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Historic Bridges in Colorado

857 bridges built before 1951 in Colorado still in service today.

Bridges Built Before 1951

The United States has 857 bridges in Colorado built before 1951 that remain in active service. These structures are 75+ years old — many predate modern engineering codes and were not designed for today's traffic volumes and vehicle weights. The average design life of a bridge is 50 years, making these aging structures a significant infrastructure concern.

Clear
Bridge State Condition Year Built Age (Years) ADT
No Name Creek Colorado Fair 1940 86 346
S.FORK REPUBLICAN RIVER Colorado Fair 1940 86 26
UNNAMED DRAINAGE Colorado Fair 1940 86 33
SMOKY HILL RIVER Colorado Fair 1940 86 10
SALT CREEK Colorado Fair 1940 86 24
CHINA CREEK Colorado Fair 1940 86 161
TRINCHERA CREEK Colorado Fair 1940 86 29
UNNAMED NATURAL DRAINAGE Colorado Fair 1940 86 44
TREMENTINA CREEK Colorado Fair 1940 86 25
PATTON ARROYO Colorado Poor 1940 86 18
ADOBE CREEK Colorado Poor 1940 86 69
MUSTANG CREEK Colorado Fair 1940 86 2
N FORK MUSTANG CREEK Colorado Fair 1940 86 2
LAKEWOOD GULCH | W 9TH A Colorado Fair 1940 86 9,987
N. Sterling Inlet Canal Colorado Poor 1940 86 73
N. Sterling Inlet Canal Colorado Fair 1940 86 61
N. Sterling Outlet Canal Colorado Fair 1940 86 3
N. Sterling Outlet Canal Colorado Poor 1940 86 6
N. Sterling Outlet Canal Colorado Fair 1940 86 —
Spring Canyon Creek Colorado Poor 1940 86 126
Frenchman Creek Colorado Fair 1940 86 23
Trib.N.Fork Frenchman Ck Colorado Poor 1940 86 65
Laramie River Colorado Fair 1940 86 95
Larimer County Canal Colorado Fair 1940 86 221
Big Thompson River Colorado Fair 1940 86 3,417
North Poudre Canal Colorado Fair 1940 86 6,105
DRAW Colorado Fair 1940 86 740
Fort Morgan Canal Colorado Fair 1940 86 801
Lower Platte Beaver Cnl Colorado Fair 1940 86 40
White River Colorado Fair 1940 86 278
Slater Creek Colorado Fair 1940 86 179
Yampa River Colorado Fair 1940 86 79
Fortification Creek Colorado Fair 1940 86 342
MISSOURI CREEK Colorado Fair 1940 86 890
MAITLAND ARROYO Colorado Fair 1940 86 890
RIO SAN ANTONIO Colorado Fair 1940 86 530
ALKALI CREEK Colorado Fair 1940 86 180
HOLLY SEEP Colorado Poor 1940 86 519
BESSEMER DITCH Colorado Fair 1940 86 6,100
RIO GRANDE CANAL Colorado Fair 1940 86 62
FARMERS UNION CANAL Colorado Fair 1940 86 60
White River Colorado Fair 1940 86 184
Hewes Ditch Colorado Fair 1940 86 51
Arikaree River Colorado Fair 1940 86 13
S. Fork Republican River Colorado Fair 1940 86 68
EATON DITCH Colorado Poor 1941 85 2,400
PAWNEE CREEK OVERFLOW Colorado Good 1941 85 3,700
STERLING CANAL NO 1 Colorado Poor 1941 85 2,150
LWR PLATTE BEAVER CANAL Colorado Fair 1941 85 1,400
PREWITT RES INTAKE CANAL Colorado Fair 1941 85 1,100

About Historic Bridge Data

Bridges built before 1951 are classified as historic in this database. Many were designed to 1940s standards with lower load limits and narrower lanes. While FHWA requires regular inspections of all bridges regardless of age, older structures often require more frequent monitoring and rehabilitation investment.

All Bridges Poor Condition Scour Critical Bridge Stats