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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
LINDEKE COULEE 007 Montana Poor 1930 96 100
DRAINAGE 009 Montana Fair 1930 96 100
BIGHORN RIVER 126 Montana Fair 1930 96 100
BIG SPRING CREEK 059 Montana Fair 1930 96 100
BIG SPRING CREEK 060 Montana Fair 1930 96 100
YELLOWSTONE RIVER Montana Fair 1930 96 4,964
SOUTH FORK SUNDAY CREEK Montana Fair 1930 96 1,474
WARM SPRINGS CREEK Montana Fair 1930 96 2,082
DRAINAGE Montana Fair 1930 96 1,148
APIKUNI CREEK Montana Fair 1931 95 452
WINDY CREEK Montana Fair 1931 95 452
BIG SHEEP CREEK 026 Montana Fair 1931 95 100
LIMEKILN CANYON 022 Montana Poor 1931 95 60
TWO LEGGINS CANAL 0 Montana Poor 1931 95 564
DRAINAGE 025 Montana Fair 1931 95 100
NOVAK CREEK 005 Montana Fair 1931 95 316
MISSOURI RIVER-RR 069 Montana Poor 1931 95 316
PREWETT CREEK 070 Montana Fair 1931 95 316
MIZPAH CREEK 020 Montana Fair 1931 95 47
CLARK FORK RIVER 034 Montana Fair 1931 95 100
WILLOW CREEK 033 Montana Fair 1931 95 100
DRAINAGE 032 Montana Good 1931 95 100
DRAINAGE 025 Montana Fair 1931 95 100
LOST CREEK 037 Montana Fair 1931 95 916
ABBOT CREEK 063 Montana Fair 1931 95 100
BASIN CREEK 040 Montana Fair 1931 95 100
BIG PIPESTONE CREEK 062 Montana Fair 1931 95 608
COLBERT CREEK 063 Montana Fair 1931 95 608
NEMOTE CREEK 006 Montana Poor 1931 95 100
ROCK CREEK 013 Montana Fair 1931 95 150
TWELVEMILE CREEK 014 Montana Fair 1931 95 150
DODSON S. CNL SPLWAY 098 Montana Fair 1931 95 100
DRY FORK MARIAS 080 Montana Fair 1931 95 511
PONDERA CANAL 081 Montana Fair 1931 95 511
BERRY CREEK 024 Montana Fair 1931 95 100
COULEE CREEK 023 Montana Fair 1931 95 100
BOULDER RIVER 002 Montana Fair 1931 95 157
BRIDGER CREEK 040 Montana Fair 1931 95 344
BEAVER CREEK 115 Montana Poor 1931 95 100
ANTELOPE CREEK 019 Montana Fair 1931 95 100
FRED BURR CREEK Montana Fair 1931 95 1,695
FLINT CREEK Montana Fair 1931 95 1,144
RADER CREEK Montana Fair 1931 95 686
SPRAGUE COULEE Montana Poor 1931 95 229
WARM SPRINGS CREEK Montana Fair 1931 95 1,692
SPANISH CREEK Montana Fair 1931 95 8,952
DRAINAGE Montana Fair 1931 95 1,162
DAWSON CREEK Montana Poor 1932 94 100
BARING CREEK Montana Fair 1932 94 1,942
BLUEWATER CREEK 002 Montana Fair 1932 94 100

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