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

S SHAWMUT RD

Fair

Over: FISH CREEK 002

12M W SHAWMUT, Golden Valley, MT

Built 1964 Load: 15.4 t ADT: 100

S 87

Fair

Over: MADISON RIVER

29M SE CAMERON, Madison, MT

Built 1961 Load: 15.4 t ADT: 1,394

LOZEAU CROSSOVR RD

Fair

Over: CLARK FORK 045

LOZEAU, Mineral, MT

Built 1944 Load: 15.4 t ADT: 217

SHIELDS RIVER RD

Fair

Over: SHIELDS RIVER 010

4M NE WILSALL, Park, MT

Built 1955 Load: 15.4 t ADT: 100

S 391-MOORHEAD RD

Fair

Over: DRAINAGE OVERFLOW

4M SW BROADUS, Powder River, MT

Built 1935 Load: 15.4 t ADT: 74

MELVILLE RD

Fair

Over: SWEET GRASS CREEK 01

W MELVILLE, Sweet Grass, MT

Built 1957 Load: 15.4 t ADT: 100

BOULDER RD

Fair

Over: BOULDER RIVER 002

19M S MCLEOD, Sweet Grass, MT

Built 1931 Load: 15.4 t ADT: 156

COUNTY ROAD 605

Fair

Over: IRRIGATION CANAL 107

6M E SACO, Valley, MT

Built 1950 Load: 15.4 t ADT: 100

13TH ST W

Fair

Over: BBWA CANAL 181

BILLINGS-13TH ST W, Yellowstone, MT

Built 1970 Load: 15.4 t ADT: 5,368

AMSTERDAM RD

Fair

Over: GALLATIN RIVER

3M SW BELGRADE, Gallatin, MT

Built 1951 Load: 15.6 t ADT: 2,207

NFSR #275

Fair

Over: ROCK CREEK

3 MI. N. OF CRYSTAL LAKE, Fergus, MT

Built 1938 Load: 15.9 t ADT: 50

FOREST ROAD

Fair

Over: SPOTTED BEAR RIVER

SPOTTED BEAR RANGER STA., Flathead, MT

Built 1967 Load: 15.9 t ADT: 130

TAMPICO RD

Fair

Over: MILK RIVER

2M W GLASGOW, Valley, MT

Built 1960 Load: 15.9 t ADT: 478

1ST RD S

Fair

Over: MILL COULEE CANAL 046

9M E FAIRFIELD, Cascade, MT

Built 2004 Load: 16.1 t ADT: 100

1-LANE ROAD

Fair

Over: WEST ROSEBUD CREEK

9 MILES SW OF ROSCOE, Carbon, MT

Built 1959 Load: 16.2 t ADT: 50

COUNTY LINE RD

Fair

Over: GREENFIELD CANAL 044

7M E FAIRFIELD, Cascade, MT

Built 1973 Load: 16.2 t ADT: 100

FDR 204

Fair

Over: MOOSE CREEK

4 MI NE OF 119/204 RD JCT, Meagher, MT

Built 1956 Load: 16.2 t ADT: 50

NO DATA ENTERED

Fair

Over: MONTURE CREEK

COTTONWOOD LAKES, Powell, MT

Built 1953 Load: 16.2 t ADT: 50

RD 7670

Fair

Over: BEATRICE CR

BEATRICE CR, Sanders, MT

Built 1959 Load: 16.2 t ADT: 50

NFSR #144

Fair

Over: NORTH FORK TETON RIVER

31 MI WESTERLY OF CHOTEAU, Teton, MT

Built 1965 Load: 16.2 t ADT: 65

SARPY BASIN RD

Fair

Over: E FORK SARPY CREEK 028

30M E HARDIN, Big Horn, MT

Built 1971 Load: 16.3 t ADT: 100

8 MILE RD

Fair

Over: MILK RIVER 078

5M SE ZURICH, Blaine, MT

Built 1930 Load: 16.3 t ADT: 100

N FORK RD

Fair

Over: PARADISE VALLEY CANAL037

5M SW ZURICH, Blaine, MT

Built 1933 Load: 16.3 t ADT: 28

WILLOW CREEK RD

Fair

Over: LITTLE BELT CREEK 003

14M E BELT, Cascade, MT

Built 1938 Load: 16.3 t ADT: 157

OLD US HWY 91

Fair

Over: MUDDY CREEK SLOUGH 111

ULM, Cascade, MT

Built 1923 Load: 16.3 t ADT: 100

N DENTON RD

Fair

Over: COFFEE CREEK 081

6M N DENTON, Fergus, MT

Built 1979 Load: 16.3 t ADT: 100

ROGERS LAKE RD

Fair

Over: ASHLEY CREEK 098

5M SE MARION, Flathead, MT

Built 1999 Load: 16.3 t ADT: 100

SPAULDING BR RD

Fair

Over: E GALLATIN RIVER 077

4M NE MANHATTAN, Gallatin, MT

Built 1997 Load: 16.3 t ADT: 100

GRAYLING CR RD

Fair

Over: GRAYLING CREEK 111

10M N WEST YELLOWSTONE, Gallatin, MT

Built 1977 Load: 16.3 t ADT: 100

S 59

Fair

Over: SAND CREEK

5M SE JORDAN, Garfield, MT

Built 1953 Load: 16.3 t ADT: 396

ROAD 100 N

Fair

Over: SAGE CREEK 022

10M N HINGHAM, Hill, MT

Built 1977 Load: 16.3 t ADT: 81

SINCLAIR CREEK RD

Fair

Over: SINCLAIR CREEK 126

2M NE EUREKA, Lincoln, MT

Built 1977 Load: 16.3 t ADT: 100

TOBACCO RD

Fair

Over: TOBACCO RIVER 144

SE EDGE EUREKA, Lincoln, MT

Built 1968 Load: 16.3 t ADT: 2,027

I 90

Fair

Over: ST. REGIS RVR-LOCAL RD

4.3M E DE BORGIA, Mineral, MT

Built 1979 Load: 16.3 t ADT: 7,352

BENCH RD

Fair

Over: GRANT CREEK 019

7M N MISSOULA, Missoula, MT

Built 1955 Load: 16.3 t ADT: 100

SECOND ST S-US 89

Fair

Over: YELLOWSTONE RIVER

GARDINER-SECOND ST S, Park, MT

Built 1930 Load: 16.3 t ADT: 4,728

TURNER CUTACROSS R

Fair

Over: WOODY ISLAND COULEE 074

20M NW LORING, Phillips, MT

Built 1991 Load: 16.3 t ADT: 13

SKYVIEW RD S

Fair

Over: NO NAME 070

6M E DUPUYER, Pondera, MT

Built 1960 Load: 16.3 t ADT: 100

DRY GULCH RD

Fair

Over: N FORK BLACKFOOT R 007

5M E OVANDO, Powell, MT

Built 1968 Load: 16.3 t ADT: 100

OLD HWY 10 E

Fair

Over: O`FALLON CREEK 043

1M W FALLON, Prairie, MT

Built 1948 Load: 16.3 t ADT: 504

QUAST LN

Fair

Over: SURPRISE DITCH 060

1M N CORVALLIS, Ravalli, MT

Built 1918 Load: 16.3 t ADT: 527

COUNTY ROAD 1010

Fair

Over: EAST FORK SHOTGUN 056

9M N BAINVILLE, Roosevelt, MT

Built 1988 Load: 16.3 t ADT: 100

US 12

Fair

Over: YELLOWSTONE RIVER

W EDGE FORSYTH, Rosebud, MT

Built 1958 Load: 16.3 t ADT: 718

BELLVIEW RD

Fair

Over: NORTH FORK WILLOW CR 066

16M W CHOTEAU, Teton, MT

Built 1986 Load: 16.3 t ADT: 100

I 94

Fair

Over: BIGHORN RIVER

0.6M W BIGHORN, Yellowstone, MT

Built 1978 Load: 16.3 t ADT: 2,580

S 80TH ST W

Fair

Over: CANYON CREEK 030

BILLINGS-S 80TH ST W, Yellowstone, MT

Built 2001 Load: 16.3 t ADT: 100

PINEVIEW RD

Fair

Over: BUFFALO CREEK 129

25M N CUSTER, Yellowstone, MT

Built 1966 Load: 16.3 t ADT: 100

NO DATA ENTERED

Fair

Over: BIRCH CR

BIRCH CR, Beaverhead, MT

Built 1953 Load: 16.5 t ADT: 40

FDR 3411

Fair

Over: BELT CREEK

MANY PINES CAMPGROUND, Cascade, MT

Built 1962 Load: 16.5 t ADT: 50

NFSR #275

Fair

Over: ROCK CREEK

5 MI NORTH OF CRYSTAL LK, Fergus, MT

Built 1954 Load: 16.5 t ADT: 50

Showing 901-950 of 5,122 bridges

Related

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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.