C.B. McCullough was the state bridge engineer for Oregon from 1919 to 1935. Under his watch many of the key spans on Oregon early highways were designed and constructed. His philosophy to bridge design was to make the structure fit the site in which it was being built, have the bridge be cost effective, and finally he emphasized building structures that were pleasing to the eye.

McCullough assisted in pioneering different design and construction methods in concrete arch construction, along with building a solid reputation for the Oregon Highway Department. The legacy he left still lives in the design and maintenance of Oregon Bridges. Oregon is one of the leaders in historic bridge preservation along with creating innovative and eye pleasing structures to replace aging structures of McCullough's era.

Adkisson Bridge (Wasco County, Oregon)
Engineer, 1925
Concrete arch bridge over 15 Mile Creek on Boyd Loop Road
Open to traffic

Alsea Bay Bridge (Lincoln County, Oregon)
Engineer, 1936
Lost concrete through arch bridge over Alsea Bay on U.S. 101 in Waldport
Replaced by new bridge

Barton Bridge (Clackamas County, Oregon)
1936-Tied Arch Designer, 1970
Steel through arch bridge over Clackamas River on Bakers Ferry Road
Open to traffic

Ben Jones Bridge (Lincoln County, Oregon)
Engineer, 1927
Concrete arch bridge over Rocky Creek on Otter Crest Loop
Open to traffic

Big Creek Bridge (Lane County, Oregon)
Engineer, 1931
Reinforced concrete tied arch bridge over Big Creek on US 101
Open to traffic

Cape Creek Bridge (Lane County, Oregon)
Engineer, 1931
Concrete arch bridge over Cape Creek on US 101
Open to traffic

Caveman Bridge (Josephine County, Oregon)
Engineer, 1927
Rainbow arch bridge over Rogue River on Southbound US 199 in Grants Pass
Open to traffic

Conde B. McCullough Memorial Bridge (Coos County, Oregon)
Lead Engineer, 1936
Truss bridge over Coos Bay on US 101 in North Bend
Open to traffic

Crooked River Bridge (Jefferson County, Oregon)
Engineer, 1926
Steel arch bridge over Crooked River on Former U.S. 97 alignment in Terrebonne
Open to pedestrians

Deschutes River Bridge (Wasco County, Oregon)
Engineer, 1929
Deck truss bridge over Deschutes River on US 197 in Maupin
Open to traffic

Dry Canyon Creek Bridge (Wasco County, Oregon)
Engineer, 1921
Concrete arch bridge over Dry Canyon Creek on Historical Columbia River Highway
Open to traffic

Elk Creek Bridge No. 1 (Douglas County, Oregon)
Engineer, 1931
Deck truss bridge over Elk Creek on OR 38
Replaced by new bridge in 2008

Elk Creek Bridge No. 2 (Douglas County, Oregon)
Engineer, 1932
Lost Stringer bridge over Elk Creek on Or 38 (Hwy 045)
Replaced by new bridge in 2008

Elk Creek Bridge No. 3 (Douglas County, Oregon)
Engineer, 1932
Deck truss bridge over Elk Creek on OR 38
Replaced by new bridge in 2008

Elk Creek Bridge No. 4 (Douglas County, Oregon)
Engineer, 1931
Deck truss bridge over Elk Creek on OR 38
Replaced by new bridge in 2008

Gold Hill Bridge (Jackson County, Oregon)
Engineer, 1927
Concrete arch bridge over Rogue River on OR 99 at Gold Hill
Open to traffic

Issac Lee Patterson Bridge (Curry County, Oregon)
Engineer, 1930
Concrete arch bridge over Rogue River on US 101 in Gold Beach
Open to traffic

Jacob Conser Bridge (Marion County, Oregon)
Engineer, 1933
Rainbow arch bridge over Santiam River on HWY 164
Open to traffic

Keno Bridge (Klamath County, Oregon)
Engineer, 1930
Lost Concrete through arch bridge over Klamath River on Green Springs Highway (OR-66) in Keno
Replaced by new bridge

McLoughlin Boulevard Bridge (Clackamas County, Oregon)
Engineer, 1933
Steel through arch bridge over Clackamas River on OR 99E in Gladstone
Open to traffic

Mill Creek Bridge (Wasco County, Oregon)
Engineer, 1920
Stringer bridge over Mill Creek on W 6th Street in City of the Dalles
Open to traffic

Mosier Creek Bridge (Wasco County, Oregon)
Engineer, 1920
Concrete arch bridge over Mosier Creek on HWY 100 in Mosier
Open to traffic

Mosier Tunnel (Wasco County, Oregon)
Design Engineer, 1920
Tunnel under Mosier Tunnel on Historical Columbia River Highway Trail
Open to pedestrians

Myrtle Creek Arch Bridge (Douglas County, Oregon)
Engineer, 1922
Concrete arch bridge over South Umpqua River on CR 386 in Myrtle Creek
Open to traffic

Neawanna Creek Bridge (Clatsop County, Oregon)
Engineer, 1930
Concrete deck girder bridge over Neawanna Creek on U.S. 101 in Seaside
Open to traffic

North Yamhill River Bridge (Yamhill County, Oregon)
Engineer, 1921
Deck truss bridge over North Yamhill River on Southbound OR 99W
Open to traffic

Oakland Bridge (Douglas County, Oregon)
Built 1925
Deck truss bridge over Calapooya Creek on Shady Highway in Oakland
Open to traffic

Rocky Point Bridge (Jackson County, Oregon)
Engineer, 1919
Concrete arch bridge over Rogue River on OR 99
Open to traffic

Salmon River Bridge (Clackamas County, Oregon)
Lead Engineer, 1929
Deck truss bridge over Salmon River on E. Brightwood Loop
Open to traffic

Scottsburg Bridge (Douglas County, Oregon)
Built 1929
Through truss bridge over Umpqua River on OR 38
Open to traffic

Siuslaw River Bridge (Lane County, Oregon)
Engineer, 1936
Bascule bridge over Siuslaw River on US 101 in Florence
Open to traffic

Springfield Bridge (Lane County, Oregon)
Built 1929
Through truss bridge over Willamette River on Westbound OR 126 in Springfield
Open to traffic

Sunny Valley Covered Bridge (Josephine County, Oregon)
Engineer, 1920
Covered bridge over Grave Creek on Sunny Valley Loop
Open to traffic

Tucker Bridge (Hood River County, Oregon)
Engineer, 1932
Concrete arch bridge over Hood River on HWY 281
Open to traffic

Umpqua River Bridge (Douglas County, Oregon)
Lead Engineer, 1936
Swing bridge over Umpqua River on US 101 in Reedsport
Open to traffic

Willamette River Bridge (Clackamas County, Oregon)
Engineer, 1922
Steel through arch bridge over Willamette River on HWY 3 in Oregon City
Open to traffic

Wilson River Bridge (Tillamook County, Oregon)
Engineer, 1931
Reinforced concrete tied arch bridge over Wilson River on US 101
Open to traffic

Winchester Bridge (Douglas County, Oregon)
Enngineer, 1923
Concrete arch bridge over North Umpqua River on OR 99
Open to traffic

Winston Bridge (Douglas County, Oregon)
Engineer, 1934
Steel through arch bridge over South Umpqua River on Eastbound OR 42
Open to traffic

Yaquina Bay Bridge (Lincoln County, Oregon)
Lead Engineer, 1934
Steel through arch bridge over Yaquina Bay on US 101 in Newport
Open to traffic