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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
BR MAIN CANAL 036 Montana Poor 1938 88 80
SHADWELL CREEK 019 Montana Fair 1938 88 100
MUDDY CREEK 018 Montana Poor 1938 88 100
NO NAME DITCH 011 Montana Good 1938 88 100
GREENFIELD CANAL 053 Montana Good 1938 88 18
TETON RIVER 060 Montana Fair 1938 88 100
VANDALIA SOUTH CANAL 089 Montana Poor 1938 88 100
CHERRY CREEK 080 Montana Fair 1938 88 100
CANYON CREEK DITCH 108 Montana Fair 1938 88 887
BIG DITCH 113 Montana Fair 1938 88 522
RUSSELL CREEK 001 Montana Fair 1938 88 100
BBWA CANAL 117 Montana Fair 1938 88 4,906
DRAINAGE Montana Poor 1938 88 214
LANDERS FORK Montana Fair 1938 88 2,011
YELLOWSTONE RIVER Montana Fair 1938 88 1,699
DRAINAGE Montana Fair 1938 88 537
FRONT ST-RR Montana Fair 1938 88 2,161
BOULDER RIVER Montana Fair 1938 88 2,133
SPRING CREEK Montana Fair 1938 88 2,515
DRAINAGE 117 Montana Fair 1939 87 452
CATARACT CREEK 048 Montana Fair 1939 87 100
BUFFALO RAPIDS CANAL042 Montana Fair 1939 87 80
YATES CREEK 003 Montana Fair 1939 87 53
FLESHMAN CREEK 071 Montana Good 1939 87 100
TETON RIVER Montana Fair 1939 87 1,265
ABANDONED RR-ANTELOPE CR Montana Poor 1939 87 2,063
DAHL CREEK Montana Poor 1939 87 309
MAIN CREEK Montana Poor 1939 87 309
DRY CREEK Montana Fair 1939 87 309
DRAINAGE Montana Fair 1939 87 292
DRAINAGE Montana Fair 1939 87 1,148
DRAINAGE Montana Fair 1939 87 1,148
N FORK MCDONALD CREEK Montana Fair 1939 87 1,067
DRAINAGE Montana Fair 1939 87 1,067
DRAINAGE Montana Fair 1939 87 1,067
IRRIGATION RESERVOIR Montana Fair 1939 87 1,067
DRAINAGE Montana Fair 1939 87 1,067
DRAINAGE Montana Poor 1939 87 1,067
DRAINAGE Montana Fair 1939 87 1,067
DRAINAGE Montana Fair 1939 87 1,067
S FORK MCDONALD CREEK Montana Fair 1939 87 1,067
TIMBER CREEK Montana Fair 1939 87 680
SKULL CREEK Montana Fair 1939 87 680
CEMETERY COULEE Montana Poor 1939 87 680
DRAINAGE Montana Poor 1939 87 680
DRAINAGE Montana Fair 1939 87 680
DRAINAGE Montana Poor 1939 87 680
SHEEP CREEK Montana Fair 1939 87 376
BOYLE-O`HANLON COULEES Montana Fair 1939 87 479
TETON RIVER Montana Fair 1939 87 183

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