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

SHAMROCK ROAD

Fair

Over: BOULDER RIVER

2 MI PAST WHITEHOUSE C. G, Jefferson, MT

Built 1980 Load: 28.2 t ADT: 40

I 15

Fair

Over: LITTLE PRICKLY PEAR CR

9M S WOLF CREEK, Lewis and Clark, MT

Built 1965 Load: 28.2 t ADT: 2,383

FS ROUTE NO. 871

Fair

Over: AMERICAN CREEK

AMERICAN CREEK, Lincoln, MT

Built 1955 Load: 28.2 t ADT: 50

RD 6748

Fair

Over: LAKE CR

SILVER DOLLAR, Lincoln, MT

Built 1962 Load: 28.2 t ADT: 50

RD 352

Fair

Over: TWELVEMILE CREEK

HENDERSON-THOMPSON, Mineral, MT

Built 1955 Load: 28.2 t ADT: 50

RD 450

Fair

Over: TROUT CR

VERDE WINDFALL, Mineral, MT

Built 1967 Load: 28.2 t ADT: 50

RD 1181

Fair

Over: E FK BIG CREEK

MIDDLE FK BIG CR, Mineral, MT

Built 1954 Load: 28.2 t ADT: 50

ELK MEADOWS RD

Fair

Over: LOLO CR

ELK MEADOWS, Missoula, MT

Built 1960 Load: 28.2 t ADT: 50

W.SIDE 9-MILE RD

Fair

Over: NINEMILE CR.

W. SIDE NINEMILE, Missoula, MT

Built 1968 Load: 28.2 t ADT: 50

TELEGRAPH CR RD

Fair

Over: TELEGRAPH CREEK 061

4M S ELLISTON, Powell, MT

Built 1950 Load: 28.2 t ADT: 100

ROAD 436

Fair

Over: CAMP CR

NO DATA ENTERED, Ravalli, MT

Built 1979 Load: 28.2 t ADT: 20

FORTY MILE RD

Fair

Over: OWL CREEK 085

2M SE LODGE GRASS, Big Horn, MT

Built 2015 Load: 28.5 t ADT: 100

ARMINGTON RD

Fair

Over: BIG OTTER CREEK 029

3M SE BELT, Cascade, MT

Built 1954 Load: 28.5 t ADT: 100

FOREST ROAD

Fair

Over: GRIFFIN CREEK

GREAT GRIFFIN ROAD, Flathead, MT

Built 1980 Load: 28.5 t ADT: 20

HEBGEN LAKE ROAD

Fair

Over: WATKINS CREEK

NO DATA ENTERED, Gallatin, MT

Built 2011 Load: 28.5 t ADT: 40

S.ROCK CREEK ROAD

Fair

Over: ROCK CREEK

S. OF LIVINGSTON, Gallatin, MT

Built 1987 Load: 28.5 t ADT: 50

IRR BIA RTE 4

Fair

Over: WHITETAIL CREEK

11.3 KM NE OF HEART BUTTE, Glacier, MT

Built 1972 Load: 28.5 t ADT: 500

RD 231

Fair

Over: RAMSEY CR

LIBBY CR., Lincoln, MT

Built 1965 Load: 28.5 t ADT: 50

RATTLESNAKE CR RD

Fair

Over: RATTLESNAKE CREEK

RATTLESNAKE CR, Missoula, MT

Built 1981 Load: 28.5 t ADT: 50

MATTIE V

Fair

Over: NINEMILE CR

MATTIE V, Missoula, MT

Built 1979 Load: 28.5 t ADT: 50

2864: BRAZIEL CR.

Fair

Over: NEVADA CREEK

0.2 mi S of MT141, Powell, MT

Built 1977 Load: 28.5 t ADT: 25

NFSR

Fair

Over: MARION CREEK

MIDDLE FORK FLATHEAD, Flathead, MT

Built 2008 Load: 28.8 t ADT: 40

NFSR 233

Fair

Over: BEAVER CREEK

BEAVER CREEK NO. 5, Lewis and Clark, MT

Built 1978 Load: 28.8 t ADT: 26

I 15

Fair

Over: STICKNEY CREEK

2M N CRAIG, Lewis and Clark, MT

Built 1968 Load: 28.8 t ADT: 2,224

COUNTY ROAD 350

Fair

Over: USBR MAIN CANAL 025

2M N SIDNEY, Richland, MT

Built 2003 Load: 28.8 t ADT: 339

MARTEN CREEK RD

Fair

Over: MARTEN CREEK 026

7M S NOXON, Sanders, MT

Built 1968 Load: 28.8 t ADT: 170

WHITEBIRD CR RD

Fair

Over: WHITEBIRD CREEK 049

7M NE ABSAROKEE, Stillwater, MT

Built 1998 Load: 28.9 t ADT: 267

I 15

Fair

Over: POINDEXTER SLOUGH

2.5M S DILLON, Beaverhead, MT

Built 1983 Load: 29.0 t ADT: 2,826

I 15

Fair

Over: POINDEXTER SLOUGH

2.5M S DILLON, Beaverhead, MT

Built 1983 Load: 29.0 t ADT: 2,826

OLD STAGE RD

Fair

Over: BEAVERHEAD RIVER 047

E BARRETTS INT, Beaverhead, MT

Built 1995 Load: 29.0 t ADT: 292

S 324

Fair

Over: HORSE PRAIRIE CREEK

8M E GRANT, Beaverhead, MT

Built 1963 Load: 29.0 t ADT: 282

IRR - FRONTAGE 315

Fair

Over: LITTLE BIGHORN RIVER 002

2M S CROW AGENCY, Big Horn, MT

Built 1976 Load: 29.0 t ADT: 100

IRR - US 212

Fair

Over: MUDDY CREEK

5M W LAME DEER, Big Horn, MT

Built 1974 Load: 29.0 t ADT: 2,542

IRR - S 451

Fair

Over: LITTLE BIGHORN RIVER

4M N WYOLA, Big Horn, MT

Built 1950 Load: 29.0 t ADT: 380

YANTIC RD

Fair

Over: RED ROCK COULEE 002

4M NE LOHMAN, Blaine, MT

Built 1933 Load: 29.0 t ADT: 40

US 2

Fair

Over: RED ROCK CREEK OVERFLOW

CHINOOK, Blaine, MT

Built 1942 Load: 29.0 t ADT: 2,818

S 529-CLEAR CR RD

Fair

Over: RED ROCK CREEK

CHINOOK, Blaine, MT

Built 1967 Load: 29.0 t ADT: 254

ASHUELOT HILL RD

Fair

Over: BENCH SOUTH CANAL 066

9M E FAIRFIELD, Cascade, MT

Built 1950 Load: 29.0 t ADT: 26

MT 21

Fair

Over: FORT SHAW CANAL 110

3M W SIMMS, Cascade, MT

Built 1934 Load: 29.0 t ADT: 418

MT 21

Fair

Over: SIMMS CREEK 112

2M W SIMMS, Cascade, MT

Built 1934 Load: 29.0 t ADT: 418

S 59

Fair

Over: GRIMES CREEK

17M NW MILES CITY, Custer, MT

Built 1962 Load: 29.0 t ADT: 1,250

DRY CREEK ROAD

Fair

Over: DRY CREEK

NW GLENDIVE, Dawson, MT

Built 1970 Load: 29.0 t ADT: 245

I 94

Fair

Over: DRY CREEK

W GLENDIVE, Dawson, MT

Built 1969 Load: 29.0 t ADT: 3,275

S 200

Fair

Over: DRAINAGE

10M SW RICHEY, Dawson, MT

Built 1959 Load: 29.0 t ADT: 305

S 254

Fair

Over: REDWATER RIVER

11.1M NW RICHEY, Dawson, MT

Built 2014 Load: 29.0 t ADT: 66

CRACKERVILLE RD

Fair

Over: RR 001

4M S OPPORTUNITY, Deer Lodge, MT

Built 1946 Load: 29.0 t ADT: 515

MAIN ST S

Fair

Over: SANDSTONE CREEK

SOUTH PLEVNA, Fallon, MT

Built 1964 Load: 29.0 t ADT: 118

SALT CREEK RD

Fair

Over: SALT CREEK 053

7M NW SUFFOLK, Fergus, MT

Built 1984 Load: 29.0 t ADT: 100

US 191

Fair

Over: BOX ELDER CREEK

2M E ROY, Fergus, MT

Built 1942 Load: 29.0 t ADT: 287

US 87

Fair

Over: DRAINAGE

7M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 29.0 t ADT: 1,300

Showing 2,051-2,100 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.