Bridge Safety in Montana

5,235 bridges — 388 Poor condition — avg age 47 years.

Bridge Inventory

Total Bridges5,235
Good Condition1,682
Fair Condition3,165
Poor Condition388
Oldest BridgeBuilt 1881
Average Age47 years

Condition Summary

% Good32.1%
% Fair60.5%
% Poor7.4%

Highest-Traffic Poor Condition Bridges in Montana

Poor condition bridges sorted by daily traffic — the most urgent safety concerns.

Bridge Condition Year Built ADT Length
INT RESERVE STREET Poor 1966 13,664
CLARK FORK RIVER Poor 1970 13,081
CLARK FORK RIVER Poor 1964 9,168
U1024-25-RR Poor 1960 8,576
U1025-RR Poor 1960 8,576
ABANDONED RR Poor 1969 8,575
FLATHEAD RIVER Poor 1955 8,310
NINE PIPE RESERVOIR Poor 1933 8,158
INT LINCOLN-I 15 Poor 1962 7,492
RR Poor 1973 5,992
RR Poor 1973 5,992
BIG CHERRY CREEK Poor 1976 5,295
INT W GARRISON-RR Poor 1979 5,232
YELLOWSTONE RIVER Poor 1957 5,017
CLEAR CREEK Poor 1973 4,317
SOUTH WILLOW CREEK Poor 1934 4,102
CLARK FORK RIVER Poor 1965 4,088
SEP ELIZABETH LN Poor 1965 4,088
YELLOWSTONE RIVER 170 Poor 1949 4,005
CLARK FORK RIVER Poor 1984 3,719

Oldest Bridges in Montana

Bridge Condition Year Built Age ADT
REEDERS ALLEY 001 Fair 1881 145 yrs 100
JEFFERSON RIVER 063 Poor 1894 132 yrs 100
DEARBORN RIVER 011 Fair 1896 130 yrs 31
JEFFERSON RIVER 004 Poor 1897 129 yrs 100
JEFFERSON RIVER 046 Fair 1898 128 yrs 87
ST REGIS RIVER Fair 1900 126 yrs 50
LYONS CREEK 032 Good 1900 126 yrs 100
LOCATE CREEK 045 Fair 1901 125 yrs 23
FLAT CREEK 036 Poor 1901 125 yrs 100
MADISON RIVER 046 Fair 1902 124 yrs 100

Bridge Safety in Montana

Bridge condition data for Montana comes from the FHWA National Bridge Inventory. All publicly accessible bridges with a span over 20 feet are inspected at least every 24 months by certified bridge inspectors.