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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
TOSTON CANAL Montana Poor 1948 78 422
CROW CREEK Montana Fair 1948 78 206
COTTONWOOD CREEK Montana Fair 1948 78 224
BOULDER CR Montana Poor 1949 77 50
LITTLE BIGHORN RIVER Montana Fair 1949 77 3,889
HOLLAND CREEK 051 Montana Fair 1949 77 100
YELLOWSTONE RIVER 004 Montana Fair 1949 77 1,471
IRRIGATION CANAL 031 Montana Fair 1949 77 100
MUSSELSHELL RIVER 009 Montana Fair 1949 77 100
YELLOWSTONE RIVER 170 Montana Poor 1949 77 4,005
BITTERROOT RIVER Montana Fair 1949 77 6,979
JEFFERSON RIVER Montana Fair 1949 77 1,515
CLEARWATER RIVER Montana Fair 1949 77 3,044
DEARBORN RIVER Montana Fair 1949 77 1,432
STOCKPASS Montana Poor 1949 77 1,432
BEAVER CREEK Montana Fair 1949 77 1,671
TONGUE RIVER Montana Fair 1949 77 2,126
STONE CREEK Montana Fair 1949 77 2,403
BEAVERHEAD RIVER Montana Fair 1949 77 2,403
BEAVERHEAD RIVER Montana Fair 1949 77 2,865
CHIMNEY ROCK Montana Fair 1949 77 235
FLAT CREEK Montana Fair 1949 77 235
TRIBUTARY FLAT CREEK Montana Fair 1949 77 235
ARROW CREEK Montana Fair 1949 77 171
DRY WOLF CREEK Montana Fair 1949 77 265
WARM SPRING CREEK Montana Fair 1949 77 377
RR Montana Fair 1949 77 1,416
GALLATIN RIVER Montana Fair 1949 77 3,038
JOCKO RIVER Montana Good 1949 77 934
FARMER`S COULEE Montana Fair 1949 77 169
BIG MUDDY CREEK Montana Fair 1949 77 151
BIG MUDDY CREEK OVERFLOW Montana Fair 1949 77 151
CLARK FORK RIVER Montana Poor 1949 77 2,330
LITTLE PRICKLY PEAR CR Montana Fair 1949 77 501
CANYON CREEK Montana Fair 1949 77 501
CANYON CREEK Montana Fair 1949 77 501
WILLOW CREEK Montana Fair 1949 77 133
MUSSELSHELL RIVER Montana Fair 1949 77 247
PASS CREEK Montana Good 1949 77 299
PASS CREEK Montana Fair 1949 77 299
Canyon Ferry Spillway Montana Fair 1950 76 600
BOULDER RIVER Montana Poor 1950 76 157
BIG HOLE RIVER Montana Fair 1950 76 50
COAL CR Montana Fair 1950 76 40
TELEGRAPH CREEK Montana Poor 1950 76 30
TROUT CREEK Montana Fair 1950 76 50
TWO MEDICINE RIVER Montana Fair 1950 76 183
TWO LEGGIN`S CANAL 005 Montana Fair 1950 76 100
UNNAMED CREEK 059 Montana Fair 1950 76 100
GREENFIELD S CANAL 065 Montana Fair 1950 76 100

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