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 3

Good

Over: NORTH FORK ALKALI CREEK

8M NW BILLINGS, Yellowstone, MT

Built 1992 Load: 89.8 t ADT: 2,553

S 5

Good

Over: DRAINAGE

4M E FLAXVILLE, Daniels, MT

Built 2011 Load: 90.7 t ADT: 321

BELLVIEW RD

Good

Over: SEVEN MILE COULEE 130

6M SW CHOTEAU, Teton, MT

Built 1962 Load: 93.4 t ADT: 100

US 212

Good

Over: PUMPKIN CREEK

20M W BROADUS, Powder River, MT

Built 2012 Load: 95.3 t ADT: 2,086

I 15

Good

Over: ROCK CREEK

3M N WOLF CREEK, Lewis and Clark, MT

Built 1967 Load: 98.0 t ADT: 4,253

US 310

Good

Over: SAND CREEK

4M S FROMBERG, Carbon, MT

Built 1987 Load: 99.9 t ADT: 4,760

GIANT SPRINGS RD

Good

Over: RIVERS EDGE TRAIL

GREAT FALLS, Cascade, MT

Built 2002 Load: 99.9 t ADT: 1,068

I 94

Good

Over: VEHICLE PASS

13M NE MILES CITY, Custer, MT

Built 1986 Load: 99.9 t ADT: 4,570

IRR - S 13

Good

Over: MANTERNACH COULEE

2M S SCOBEY, Daniels, MT

Built 1988 Load: 99.9 t ADT: 790

US 87

Good

Over: LITTLE ROCK CR-STOCKPASS

4M NE MOORE, Fergus, MT

Built 2009 Load: 99.9 t ADT: 2,202

US 191

Good

Over: ROSS FORK CREEK

2M S GARNEILL, Fergus, MT

Built 1990 Load: 99.9 t ADT: 2,077

BURGESS RD

Good

Over: WOODY CREEK 017

23M NE JORDAN, Garfield, MT

Built 1996 Load: 99.9 t ADT: 100

GOING-TO-THE-SUN R

Good

Over: ROSE CREEK

6.2 miles southwest from, Glacier, MT

Built 2013 Load: 99.9 t ADT: 1,942

I 90

Good

Over: DRAINAGE

4.8M E BEARMOUTH INT, Granite, MT

Built 1971 Load: 99.9 t ADT: 11,980

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

2M S ST IGNATIUS, Lake, MT

Built 2006 Load: 99.9 t ADT: 6,822

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

2M S ST IGNATIUS, Lake, MT

Built 2006 Load: 99.9 t ADT: 6,822

MT Route S-366

Good

Over: Tiber Dam Spillway

14.6 mi. SW of Chester MT, Liberty, MT

Built 1954 Load: 99.9 t ADT: 75

S 567-PIPE CR RD

Good

Over: PIPE CREEK

14M N LIBBY, Lincoln, MT

Built 1968 Load: 99.9 t ADT: 213

I 90

Good

Over: DRAINAGE

ST. REGIS, Mineral, MT

Built 1986 Load: 99.9 t ADT: 6,360

US 12

Good

Over: DRAINAGE

12M W ROUNDUP, Musselshell, MT

Built 2006 Load: 99.9 t ADT: 438

US 12

Good

Over: DRAINAGE

1M N MUSSELSHELL, Musselshell, MT

Built 2003 Load: 99.9 t ADT: 477

S 59

Good

Over: ROAD CREEK-STOCKPASS

6M NW BROADUS, Powder River, MT

Built 2001 Load: 99.9 t ADT: 849

US 212

Good

Over: E FORK OTTER CREEK

5M E ASHLAND, Powder River, MT

Built 1992 Load: 99.9 t ADT: 2,189

S 484

Good

Over: BEAR CREEK

30M SE ASHLAND, Powder River, MT

Built 1999 Load: 99.9 t ADT: 20

IRR - US 2

Good

Over: DRAINAGE

2M W BROCKTON, Roosevelt, MT

Built 1970 Load: 99.9 t ADT: 1,362

IRR - S 251

Good

Over: KIRN COULEE

22M NE POPLAR, Roosevelt, MT

Built 2008 Load: 99.9 t ADT: 87

S 566-TONGUE R RD

Good

Over: BRIDGE CREEK

4M SW ASHLAND, Rosebud, MT

Built 2004 Load: 99.9 t ADT: 47

I 90

Good

Over: COVE IRRIGATION DITCH

6.2M W PARK CITY, Stillwater, MT

Built 1970 Load: 99.9 t ADT: 10,939

I 94

Good

Over: SEP RR

18.6M E BIGHORN, Treasure, MT

Built 1973 Load: 99.9 t ADT: 4,977

UPPER HIGHWOOD CR

Poor

Over: HIGHWOOD CREEK 076

4M SE HIGHWOOD, Chouteau, MT

Built 1969 ADT: 100

ROAD 290 N

Poor

Over: CANADIAN COULEE 036

30M N INVERNESS, Hill, MT

Built 1980 ADT: 100

NO DATA ENTERED

Poor

Over: MIDDLE FK RUBY RIVER

M FK RUBY RIVER, Madison, MT

Built 1954 ADT: 50

FDR 160

Poor

Over: S.WILLOW CR.

S. WILLOW CR., Madison, MT

Built 1995 ADT: 2

GILBERT CR. RD

Poor

Over: ROCK CREEK

VALLEY OF THE MOON, Missoula, MT

Built 1982 ADT: 50

HWY 91 N

Poor

Over: BIG HOLE RIVER 041

22M N DILLON, Beaverhead, MT

Built 1940 Load: 2.7 t ADT: 155

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

BRIDGE ST

Poor

Over: SWAN RIVER 110

S END BIG FORK, Flathead, MT

Built 1911 Load: 3.6 t ADT: 1,602

ANITA RES ACC RD

Poor

Over: Anita Dam Spillway

7.2 mi E-SE of Ballantine, Yellowstone, MT

Built 1937 Load: 3.6 t ADT: 10

UPPER N FORK RD

Poor

Over: N FK BIGHOLE RIVER 064

6M NW WISDOM, Beaverhead, MT

Built 1977 Load: 4.5 t ADT: 100

BLACKTAIL RD

Poor

Over: EAST BENCH CANAL 006

2M S DILLON, Beaverhead, MT

Built 1962 Load: 4.5 t ADT: 100

W PRYOR RD

Poor

Over: ELBOW CREEK 037

3M W EDGAR, Carbon, MT

Built 1964 Load: 4.5 t ADT: 100

COUNTY ROAD 530

Poor

Over: S FK BURNS CREEK 092

12M NW INTAKE, Dawson, MT

Built 1975 Load: 4.5 t ADT: 100

MT EVANS WAY

Poor

Over: WARM SPRINGS CREEK 016

WARM SPRINGS, Deer Lodge, MT

Built 1912 Load: 4.5 t ADT: 100

6TH AVE S

Poor

Over: BIG SPRING CREEK 133

LEWISTOWN-6TH AVE S, Fergus, MT

Built 1962 Load: 4.5 t ADT: 434

THIRD AVENUE S

Poor

Over: LITTLE CASINO CREEK 138

LEWISTOWN-3RD AVE S, Fergus, MT

Built 2006 Load: 4.5 t ADT: 100

COUNTY ROAD 128

Poor

Over: MUSSELSHELL RIVER 022

2M NE MARTINSDALE, Meagher, MT

Built 1986 Load: 4.5 t ADT: 100

SUNSET HILL RD

Poor

Over: BLACKFOOT RIVER 088

3M S CLEARWATER JCT, Missoula, MT

Built 1907 Load: 4.5 t ADT: 100

SWINGLEY RD

Poor

Over: W BOULDER RIVER 038

18M E LIVINGSTON, Park, MT

Built 1938 Load: 4.5 t ADT: 52

Showing 4,751-4,800 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.