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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
NORTH INLET Colorado Fair 1950 76 924
MONTROSE AND DELTA CANAL Colorado Fair 1950 76 714
Phillips Creek Colorado Fair 1950 76 28
Elkhead Creek Colorado Fair 1950 76 21
Willow Creek Colorado Fair 1950 76 487
Soda Creek Colorado Fair 1950 76 3,112
N.POUDRE DITCH SAND CRK Colorado Fair 1950 76 12,500
KIOWA CREEK Colorado Poor 1950 76 532
SAND CREEK Colorado Fair 1950 76 305
FIRST CREEK Colorado Fair 1950 76 174
FIRST CREEK Colorado Fair 1950 76 129
WOLF CREEK Colorado Fair 1950 76 87
RALSTON CREEK Colorado Fair 1950 76 576
GRIZZLY CREEK Colorado Fair 1950 76 1,300
FALLS GULCH Colorado Fair 1950 76 1,200
HILLS GULCH Colorado Fair 1950 76 1,100
YOUNGS GULCH Colorado Fair 1950 76 1,100
LARIMER COUNTY CANAL Colorado Fair 1950 76 14,000
WINDSOR RES CANAL DITCH Colorado Good 1950 76 19,000
FLOOD DRAINAGE Colorado Good 1950 76 19,000
FLOOD DRAINAGE Colorado Fair 1950 76 14,000
FLOOD DRAINAGE Colorado Good 1950 76 14,000
FLOOD DRAINAGE Colorado Fair 1950 76 14,000
TRIB. OF TWO BUTTES CRK Colorado Poor 1950 76 21
PLUM CREEK Colorado Fair 1950 76 53
TRIB. OF TWO BUTTES CRK Colorado Poor 1950 76 9
SOUTH FORK SAND ARROYO Colorado Fair 1950 76 13
TRIBUTARY OF PLUM CREEK Colorado Fair 1950 76 14
TRIBUTARY OF PLUM CREEK Colorado Fair 1950 76 13
BEAR CREEK Colorado Poor 1950 76 4
HORSE CREEK Colorado Fair 1950 76 1
TRIB. OF TWO BUTTES CRK Colorado Fair 1950 76 17
TRIB. OF HORSE CREEK Colorado Fair 1950 76 14
Boulder Feeder Ditch Colorado Fair 1950 76 2,692
Boulder Feeder Ditch Colorado Fair 1950 76 422
FT. LYON CANAL Colorado Fair 1950 76 40
FT. LYON CANAL Colorado Fair 1950 76 71
FT. LYON CANAL Colorado Fair 1950 76 46
ARAPAHOE CREEK Colorado Fair 1950 76 1,300
LOUDEN CANAL Colorado Fair 1950 76 52
BIG THOMPSON RIVER Colorado Fair 1950 76 18,000
HIGHLINE CANAL Colorado Fair 1950 76 2,529
NORTH CHEYENNE CREEK Colorado Fair 1950 76 1,202
SHOOKS RUN Colorado Fair 1950 76 5,771
BUFFALO CREEK Colorado Fair 1950 76 1,329
UP RR Colorado Fair 1950 76 40,000
SPRING CREEK Colorado Fair 1950 76 1,658
CLEAR CREEK Colorado Fair 1950 76 7,500
CLEAR CREEK Colorado Fair 1950 76 7,500
MAYHEM GULCH Colorado Good 1950 76 7,500

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