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

US 93

Fair

Over: BITTERROOT RIVER

2M N HAMILTON, Ravalli, MT

Built 2005 Load: 30.8 t ADT: 14,663

COUNTY ROAD 074

Fair

Over: DRAINAGE 031

12M NW SIDNEY, Richland, MT

Built 1994 Load: 30.8 t ADT: 100

S 16

Fair

Over: N FORK 1ST HAY CREEK

13M NW SIDNEY, Richland, MT

Built 2003 Load: 30.8 t ADT: 1,074

LIL PORCUPINE CR R

Fair

Over: LITTLE PORCUPINE CR 014

11M N FORSYTH, Rosebud, MT

Built 1978 Load: 30.8 t ADT: 223

NO DATA ENTERED

Fair

Over: WHITEPINE CR

NO DATA ENTERED, Sanders, MT

Built 1961 Load: 30.8 t ADT: 50

SLOAN RD

Fair

Over: FLATHEAD RIVER 075

10M W RONAN, Sanders, MT

Built 1972 Load: 30.8 t ADT: 100

S 43

Fair

Over: BIG HOLE RIVER

3M W DIVIDE, Silver Bow, MT

Built 1968 Load: 30.8 t ADT: 576

OLD US 10

Fair

Over: COULEE CREEK 023

7M E REED POINT, Stillwater, MT

Built 1931 Load: 30.8 t ADT: 100

BOULDER RD

Fair

Over: MILLER CREEK 001

19M S MCLEOD, Sweet Grass, MT

Built 1965 Load: 30.8 t ADT: 156

BRIDGER CREEK RD

Fair

Over: BRIDGER CREEK 054

15M S GREYCLIFF, Sweet Grass, MT

Built 2004 Load: 30.8 t ADT: 100

OLD US 10

Fair

Over: SPRING CREEK 035

2M NW GREYCLIFF, Sweet Grass, MT

Built 1936 Load: 30.8 t ADT: 342

US 287

Fair

Over: DEEP CREEK

3M S CHOTEAU, Teton, MT

Built 1965 Load: 30.8 t ADT: 529

I 15

Fair

Over: RR

1M N SUNBURST, Toole, MT

Built 1961 Load: 30.8 t ADT: 862

US 2

Fair

Over: CHERRY CREEK OVERFLOW

1M N GLASGOW, Valley, MT

Built 1980 Load: 30.8 t ADT: 6,660

US 2

Fair

Over: CHERRY CREEK

1M N GLASGOW, Valley, MT

Built 1979 Load: 30.8 t ADT: 6,660

EDGE HILL RD E

Fair

Over: BEAVER CREEK 017

18M S WIBAUX, Wibaux, MT

Built 1997 Load: 30.8 t ADT: 100

S 7

Fair

Over: RATTLESNAKE CREEK

22M S WIBAUX, Wibaux, MT

Built 1942 Load: 30.8 t ADT: 624

I 90

Fair

Over: PRYOR CREEK

9.3M E BILLINGS, Yellowstone, MT

Built 1969 Load: 30.8 t ADT: 4,191

I 90

Fair

Over: PRYOR CREEK

9.3M E BILLINGS, Yellowstone, MT

Built 1969 Load: 30.8 t ADT: 4,191

I 94

Fair

Over: FLY CREEK

2.5M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 Load: 30.8 t ADT: 2,385

I 94

Fair

Over: FLY CREEK

2.5M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 Load: 30.8 t ADT: 2,385

DUCK CREEK RD

Fair

Over: YELLOWSTONE RIVER 020

SW BILLINGS, Yellowstone, MT

Built 1991 Load: 30.8 t ADT: 100

OLD HWY 312

Fair

Over: SEVEN MILE CREEK 168

5M SW HUNTLEY, Yellowstone, MT

Built 1947 Load: 30.8 t ADT: 7,499

MARTINSDALE RD

Fair

Over: S FK MUSSLESHELL OVF 040

MARTINSDALE, Meagher, MT

Built 2009 Load: 30.9 t ADT: 100

S COFFEE CR RD

Fair

Over: WOLF CREEK 076

4M S COFFEE CREEK, Fergus, MT

Built 1979 Load: 31.1 t ADT: 34

NO DATA ENTERED

Fair

Over: MIDDLE FORK ROCK CR

MIDDLE FORK ROCK CR, Granite, MT

Built 1965 Load: 31.1 t ADT: 40

I 15

Fair

Over: BIG HOLE RIVER

7.4M S MELROSE, Madison, MT

Built 1973 Load: 31.1 t ADT: 1,902

I 15

Fair

Over: BIG HOLE RIVER

7.4M S MELROSE, Madison, MT

Built 1973 Load: 31.1 t ADT: 1,902

W.FORK MILL CR.RD.

Fair

Over: W.FORK MILL CREEK

S. OF LIVINGSTON, Park, MT

Built 1971 Load: 31.4 t ADT: 50

TWO MEDICINE ROAD

Fair

Over: TWO MEDICINE RIVER

5.3 miles northwest of Mo, Glacier, MT

Built 1950 Load: 31.7 t ADT: 183

DEARBORN CANYON RD

Fair

Over: FALLS CREEK 049

2M SW BEAN LAKE, Lewis and Clark, MT

Built 1960 Load: 31.7 t ADT: 117

OUTLOOK BENCH RD

Fair

Over: PLENTYWOOD CREEK 014

2M NE OUTLOOK, Sheridan, MT

Built 1970 Load: 31.7 t ADT: 100

S FRONTAGE RD

Fair

Over: HOGAN`S SLOUGH

BILLINGS-S FRONTAGE RD, Yellowstone, MT

Built 1958 Load: 31.7 t ADT: 2,335

OLD STAGE RD

Fair

Over: LOCAL DRAINAGE 048

E BARRETTS INT, Beaverhead, MT

Built 1959 Load: 31.8 t ADT: 292

IRR - I 90

Fair

Over: RR (NOT IN USE)

HARDIN, Big Horn, MT

Built 1971 Load: 31.8 t ADT: 3,652

IRR - I 90

Fair

Over: RR (NOT IN USE)

HARDIN, Big Horn, MT

Built 1971 Load: 31.8 t ADT: 3,652

PASS CREEK RD

Fair

Over: PASS CREEK 021

5M SE WYOLA, Big Horn, MT

Built 1979 Load: 31.8 t ADT: 108

US 12

Fair

Over: DEEP CREEK

18M NE TOWNSEND, Broadwater, MT

Built 2014 Load: 31.8 t ADT: 707

US 12

Fair

Over: DEEP CREEK

18M NE TOWNSEND, Broadwater, MT

Built 2014 Load: 31.8 t ADT: 707

US 310

Fair

Over: BRIDGER CREEK

2M S BRIDGER, Carbon, MT

Built 1971 Load: 31.8 t ADT: 2,245

S 72

Fair

Over: CLARKS FORK YELLOWSTONE

5M S BELFRY, Carbon, MT

Built 1970 Load: 31.8 t ADT: 1,498

US 212

Fair

Over: LITTLE MISSOURI RIVER

1M NW ALZADA, Carter, MT

Built 1965 Load: 31.8 t ADT: 2,509

S 7

Fair

Over: LITTLE BEAVER CREEK

6M NE EKALAKA, Carter, MT

Built 2010 Load: 31.8 t ADT: 390

SIMMS ASHUELOT RD

Fair

Over: BLACKFOOT COULEE 053

2M NE SIMMS, Cascade, MT

Built 1976 Load: 31.8 t ADT: 100

MT 21

Fair

Over: HEPPLER COULEE 109

4M W SIMMS, Cascade, MT

Built 1934 Load: 31.8 t ADT: 418

HIGHWOOD RD

Fair

Over: RED COULEE

13M E GREAT FALLS, Cascade, MT

Built 1941 Load: 31.8 t ADT: 549

I 90

Fair

Over: WARM SPRINGS-EB INT RAMP

WARM SPRINGS, Deer Lodge, MT

Built 1978 Load: 31.8 t ADT: 94

S 273

Fair

Over: WARM SPRINGS CREEK

2M NE ANACONDA, Deer Lodge, MT

Built 1988 Load: 31.8 t ADT: 975

S 322

Fair

Over: LITTLE BEAVER CREEK

16M S BAKER, Fallon, MT

Built 1992 Load: 31.8 t ADT: 42

US 87

Fair

Over: BOYD CREEK

1M E LEWISTOWN, Fergus, MT

Built 1942 Load: 31.8 t ADT: 2,908

Showing 2,301-2,350 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.