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

443 RAMP-I 90

Fair

Over: SHILOH INTERCHANGE

BILLINGS, Yellowstone, MT

Built 2001 Load: 24.5 t ADT: 5,463

HESPER RD

Fair

Over: CANYON CREEK 114

7M NE LAUREL, Yellowstone, MT

Built 1972 Load: 24.5 t ADT: 519

21 MILE RD

Fair

Over: N FK CROOKED CREEK 079

20M N BILLINGS, Yellowstone, MT

Built 1965 Load: 24.5 t ADT: 68

CUSTER FRTG RD

Fair

Over: ROUGH COULEE 033

6M NE POMPEY`S PILLAR, Yellowstone, MT

Built 1940 Load: 24.5 t ADT: 146

CUSTER FRTG RD

Fair

Over: SPRING CREEK 035

8M NE POMPEY`S PILLAR, Yellowstone, MT

Built 1940 Load: 24.5 t ADT: 146

RAZOR CREEK RD

Fair

Over: RAZOR CREEK 164

3M N SHEPHERD, Yellowstone, MT

Built 1977 Load: 24.5 t ADT: 100

BUFFALO CREEK RD

Fair

Over: BUFFALO CREEK 132

5M NW CUSTER, Yellowstone, MT

Built 2012 Load: 24.5 t ADT: 100

KING AVE W

Fair

Over: CANYON CREEK

5M W BILLINGS, Yellowstone, MT

Built 1966 Load: 24.5 t ADT: 780

WEASEL CK ROAD

Fair

Over: CROW CREEK

JENKINS GULCH, Broadwater, MT

Built 1983 Load: 24.6 t ADT: 20

NO DATA ENTERED

Fair

Over: COPPER CR

AFTER COPPER CREEK CG, Granite, MT

Built 1956 Load: 24.6 t ADT: 50

FDR 119

Fair

Over: SHEEP CREEK

3.8 MI WEST US89/119 JCT, Meagher, MT

Built 1956 Load: 24.6 t ADT: 50

NFSR

Fair

Over: CONDON CREEK

CONCON, Missoula, MT

Built 2010 Load: 24.6 t ADT: 50

SAWPIT

Fair

Over: NINEMILE CR

SAWPIT, Missoula, MT

Built 1970 Load: 24.6 t ADT: 50

STAHL CREEK ROAD

Fair

Over: STAHL CR

STAHL CR, Lincoln, MT

Built 1966 Load: 24.9 t ADT: 50

S.FK.STAHL CR RD

Fair

Over: STAHL CR

STAHL CR, Lincoln, MT

Built 1966 Load: 24.9 t ADT: 50

5900 JUNGLE CR.RD.

Fair

Over: WEST FORK YAAK RIVER

JUST PAST JCT WITH 338, Lincoln, MT

Built 1980 Load: 24.9 t ADT: 10

RD 450

Fair

Over: WINDFALL CR

VERDE WINDFALL, Mineral, MT

Built 1967 Load: 24.9 t ADT: 50

NO DATA ENTERED

Fair

Over: BLIND CANYON

NO DATA ENTERED, Missoula, MT

Built 1991 Load: 24.9 t ADT: 50

MILLEGAN RD

Fair

Over: MISSOURI RIVER

ULM, Cascade, MT

Built 1983 Load: 25.0 t ADT: 549

Lower Ray Cr Road

Fair

Over: Eastside Canal

5 mi NE of Townsend MT, Broadwater, MT

Built 1974 Load: 25.2 t ADT: 5

NO DATA ENTERED

Fair

Over: BIG LAKE

BIG LAKE CR, Beaverhead, MT

Built 1971 Load: 25.3 t ADT: 40

SARPY BASIN RD

Fair

Over: SARPY CREEK 033

24M E HARDIN, Big Horn, MT

Built 1981 Load: 25.3 t ADT: 100

NO DATA ENTERED

Fair

Over: MILLER CR

NO DATA ENTERED, Sanders, MT

Built 1956 Load: 25.3 t ADT: 20

NO DATA ENTERED

Fair

Over: N FK E FK BULL RIVER

NO DATA ENTERED, Sanders, MT

Built 1960 Load: 25.3 t ADT: 50

VALLEY CREEK RD

Fair

Over: VALLEY CREEK 008

2M NW PARK CITY, Stillwater, MT

Built 2010 Load: 25.3 t ADT: 100

I 15

Fair

Over: BEAVERHEAD RIVER

8M N CLARK CANYON DAM, Beaverhead, MT

Built 1981 Load: 25.4 t ADT: 2,210

STODDARD DR

Fair

Over: EAST BENCH CANAL 002

8M NE DILLON, Beaverhead, MT

Built 1962 Load: 25.4 t ADT: 100

MT HWY 91

Fair

Over: POINDEXTER SLOUGH

3M SW DILLON, Beaverhead, MT

Built 1936 Load: 25.4 t ADT: 582

I 90

Fair

Over: RR

14.9M W HARDIN, Big Horn, MT

Built 1972 Load: 25.4 t ADT: 3,688

I 90

Fair

Over: RR

14.9M W HARDIN, Big Horn, MT

Built 1972 Load: 25.4 t ADT: 3,688

IRR - I 90

Fair

Over: LITTLE BIGHORN RIVER

2.5M S CROW AGENCY, Big Horn, MT

Built 1976 Load: 25.4 t ADT: 2,439

IRR - I 90

Fair

Over: SEP LOCAL ROAD

3.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 25.4 t ADT: 1,978

IRR - I 90

Fair

Over: SEP LOCAL ROAD

3.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 25.4 t ADT: 1,978

WARMAN LOOP

Fair

Over: BIGHORN CANAL 018

3M NE FORT SMITH, Big Horn, MT

Built 1930 Load: 25.4 t ADT: 100

NEW HOPE RD

Fair

Over: SNAKE CREEK 042

9M W HARLEM, Blaine, MT

Built 1933 Load: 25.4 t ADT: 100

US 2

Fair

Over: DRAINAGE

CHINOOK, Blaine, MT

Built 1942 Load: 25.4 t ADT: 2,818

TURNER RD

Fair

Over: S FORK WAYNE CREEK

7M NE HARLEM, Blaine, MT

Built 1947 Load: 25.4 t ADT: 61

TURNER RD

Fair

Over: W SAVOY CREEK

13M NE HARLEM, Blaine, MT

Built 1947 Load: 25.4 t ADT: 61

S 72

Fair

Over: CLARKS FORK YELLOWSTONE

4M NE BELFRY, Carbon, MT

Built 2011 Load: 25.4 t ADT: 1,722

LITTLE MISSOURI RD

Fair

Over: LITTLE MISSOURI RIV 009

15M SW CAPITOL, Carter, MT

Built 1989 Load: 25.4 t ADT: 42

US 89

Fair

Over: MILL COULEE CANAL

5M N FORT SHAW, Cascade, MT

Built 1940 Load: 25.4 t ADT: 1,747

S 80

Fair

Over: FLAT CREEK

3M SE GERALDINE, Chouteau, MT

Built 1949 Load: 25.4 t ADT: 234

S 80

Fair

Over: BUTTE CREEK

6M SE SQUARE BUTTE, Chouteau, MT

Built 1950 Load: 25.4 t ADT: 157

PLEASANT VIEW RD

Fair

Over: CLEAR CREEK 026

17M W GLENDIVE, Dawson, MT

Built 1976 Load: 25.4 t ADT: 50

S 200S-TOWNE ST

Fair

Over: YELLOWSTONE RIVER

GLENDIVE-TOWNE ST, Dawson, MT

Built 1958 Load: 25.4 t ADT: 8,640

US 94

Fair

Over: UPPER SEVEN MILE CREEK

1M SW GLENDIVE, Dawson, MT

Built 1959 Load: 25.4 t ADT: 2,450

US 94

Fair

Over: UPPER SEVEN MILE CREEK

1M SW GLENDIVE, Dawson, MT

Built 1959 Load: 25.4 t ADT: 1,225

MARSH RD

Fair

Over: DRAINAGE

1M S GLENDIVE, Dawson, MT

Built 1964 Load: 25.4 t ADT: 434

FRONTAGE ROAD 146

Fair

Over: WILLOW CREEK 033

4M S WARM SPRINGS, Deer Lodge, MT

Built 1931 Load: 25.4 t ADT: 100

S 1

Fair

Over: WARM SPRINGS CREEK

1M W ANACONDA, Deer Lodge, MT

Built 1990 Load: 25.4 t ADT: 4,724

Showing 1,651-1,700 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.