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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
MUSSELSHELL RIVER 015 Montana Fair 1916 110 34
MUSSELSHELL RIVER 018 Montana Poor 1916 110 100
BITTERROOT RIVER 074 Montana Fair 1917 109 289
SURPRISE DITCH 060 Montana Poor 1918 108 537
ROCK CREEK 052 Montana Fair 1918 108 100
GALLATIN RIVER 084 Montana Poor 1919 107 569
HORSE PRAIRIE CREEK 031 Montana Fair 1920 106 100
RED ROCK RIVER 052 Montana Poor 1920 106 100
BATTLE CREEK 056 Montana Poor 1920 106 100
MISSOURI RIVER 019 Montana Poor 1920 106 178
MILL COULEE CANAL 064 Montana Fair 1920 106 100
IRRIGATION CANAL 041 Montana Fair 1920 106 21
IRRIGATION CANAL 042 Montana Poor 1920 106 21
CLARK FORK RIVER 020 Montana Poor 1920 106 100
POST CREEK 075 Montana Fair 1920 106 100
SHIELDS RIVER 027 Montana Fair 1920 106 100
ALKALI CREEK 001 Montana Poor 1920 106 100
CAMP CREEK Montana Fair 1920 106 2,274
BIG SPRING CREEK Montana Fair 1920 106 675
BIG SPRING CREEK Montana Fair 1920 106 2,412
BAD ROUTE CREEK 044 Montana Fair 1921 105 80
BAKER CREEK Montana Fair 1921 105 2,274
YELLOWSTONE RIVER Montana Fair 1921 105 1,160
BRIDGER CREEK 107 Montana Poor 1922 104 100
CABINET GORGE RESV 047 Montana Poor 1922 104 100
MILL DITCH Montana Fair 1922 104 8,747
FORT BELKNAP CANAL 057 Montana Fair 1923 103 100
MUDDY CREEK SLOUGH 111 Montana Fair 1923 103 100
LITTLE MUDDY CREEK 090 Montana Poor 1923 103 100
WILLOW CREEK 061 Montana Fair 1923 103 100
SHIELDS RIVER 023 Montana Poor 1923 103 100
DRAINAGE 021 Montana Fair 1923 103 164
TUNNEL CREEK Montana Fair 1924 102 5
E GALLATIN RIVER 032 Montana Fair 1924 102 100
NINEMILE CREEK 035 Montana Poor 1924 102 141
LOGAN CREEK Montana Fair 1925 101 1,230
BIG HOLE RIVER 089 Montana Poor 1925 101 100
ROSS FORK CREEK 018 Montana Poor 1925 101 16
WILD HORSE CREEK 023 Montana Poor 1925 101 100
SAND CREEK 031 Montana Fair 1925 101 100
SARPY CREEK 003 Montana Poor 1925 101 28
CANYON CREEK DITCH 075 Montana Fair 1925 101 2,295
MILL CREEK Montana Fair 1925 101 909
MCDONALD CREEK Montana Fair 1926 100 1,230
POWDER RIVER 061 Montana Fair 1926 100 100
E FORK PRYOR CREEK 174 Montana Fair 1926 100 564
N FK SUN RIVER Montana Poor 1927 99 99
BISON CREEK 016 Montana Poor 1927 99 100
CURLEY CREEK 005 Montana Good 1927 99 100
RUBY RIVER 023 Montana Poor 1927 99 133

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