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Historic Bridges in Montana

662 bridges built before 1951 in Montana still in service today.

Bridges Built Before 1951

The United States has 662 bridges in Montana 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
DRY WASH Montana Fair 1936 90 449
CURRANT CREEK Montana Fair 1936 90 441
HALFWAY CREEK Montana Fair 1936 90 1,594
NEVADA CREEK Montana Poor 1936 90 1,594
ASSINIBOINE CREEK Montana Fair 1936 90 215
POINDEXTER SLOUGH Montana Fair 1936 90 612
RR Montana Poor 1936 90 612
DRAINAGE Montana Fair 1936 90 188
DRAINAGE Montana Fair 1936 90 188
RR Montana Fair 1936 90 3,404
Anita Dam Spillway Montana Poor 1937 89 10
FT. PECK SPILLWAY Montana Fair 1937 89 203
FRESNO RES SPILLWAY 038 Montana Fair 1937 89 232
ST REGIS RIVER 059 Montana Poor 1937 89 140
DRY CREEK 004 Montana Fair 1937 89 556
E FORK BITTERROOT RIVER Montana Fair 1937 89 1,099
FOUR MILE CREEK Montana Fair 1937 89 486
BOULDER RIVER OVERFLOW Montana Poor 1937 89 2,133
N FORK FIRST HAY CREEK Montana Fair 1937 89 856
SECOND HAY CREEK Montana Fair 1937 89 726
SAND COULEE CREEK Montana Fair 1937 89 1,597
ROCK CREEK Montana Fair 1938 88 50
DEEP COULEE Montana Fair 1938 88 150
MEDICINE TAIL COULEE Montana Poor 1938 88 150
THIRTY MILE CREEK 097 Montana Poor 1938 88 100
BATTLE CREEK 025 Montana Good 1938 88 100
RUSSELL CREEK 005 Montana Fair 1938 88 100
CROW CREEK 034 Montana Fair 1938 88 100
N COTTONWOOD CREEK 037 Montana Fair 1938 88 100
LITTLE BELT CREEK 003 Montana Fair 1938 88 158
BELT CREEK 084 Montana Fair 1938 88 155
CASTNER COULEE 096 Montana Good 1938 88 100
BIRD CREEK 038 Montana Fair 1938 88 100
FLAT CREEK 034 Montana Fair 1938 88 100
FORT SHAW CANAL 041 Montana Good 1938 88 100
RR 059 Montana Fair 1938 88 100
HIGHWOOD CREEK 012 Montana Fair 1938 88 100
T AND Y CANAL 032 Montana Poor 1938 88 100
COTTONWOOD CREEK 018 Montana Fair 1938 88 100
MILK RIVER 037 Montana Fair 1938 88 100
FISHER RIVER 075 Montana Good 1938 88 100
CLEARWATER RIVER 082 Montana Poor 1938 88 100
FERRY CREEK 037 Montana Fair 1938 88 677
SHIELDS RIVER OVERFL 022 Montana Poor 1938 88 100
W BOULDER RIVER 038 Montana Poor 1938 88 52
FOUR MILE CREEK 039 Montana Fair 1938 88 157
BOULDER RIVER 040 Montana Fair 1938 88 157
BIG CREEK 062 Montana Fair 1938 88 100
DODSON SOUTH CANAL 116 Montana Poor 1938 88 33
DUPUYER CREEK 067 Montana Fair 1938 88 100

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