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Montana Bridges

5,117 bridges across 56 counties

Bridge Map

Summary

Total Bridges:5,117
Good Condition:1,565 (31%)
Fair Condition:3,199 (63%)
Poor Condition:353 (7%)
Average Age:48.3 years
Counties:56

Bridge Condition Distribution

Good
Fair
Poor
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Bridge Types

Bridge TypeCountPercentage
Stringer/Multi-beam or Girder3,35165.5%
Tee Beam73014.3%
Slab3506.8%
Culvert3466.8%
Truss - Thru1072.1%
Channel Beam1022.0%
Girder and Floorbeam System791.5%
Box Beam or Girders - Multiple130.3%
Arch - Deck130.3%
Truss - Deck70.1%
Frame60.1%
Other50.1%
Box Beam or Girders - Single or Spread30.1%
Unknown20.0%
Suspension10.0%
Segmental Box Girder10.0%
Arch - Thru10.0%

Bridge Age Distribution

Bridges Built Over Time

Notable Bridges in Montana

Most Trafficked Bridges

CLARK FORK R FLOOD PLAIN

Fair

County 063, Montana

Daily Traffic: 36,321 vehicles

CLARK FORK RIVER

Fair

County 063, Montana

Daily Traffic: 36,321 vehicles

BBWA CANAL

Fair

County 111, Montana

Daily Traffic: 31,207 vehicles

Oldest Bridges

REEDERS ALLEY 001

Fair

County 049, Montana

Built in 1881 (145 years old)

JEFFERSON RIVER 063

Poor

County 031, Montana

Built in 1894 (132 years old)

DEARBORN RIVER 011

Fair

County 049, Montana

Built in 1896 (130 years old)

Longest Bridges

KOOCANUSA RESERVOIR

Fair

County 053, Montana

Length: 10.0 meters

MISSOURI RIVER-U5205-RR

Fair

County 013, Montana

Length: 10.0 meters

MISSOURI RIVER-U5205-RR

Fair

County 013, Montana

Length: 10.0 meters

Recently Built Bridges

View all
DRAINAGE-STOCKPASSGood

County 033 • Built in 2023

PADEN COULEEGood

County 033 • Built in 2023

BEAVER CREEKGood

County 071 • Built in 2023

COTTONWOOD CREEKGood

County 025 • Built in 2023

MT Power RR SpurGood

County 111 • Built in 2023

Yellowstone RiverGood

County 111 • Built in 2023

Rock CreekGood

County 009 • Built in 2023

Rock CreekGood

County 009 • Built in 2023

HIGHWOOD CREEK 040Good

County 015 • Built in 2023

SHEEP CREEKGood

County 017 • Built in 2023

Counties in Montana

56 counties
Beaverhead County
216 bridges
Big Horn County
135 bridges
Blaine County
101 bridges
Broadwater County
31 bridges
Carbon County
77 bridges
Carter County
39 bridges
Cascade County
185 bridges
Chouteau County
42 bridges
Custer County
71 bridges
Daniels County
32 bridges
Dawson County
109 bridges
Deer Lodge County
68 bridges
Fallon County
34 bridges
Fergus County
155 bridges
Flathead County
195 bridges
Gallatin County
207 bridges
Garfield County
26 bridges
Glacier County
68 bridges
Golden Valley County
17 bridges
Granite County
73 bridges
Hill County
44 bridges
Jefferson County
128 bridges
Judith Basin County
48 bridges
Lake County
111 bridges
Lewis and Clark County
196 bridges
Liberty County
11 bridges
Lincoln County
190 bridges
Madison County
84 bridges
McCone County
44 bridges
Meagher County
52 bridges
Mineral County
152 bridges
Missoula County
205 bridges
Musselshell County
25 bridges
Park County
124 bridges
Petroleum County
26 bridges
Phillips County
100 bridges
Pondera County
96 bridges
Powder River County
23 bridges
Powell County
112 bridges
Prairie County
46 bridges
Ravalli County
147 bridges
Richland County
96 bridges
Roosevelt County
57 bridges
Rosebud County
114 bridges
Sanders County
116 bridges
Sheridan County
66 bridges
Silver Bow County
66 bridges
Stillwater County
90 bridges
Sweet Grass County
89 bridges
Teton County
81 bridges
Toole County
35 bridges
Treasure County
26 bridges
Valley County
103 bridges
Wheatland County
26 bridges
Wibaux County
24 bridges
Yellowstone County
283 bridges