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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
REEDERS ALLEY 001 Montana Fair 1881 145 100
JEFFERSON RIVER 063 Montana Poor 1894 132 100
DEARBORN RIVER 011 Montana Fair 1896 130 31
JEFFERSON RIVER 004 Montana Poor 1897 129 100
JEFFERSON RIVER 046 Montana Fair 1898 128 87
ST REGIS RIVER Montana Fair 1900 126 50
LYONS CREEK 032 Montana Good 1900 126 100
LOCATE CREEK 045 Montana Fair 1901 125 23
FLAT CREEK 036 Montana Poor 1901 125 100
MADISON RIVER 046 Montana Fair 1902 124 100
LITTLE PRICKLY PEAR 109 Montana Fair 1905 121 37
YELLOWSTONE RIVER 094 Montana Fair 1907 119 78
BLACKFOOT RIVER 088 Montana Poor 1907 119 100
YELLOWSTONE RIVER 030 Montana Fair 1907 119 37
USBR MAIN CANAL 001 Montana Fair 1907 119 100
BIG SPRING CREEK Montana Fair 1908 118 100
BEAVERHEAD RIVER 023 Montana Poor 1908 118 14
SMITH RIVER 033 Montana Fair 1908 118 100
COTTONWOOD CREEK 030 Montana Fair 1908 118 100
LITTLE BLACKFOOT R 018 Montana Fair 1908 118 100
USBR MAIN CANAL 092 Montana Fair 1908 118 100
BELT CREEK Montana Fair 1909 117 99
BELT CREEK Montana Fair 1909 117 99
RED ROCK RIVER 086 Montana Fair 1909 117 15
SNAKE CREEK 048 Montana Fair 1911 115 100
SWAN RIVER 110 Montana Poor 1911 115 1,503
RATTLESNAKE CREEK 002 Montana Good 1911 115 2,157
SPRING CREEK 019 Montana Fair 1912 114 47
WARM SPRINGS CREEK 016 Montana Poor 1912 114 100
KOOTENAI RIVER 070 Montana Fair 1912 114 100
FLATHEAD CREEK 020 Montana Fair 1912 114 100
WEST BOULDER RIVER 025 Montana Poor 1912 114 100
RED ROCK RIVER 121 Montana Poor 1913 113 4
ELBOW CREEK 036 Montana Fair 1913 113 100
BLUEWATER CREEK 001 Montana Fair 1913 113 175
ELK CREEK 041 Montana Poor 1914 112 100
PINKHAM CREEK 140 Montana Poor 1914 112 100
LITTLE BLACKFOOT R 027 Montana Poor 1914 112 19
BIG HOLE RIVER 009 Montana Fair 1914 112 100
ABANDONED RAILROAD Montana Fair 1914 112 4,262
BIG HOLE RIVER 123 Montana Poor 1915 111 100
BLUEWATER CREEK 038 Montana Fair 1915 111 100
MUSSELSHELL RIVER 003 Montana Fair 1915 111 100
ELK CREEK 029 Montana Fair 1915 111 100
POTTER CREEK 005 Montana Poor 1915 111 100
BEAVER CREEK 132 Montana Poor 1915 111 100
PUMPKIN CREEK 021 Montana Fair 1915 111 100
BEAVER CREEK 104 Montana Fair 1915 111 68
Sun River Montana Poor 1916 110 40
CLARK FORK 053 Montana Poor 1916 110 174

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