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Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), Detroit, Marion, OR

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), D...

Significance: The Partial Viaduct #7964 is a seventeen span reinforced concrete viaduct comprised of span lengths from 21'-5" to 25'-0". The overall length of the structure is 417' and it is supported by square... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on North Santiam Highway (OR22), Marion Forks, Linn County, OR

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on Nor...

Significance: The Pamelia Creek Bridge #06805 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and b... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos City to Sumner Road, Coos Bay, Coos County, OR

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos ...

Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a blo... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

North Santiam River Bridge, Spanning North Fork of Santiam River at Milepoint 75.65 on North Santiam Highway (OR22), Santiam Terrace, Linn County, OR

North Santiam River Bridge, Spanning North Fork of Santiam River at Mi...

Significance: The North Santiam River Bridge #02454 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1937 by the Bureau of Public Roads... More

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos City to Sumner Road, Coos Bay, Coos County, OR

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos ...

Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a blo... More

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos City to Sumner Road, Coos Bay, Coos County, OR

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos ...

Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a blo... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on North Santiam Highway (OR22), Marion Forks, Linn County, OR

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on Nor...

Significance: The Pamelia Creek Bridge #06805 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and b... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos City to Sumner Road, Coos Bay, Coos County, OR

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos ...

Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a blo... More

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos City to Sumner Road, Coos Bay, Coos County, OR

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos ...

Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a blo... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North Santiam Highway (OR-22), Marion Forks, Linn County, OR

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North...

Significance: The Marion Creek Bridge #06807 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and bu... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

North Santiam River Bridge, Spanning North Fork of Santiam River at Milepoint 75.65 on North Santiam Highway (OR22), Santiam Terrace, Linn County, OR

North Santiam River Bridge, Spanning North Fork of Santiam River at Mi...

Significance: The North Santiam River Bridge #02454 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1937 by the Bureau of Public Roads... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

North Santiam River Bridge, Spanning North Fork of Santiam River at Milepoint 75.65 on North Santiam Highway (OR22), Santiam Terrace, Linn County, OR

North Santiam River Bridge, Spanning North Fork of Santiam River at Mi...

Significance: The North Santiam River Bridge #02454 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1937 by the Bureau of Public Roads... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos City to Sumner Road, Coos Bay, Coos County, OR

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos ...

Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a blo... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), Detroit, Marion, OR

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), D...

Significance: The Partial Viaduct #7964 is a seventeen span reinforced concrete viaduct comprised of span lengths from 21'-5" to 25'-0". The overall length of the structure is 417' and it is supported by square... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North Santiam Highway (OR-22), Marion Forks, Linn County, OR

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North...

Significance: The Marion Creek Bridge #06807 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and bu... More

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North Santiam Highway (OR-22), Marion Forks, Linn County, OR

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North...

Significance: The Marion Creek Bridge #06807 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and bu... More

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North Santiam Highway (OR-22), Marion Forks, Linn County, OR

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North...

Significance: The Marion Creek Bridge #06807 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and bu... More

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos City to Sumner Road, Coos Bay, Coos County, OR

Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos ...

Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a blo... More

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), Detroit, Marion, OR

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), D...

Significance: The Partial Viaduct #7964 is a seventeen span reinforced concrete viaduct comprised of span lengths from 21'-5" to 25'-0". The overall length of the structure is 417' and it is supported by square... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), Detroit, Marion, OR

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), D...

Significance: The Partial Viaduct #7964 is a seventeen span reinforced concrete viaduct comprised of span lengths from 21'-5" to 25'-0". The overall length of the structure is 417' and it is supported by square... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), Detroit, Marion, OR

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), D...

Significance: The Partial Viaduct #7964 is a seventeen span reinforced concrete viaduct comprised of span lengths from 21'-5" to 25'-0". The overall length of the structure is 417' and it is supported by square... More

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North Santiam Highway (OR-22), Marion Forks, Linn County, OR

Marion Creek Bridge, Spanning Marion Creek at Milepoint 66.42 on North...

Significance: The Marion Creek Bridge #06807 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and bu... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oregon to California Highway (US Route 97), Chiloquin, Klamath County, OR

Spring Creek Bridge, Spanning Spring Creek at Milepoint 253.98 on Oreg...

Significance: Known locally as the "Romeo and Juliet" Bridge, the Spring Creek Bridge is unique in Oregon for its rusticated abutments and pedestrian promenades that extend underneath the deck to intersect with... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on North Santiam Highway (OR22), Marion Forks, Linn County, OR

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on Nor...

Significance: The Pamelia Creek Bridge #06805 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and b... More

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on North Santiam Highway (OR22), Marion Forks, Linn County, OR

Pamelia Creek Bridge, Spanning Pamelia Creek at Milepoint 62.78 on Nor...

Significance: The Pamelia Creek Bridge #06805 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1933 by the Bureau of Public Roads and b... More

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warrenton-Astoria Highway (Highway No. 9), Astoria, Clatsop County, OR

Old Young's Bay Bridge, Spanning Young's Bay at Milepoint 6.89 on Warr...

Significance: It was the first moveable span bridge designed by state bridge engineer Conde B. McCullough and is one of only five surviving double-leaf bascule bridges in Oregon built before 1941. The bridge is... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More

North Santiam River Bridge, Spanning North Fork of Santiam River at Milepoint 75.65 on North Santiam Highway (OR22), Santiam Terrace, Linn County, OR

North Santiam River Bridge, Spanning North Fork of Santiam River at Mi...

Significance: The North Santiam River Bridge #02454 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1937 by the Bureau of Public Roads... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, on Warrenton Highway (Highway No. 9), Astoria, Clatsop County, OR

Lewis & Clark Bridge, Spanning Lewis & Clark River at Milepoint 4.78, ...

Significance: It is Oregon's only remaining single-leaf bascule draw span built before WWII and is an early moveable span bridge designed by state bridge engineer Conde B. McCullough. The bridge is significant ... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), Detroit, Marion, OR

Partial Viaduct, Milepoint 40.3 on North Santiam Highway (Route 22), D...

Significance: The Partial Viaduct #7964 is a seventeen span reinforced concrete viaduct comprised of span lengths from 21'-5" to 25'-0". The overall length of the structure is 417' and it is supported by square... More

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside, Clatsop County, OR

Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U...

Significance: The Neawanna Creek Bridge #1305 is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its assoc... More

North Santiam River Bridge, Spanning North Fork of Santiam River at Milepoint 75.65 on North Santiam Highway (OR22), Santiam Terrace, Linn County, OR

North Santiam River Bridge, Spanning North Fork of Santiam River at Mi...

Significance: The North Santiam River Bridge #02454 is located on the North Santiam Highway within the boundaries of the Willamette National Forest. The bridge was designed in 1937 by the Bureau of Public Roads... More

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Road 124) at Milepoint 1.38, Prineville, Crook County, OR

Crooked River Bridge, Spanning Crooked River on Elliot Lane (County Ro...

Significance: The Crooked River Bridge is a rare example of a Double Intersection Warren Through Truss (the main span), with a secondary span comprised of a Warren Pony Truss with Polygonal Upper Chords. Both s... More