State profile · Near national median SD

Montana bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Montana — drawn straight from the FHWA National Bridge Inventory.

5,122
Public bridges
28.3%
Good condition
6.7%
Poor condition
6.7%
Structurally deficient

Total Bridges

5,122

Public highway bridges in Montana

Good Condition

28.3%

1,447 bridges rated 7-9

-21.7pp vs 50% benchmark

Poor Condition

6.7%

343 bridges rated 0-4

Structurally Deficient

6.7%

343 bridges flagged for repair priority

-0.3pp vs national avg 7.0%

Montana vs national bridge condition

Montana — Good condition share 28.3%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Montana — Structurally deficient share 22.3%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Bridge inventory deck-condition mix — Montana (FHWA NBI)

Montana28.25068332682546%52.08902772354549%GoodFairPoorStructurally Deficient
Bridge inventory deck-condition mix — Montana (FHWA NBI)

Counties (56)

Beaverhead 217 Big Horn 136 Blaine 101 Broadwater 31 Carbon 77 Carter 39 Cascade 185 Chouteau 42 Custer 71 Daniels 32 Dawson 109 Deer Lodge 68 Fallon 35 Fergus 155 Flathead 195 Gallatin 207 Garfield 26 Glacier 68 Golden Valley 17 Granite 73 Hill 44 Jefferson 128 Judith Basin 48 Lake 111 Lewis and Clark 196 Liberty 11 Lincoln 190 Madison 84 McCone 44 Meagher 52 Mineral 152 Missoula 205 Musselshell 25 Park 124 Petroleum 26 Phillips 100 Pondera 96 Powder River 23 Powell 112 Prairie 46 Ravalli 149 Richland 96 Roosevelt 57 Rosebud 114 Sanders 116 Sheridan 66 Silver Bow 66 Stillwater 90 Sweet Grass 89 Teton 81 Toole 35 Treasure 26 Valley 103 Wheatland 26 Wibaux 24 Yellowstone 283

Montana vs nearby ranks

Adjacent states on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Montana on the same metric.

37

North Carolina

6.16% top marginal rate
Structure
Progressive
Burden @ $100K
$18,901

15

Hawaii

6.47% top marginal rate
Structure
Progressive
Burden @ $100K
$1,206
Selected

30

Montana

6.70% top marginal rate
Structure
Progressive
Burden @ $100K
$5,122

36

New York

6.90% top marginal rate
Structure
Progressive
Burden @ $100K
$19,132

21

Kentucky

7.06% top marginal rate
Structure
Progressive
Burden @ $100K
$14,554

Bridges Needing Most Attention in Montana

Six lowest-condition bridges in Montana, ranked by composite NBI rating. Each is inspected at least every 24 months.

HWY 91 N

Poor

Over: BIG HOLE RIVER 041

22M N DILLON, Beaverhead, MT

Built 1940 Load: 2.7 t ADT: 155

SLEEPY HOLLOW LN

Structurally Deficient

Over: PRICKLY PEAR CREEK

3 M S MONTANA CITY, Jefferson, MT

Built 2010 Load: 2.7 t ADT: 100

CARBINE RD

Poor

Over: PABLO CANAL 026

4M W PABLO, Lake, MT

Built 1986 Load: 2.7 t ADT: 100

BOY SCOUT RD

Poor

Over: CLEARWATER RIVER 082

2M NW SEELEY LAKE, Missoula, MT

Built 1938 Load: 2.7 t ADT: 100

ASHLEY LAKE RD

Poor

Over: PABLO FEEDER CANAL 045

5M NE ST IGNATIUS, Lake, MT

Built 1965 Load: 3.0 t ADT: 100

SHEEP CR RD

Structurally Deficient

Over: SHEEP CREEK 097

12M S CASCADE, Cascade, MT

Built 1950 Load: 3.6 t ADT: 68

All Bridges in Montana

COUNTY ROAD 304

Fair

Over: PENNEL CREEK 036

5M NW ISMAY, Custer, MT

Built 1982 Load: 36.2 t ADT: 18

I 15

Fair

Over: SEP RR

1.2M N MONIDA, Beaverhead, MT

Built 2015 Load: 36.3 t ADT: 1,643

CO RD 002 FH 73

Fair

Over: WISE RIVER 019

17M S WISE RIVER, Beaverhead, MT

Built 1987 Load: 36.3 t ADT: 289

S 43

Fair

Over: WISE RIVER

WISE RIVER, Beaverhead, MT

Built 1970 Load: 36.3 t ADT: 576

NO DATA ENTERED

Fair

Over: WEST FORK ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 1972 Load: 36.3 t ADT: 50

CHANCE RD

Fair

Over: CLARKS FK YELLOWSTNE 004

8M S BELFRY, Carbon, MT

Built 2004 Load: 36.3 t ADT: 100

S 59

Fair

Over: PUMPKIN CREEK

42M SE MILES CITY, Custer, MT

Built 2003 Load: 36.3 t ADT: 673

MARSH RD

Fair

Over: CABIN CREEK 088

20M S GLENDIVE, Dawson, MT

Built 2003 Load: 36.3 t ADT: 100

COUNTY ROAD 154

Fair

Over: LITTLE BEAVER CREEK 015

8M SW WEBSTER, Fallon, MT

Built 2014 Load: 36.3 t ADT: 100

FOREST ROAD

Fair

Over: TIN CREEK

WEST SIDE SOUTHFORK, Flathead, MT

Built 1973 Load: 36.3 t ADT: 80

FOREST ROAD

Fair

Over: EMERY CREEK

SOUTH FORK FLATHEAD RD, Flathead, MT

Built 1965 Load: 36.3 t ADT: 250

US 93

Fair

Over: STILLWATER RIVER

2M NW KALISPELL, Flathead, MT

Built 1996 Load: 36.3 t ADT: 25,386

I 90

Fair

Over: JEFFERSON RIVER OVERFLOW

THREE FORKS, Gallatin, MT

Built 1969 Load: 36.3 t ADT: 8,465

IRR BIA RTE 10

Fair

Over: WILLOW CREEK

IN BROWNING - AGENCY ROAD, Glacier, MT

Built 2000 Load: 36.3 t ADT: 1,120

I 15

Fair

Over: PRICKLY PEAR CREEK

1.2M S CLANCY, Jefferson, MT

Built 1969 Load: 36.3 t ADT: 5,910

I 90

Fair

Over: SEP COUNTY ROAD

7.4M E CARDWELL, Jefferson, MT

Built 1969 Load: 36.3 t ADT: 5,527

CATARACT CREEK RD

Fair

Over: CATARACT CREEK 048

3M N BASIN, Jefferson, MT

Built 1939 Load: 36.3 t ADT: 100

S 435

Fair

Over: ELK CREEK

6M SW AUGUSTA, Lewis and Clark, MT

Built 1958 Load: 36.3 t ADT: 33

FARM TO MARKET RD

Fair

Over: LIBBY CREEK

5M S LIBBY, Lincoln, MT

Built 1962 Load: 36.3 t ADT: 939

S 287

Fair

Over: WISCONSIN CREEK

3M NW SHERIDAN, Madison, MT

Built 1999 Load: 36.3 t ADT: 1,866

FDR 836

Fair

Over: SHEEP CREEK

0.1 MI SE US89/RD.836 JCT, Meagher, MT

Built 1968 Load: 36.3 t ADT: 50

I 90

Fair

Over: CLARK FORK RIVER

1.9M E SUPERIOR, Mineral, MT

Built 1960 Load: 36.3 t ADT: 3,776

0427: MCNAMARA ROA

Fair

Over: Blackfoot River

21 mi E of Missoula, MT, Missoula, MT

Built 1964 Load: 36.3 t ADT: 25

KONA RANCH RD

Fair

Over: CLARK FORK 011

8M W MISSOULA, Missoula, MT

Built 1987 Load: 36.3 t ADT: 100

I-90

Fair

Over: PETERSON CREEK

5M W SPRINGDALE, Park, MT

Built 2012 Load: 36.3 t ADT: 5,692

COUNTY ROAD 029

Fair

Over: DODSON NORTH CANAL 037

1M W DODSON, Phillips, MT

Built 1990 Load: 36.3 t ADT: 41

IRR - US 2

Fair

Over: PEOPLES CREEK OVERFLOW

6M W DODSON, Phillips, MT

Built 1972 Load: 36.3 t ADT: 1,281

US 2

Fair

Over: RR

4M E DODSON, Phillips, MT

Built 2008 Load: 36.3 t ADT: 1,189

CB ROUTE RD

Fair

Over: BR MAIN CANAL 036

3M NE FALLON, Prairie, MT

Built 1938 Load: 36.3 t ADT: 80

SKALKAHO HWY

Fair

Over: HEDGES CANAL 012

3M SE HAMILTON, Ravalli, MT

Built 1941 Load: 36.3 t ADT: 1,703

US 212

Fair

Over: OTTER CREEK

EAST EDGE ASHLAND, Rosebud, MT

Built 2013 Load: 36.3 t ADT: 2,211

NYE RD-S 419

Fair

Over: E ROSEBUD CREEK OVERFLOW

3M NE FISHTAIL, Stillwater, MT

Built 1992 Load: 36.3 t ADT: 1,544

15TH LN NW

Fair

Over: TETON CANAL 030

4M N BYNUM, Teton, MT

Built 1984 Load: 36.3 t ADT: 100

BILLINGSLEY RD

Fair

Over: VANDALIA SOUTH CANAL 076

10M NW GLASGOW, Valley, MT

Built 2012 Load: 36.3 t ADT: 100

US 310

Fair

Over: RR

1M S LAUREL, Yellowstone, MT

Built 2014 Load: 36.3 t ADT: 12,460

YELLOW WATER RD

Fair

Over: ELK CREEK 136

7 M SE GRASSRANGE, Fergus, MT

Built 1974 Load: 36.5 t ADT: 100

IRR BIA RTE 10

Fair

Over: WILLOW CREEK

IN BROWING ON ALL CHIEFS, Glacier, MT

Built 2000 Load: 36.5 t ADT: 1,120

NO DATA ENTERED

Fair

Over: E FK LAMARCHE CR

E FK LAMARCHE CR, Deer Lodge, MT

Built 1980 Load: 36.6 t ADT: 5

4554 GOAT CR. RD.

Fair

Over: S FK CALLAHAN CR

0.1 MI. FROM JCT WITH 414, Lincoln, MT

Built 1976 Load: 36.6 t ADT: 20

BIG CREEK RD - NF-

Fair

Over: BIG CREEK 062

9M SW EMIGRANT, Park, MT

Built 1938 Load: 36.7 t ADT: 100

ROAD

Fair

Over: RACETRACK CR

RACETRACK CREEK, Powell, MT

Built 1985 Load: 36.9 t ADT: 40

I 90

Fair

Over: UPPER DEER CREEK

2.5M W GREYCLIFF, Sweet Grass, MT

Built 1980 Load: 37.0 t ADT: 6,415

I 90

Fair

Over: UPPER DEER CREEK

2.5M W GREYCLIFF, Sweet Grass, MT

Built 1980 Load: 37.0 t ADT: 6,415

LLOYD RD

Fair

Over: COW CREEK 091

12M SW CLEVELAND, Blaine, MT

Built 1933 Load: 37.1 t ADT: 47

SALT CREEK RD

Fair

Over: DOG CREEK 054

N SUFFOLK, Fergus, MT

Built 1962 Load: 37.1 t ADT: 100

SHIELDS RIVER RD E

Fair

Over: FIDDLE CREEK 024

7M SE CLYDE PARK, Park, MT

Built 1950 Load: 37.1 t ADT: 100

FAR WEST RD

Fair

Over: LITTLE BITTERROOT 060

13M N CAMAS, Sanders, MT

Built 1991 Load: 37.1 t ADT: 100

I 15

Fair

Over: SEP RR

1.9M S LIMA, Beaverhead, MT

Built 1980 Load: 37.2 t ADT: 1,643

S 89

Fair

Over: RR

SOUTH DILLON, Beaverhead, MT

Built 1983 Load: 37.2 t ADT: 1,770

TURNER RD

Fair

Over: BUCKLEY COULEE

1M N HARLEM, Blaine, MT

Built 1940 Load: 37.2 t ADT: 397

Showing 2,901-2,950 of 5,122 bridges

Related

All states → | National rankings → | Understanding conditions → | SD bridges explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.