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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
COTTONWOOD CREEK 083 Montana Poor 1928 98 507
COTTONWOOD CREEK 044 Montana Fair 1928 98 82
SNELL CREEK 073 Montana Poor 1928 98 100
E GALLATIN RIVER 076 Montana Fair 1928 98 100
BR MAIN CANAL 035 Montana Poor 1928 98 80
RESERVATION CREEK 036 Montana Fair 1928 98 25
GRAVEYARD CREEK 055 Montana Poor 1928 98 128
SMITH CREEK 053 Montana Fair 1928 98 638
CLARK FORK RIVER 001 Montana Fair 1928 98 100
BIG DITCH 010 Montana Fair 1928 98 828
COVE DITCH 011 Montana Fair 1928 98 828
COVE DITCH 012 Montana Fair 1928 98 828
HENSLEY CREEK 014 Montana Fair 1928 98 1,617
COVE DITCH 015 Montana Fair 1928 98 1,617
ALLEN CREEK 016 Montana Fair 1928 98 1,617
VALLEY CREEK 019 Montana Fair 1928 98 1,617
LOWER DEER CREEK 006 Montana Fair 1928 98 344
CUSTER COULEE 171 Montana Fair 1928 98 2,775
APPISTOKI CREEK Montana Fair 1929 97 183
MILES CREEK 037 Montana Poor 1929 97 507
MACKS CREEK 038 Montana Poor 1929 97 507
COTTONWOOD CREEK 072 Montana Poor 1929 97 100
BEAVER CREEK 030 Montana Fair 1929 97 100
MISSION CREEK 052 Montana Poor 1929 97 2,233
MRL SPUR (NOT IN USE) Montana Fair 1929 97 2,075
DRY CREEK Montana Fair 1929 97 204
PIPESTONE CREEK Montana Fair 1930 96 100
BEAVERHEAD RIVER 071 Montana Fair 1930 96 54
BIGHORN CANAL 018 Montana Fair 1930 96 100
THIRTY MILE CREEK 127 Montana Fair 1930 96 100
MILK RIVER 078 Montana Fair 1930 96 100
RED LODGE CREEK 042 Montana Fair 1930 96 100
SHONKIN CREEK 016 Montana Fair 1930 96 100
N FK BURNS CREEK 062 Montana Fair 1930 96 100
OTTER CREEK 036 Montana Fair 1930 96 100
JOCKO RIVER 013 Montana Good 1930 96 100
DAYTON CREEK 105 Montana Fair 1930 96 100
BOX ELDER CREEK 008 Montana Poor 1930 96 100
DODSON NORTH CANAL 005 Montana Fair 1930 96 100
EXETER CREEK 004 Montana Fair 1930 96 100
POWELL CREEK 063 Montana Fair 1930 96 916
DEMPSEY CREEK 059 Montana Poor 1930 96 916
RACETRACK CREEK 067 Montana Fair 1930 96 916
WILLIAMS COULEE 007 Montana Poor 1930 96 507
CONN`S COULEE 021 Montana Fair 1930 96 507
DRAINAGE 022 Montana Fair 1930 96 507
MUSSELSHELL RIVER 001 Montana Fair 1930 96 100
SWEENEY CREEK 064 Montana Poor 1930 96 128
TETON RIVER 051 Montana Fair 1930 96 100
HAY COULEE 006 Montana Fair 1930 96 100

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