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 191

Fair

Over: ROSS FORK CREEK

2M N JUDITH GAP, Fergus, MT

Built 1990 Load: 99.9 t ADT: 2,077

I 90

Fair

Over: WALKING PATH

BOZEMAN, Gallatin, MT

Built 2011 Load: 99.9 t ADT: 10,307

S 59

Fair

Over: THOMPSON CREEK

36M SE JORDAN, Garfield, MT

Built 1997 Load: 99.9 t ADT: 293

MT 200

Fair

Over: DOG CREEK

4M E MOSBY, Garfield, MT

Built 1985 Load: 99.9 t ADT: 532

S BARBER RD

Fair

Over: FISH CREEK 022

5M S BARBER, Golden Valley, MT

Built 1983 Load: 99.9 t ADT: 49

COUNTY RD 332

Fair

Over: LODGE CREEK 038

26M N HAVRE, Hill, MT

Built 1986 Load: 99.9 t ADT: 100

EAGLE PASS TRAIL

Fair

Over: S KICKING HORSE RES 010

6M SE RONAN, Lake, MT

Built 1991 Load: 99.9 t ADT: 100

I 15

Fair

Over: WOLF CREEK

WOLF CREEK, Lewis and Clark, MT

Built 1966 Load: 99.9 t ADT: 5,043

S 21

Fair

Over: SPRING CREEK COULEE 124

5M E AUGUSTA, Lewis and Clark, MT

Built 1982 Load: 99.9 t ADT: 258

US 287

Fair

Over: ROCK CREEK

3M NE WOLF CREEK, Lewis and Clark, MT

Built 1967 Load: 99.9 t ADT: 561

US 2

Fair

Over: BEAVER CREEK OVERFLOW

2M E SACO, Phillips, MT

Built 1987 Load: 99.9 t ADT: 1,210

I 15

Fair

Over: S PONDERA COULEE

3M N BRADY, Pondera, MT

Built 1964 Load: 99.9 t ADT: 3,206

I 90

Fair

Over: DEMPSEY CREEK

N SAGER LANE OVERPASS, Powell, MT

Built 1973 Load: 99.9 t ADT: 10,571

I 94

Fair

Over: ASH CREEK

2M E TERRY, Prairie, MT

Built 1969 Load: 99.9 t ADT: 3,828

MERIDIAN RD

Fair

Over: FRED BURR CREEK 109

5M S VICTOR, Ravalli, MT

Built 2009 Load: 99.9 t ADT: 100

ORCHARD DR

Fair

Over: BLODGETT CREEK 013

2M N HAMILTON, Ravalli, MT

Built 1987 Load: 99.9 t ADT: 100

S 16

Fair

Over: GARDEN COULEE-STOCKPASS

1M S SAVAGE, Richland, MT

Built 1975 Load: 99.9 t ADT: 2,407

S 201

Fair

Over: LONG GRASS CREEK

18M N RICHEY, Richland, MT

Built 1957 Load: 99.9 t ADT: 39

IRR - US 2

Fair

Over: MOSQUITO CREEK

1M E WOLF POINT, Roosevelt, MT

Built 1986 Load: 99.9 t ADT: 4,429

IRR - US 2

Fair

Over: LITTLE WOLF CREEK

2M E WOLF POINT, Roosevelt, MT

Built 1988 Load: 99.9 t ADT: 4,429

S 16

Fair

Over: LOST CREEK

3M N FROID, Roosevelt, MT

Built 1976 Load: 99.9 t ADT: 872

IRR - S 13

Fair

Over: CHELSEA CREEK

18M NE WOLF POINT, Roosevelt, MT

Built 1992 Load: 99.9 t ADT: 366

S 16

Fair

Over: ATOR CREEK

3M NW ANTELOPE, Sheridan, MT

Built 1984 Load: 99.9 t ADT: 1,481

I 90

Fair

Over: WHITETAIL CREEK

1M E WHITEHALL, Silver Bow, MT

Built 1965 Load: 99.9 t ADT: 10,289

BOOTLEGGER TRAIL

Fair

Over: WILLOW CREEK 009

2M S GALATA, Toole, MT

Built 1987 Load: 99.9 t ADT: 100

US 2

Fair

Over: BEAVER CREEK OVERFLOW

6M NW HINSDALE, Valley, MT

Built 1987 Load: 99.9 t ADT: 1,244

US 2

Fair

Over: GOUDGE COULEE

4M SE GLASGOW, Valley, MT

Built 1994 Load: 99.9 t ADT: 2,100

IRR - S 438

Fair

Over: E FORK PORCUPINE CREEK

27M N NASHUA, Valley, MT

Built 1983 Load: 99.9 t ADT: 77

I 94

Fair

Over: YATES CREEK

1M E WIBAUX, Wibaux, MT

Built 1962 Load: 99.9 t ADT: 3,583

I 94

Fair

Over: YATES CREEK

2M E WIBAUX, Wibaux, MT

Built 2000 Load: 99.9 t ADT: 3,583

I 90

Fair

Over: CITY COUNTY DRAIN DITCH

BILLINGS, Yellowstone, MT

Built 1966 Load: 99.9 t ADT: 27,814

OLD HWY 312

Fair

Over: BBWA CANAL 167

5M NE BILLINGS, Yellowstone, MT

Built 2005 Load: 99.9 t ADT: 7,499

NO DATA ENTERED

Good

Over: BIG HOLE RIVER

NO DATA ENTERED, Beaverhead, MT

Built 2022 ADT: 50

NO DATA ENTERED

Good

Over: CANYON CREEK

NO DATA ENTERED, Beaverhead, MT

Built 2023 ADT: 50

S384

Good

Over: Dry Creek

7M E Hardin, Big Horn, MT

Built 2023 ADT: 199

East Side Road

Good

Over: Rock Creek

4M S RED LODGE, Carbon, MT

Built 2023 ADT: 100

East Side Road

Good

Over: Rock Creek

7M S Red Lodge, Carbon, MT

Built 2023 ADT: 100

Meeteetse Trail

Good

Over: Rock Creek

1M SE of Red Lodge, Carbon, MT

Built 2023 ADT: 100

CROW CREEK ROAD

Good

Over: DRY CREEK

20.7M N HAMMOND, Carter, MT

Built 2015 ADT: 100

UPPER HIGHWOOD CR

Good

Over: HIGHWOOD CREEK 040

4M SE HIGHWOOD, Chouteau, MT

Built 2023 ADT: 100

SHEEP CREEK RD

Good

Over: SHEEP CREEK

36M E MILES CITY, Custer, MT

Built 2023 ADT: 22

S 248

Good

Over: DRAINAGE

7M E RICHLAND, Daniels, MT

Built 2023 ADT: 193

S 248

Good

Over: BUTTE CREEK

3M W SCOBEY, Daniels, MT

Built 2023 ADT: 390

S 248

Good

Over: Drainage

5m east of Richland, Daniels, MT

Built 2023 ADT: 193

S 248

Good

Over: Spring Creek

2 M west of Four Buttes, Daniels, MT

Built 2023 ADT: 100

S 248

Good

Over: Drainage

2 Miles West of Scobey, Daniels, MT

Built 2023 ADT: 507

NO DATA ENTERED

Good

Over: WARM SPRINGS CR

ROAD TO REC RESIDENCE, Deer Lodge, MT

Built 2016 ADT: 50

ISMAY RD

Good

Over: COTTONWOOD CREEK

3.9M S ISMAY, Fallon, MT

Built 2023 ADT: 38

BONNIEVALE RD

Good

Over: SANDSTONE CREEK

N BAKER, Fallon, MT

Built 2023 ADT: 100

FORST ROAD

Good

Over: FELIX CREEK

EAST SIDE SOUTHFORK, Flathead, MT

Built 1997 ADT: 200

Showing 3,301-3,350 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.