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 294

Fair

Over: COTTONWOOD CREEK

5M SW MARTINSDALE, Meagher, MT

Built 1948 Load: 20.9 t ADT: 220

I 90

Fair

Over: RR

0.6M W BONNER, Missoula, MT

Built 1963 Load: 20.9 t ADT: 6,035

S HIGGINS AVE

Fair

Over: CLARK FORK R-PED PATHS

MISSOULA-S HIGGINS AVE, Missoula, MT

Built 1962 Load: 20.9 t ADT: 11,130

SHIELDS RIVER RD

Fair

Over: FLATHEAD CREEK 009

NE WILSALL, Park, MT

Built 1955 Load: 20.9 t ADT: 100

US 89

Fair

Over: RR

5M NE LIVINGSTON, Park, MT

Built 1955 Load: 20.9 t ADT: 2,146

ASSINIBOINE RD

Fair

Over: ASSINIBOINE CREEK 068

7M N MALTA, Phillips, MT

Built 1985 Load: 20.9 t ADT: 29

MIDALE RD

Fair

Over: BEAVER CREEK 046

35M S MALTA, Phillips, MT

Built 1972 Load: 20.9 t ADT: 100

S 363

Fair

Over: DODSON SOUTH CANAL

1M SW MALTA, Phillips, MT

Built 1966 Load: 20.9 t ADT: 330

CONRAD DUPUYER RD

Fair

Over: DRY FORK MARIAS RIVER

10M E DUPUYER, Pondera, MT

Built 1966 Load: 20.9 t ADT: 53

COUNTY ROAD 201

Fair

Over: FOUR MILE CREEK 022

8M NW FAIRVIEW, Richland, MT

Built 1993 Load: 20.9 t ADT: 100

S 16

Fair

Over: MISSOURI RIVER

2M SE CULBERTSON, Richland, MT

Built 1988 Load: 20.9 t ADT: 963

IRR - US 2

Fair

Over: WOLF CREEK

1M W WOLF POINT, Roosevelt, MT

Built 1956 Load: 20.9 t ADT: 1,882

US 12

Fair

Over: ANDERSON CREEK

19M NW FORSYTH, Rosebud, MT

Built 1940 Load: 20.9 t ADT: 144

US 12

Fair

Over: RR

SW EDGE FORSYTH, Rosebud, MT

Built 1977 Load: 20.9 t ADT: 1,242

IRR - S 39

Fair

Over: RR

16M NW COLSTRIP, Rosebud, MT

Built 1983 Load: 20.9 t ADT: 782

WHITEPINE CR RD

Fair

Over: BEAVER CREEK 022

2 NW WHTE PINE, Sanders, MT

Built 1982 Load: 20.9 t ADT: 100

BEND RD

Fair

Over: THOMPSON RIVER 040

30M SW MARION, Sanders, MT

Built 1991 Load: 20.9 t ADT: 100

S 200

Fair

Over: CLARK FORK RIVER

PARADISE, Sanders, MT

Built 1997 Load: 20.9 t ADT: 2,835

I 90

Fair

Over: YELLOWSTONE RIVER

5.6M E REEDPOINT, Stillwater, MT

Built 1961 Load: 20.9 t ADT: 5,353

FRONTAGE ROAD 120

Fair

Over: VALLEY CREEK 048

1M W PARK CITY, Stillwater, MT

Built 1969 Load: 20.9 t ADT: 100

OLD US 10

Fair

Over: COVE DITCH 011

PARK CITY, Stillwater, MT

Built 1928 Load: 20.9 t ADT: 726

HINSDALE N RD

Fair

Over: CROW CREEK 043

30M N HINSDALE, Valley, MT

Built 1960 Load: 20.9 t ADT: 14

THIEL RD

Fair

Over: CLARKS FK YELLOWSTONE026

3M SE LAUREL, Yellowstone, MT

Built 1969 Load: 20.9 t ADT: 100

NO DATA ENTERED

Fair

Over: DEEP CREEK

DEEP CREEK, Deer Lodge, MT

Built 1966 Load: 21.1 t ADT: 75

NO DATA ENTERED

Fair

Over: HOGBACK CREEK

NO DATA ENTERED, Granite, MT

Built 2008 Load: 21.1 t ADT: 50

NFSR #251

Fair

Over: DRY WOLF CR

19 MI. SW OF STANFORD, Judith Basin, MT

Built 1976 Load: 21.1 t ADT: 50

RD 250

Fair

Over: TROUT CR

PIERCE-SUPERIOR, Mineral, MT

Built 1965 Load: 21.1 t ADT: 50

NO DATA ENTERED

Fair

Over: W F BITTERROOT

NO DATA ENTERED, Ravalli, MT

Built 1954 Load: 21.1 t ADT: 10

VICTOR CROSSING E

Fair

Over: BITTERROOT RIVER 019

1M E VICTOR, Ravalli, MT

Built 1982 Load: 21.1 t ADT: 100

NO DATA ENTERED

Fair

Over: BEAVER CREEK

NO DATA ENTERED, Sanders, MT

Built 1965 Load: 21.1 t ADT: 20

SO. FK. TETON RD.

Fair

Over: TETON RIVER

25 MI. NW OF CHOTEAU, MT., Teton, MT

Built 1944 Load: 21.1 t ADT: 16

FDR 1203

Fair

Over: TIE CREEK

TIE CR, Beaverhead, MT

Built 1964 Load: 21.4 t ADT: 15

RD 895

Fair

Over: SULLIVAN CREEK

SULLIVAN CR, Flathead, MT

Built 1952 Load: 21.4 t ADT: 40

NO DATA ENTERED

Fair

Over: CEDAR CR

CEDAR CR, Mineral, MT

Built 1935 Load: 21.4 t ADT: 50

I 94

Fair

Over: YELLOWSTONE RIVER

1M N FALLON, Prairie, MT

Built 1978 Load: 21.4 t ADT: 2,191

18131: MAIDEN ROCK

Fair

Over: Big Hole River

24 mi SW of Butte, MT, Silver Bow, MT

Built 1951 Load: 21.4 t ADT: 25

NITCHE RD

Fair

Over: ROSEBUD CREEK 029

2M SW ABSAROKEE, Stillwater, MT

Built 2003 Load: 21.4 t ADT: 100

SQUAW CREEK RD

Fair

Over: PRYOR CREEK 004

2M SE HUNTLEY, Yellowstone, MT

Built 1978 Load: 21.4 t ADT: 100

11TH LN

Fair

Over: GREENFIELD S CANAL 047

11M E FAIRFIELD, Cascade, MT

Built 2009 Load: 21.5 t ADT: 100

BOYD COONEY DAM RD

Fair

Over: ROCK CREEK 027

1M W BOYD, Carbon, MT

Built 1973 Load: 21.7 t ADT: 564

E ROSEBUD RD

Fair

Over: EAST ROSEBUD CREEK 018

2M SW ROSCOE, Carbon, MT

Built 1993 Load: 21.7 t ADT: 76

GORDON RD

Fair

Over: MUDDY CREEK 042

7M NW VAUGHN, Cascade, MT

Built 1973 Load: 21.7 t ADT: 70

NFSR 330

Fair

Over: LANDERS FORK

LANDERS FORK, Lewis and Clark, MT

Built 1977 Load: 21.7 t ADT: 21

WEST FORTINE ROAD

Fair

Over: FORTINE CR

FORTINE CR, Lincoln, MT

Built 1963 Load: 21.7 t ADT: 50

RD 4791

Fair

Over: GRANITE CR

LOWER GRANITE, Lincoln, MT

Built 1964 Load: 21.7 t ADT: 50

RD 367

Fair

Over: GRAVES CR

GRAVES VERMILLION, Sanders, MT

Built 1954 Load: 21.7 t ADT: 50

RD 7688

Fair

Over: W FK FISHTRAP

LOWER FISHTRAP RIDG, Sanders, MT

Built 1965 Load: 21.7 t ADT: 40

SHIPPE CANYON RD

Fair

Over: BIG MUDDY CREEK 032

2M S PLENTYWOOD, Sheridan, MT

Built 1970 Load: 21.7 t ADT: 159

WHISKEY RD

Fair

Over: BIG MUDDY CREEK 043

3M N MEDICINE LAKE, Sheridan, MT

Built 1978 Load: 21.7 t ADT: 71

MANN RD

Fair

Over: BIG MUDDY CREEK

SW PLENTYWOOD, Sheridan, MT

Built 1967 Load: 21.7 t ADT: 183

Showing 1,201-1,250 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.