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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
RR 061 Montana Poor 1932 94 1,001
CLARK FORK 054 Montana Poor 1932 94 356
BEAVER CREEK 101 Montana Fair 1932 94 100
ARMELLS CREEK 045 Montana Fair 1932 94 352
WYANT COULEE 044 Montana Fair 1932 94 273
WORK CREEK 041 Montana Poor 1932 94 29
PUMP CREEK 042 Montana Fair 1932 94 29
BIG DITCH 051 Montana Poor 1932 94 2,489
HAY CREEK Montana Fair 1932 94 516
MIDWAY COULEE Montana Fair 1932 94 229
W FORK POPLAR R OVRFLOW Montana Poor 1932 94 229
RATTLESNAKE CREEK Montana Fair 1932 94 1,577
WOODY ISLAND COULEE 134 Montana Fair 1933 93 100
FORT BELKNAP CANAL 015 Montana Fair 1933 93 126
FORT BELKNAP CANAL 008 Montana Poor 1933 93 212
RED ROCK COULEE 009 Montana Fair 1933 93 212
RED ROCK COULEE 012 Montana Fair 1933 93 41
FT. BELKNAP CANAL 01 Montana Fair 1933 93 41
RED ROCK COULEE 002 Montana Fair 1933 93 40
RED ROCK COULEE 004 Montana Fair 1933 93 40
COW CREEK 091 Montana Good 1933 93 47
SNAKE CREEK 042 Montana Fair 1933 93 100
PARADISE VALLEY CANAL037 Montana Fair 1933 93 28
LITTLE MUDDY CREEK 126 Montana Fair 1933 93 100
LOWLINE CANAL 056 Montana Fair 1933 93 100
CATARACT CREEK 030 Montana Poor 1933 93 100
SHEEP CREEK 117 Montana Fair 1933 93 484
MISSOURI RIVER 054 Montana Poor 1933 93 484
LEVINGS GULCH 158 Montana Fair 1933 93 13
BOULDER RIVER 041 Montana Poor 1933 93 157
BEAVER CREEK OVERFLO 100 Montana Fair 1933 93 100
CABIN CREEK 011 Montana Fair 1933 93 100
IRRIGATION DITCH 001 Montana Poor 1933 93 281
DRAINAGE 009 Montana Poor 1933 93 219
DRAINAGE 010 Montana Fair 1933 93 219
DRAINAGE 015 Montana Fair 1933 93 219
IRRIGATION DITCH 024 Montana Fair 1933 93 273
POST CREEK Montana Fair 1933 93 8,158
NINE PIPE RESERVOIR Montana Poor 1933 93 8,158
INDIAN CREEK Montana Fair 1933 93 1,782
DAISY DEAN CREEK Montana Fair 1933 93 508
REDWATER RIVER Montana Fair 1933 93 1,263
ST. MARY RIVER Montana Fair 1934 92 2,300
DIVIDE CREEK Montana Fair 1934 92 2,300
DRY RAVINE Montana Fair 1934 92 1,942
HEPPLER COULEE 109 Montana Fair 1934 92 421
FORT SHAW CANAL 110 Montana Fair 1934 92 421
SIMMS CREEK 112 Montana Fair 1934 92 421
CLARK FORK RIVER 020 Montana Poor 1934 92 371
WEGNER CREEK 055 Montana Fair 1934 92 329

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