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

I 90 EB

Fair

Over: RR

9.3M E SUPERIOR, Mineral, MT

Built 1967 Load: 33.6 t ADT: 3,776

I 90

Fair

Over: CLARK FORK RIVER

9.3M W ALBERTON, Mineral, MT

Built 1981 Load: 33.6 t ADT: 4,036

ELK FLATS RD

Fair

Over: ELK CREEK 115

W OF CONDON, Missoula, MT

Built 1996 Load: 33.6 t ADT: 100

S 540 - E RIVER RD

Fair

Over: YELLOWSTONE RIVER

4M S LIVINGSTON, Park, MT

Built 1921 Load: 33.6 t ADT: 1,138

S 16

Fair

Over: USBR MAIN CANAL

SAVAGE, Richland, MT

Built 1974 Load: 33.6 t ADT: 2,407

S 200

Fair

Over: USRS CANAL

3M SW SIDNEY, Richland, MT

Built 1988 Load: 33.6 t ADT: 1,547

CARTERSVILLE RD

Fair

Over: SAND CREEK 042

8M NE ROSEBUD, Rosebud, MT

Built 2012 Load: 33.6 t ADT: 138

5TH AVE S

Fair

Over: CLARK FORK 085

1M SW PLAINS, Sanders, MT

Built 1975 Load: 33.6 t ADT: 100

I 15

Fair

Over: RR-LOCAL

BUTTE, Silver Bow, MT

Built 2010 Load: 33.6 t ADT: 6,807

US 191

Fair

Over: OTTER CREEK

4M S MELVILLE, Sweet Grass, MT

Built 2004 Load: 33.6 t ADT: 657

S DIVISION LN

Fair

Over: BIG COULEE 059

4M S FAIRFIELD, Teton, MT

Built 1976 Load: 33.6 t ADT: 100

CANAL RD

Fair

Over: BRAZIL CREEK 079

3M W GLASGOW, Valley, MT

Built 2013 Load: 33.6 t ADT: 100

IRR - US 2

Fair

Over: OSWEGO CREEK

1M N OSWEGO, Valley, MT

Built 1973 Load: 33.6 t ADT: 1,405

NEIBAUER RD

Fair

Over: BIG DITCH 038

4M NE LAUREL, Yellowstone, MT

Built 1960 Load: 33.6 t ADT: 137

US 310

Fair

Over: RR

1M S LAUREL, Yellowstone, MT

Built 2015 Load: 33.6 t ADT: 6,230

PARK RD

Fair

Over: FORT BELKNAP CANAL 001

N ZURICH, Blaine, MT

Built 1958 Load: 33.7 t ADT: 100

S 86-BRIDGER DR

Fair

Over: EAST GALLATIN RIVER

1M N BOZEMAN, Gallatin, MT

Built 1984 Load: 33.7 t ADT: 8,393

BROADHURST RD

Fair

Over: PONDERA COULEE 013

4M S TIBER DAM, Liberty, MT

Built 1977 Load: 33.7 t ADT: 100

NO DATA ENTERED

Fair

Over: BURNT FORK BTTR RIV

NO DATA ENTERED, Ravalli, MT

Built 1967 Load: 33.7 t ADT: 5

I 15

Fair

Over: BEAVERHEAD RIVER

5M N CLARK CANYON DAM, Beaverhead, MT

Built 1964 Load: 34.0 t ADT: 2,836

US 287

Fair

Over: CABIN CREEK

23M NW WEST YELLOWSTONE, Gallatin, MT

Built 1964 Load: 34.0 t ADT: 945

NO DATA ENTERED

Fair

Over: ROSS FORK

ROSS FORK, Granite, MT

Built 1961 Load: 34.0 t ADT: 40

I 15

Fair

Over: PRICKLY PEAR CREEK

0.6M S CLANCY, Jefferson, MT

Built 1969 Load: 34.0 t ADT: 5,910

RD 889

Fair

Over: WARD CREEK

WARD CR, Mineral, MT

Built 1960 Load: 34.0 t ADT: 50

EXPO PKWY

Fair

Over: GRANT CREEK 117

MISSOULA-EXPO PKWY, Missoula, MT

Built 1997 Load: 34.0 t ADT: 100

NO DATA ENTERED

Fair

Over: BLUE JOINT

NO DATA ENTERED, Ravalli, MT

Built 1960 Load: 34.0 t ADT: 50

WILLOW CREEK RD

Fair

Over: WILLOW CREEK 061

7M SW ROBERTS, Carbon, MT

Built 1942 Load: 34.3 t ADT: 100

337 BOULDER/BASIN

Fair

Over: BASIN CREEK

6 MILES FROM JCT W/92, Lincoln, MT

Built 1968 Load: 34.3 t ADT: 50

RD 601

Fair

Over: QUARTZ CREEK

LOWER QUARTZ, Lincoln, MT

Built 1976 Load: 34.3 t ADT: 50

NFSR 119

Fair

Over: MOOSE CREEK

4.4 MI WEST US89/119 JCT, Meagher, MT

Built 1971 Load: 34.3 t ADT: 50

RD 342

Fair

Over: DRY CR

DRY CR, Mineral, MT

Built 1959 Load: 34.3 t ADT: 50

2801: CHAMBERLAIN

Fair

Over: East Fork Chamberlain Cr

38 MI W of Missoula, MT, Powell, MT

Built 2008 Load: 34.3 t ADT: 25

L ST

Fair

Over: E GALLATIN RIVER 091

NE BOZEMAN, Gallatin, MT

Built 2001 Load: 34.4 t ADT: 1,750

CATARACT CREEK RD

Fair

Over: CATARACT CREEK 034

1M N BASIN, Jefferson, MT

Built 1967 Load: 34.4 t ADT: 100

OTTER CREEK RD

Fair

Over: TEN MILE CREEK 009

11M SE MELVILLE, Sweet Grass, MT

Built 1977 Load: 34.4 t ADT: 133

SUSIE CREEK RD

Fair

Over: BOULDER RIVER 045

1M S MCLEOD, Sweet Grass, MT

Built 1960 Load: 34.4 t ADT: 100

I 15

Fair

Over: RED ROCK RIVER

6.2M S CLARK CANYON DAM, Beaverhead, MT

Built 1962 Load: 34.5 t ADT: 2,089

CO RD 002 FH 73

Fair

Over: WISE RIVER 018

18M S WISE RIVER, Beaverhead, MT

Built 1987 Load: 34.5 t ADT: 289

CASTNER FALLS RD

Fair

Over: BIRD CREEK 038

5M E CASCADE, Cascade, MT

Built 1938 Load: 34.5 t ADT: 100

POWDER RIVER RD

Fair

Over: ASH CREEK 017

29M SE LOCATE, Custer, MT

Built 1983 Load: 34.5 t ADT: 31

S 248

Fair

Over: W FK POPLAR RV OVERFLOW

1M E RICHLAND, Daniels, MT

Built 1948 Load: 34.5 t ADT: 193

S 248

Fair

Over: MARTIN COULEE

1M E RICHLAND, Daniels, MT

Built 1948 Load: 34.5 t ADT: 193

BAD ROUTE RD

Fair

Over: BUFFALO RAPIDS CANAL 015

7M NE FALLON, Dawson, MT

Built 1977 Load: 34.5 t ADT: 100

I 90

Fair

Over: LOST CREEK

2.5M N WARM SPRINGS, Deer Lodge, MT

Built 1978 Load: 34.5 t ADT: 5,740

US 191

Fair

Over: WARM SPRINGS CREEK

5M SW HILGER, Fergus, MT

Built 2011 Load: 34.5 t ADT: 841

WINIFRED HWY

Fair

Over: DOG CREEK

CHRISTINA, Fergus, MT

Built 1954 Load: 34.5 t ADT: 382

SPRING PRAIRIE RD

Fair

Over: STILLWATER RIVER 088

8M NW KALISPELL, Flathead, MT

Built 1986 Load: 34.5 t ADT: 100

IRR - US 2

Fair

Over: STILLWATER RIVER

1M NE KALISPELL, Flathead, MT

Built 1966 Load: 34.5 t ADT: 13,399

IRR - US 2

Fair

Over: RR

14M NW ESSEX, Flathead, MT

Built 1956 Load: 34.5 t ADT: 2,119

I 90

Fair

Over: MADISON RIVER OVERFLOW

2.5M E THREE FORKS, Gallatin, MT

Built 1963 Load: 34.5 t ADT: 9,524

Showing 2,751-2,800 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.