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

ALLENDALE RD

Fair

Over: BBWA CANAL 027

3M E LAUREL, Yellowstone, MT

Built 2001 Load: 26.3 t ADT: 100

OLD US 87

Fair

Over: E FORK PRYOR CREEK 174

9M SE BILLINGS, Yellowstone, MT

Built 1926 Load: 26.3 t ADT: 561

BERNHARDT RD

Fair

Over: DRAINAGE DITCH 191

LAUREL-BERNHARDT RD, Yellowstone, MT

Built 1980 Load: 26.3 t ADT: 121

S 522 (36-30)

Fair

Over: HUNTLEY CANAL

1M S HUNTLEY, Yellowstone, MT

Built 1967 Load: 26.3 t ADT: 4,306

I 90

Fair

Over: CLARK FORK RIVER

6.2M E SUPERIOR, Mineral, MT

Built 1967 Load: 26.4 t ADT: 3,776

SWAMP CR ROAD

Fair

Over: BIG SWAMP CR

BIG SWAMP CR, Beaverhead, MT

Built 1968 Load: 26.6 t ADT: 15

FOREST ROAD

Fair

Over: MOOSE CREEK

210C PHYSICAL BARRIER, Flathead, MT

Built 1955 Load: 26.6 t ADT: 30

FOREST ROAD

Fair

Over: RED BUTTE CREEK

RED BUTTE CREEK, Missoula, MT

Built 2004 Load: 26.6 t ADT: 40

LODGE CREEK RD

Fair

Over: DRAINAGE

1M NE CHINOOK, Blaine, MT

Built 1952 Load: 26.8 t ADT: 100

LACASSE LN

Fair

Over: FRENCHTOWN IRR CANAL 094

4M S FRENCHTOWN, Missoula, MT

Built 1960 Load: 26.8 t ADT: 186

FOX EAST BENCH RD

Fair

Over: ROCK CREEK 025

FOX, Carbon, MT

Built 2006 Load: 26.9 t ADT: 100

GIBSON RD

Fair

Over: ROCK CREEK 029

1M E ROCKVALE, Carbon, MT

Built 1979 Load: 26.9 t ADT: 31

19TH STREET

Fair

Over: ROCK CREEK 059

RED LODGE-19TH ST, Carbon, MT

Built 2012 Load: 26.9 t ADT: 359

WHITE BRIDGE RD

Fair

Over: BOULDER RIVER 044

6M SE BOULDER, Jefferson, MT

Built 1979 Load: 26.9 t ADT: 100

NFSR #487

Fair

Over: M FK JUDITH RIVER

13 MI SW OF UTICA, Judith Basin, MT

Built 1961 Load: 26.9 t ADT: 65

RD 4727

Fair

Over: CEDAR CREEK

CEDAR CREEK TRAIL HEAD, Lincoln, MT

Built 1980 Load: 26.9 t ADT: 50

I 15

Fair

Over: BEAVERHEAD RIVER

3.1M S DILLON, Beaverhead, MT

Built 1982 Load: 27.2 t ADT: 2,826

HIGH BRIDGE RD

Fair

Over: BEAVERHEAD RIVER 125

5M N CLARK CANYON DAM, Beaverhead, MT

Built 1980 Load: 27.2 t ADT: 100

WHITE LN

Fair

Over: EAST BENCH CANAL 102

2M SE DILLON, Beaverhead, MT

Built 1962 Load: 27.2 t ADT: 100

S 43

Fair

Over: SMART CREEK

WISE RIVER, Beaverhead, MT

Built 1970 Load: 27.2 t ADT: 576

S 324

Fair

Over: MEDICINE LODGE CREEK

5M E GRANT, Beaverhead, MT

Built 1963 Load: 27.2 t ADT: 185

US 2

Fair

Over: DRAINAGE

4M W ZURICH, Blaine, MT

Built 1941 Load: 27.2 t ADT: 2,067

TURNER RD

Fair

Over: E FORK WAYNE CREEK

9M NE HARLEM, Blaine, MT

Built 1947 Load: 27.2 t ADT: 61

CROW CREEK RD

Fair

Over: CROW CREEK 014

3M N RADERSBURG, Broadwater, MT

Built 1967 Load: 27.2 t ADT: 100

VOLNEY CREEK RD

Fair

Over: RED LODGE CREEK 042

6M SE ROSCOE, Carbon, MT

Built 1930 Load: 27.2 t ADT: 100

10TH LN

Fair

Over: BENCH SOUTH CANAL 048

10M E FAIRFIELD, Cascade, MT

Built 1984 Load: 27.2 t ADT: 100

EWING RD

Fair

Over: BELT CREEK 074

3M N BELT, Cascade, MT

Built 1973 Load: 27.2 t ADT: 100

I 94

Fair

Over: DIXON CREEK

14M NE MILES CITY, Custer, MT

Built 1984 Load: 27.2 t ADT: 2,111

I 94

Fair

Over: DIXON CREEK

14M NE MILES CITY, Custer, MT

Built 1984 Load: 27.2 t ADT: 2,111

I 94

Fair

Over: SEP ACCESS RD-DRAINAGE

19M NE MILES CITY, Custer, MT

Built 1971 Load: 27.2 t ADT: 2,111

I 94

Fair

Over: SEP ACCESS RD-DRAINAGE

19M NE MILES CITY, Custer, MT

Built 1971 Load: 27.2 t ADT: 2,111

CROW ROCK RD

Fair

Over: GRIMES CREEK 010

19M NW MILES CITY, Custer, MT

Built 1986 Load: 27.2 t ADT: 100

POWDERVILLE RD

Fair

Over: SAND CREEK 003

42M SE MILES CITY, Custer, MT

Built 1980 Load: 27.2 t ADT: 47

US 94

Fair

Over: RR

2M SW MILES CITY, Custer, MT

Built 1954 Load: 27.2 t ADT: 1,372

US 12

Fair

Over: POWDER RIVER

26M E MILES CITY, Custer, MT

Built 1973 Load: 27.2 t ADT: 549

S 248

Fair

Over: DRAINAGE

FOUR BUTTES, Daniels, MT

Built 1941 Load: 27.2 t ADT: 390

S 16

Fair

Over: MORGAN CREEK

4M SW INTAKE, Dawson, MT

Built 1967 Load: 27.2 t ADT: 2,216

I 90

Fair

Over: WARM SPRINGS-WB INT RAMP

WARM SPRINGS, Deer Lodge, MT

Built 1978 Load: 27.2 t ADT: 98

FRONTAGE ROAD 011

Fair

Over: LOST CREEK 037

3M N WARM SPRINGS, Deer Lodge, MT

Built 1931 Load: 27.2 t ADT: 899

S 1

Fair

Over: RR

6M S WARM SPRINGS, Deer Lodge, MT

Built 1964 Load: 27.2 t ADT: 4,553

S 1

Fair

Over: RR

6M S WARM SPRINGS, Deer Lodge, MT

Built 1964 Load: 27.2 t ADT: 2,277

US 12

Fair

Over: HAY CREEK

9M W PLEVNA, Fallon, MT

Built 1932 Load: 27.2 t ADT: 513

PLEVNA RD S

Fair

Over: SOUTH FORK SANDSTONE CR

1M S PLEVNA, Fallon, MT

Built 1964 Load: 27.2 t ADT: 76

DONALDSON RD

Fair

Over: DRY WOLF CREEK 090

7M E DENTON, Fergus, MT

Built 1982 Load: 27.2 t ADT: 100

UPPER ELK CR RD

Fair

Over: ELK CREEK 126

6M S GRASSRANGE, Fergus, MT

Built 1982 Load: 27.2 t ADT: 100

US 87

Fair

Over: DRAINAGE

6M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 27.2 t ADT: 1,300

US 87

Fair

Over: DRAINAGE

3M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 27.2 t ADT: 1,300

S 81

Fair

Over: DRY WOLF CREEK

6M SE DENTON, Fergus, MT

Built 1949 Load: 27.2 t ADT: 263

FOREST ROAD

Fair

Over: HAY CREEK

1ST BRIDGE W OF NF ROAD, Flathead, MT

Built 1961 Load: 27.2 t ADT: 5

GOING-TO-THE-SUN R

Fair

Over: SNYDER CREEK

10.8 miles northeast of U, Flathead, MT

Built 1935 Load: 27.2 t ADT: 1,230

Showing 1,851-1,900 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.