bridge is significant for its design and for its representation among suspension bridges in the Trans-Mississippi West and in Oregon. At the time of its completion, the bridge had ... More
St. John's Bridge, Spans Willamette River at US Highway 30, Portland, ...
Significance: The St. John's Bridge is significant for its design and for its representation among suspension bridges in the Trans-Mississippi West and in Oregon. At the time of its completion, the bridge had ... More
Burnside Bridge, Spanning Willamette River at Burnside Street, Portlan...
Significance: Burnside Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River, and one of five Portland span bridges (with Ross Island Bridge, Sellwood Bridge, Lovej... More
Bolton Store, 21420 Willamette Drive, West Linn, Clackamas County, OR
Survey number: HABS OR-170 Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
Bolton Store, 21420 Willamette Drive, West Linn, Clackamas County, OR
Survey number: HABS OR-170 Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
Bolton Store, 21420 Willamette Drive, West Linn, Clackamas County, OR
Survey number: HABS OR-170 Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
Portland & Southwestern Railroad Tunnel, Willamette Meridian, Chapman,...
Significance: The Portland and Southwestern Railroad Tunnel is one of the longer semi-temporary railroad tunnels built for logging transport in Oregon and the only tunnel to cross the divide of the Oregon coast... More
Portland & Southwestern Railroad Tunnel, Willamette Meridian, Chapman,...
Significance: The Portland and Southwestern Railroad Tunnel is one of the longer semi-temporary railroad tunnels built for logging transport in Oregon and the only tunnel to cross the divide of the Oregon coast... More
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
U.S. Naval Base, Pearl Harbor, Post Office, Pearl Harbor Boulevard nea...
This structure was moved to its current location in 1945. (5/14/03, KEY) Significance: The Naval Base at Pearl Harbor was designated as a National Historic Landmark in 1964, due to the crucial role it played in... More
Willamette River Bridges, Spanning Willamette River at various locatio...
Significance: The eleven Portland bridges recorded by the Willamette River Bridges Recording Project were built between 1910 and 1969, and reflect the suburban expansion of Portland across the Willamette River.... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Willamette River Bridge, Spanning Willamette River on Oswego Highway 3...
Significance: The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was ... More
Marquam Bridge, Spanning Willamette River at Interstate Highway 5, Por...
Significance: The Marquam Bridge is distinctive as the first Portland span constructed to serve the Interstate freeway system, as well as the first double deck freeway bridge in the state. The structure's func... More