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

US 287

Fair

Over: SOUTH WILLOW CREEK

HARRISON, Madison, MT

Built 1934 Load: 29.9 t ADT: 4,026

MT 41

Fair

Over: BEAVERHEAD RIVER

TWIN BRIDGES, Madison, MT

Built 1949 Load: 29.9 t ADT: 2,773

S 84

Fair

Over: CHERRY CREEK

9M NE NORRIS, Madison, MT

Built 1952 Load: 29.9 t ADT: 2,446

S 200S

Fair

Over: BUFFALO SPRING CREEK

4M SE CIRCLE, McCone, MT

Built 1966 Load: 29.9 t ADT: 922

S 252-WELDON RD

Fair

Over: DRAINAGE

14M NW CIRCLE, McCone, MT

Built 1955 Load: 29.9 t ADT: 57

US 12

Fair

Over: N FORK MUSSELSHELL R

11M NW TWO DOT, Meagher, MT

Built 2014 Load: 29.9 t ADT: 499

I 90

Fair

Over: ST. REGIS RIVER

ST. REGIS, Mineral, MT

Built 1983 Load: 29.9 t ADT: 3,513

I 90

Fair

Over: CLARK FORK RIVER

10.5M E SUPERIOR, Mineral, MT

Built 1967 Load: 29.9 t ADT: 3,776

PACKER CREEK RD

Fair

Over: ST REGIS RIVER 007

SALTESE, Mineral, MT

Built 1957 Load: 29.9 t ADT: 100

I 90

Fair

Over: RR

1.9M W CLINTON, Missoula, MT

Built 1963 Load: 29.9 t ADT: 5,554

W NINEMILE RD

Fair

Over: NINEMILE CREEK 029

12M NW FRENCHTOWN, Missoula, MT

Built 1972 Load: 29.9 t ADT: 477

US 12

Fair

Over: CURRANT CREEK

7M SW ROUNDUP, Musselshell, MT

Built 1936 Load: 29.9 t ADT: 438

MAIN BOULDER RD

Fair

Over: FOUR MILE CREEK 039

30M S SPRINGDALE, Park, MT

Built 1938 Load: 29.9 t ADT: 156

S 200

Fair

Over: BOX ELDER CREEK

8M E WINNETT, Petroleum, MT

Built 1953 Load: 29.9 t ADT: 630

CONTENT RD

Fair

Over: BEAVER CREEK 052

26M SE MALTA, Phillips, MT

Built 1983 Load: 29.9 t ADT: 100

S 484 FH 51

Fair

Over: OTTER CREEK

27M SE ASHLAND, Powder River, MT

Built 1999 Load: 29.9 t ADT: 35

S FRONTAGE RD 011

Fair

Over: POWELL CREEK 063

2M S DEER LODGE, Powell, MT

Built 1930 Load: 29.9 t ADT: 899

S 16

Fair

Over: DUNLAP CREEK

1M N SAVAGE, Richland, MT

Built 1974 Load: 29.9 t ADT: 2,407

IRR - US 2

Fair

Over: POPLAR RIVER

W POPLAR, Roosevelt, MT

Built 2000 Load: 29.9 t ADT: 2,725

IRR - S 251

Fair

Over: HAY CREEK

26M NE POPLAR, Roosevelt, MT

Built 1950 Load: 29.9 t ADT: 87

HAMMOND VALLEY RD

Fair

Over: BIG PORCUPINE CR 034

8M NW FORSYTH, Rosebud, MT

Built 1977 Load: 29.9 t ADT: 65

IRR - S 39

Fair

Over: ROSEBUD CREEK

9M SE COLSTRIP, Rosebud, MT

Built 2004 Load: 29.9 t ADT: 713

S 332

Fair

Over: TONGUE RIVER

20M N ASHLAND, Rosebud, MT

Built 1963 Load: 29.9 t ADT: 64

S 566-TONGUE R RD

Fair

Over: CANYON CREEK

11M SW BIRNEY, Rosebud, MT

Built 1990 Load: 29.9 t ADT: 44

S 56 FH 5

Fair

Over: BULL RIVER

13M NW NOXON, Sanders, MT

Built 1971 Load: 29.9 t ADT: 679

I 90

Fair

Over: BRIDGER CREEK

6.8M E GREYCLIFF, Sweet Grass, MT

Built 1972 Load: 29.9 t ADT: 5,353

5TH LN NE

Fair

Over: MUDDY CREEK 016

5M NW COLLINS, Teton, MT

Built 1980 Load: 29.9 t ADT: 100

IRR - US 2

Fair

Over: LITTLE PORCUPINE CREEK

FRAZER, Valley, MT

Built 1960 Load: 29.9 t ADT: 1,326

SR 537

Fair

Over: MILK RIVER

2M N HINSDALE, Valley, MT

Built 1969 Load: 29.9 t ADT: 122

SELKIRK RD

Fair

Over: MARTINSDALE RES SPWY 021

8M W TWO DOT, Wheatland, MT

Built 1976 Load: 29.9 t ADT: 100

COUNTY ROAD 031

Fair

Over: SMITH CREEK 007

29M N WIBAUX, Wibaux, MT

Built 2012 Load: 29.9 t ADT: 100

1ST AVE

Fair

Over: BEAVER CREEK 009

WIBAUX-1ST AVE, Wibaux, MT

Built 1986 Load: 29.9 t ADT: 100

I 94

Fair

Over: HUNTLEY CANAL

2.5M W POMPEYS PILLAR, Yellowstone, MT

Built 1968 Load: 29.9 t ADT: 2,577

HIGHLINE CANAL RD

Fair

Over: HUNTLEY MAIN CANAL 152

1M NE BALLANTINE, Yellowstone, MT

Built 1982 Load: 29.9 t ADT: 65

KING AVE W

Fair

Over: BBWA CANAL

BILLINGS-KING AVE W, Yellowstone, MT

Built 1994 Load: 29.9 t ADT: 31,207

IRR BIA RTE 73

Fair

Over: ROTTEN GRASS CREEK

7.6 KM SE OF ST XAVIER, Big Horn, MT

Built 1980 Load: 30.0 t ADT: 200

IRR BIA RTE 73

Fair

Over: ROTTEN GRASS CREEK

10.6 KM SE OF ST XAVIER, Big Horn, MT

Built 1980 Load: 30.0 t ADT: 200

THREE CORNERS RD

Fair

Over: WOLF CREEK 061

21M SW PLENTYWOOD, Sheridan, MT

Built 1970 Load: 30.0 t ADT: 13

GRAVES CREEK ROAD

Fair

Over: TUCHUCK CREEK

8.8 MI WEST NORTH FORK RD, Flathead, MT

Built 1953 Load: 30.1 t ADT: 10

STEEP CR ROAD

Fair

Over: S F BIG CR

SF BIG CR, Lincoln, MT

Built 1979 Load: 30.1 t ADT: 50

RD 278

Fair

Over: BEAR CR

NEAR JCT W/U. BEAR CR., Lincoln, MT

Built 1976 Load: 30.1 t ADT: 50

GOLD CR RD

Fair

Over: GOLD CR

GOLD CR, Missoula, MT

Built 1983 Load: 30.1 t ADT: 50

IRR BIA RTE 73

Fair

Over: ROTTEN GRASS CREEK

15.3 KM SE OF ST. XAVIER, Big Horn, MT

Built 1986 Load: 30.4 t ADT: 200

BLANKENSHIP RD

Fair

Over: FLATHEAD RIVER 070

4M NW CORAM, Flathead, MT

Built 1960 Load: 30.4 t ADT: 538

FRONTAGE ROAD 137

Fair

Over: WARM SPRINGS CREEK 039

WARM SPRINGS, Deer Lodge, MT

Built 1974 Load: 30.5 t ADT: 100

CYCLONE BASIN RD

Fair

Over: MORAN CREEK

CYCLONE BASIN ROAD, Flathead, MT

Built 1966 Load: 30.5 t ADT: 5

NO DATA ENTERED

Fair

Over: ROSS FORK

ROSS FORK, Granite, MT

Built 1962 Load: 30.5 t ADT: 50

337 BOULDER/BASIN

Fair

Over: EAST FORK YAAK RIVER

JCT WITH YAAK 92, Lincoln, MT

Built 1981 Load: 30.5 t ADT: 60

RD 384

Fair

Over: HIATT CREEK

AT JCT WITH CAMPGROUND, Lincoln, MT

Built 1976 Load: 30.5 t ADT: 50

MONTANA CREEK ROAD

Fair

Over: SOUTH FORK FISH CR

MONTANA CREEK ROAD, Mineral, MT

Built 1973 Load: 30.5 t ADT: 50

Showing 2,201-2,250 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.