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 7

Fair

Over: DRAINAGE-STOCKPASS

18M S WIBAUX, Wibaux, MT

Built 1942 Load: 25.4 t ADT: 624

S 7

Fair

Over: BEAVER CREEK

SOUTH EDGE OF WIBAUX, Wibaux, MT

Built 1949 Load: 25.4 t ADT: 1,661

S SHILOH RD

Fair

Over: CANYON CREEK

2M SW BILLINGS, Yellowstone, MT

Built 1959 Load: 25.4 t ADT: 3,878

IRR - S 313

Fair

Over: ROTTEN GRASS CREEK

SAINT XAVIER, Big Horn, MT

Built 1983 Load: 25.5 t ADT: 617

NO DATA ENTERED

Fair

Over: JERRY CREEK

JERRY CR, Deer Lodge, MT

Built 1965 Load: 25.6 t ADT: 50

FOREST ROAD

Fair

Over: HALLOWAT CREEK

8 MI WEST NORTH FORK RD, Flathead, MT

Built 1956 Load: 25.6 t ADT: 10

STEEP CREEK ROAD

Fair

Over: BIG CREEK

BIG CR, Lincoln, MT

Built 1963 Load: 25.6 t ADT: 40

PRIMROSE LN

Fair

Over: JEFFERSON RIVER

SILVER STAR, Madison, MT

Built 2003 Load: 25.6 t ADT: 108

DIVIDE CREEK ROAD

Fair

Over: TOM MINER CREEK

TOM MINER BASIN, Park, MT

Built 1976 Load: 25.6 t ADT: 50

NO DATA ENTERED

Fair

Over: MIDDLE FK BULL RIVER

NO DATA ENTERED, Sanders, MT

Built 1995 Load: 25.6 t ADT: 50

1-LANE ROAD

Fair

Over: LAKE FORK ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 1952 Load: 25.9 t ADT: 50

MOON CREEK RD

Fair

Over: COTTONWOOD CREEK 044

13M SW MILES CITY, Custer, MT

Built 1928 Load: 25.9 t ADT: 82

S 332

Fair

Over: FOSTER CREEK

31M SW MILES CITY, Custer, MT

Built 1952 Load: 25.9 t ADT: 86

FOREST ROAD

Fair

Over: GRAVES CREEK

GRAVES CREEK, Flathead, MT

Built 2002 Load: 25.9 t ADT: 75

NO DATA ENTERED

Fair

Over: MIDDLE FORK ROCK CR

AT JUNCTION TO MOOSE LAKE, Granite, MT

Built 1956 Load: 25.9 t ADT: 50

NFDR 3350

Fair

Over: DRY FORK BELT CREEK

0.1 MI SOUTH 120/3350 JCT, Judith Basin, MT

Built 1967 Load: 25.9 t ADT: 40

BANNER CREEK RD

Fair

Over: RUBY CREEK

TEN MILE, Lewis and Clark, MT

Built 1964 Load: 25.9 t ADT: 60

RD 7609

Fair

Over: FISHTRAP CREEK

FISHTRAP CREEK, Sanders, MT

Built 1957 Load: 25.9 t ADT: 50

BLUE SLIDE RD

Fair

Over: VERMILLION RIVER

3M E TROUT CREEK, Sanders, MT

Built 1972 Load: 25.9 t ADT: 222

1-LANE ROAD

Fair

Over: W.FORK STILLWATER RIVER

NO DATA ENTERED, Sweet Grass, MT

Built 1964 Load: 25.9 t ADT: 50

CREVICE MNT RD

Fair

Over: BEAR CREEK 080

JARDINE, Park, MT

Built 2009 Load: 26.0 t ADT: 100

ROAD 944

Fair

Over: MOOSE CREEK

NO DATA ENTERED, Beaverhead, MT

Built 1974 Load: 26.2 t ADT: 15

S 48

Fair

Over: WARM SPRINGS CREEK

WARM SPRINGS, Deer Lodge, MT

Built 1931 Load: 26.2 t ADT: 1,660

BIG HORN DR

Fair

Over: ASHLEY CREEK 006

8M W KALISPELL, Flathead, MT

Built 2002 Load: 26.2 t ADT: 100

RD 763

Fair

Over: FISHER RIVER

FISHER RIVER, Lincoln, MT

Built 1977 Load: 26.2 t ADT: 40

HARVEY RD

Fair

Over: MUSSELSHELL RIVER 024

3M SW MELSTONE, Musselshell, MT

Built 2013 Load: 26.2 t ADT: 100

COUNTY ROAD 548

Fair

Over: MUSSELSHELL RIVER 025

ROUNDUP, Musselshell, MT

Built 2013 Load: 26.2 t ADT: 100

NO DATA ENTERED

Fair

Over: BLODGETT CR

NO DATA ENTERED, Ravalli, MT

Built 1967 Load: 26.2 t ADT: 20

COUNTY ROAD 451

Fair

Over: USBR MAIN CANAL 091

7M SW SAVAGE, Richland, MT

Built 2001 Load: 26.2 t ADT: 17

NO DATA ENTERED

Fair

Over: GREEN GULCH

NO DATA ENTERED, Sanders, MT

Built 1962 Load: 26.2 t ADT: 50

RD 217

Fair

Over: W FK SWAMP CR

W FK SWAMP CR, Sanders, MT

Built 1965 Load: 26.2 t ADT: 50

BIG LAKE CR RD

Fair

Over: BIG HOLE RIVER 091

8M N JACKSON, Beaverhead, MT

Built 1976 Load: 26.3 t ADT: 100

BURMA RD

Fair

Over: BIG HOLE RIVER 073

1M SE GLEN, Beaverhead, MT

Built 2000 Load: 26.3 t ADT: 100

IRR - I 90

Fair

Over: LITTLE BIGHORN RIVER

0.6M S CROW AGENCY, Big Horn, MT

Built 1959 Load: 26.3 t ADT: 3,503

IRR - I 90

Fair

Over: SEP COUNTY ROAD

6.8M N LODGE GRASS, Big Horn, MT

Built 1980 Load: 26.3 t ADT: 2,055

IRR - I 90

Fair

Over: SEP COUNTY ROAD

6.8M N LODGE GRASS, Big Horn, MT

Built 1980 Load: 26.3 t ADT: 2,055

IRR - S 73

Fair

Over: LITTLE BIGHORN RIVER

LODGE GRASS, Big Horn, MT

Built 1980 Load: 26.3 t ADT: 641

CLEAR CR RD SE

Fair

Over: CLEAR CREEK 095

17M S LOHMAN, Blaine, MT

Built 1985 Load: 26.3 t ADT: 37

S MAIN ST

Fair

Over: ROCK CREEK 046

JOLIET, Carbon, MT

Built 1987 Load: 26.3 t ADT: 891

RIVERVIEW LN

Fair

Over: CLARKS FK YELLOWSTNE 007

2M S BELFRY, Carbon, MT

Built 1981 Load: 26.3 t ADT: 100

MILL COULEE RD

Fair

Over: MILL COULEE CANAL 064

8M SE FAIRFIELD, Cascade, MT

Built 1920 Load: 26.3 t ADT: 100

COUNTY ROAD 242

Fair

Over: OTTER CREEK 125

BLYTHE, Cascade, MT

Built 1950 Load: 26.3 t ADT: 9

US 89

Fair

Over: MILL COULEE CREEK

1M NE SUN RIVER, Cascade, MT

Built 1940 Load: 26.3 t ADT: 1,428

6TH ST SW

Fair

Over: SUN RIVER

GREAT FALLS-6TH ST SW, Cascade, MT

Built 1980 Load: 26.3 t ADT: 14,706

FRNTAGE ROAD 81020

Fair

Over: MILES CREEK 037

20M NE MILES CITY, Custer, MT

Built 1929 Load: 26.3 t ADT: 504

S 59

Fair

Over: YELLOWSTONE RIVER

MILES CITY, Custer, MT

Built 1957 Load: 26.3 t ADT: 3,086

S 59

Fair

Over: NORTH FORK SUNDAY CREEK

10M NW MILES CITY, Custer, MT

Built 1963 Load: 26.3 t ADT: 496

S 16

Fair

Over: LOWER 7 MILE CREEK

6M SW INTAKE, Dawson, MT

Built 1967 Load: 26.3 t ADT: 2,216

I 90

Fair

Over: CLARK FORK RIVER

2.5M N OPPORTUNITY, Deer Lodge, MT

Built 1978 Load: 26.3 t ADT: 5,053

FRONTAGE ROAD 146

Fair

Over: CLARK FORK RIVER 034

4M S WARM SPRINGS, Deer Lodge, MT

Built 1931 Load: 26.3 t ADT: 100

Showing 1,751-1,800 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.