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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
MILL COULEE CANAL 093 Montana Good 1950 76 100
BENCH SOUTH CANAL 066 Montana Fair 1950 76 19
SUN RIVER SLOUGH 060 Montana Fair 1950 76 100
MILL COULEE CANAL 049 Montana Fair 1950 76 100
LITTLE BELT CREEK 100 Montana Good 1950 76 158
LITTLE BELT CREEK 099 Montana Fair 1950 76 158
CORA CREEK 075 Montana Fair 1950 76 100
OTTER CREEK 125 Montana Fair 1950 76 13
SAND COULEE CREEK 081 Montana Good 1950 76 100
SAND COULEE CREEK 087 Montana Good 1950 76 100
SAND COULEE CREEK 088 Montana Fair 1950 76 100
SHEEP CREEK 097 Montana Poor 1950 76 68
W FORK HOUND CREEK 120 Montana Fair 1950 76 100
COAL CREEK 027 Montana Poor 1950 76 100
EAGLE CREEK 005 Montana Fair 1950 76 100
MILL CREEK 040 Montana Fair 1950 76 824
FRENCH CREEK 043 Montana Fair 1950 76 293
E FORK ROCK CREEK 030 Montana Good 1950 76 186
TOBACCO RIVER 146 Montana Fair 1950 76 100
GRAVE CREEK 007 Montana Fair 1950 76 100
PIPE CREEK 027 Montana Good 1950 76 190
FIDDLE CREEK 024 Montana Fair 1950 76 100
FLATWILLOW CREEK 016 Montana Poor 1950 76 100
BLACK COULEE 072 Montana Poor 1950 76 49
FRENCHMAN CREEK 126 Montana Fair 1950 76 22
DRAINAGE 057 Montana Poor 1950 76 100
NO NAME DITCH 052 Montana Fair 1950 76 53
VALIER CANAL 035 Montana Good 1950 76 120
BIRCH CREEK 022 Montana Fair 1950 76 100
PONDERA COULEE 047 Montana Fair 1950 76 100
TELEGRAPH CREEK 061 Montana Fair 1950 76 100
BIG MUDDY CREEK 038 Montana Fair 1950 76 100
RATTLESNAKE CREEK 002 Montana Poor 1950 76 100
NEISER CREEK 012 Montana Fair 1950 76 100
WOLF CREEK 040 Montana Fair 1950 76 64
BIG MUDDY CREEK 046 Montana Poor 1950 76 79
SNAKE CREEK 042 Montana Fair 1950 76 100
WEST FORK WOLF CREEK 057 Montana Fair 1950 76 100
IRRIGATION CANAL 107 Montana Fair 1950 76 100
BUFFALO COULEE 108 Montana Poor 1950 76 23
ARROW CREEK 102 Montana Fair 1950 76 100
BIG DITCH 044 Montana Fair 1950 76 881
DODSON SOUTH CANAL 096 Montana Fair 1950 76 100
TWO MEDICINE RIVER Montana Fair 1950 76 1,266
TWO MEDICINE CANAL Montana Fair 1950 76 1,475
RR Montana Fair 1950 76 1,227
MISSOURI RIVER OVERFLOW Montana Poor 1950 76 818
WEBER IRRIGATION CANAL Montana Poor 1950 76 2,300
GALLATIN RIVER Montana Fair 1950 76 8,952
COWBOY STEELE CREEK Montana Fair 1950 76 158

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