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

SR 117

Poor

Over: MISSOURI RIVER OVERFLOW

1M N FORT PECK, Valley, MT

Built 1950 Load: 25.4 t ADT: 559

NFSR 9229

Poor

Over: WOOD CREEK

WOOD CREEK, Lewis and Clark, MT

Built 1967 Load: 26.2 t ADT: 50

OLD US HWY 91

Poor

Over: LITTLE MUDDY CREEK 090

6M N CASCADE, Cascade, MT

Built 1923 Load: 26.3 t ADT: 100

US 191

Poor

Over: MISSOURI RIVER

29M NE ROY, Fergus, MT

Built 1959 Load: 26.3 t ADT: 622

I 15 FRONTAGE RD

Poor

Over: CATARACT CREEK 030

1M E BASIN, Jefferson, MT

Built 1933 Load: 26.3 t ADT: 100

I 90

Poor

Over: CLARK FORK RIVER

9.3M W ALBERTON, Mineral, MT

Built 1965 Load: 26.3 t ADT: 4,036

BIG SWAMP CR RD

Poor

Over: BIG SWAMP CR

BIG SWAMP CR, Beaverhead, MT

Built 1968 Load: 26.6 t ADT: 15

SWAMP CR ROAD

Poor

Over: BIG SWAMP CR

BIG SWAMP CR, Beaverhead, MT

Built 1968 Load: 26.6 t ADT: 15

CLARENCE CR RD.

Poor

Over: CLARENCE CR

CLARENCE CR, Lincoln, MT

Built 1977 Load: 26.6 t ADT: 50

RUBY RD

Poor

Over: COTTONWOOD CR

COTTONWOOD CR, Madison, MT

Built 1954 Load: 26.6 t ADT: 50

RD 36-B

Poor

Over: WOLF CR

KELSEY CR NEAR MP21 ON 36, Lincoln, MT

Built 1960 Load: 26.9 t ADT: 50

RD 352

Poor

Over: TWELVEMILE CREEK

HENDERSON-THOMPSON, Mineral, MT

Built 1955 Load: 26.9 t ADT: 50

FLYNN LN

Poor

Over: BROADWATER MISSOURI 006

5M N TOSTON, Broadwater, MT

Built 1976 Load: 27.2 t ADT: 100

IRR - US 2

Poor

Over: RR

10M SE WEST GLACIER, Flathead, MT

Built 1956 Load: 27.2 t ADT: 2,119

CHURCHILL RD

Poor

Over: CAMP CREEK

2M N AMSTERDAM, Gallatin, MT

Built 1949 Load: 27.2 t ADT: 1,877

MARSHALL CREEK RD

Poor

Over: ROCK CREEK

14M W PHILIPSBURG, Granite, MT

Built 1959 Load: 27.2 t ADT: 158

JACK CREEK RD

Poor

Over: JACK CREEK 028

8M E ENNIS, Madison, MT

Built 1952 Load: 27.2 t ADT: 175

VICTOR CROSSING E

Poor

Over: BITTERROOT RIVER 017

2M E VICTOR, Ravalli, MT

Built 1984 Load: 27.2 t ADT: 100

OLD HWY 10 E

Poor

Over: SMITH CREEK 053

1M W FORSYTH, Rosebud, MT

Built 1928 Load: 27.2 t ADT: 599

RD 2358

Poor

Over: WOLF CREEK

NEAR JCT W/RD 36 MP 10.3, Lincoln, MT

Built 1969 Load: 27.5 t ADT: 50

TAYLOR FORK ROAD

Poor

Over: WAPITI CREEK

TAYLOR FORK, Gallatin, MT

Built 1954 Load: 27.9 t ADT: 50

US 2

Poor

Over: DRAINAGE

ZURICH, Blaine, MT

Built 1940 Load: 28.1 t ADT: 2,067

LODGE CREEK RD

Poor

Over: FORT BELKNAP CANAL

1M NE CHINOOK, Blaine, MT

Built 1952 Load: 28.1 t ADT: 100

S 7

Poor

Over: DRAINAGE

1M NE EKALAKA, Carter, MT

Built 1940 Load: 28.1 t ADT: 470

UPPER FORD RD

Poor

Over: E FORK YAAK RIVER 151

13M NE YAAK, Lincoln, MT

Built 1953 Load: 28.1 t ADT: 100

I 90

Poor

Over: CLARK FORK RIVER

6.2M E ALBERTON, Missoula, MT

Built 1964 Load: 28.1 t ADT: 9,050

IRR BIA RTE 191

Poor

Over: TWO MEDICINE CREEK

BELOW LWR 2 MEDICINE DAM, Glacier, MT

Built 1969 Load: 28.4 t ADT: 50

NO DATA ENTERED

Poor

Over: ROCK CR

NO DATA ENTERED, Ravalli, MT

Built 1970 Load: 28.8 t ADT: 136

MINER LAKE RD

Poor

Over: GOVERNOR CREEK 092

1M SW JACKSON, Beaverhead, MT

Built 1951 Load: 29.0 t ADT: 100

US 191

Poor

Over: BOX ELDER CREEK

2M E ROY, Fergus, MT

Built 1942 Load: 29.0 t ADT: 287

S 200

Poor

Over: BRIGGS COULEE

8M NE GRASS RANGE, Fergus, MT

Built 1930 Load: 29.0 t ADT: 612

I 15 FRONTAGE RD

Poor

Over: BASIN CREEK 041

BASIN, Jefferson, MT

Built 1985 Load: 29.0 t ADT: 100

ALLISON RD

Poor

Over: PABLO FEEDER CANAL 046

3M NE ST IGNATIUS, Lake, MT

Built 1960 Load: 29.0 t ADT: 100

COUNTY ROAD 641

Poor

Over: SHEEP CREEK 002

6M NW MCCABE, Roosevelt, MT

Built 1986 Load: 29.0 t ADT: 9

US 12

Poor

Over: DRAINAGE

18M NW FORSYTH, Rosebud, MT

Built 1938 Load: 29.0 t ADT: 226

S 200

Poor

Over: CLARK FORK RIVER

1M W THOMPSON FALLS, Sanders, MT

Built 1960 Load: 29.0 t ADT: 2,436

RD 352

Poor

Over: TWELVEMILE CREEK

HENDERSON-THOMPSON, Mineral, MT

Built 1955 Load: 29.2 t ADT: 50

REGINA RD

Poor

Over: TELEGRAPH CREEK 040

47M S MALTA, Phillips, MT

Built 1940 Load: 29.8 t ADT: 100

W RESERVE DR

Poor

Over: WHITEFISH RIVER

2M N KALISPELL, Flathead, MT

Built 1983 Load: 29.9 t ADT: 100

BEAR GULCH RD

Poor

Over: CLARK FORK RIVER 002

1M NE BEARMOUTH, Granite, MT

Built 1986 Load: 29.9 t ADT: 128

S 200

Poor

Over: CEMETERY COULEE

14M W BROCKWAY, McCone, MT

Built 1939 Load: 29.9 t ADT: 1,012

HWY 10 W

Poor

Over: NINEMILE SLIDE 026

3M W HUSON, Missoula, MT

Built 1947 Load: 29.9 t ADT: 140

S 244

Poor

Over: YELLOW WATER CR-ELK CR

5M S WINNETT, Petroleum, MT

Built 1948 Load: 29.9 t ADT: 232

IRR - S 24

Poor

Over: EAST FORK CHERRY CREEK

6M NE GLASGOW, Valley, MT

Built 1948 Load: 29.9 t ADT: 988

338 PETE CREEK RD

Poor

Over: WEST FORK YAAK RIVER

JUST PAST JCT WITH 5902, Lincoln, MT

Built 1987 Load: 30.1 t ADT: 50

IRR BIA RTE 226

Poor

Over: BLACK CANYON CREEK

51.5 KM SW OF LODGE GRASS, Big Horn, MT

Built 1965 Load: 30.3 t ADT: 5

RD 388

Poor

Over: CEDAR CR

SNOWSHOE PASS, Mineral, MT

Built 1954 Load: 30.5 t ADT: 50

FINLEY CR RD

Poor

Over: PLACID CR

FINLEY CR, Missoula, MT

Built 1959 Load: 30.5 t ADT: 50

S 7

Poor

Over: COLLINS CREEK

6M NE EKALAKA, Carter, MT

Built 1940 Load: 30.8 t ADT: 390

US 89 FH 32

Poor

Over: BELT CREEK

9M S BELT, Cascade, MT

Built 1968 Load: 30.8 t ADT: 1,144

Showing 4,951-5,000 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.