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 41

Fair

Over: FISH CREEK

6M N SILVERSTAR, Silver Bow, MT

Built 1934 Load: 27.2 t ADT: 399

RAPELJE RD

Fair

Over: KEYSER CREEK

6M NW COLUMBUS, Stillwater, MT

Built 1976 Load: 27.2 t ADT: 576

I 90

Fair

Over: BOULDER RIVER

BIG TIMBER, Sweet Grass, MT

Built 1980 Load: 27.2 t ADT: 4,913

I 90

Fair

Over: BOULDER RIVER

BIG TIMBER, Sweet Grass, MT

Built 1980 Load: 27.2 t ADT: 4,913

BLACKLEAF RD

Fair

Over: MUDDY CREEK 032

4M NW BYNUM, Teton, MT

Built 1982 Load: 27.2 t ADT: 52

3RD LN NW

Fair

Over: MUDDY CREEK 018

10M NE FARMINGTON, Teton, MT

Built 1938 Load: 27.2 t ADT: 100

BJORNBERG BRDG RD

Fair

Over: MILK RIVER 036

11M NW HINSDALE, Valley, MT

Built 1995 Load: 27.2 t ADT: 100

OSWEGO NORTH RD

Fair

Over: WEST FORK WOLF CREEK 057

17M N OSWEGO, Valley, MT

Built 1950 Load: 27.2 t ADT: 100

BRAZIL CREEK RD

Fair

Over: VANDALIA SOUTH CANAL 113

2M SW GLASGOW, Valley, MT

Built 1988 Load: 27.2 t ADT: 100

US 2

Fair

Over: MILK RIVER

2M E HINSDALE, Valley, MT

Built 1966 Load: 27.2 t ADT: 1,148

S 248

Fair

Over: W FK POPLAR RV OVERFLOW

NE OF RICHLAND, Valley, MT

Built 1948 Load: 27.2 t ADT: 193

S SHAWMUT RD

Fair

Over: MUSSELSHELL RIVER 009

S SHAWMUT, Wheatland, MT

Built 1949 Load: 27.2 t ADT: 100

S 297

Fair

Over: DEADMAN`S BASIN CANAL

1M N SHAWMUT, Wheatland, MT

Built 1959 Load: 27.2 t ADT: 79

S 56TH ST W

Fair

Over: CANYON CREEK DITCH 075

W BILLINGS-S 56TH ST W, Yellowstone, MT

Built 1925 Load: 27.2 t ADT: 2,281

SPANISH CREEK ROAD

Fair

Over: NORTH FORK SPANISH CREEK

SPANISH CREEK, Madison, MT

Built 1967 Load: 27.5 t ADT: 50

FDR 211

Fair

Over: FOUR MILE CREEK

4.5 MI SE US12/FDR211 JCT, Meagher, MT

Built 1973 Load: 27.5 t ADT: 50

NO DATA ENTERED

Fair

Over: WHITE PINE CR

NO DATA ENTERED, Sanders, MT

Built 1960 Load: 27.5 t ADT: 30

SNAKE TRAIL

Fair

Over: DRAINAGE 054

19M NE BAKER, Fallon, MT

Built 2003 Load: 27.9 t ADT: 100

RD 472

Fair

Over: YAAK RIVER

YAAK RIVER, Lincoln, MT

Built 1954 Load: 27.9 t ADT: 50

RD 352

Fair

Over: TWELVEMILE CREEK

HENDERSON-THOMPSON, Mineral, MT

Built 1955 Load: 27.9 t ADT: 50

RD 7670

Fair

Over: BEATRICE CREEK

BEATRICE CR, Sanders, MT

Built 1959 Load: 27.9 t ADT: 50

I 15

Fair

Over: SEP LOCAL ROAD

2.5M S DILLON, Beaverhead, MT

Built 1983 Load: 28.1 t ADT: 2,826

I 15

Fair

Over: SEP LOCAL ROAD

2.5M S DILLON, Beaverhead, MT

Built 1983 Load: 28.1 t ADT: 2,826

ROCK CREEK RD

Fair

Over: BIG HOLE RIVER 078

3M SW WISDOM, Beaverhead, MT

Built 1989 Load: 28.1 t ADT: 100

TRAPPER CR RD

Fair

Over: BIG HOLE OVERFLOW 055

MELROSE, Beaverhead, MT

Built 1973 Load: 28.1 t ADT: 187

S 43

Fair

Over: BIG HOLE RIVER

7M NW WISE RIVER, Beaverhead, MT

Built 1960 Load: 28.1 t ADT: 419

S 278

Fair

Over: GRASSHOPPER CREEK

21M W DILLON, Beaverhead, MT

Built 1957 Load: 28.1 t ADT: 656

S 324

Fair

Over: MEDICINE LODGE CREEK

7M E GRANT, Beaverhead, MT

Built 1963 Load: 28.1 t ADT: 282

REDROCK RD

Fair

Over: RED ROCK COULEE 009

4M NW CHINOOK, Blaine, MT

Built 1933 Load: 28.1 t ADT: 211

US 12

Fair

Over: DEEP CREEK

16M E TOWNSEND, Broadwater, MT

Built 2014 Load: 28.1 t ADT: 707

US 310

Fair

Over: CLARKS FK YELLOWSTONE

2M S BRIDGER, Carbon, MT

Built 1971 Load: 28.1 t ADT: 2,245

STAGVILLE DRAW RD

Fair

Over: RUSSELL CREEK 005

3M SE EKALAKA, Carter, MT

Built 1938 Load: 28.1 t ADT: 100

LITTLE MISSOURI RD

Fair

Over: HORSE CREEK 008

16M NE ALZADA, Carter, MT

Built 2012 Load: 28.1 t ADT: 42

US 212

Fair

Over: WILLOW CREEK

8M NW ALZADA, Carter, MT

Built 1955 Load: 28.1 t ADT: 2,170

S 323

Fair

Over: LITTLE MISSOURI RIVER

15M NE ALZADA, Carter, MT

Built 1983 Load: 28.1 t ADT: 215

COUNTY LINE RD

Fair

Over: GREENFIELD S CANAL 043

9M E FAIRFIELD, Cascade, MT

Built 1982 Load: 28.1 t ADT: 100

BELT PARK RD

Fair

Over: BELT CREEK 019

3M S MONARCH, Cascade, MT

Built 1955 Load: 28.1 t ADT: 100

US 89

Fair

Over: MILL COULEE CREEK

2M NE SUN RIVER, Cascade, MT

Built 1940 Load: 28.1 t ADT: 1,428

LOWER RIVER RD

Fair

Over: SAND COULEE CREEK

3M S GREAT FALLS, Cascade, MT

Built 1937 Load: 28.1 t ADT: 1,587

S 80

Fair

Over: CHIMNEY ROCK

2M SE GERALDINE, Chouteau, MT

Built 1949 Load: 28.1 t ADT: 234

MOON CREEK RD

Fair

Over: TONGUE RIVER 041

43M SW MILES CITY, Custer, MT

Built 1988 Load: 28.1 t ADT: 36

FRONTAGE ROAD 205

Fair

Over: COTTONWOOD CREEK 072

14M SW MILES CITY, Custer, MT

Built 1929 Load: 28.1 t ADT: 100

E SUSAG RD

Fair

Over: POPLAR RIVER 039

18M S SCOBEY, Daniels, MT

Built 2001 Load: 28.1 t ADT: 100

S 13

Fair

Over: OUTLET CREEK

11M N SCOBEY, Daniels, MT

Built 1957 Load: 28.1 t ADT: 42

COUNTY ROAD 054

Fair

Over: SANDSTONE CREEK 034

5M E PLEVNA, Fallon, MT

Built 2005 Load: 28.1 t ADT: 7

COUNTY ROAD 220

Fair

Over: FORDS CREEK 006

14M NW GRASSRANGE, Fergus, MT

Built 1981 Load: 28.1 t ADT: 100

US 191

Fair

Over: ARMELLS CREEK

27M NE ROY, Fergus, MT

Built 1963 Load: 28.1 t ADT: 622

IRR - US 2

Fair

Over: DEVIL CREEK

6M SW SUMMIT, Flathead, MT

Built 1963 Load: 28.1 t ADT: 1,929

S 35

Fair

Over: FLATHEAD RIVER

2M E KALISPELL, Flathead, MT

Built 1994 Load: 28.1 t ADT: 14,368

S 200

Fair

Over: BIG DRY CREEK

12M SW JORDAN, Garfield, MT

Built 1992 Load: 28.1 t ADT: 479

Showing 1,951-2,000 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.