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

TAUCK RD

Good

Over: BOX ELDER CREEK 023

21M NE HAMMOND, Carter, MT

Built 2013 Load: 26.3 t ADT: 100

N FORT SHAW RD

Good

Over: SUN RIVER 063

FORT SHAW, Cascade, MT

Built 1998 Load: 26.3 t ADT: 100

HUGHESVILLE RD

Good

Over: DRY FORK BELT CREEK 101

5M E MONARCH, Cascade, MT

Built 1962 Load: 26.3 t ADT: 100

SIMMS FAIRFIELD RD

Good

Over: SUN RIVER

SIMMS, Cascade, MT

Built 1983 Load: 26.3 t ADT: 472

S 200S

Good

Over: SPRING CREEK

2 M SE OF LINDSAY, Dawson, MT

Built 1966 Load: 26.3 t ADT: 980

I 90

Good

Over: CLARK FORK RIVER

2.5M N OPPORTUNITY, Deer Lodge, MT

Built 1978 Load: 26.3 t ADT: 5,053

IRR - US 89

Good

Over: KENNEDY CREEK

3M N BABB, Glacier, MT

Built 1976 Load: 26.3 t ADT: 2,203

ROTHIEMAY RD

Good

Over: CARELESS CREEK

5M N RYEGATE, Golden Valley, MT

Built 1967 Load: 26.3 t ADT: 55

MISSION DAM ROAD

Good

Over: MISSION CREEK

2M E ST IGNATIUS, Lake, MT

Built 2021 Load: 26.3 t ADT: 100

LITTLE WOLF CR RD

Good

Over: WOLF CREEK 145

7M NW WOLF CREEK, Lewis and Clark, MT

Built 2007 Load: 26.3 t ADT: 128

S 200

Good

Over: MIDDLE FK DEARBORN RIVER

25M NE LINCOLN, Lewis and Clark, MT

Built 1993 Load: 26.3 t ADT: 1,356

SILVER BUTTE RD

Good

Over: FISHER RIVER 075

18M SE LIBBY, Lincoln, MT

Built 1938 Load: 26.3 t ADT: 100

SOUTHSIDE RD

Good

Over: DRY CREEK 002

5M W SUPERIOR, Mineral, MT

Built 1962 Load: 26.3 t ADT: 293

SHIELDS RIVER ROAD

Good

Over: IRRIGATION CANAL

5M SE CLYDE PARK, Park, MT

Built 2019 Load: 26.3 t ADT: 100

US 89

Good

Over: WILLOW CREEK

7M SE CLYDE PARK, Park, MT

Built 1984 Load: 26.3 t ADT: 1,430

S 500

Good

Over: FLATWILLOW CREEK

6M SW MOSBY, Petroleum, MT

Built 1962 Load: 26.3 t ADT: 31

W FORK RD

Good

Over: W FORK BITTERROOT R 003

9M SW CONNER, Ravalli, MT

Built 2004 Load: 26.3 t ADT: 46

US 93

Good

Over: MCCALLA CREEK

5M N VICTOR, Ravalli, MT

Built 2010 Load: 26.3 t ADT: 12,937

COUNTY ROAD 126

Good

Over: USBR MAIN CANAL 054

1M N SIDNEY, Richland, MT

Built 2013 Load: 26.3 t ADT: 485

MAIN ST

Good

Over: USBR MAIN CANAL 051

EAST EDGE SAVAGE, Richland, MT

Built 1992 Load: 26.3 t ADT: 53

US 12

Good

Over: EAST SPRING COULEE

11M NW FORSYTH, Rosebud, MT

Built 2012 Load: 26.3 t ADT: 226

US 12

Good

Over: DRAINAGE

9M NW FORSYTH, Rosebud, MT

Built 2012 Load: 26.3 t ADT: 226

9TH LN NE

Good

Over: MUDDY CREEK 115

4M W POWER, Teton, MT

Built 1982 Load: 26.3 t ADT: 26

2ND LN SE

Good

Over: GREENFIELD CANAL 053

2M SE FAIRFIELD, Teton, MT

Built 1938 Load: 26.3 t ADT: 14

US 191

Good

Over: ABANDONED RR

HARLOWTON, Wheatland, MT

Built 1969 Load: 26.3 t ADT: 800

S 8TH RD

Good

Over: HUNTLEY MAIN CANAL

4M NE HUNTLEY, Yellowstone, MT

Built 2020 Load: 26.3 t ADT: 164

RAMP TO W I 90

Good

Over: SHILOH INTERCHANGE

BILLINGS, Yellowstone, MT

Built 2001 Load: 26.3 t ADT: 2,039

BENDER RD

Good

Over: BLUE CREEK 017

5M SE BILLINGS, Yellowstone, MT

Built 2015 Load: 26.3 t ADT: 100

MAILBOX RD

Good

Over: CROOKED CREEK 088

6M NW SHEPHERD, Yellowstone, MT

Built 2014 Load: 26.3 t ADT: 100

CHICAGO RD

Good

Over: TWELVE MILE CREEK 093

4M SW SHEPHERD, Yellowstone, MT

Built 1989 Load: 26.3 t ADT: 100

CLARK RD

Good

Over: CROOKED CREEK 080

2M NE SHEPHERD, Yellowstone, MT

Built 2012 Load: 26.3 t ADT: 100

OLD US 87

Good

Over: PRYOR CREEK 069

8M SE BILLINGS, Yellowstone, MT

Built 1979 Load: 26.3 t ADT: 561

BUFFALO TRAIL RD

Good

Over: CANYON CREEK

9M W BILLINGS, Yellowstone, MT

Built 1968 Load: 26.3 t ADT: 852

FOREST ROAD

Good

Over: COAL CREEK

NORTH FORK FLATHEAD, Flathead, MT

Built 2000 Load: 26.6 t ADT: 5

FOREST ROAD

Good

Over: CEDAR CREEK

FATTY-PIPER CONNECTOR, Lake, MT

Built 1985 Load: 26.6 t ADT: 10

THOMPSON CR RD

Good

Over: S FK FISH CREEK

THOMPSON CR FISH CR, Mineral, MT

Built 1999 Load: 26.6 t ADT: 50

COTTONWOOD LK RD

Good

Over: COTTONWOOD CREEK

COTTONWOOD LAKES, Powell, MT

Built 2007 Load: 26.6 t ADT: 40

HAMILTON HEIGHTS R

Good

Over: BITTERROOT CANAL 057

3M SE CORVALLIS, Ravalli, MT

Built 1992 Load: 26.6 t ADT: 100

SAGE RD

Good

Over: BATTLE CREEK 052

15M N CHINOOK, Blaine, MT

Built 2009 Load: 26.9 t ADT: 100

NO DATA ENTERED

Good

Over: EAST ROSEBUD CREEK

NO DATA ENTERED, Carbon, MT

Built 2007 Load: 26.9 t ADT: 40

MILL CREEK ROAD

Good

Over: ANDERSON CREEK

NO DATA ENTERED, Gallatin, MT

Built 2009 Load: 26.9 t ADT: 40

NO DATA ENTERED

Good

Over: PACKER CREEK

NO DATA ENTERED, Mineral, MT

Built 1980 Load: 26.9 t ADT: 50

NO DATA ENTERED

Good

Over: PICKET PIN CREEK

NO DATA ENTERED, Sweet Grass, MT

Built 2010 Load: 26.9 t ADT: 40

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Beaverhead, MT

Built 2008 Load: 27.2 t ADT: 50

CO RD 002 FH 73

Good

Over: GRASSHOPPER CREEK 016

25M NW DILLON, Beaverhead, MT

Built 1998 Load: 27.2 t ADT: 243

TURNER RD

Good

Over: WOODY ISLAND CREEK

6M N TURNER, Blaine, MT

Built 1981 Load: 27.2 t ADT: 152

SALEM RD

Good

Over: BELT CREEK 071

16M NE GREAT FALLS, Cascade, MT

Built 1998 Load: 27.2 t ADT: 100

UPPER HIGHWOOD CR

Good

Over: HIGHWOOD CREEK 041

11M SE HIGHWOOD, Chouteau, MT

Built 2005 Load: 27.2 t ADT: 100

GAP RD

Good

Over: HIGHWOOD CREEK 042

8M S BIG SAG, Chouteau, MT

Built 2005 Load: 27.2 t ADT: 100

LOWER MARIS RD

Good

Over: TETON RIVER 011

1M SW LOMA, Chouteau, MT

Built 1992 Load: 27.2 t ADT: 100

Showing 3,701-3,750 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.