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 327

Good

Over: LITTLE MUDDY CREEK

3M SE BAINVILLE, Roosevelt, MT

Built 2020 Load: 46.3 t ADT: 280

I 15

Good

Over: SILVERBOW CREEK-RR

1.2 N W BUTTE, Silver Bow, MT

Built 2019 Load: 46.3 t ADT: 6,807

NO DATA ENTERED

Good

Over: WARM SPRINGS CR

HIGHWAY ENTERANCE TO AJC, Deer Lodge, MT

Built 1979 Load: 46.7 t ADT: 50

ROAD 522

Good

Over: BARNUM CR

522 AT .6 MP, Flathead, MT

Built 1986 Load: 47.0 t ADT: 50

FIELDS GULCH ROAD

Good

Over: POORMAN CREEK

FIELDS GULCH ROAD, Lewis and Clark, MT

Built 2013 Load: 47.0 t ADT: 20

US 287

Good

Over: SIX MILE CREEK

1M N TOSTON, Broadwater, MT

Built 2020 Load: 47.2 t ADT: 4,885

US 87

Good

Over: OTTER CREEK

3M SE BELT, Cascade, MT

Built 1959 Load: 47.2 t ADT: 1,078

US 87

Good

Over: OTTER CREEK

4M SE BELT, Cascade, MT

Built 1959 Load: 47.2 t ADT: 1,078

S 200

Good

Over: OLIVER COULEE

4M E JORDAN, Garfield, MT

Built 2004 Load: 47.2 t ADT: 514

CAMP NINE RD

Good

Over: ST MARY RIVER 054

7M N BABB, Glacier, MT

Built 2008 Load: 47.2 t ADT: 100

US 2

Good

Over: SAGE CREEK

GILDFORD, Hill, MT

Built 1958 Load: 47.2 t ADT: 1,313

RIVULET RD

Good

Over: FISH CREEK 058

2M E RIVULET, Mineral, MT

Built 1986 Load: 47.2 t ADT: 349

PRAIRIE VIEW DR

Good

Over: SANDSTONE CREEK 059

W EDGE BAKER, Fallon, MT

Built 2012 Load: 48.1 t ADT: 100

NORTH FORK RD

Good

Over: COAL CREEK 052

8M SE POLEBRIDGE, Flathead, MT

Built 1979 Load: 48.1 t ADT: 530

COUNTY ROAD 141

Good

Over: S FK SANDSTONE CREEK 048

8M SE PLEVNA, Fallon, MT

Built 2012 Load: 49.0 t ADT: 100

CAMP CREEK RD

Good

Over: CAMP CREEK 017

AMSTERDAM, Gallatin, MT

Built 2002 Load: 49.0 t ADT: 100

S 508 FH 62

Good

Over: CYCLONE CREEK

15M SW YAAK, Lincoln, MT

Built 1994 Load: 49.0 t ADT: 255

WILLOUGHBY LN

Good

Over: SUPPLY DITCH 085

4M S STEVENSVILLE, Ravalli, MT

Built 2014 Load: 49.0 t ADT: 629

AIRPORT RD

Good

Over: E GALLATIN RIVER 097

3M E BELGRADE, Gallatin, MT

Built 2012 Load: 49.2 t ADT: 100

IRR - S 313

Good

Over: SOAP CREEK

9M SW ST XAVIER, Big Horn, MT

Built 1963 Load: 49.9 t ADT: 617

US 87

Good

Over: OTTER CREEK

3M SE BELT, Cascade, MT

Built 1959 Load: 49.9 t ADT: 1,078

S 13

Good

Over: DRAINAGE

1M N VIDA, McCone, MT

Built 1994 Load: 49.9 t ADT: 896

IRR BIA RTE 30

Good

Over: BOX ELDER CREEK

8.4 KM NW OF ROCKY BOYS, Chouteau, MT

Built 2012 Load: 50.0 t ADT: 200

US 87

Good

Over: OTTER CREEK

5M SE BELT, Cascade, MT

Built 1959 Load: 50.8 t ADT: 1,078

US 12

Good

Over: TEN MILE CREEK

5M W HELENA, Lewis and Clark, MT

Built 1988 Load: 50.8 t ADT: 4,915

S 200

Good

Over: WILDLIFE CROSSING

6M NE LINCOLN, Lewis and Clark, MT

Built 2014 Load: 50.8 t ADT: 1,761

S 200

Good

Over: WILDLIFE CROSSING

9M NE LINCOLN, Lewis and Clark, MT

Built 2014 Load: 50.8 t ADT: 1,761

US 93

Good

Over: WILDLIFE UNDERPASS

10M N WYE INT, Missoula, MT

Built 2009 Load: 50.8 t ADT: 8,184

E HIGHWOOD RD

Good

Over: LITTLE BELT CREEK 004

3M E BELT, Cascade, MT

Built 1971 Load: 51.2 t ADT: 100

N MONTANA AVE

Good

Over: TEN MILE CREEK

2M N HELENA, Lewis and Clark, MT

Built 2004 Load: 51.2 t ADT: 11,526

DRY FORK RD

Good

Over: PENNEL CREEK 023

9M NW PLEVNA, Fallon, MT

Built 2016 Load: 51.7 t ADT: 100

US 2

Good

Over: SPRING CREEK

3M E DODSON, Phillips, MT

Built 2008 Load: 51.7 t ADT: 1,189

S 484

Good

Over: BEAR CREEK

30M SE ASHLAND, Powder River, MT

Built 1999 Load: 51.7 t ADT: 20

US 93

Good

Over: WILDLIFE UPASS-RELIEF

1M N RAVALLI, Lake, MT

Built 2006 Load: 52.6 t ADT: 6,822

S 80

Good

Over: DRAINAGE

11M SE FORT BENTON, Chouteau, MT

Built 1995 Load: 53.5 t ADT: 361

GLACIER INSTITUTE

Good

Over: MCDONALD CREEK

Approximately 1.2 miles n, Flathead, MT

Built 2000 Load: 53.5 t ADT: 75

I 90

Good

Over: HARVEY CREEK

3M E BEARMOUTH INT, Granite, MT

Built 1970 Load: 53.5 t ADT: 11,980

JEWETT LN

Good

Over: IRRIGATION CANAL 008

NW WILLOW CREEK, Jefferson, MT

Built 2021 Load: 53.5 t ADT: 100

I 15

Good

Over: TEN MILE CREEK

4M N HELENA, Lewis and Clark, MT

Built 1962 Load: 53.5 t ADT: 6,190

I 15

Good

Over: TEN MILE CREEK

4M N HELENA, Lewis and Clark, MT

Built 1962 Load: 53.5 t ADT: 6,190

OLD YELLOWSTONE TR

Good

Over: ROCK CREEK

18 M NW GARDINER, Park, MT

Built 2018 Load: 53.5 t ADT: 100

BAGAN RD

Good

Over: CORRAL COULEE 063

22M N CHINOOK, Blaine, MT

Built 2013 Load: 54.4 t ADT: 83

AG LANE

Good

Over: SANDSTONE CREEK 056

1M W BAKER, Fallon, MT

Built 2014 Load: 54.4 t ADT: 100

OLD MILL LOOP

Good

Over: RR 056

ST REGIS, Mineral, MT

Built 1999 Load: 54.4 t ADT: 100

US 89

Good

Over: MATCHETT COULEE

1M SE DUPUYER, Pondera, MT

Built 2006 Load: 54.4 t ADT: 485

VERMILION RIV RD

Good

Over: CANYON CREEK 104

4M E TROUT CREEK, Sanders, MT

Built 1961 Load: 54.4 t ADT: 100

RD 257

Good

Over: PLEASANT VALLEY FISHER

MP 3.2 ON 257/LARSON RES, Lincoln, MT

Built 1979 Load: 55.1 t ADT: 40

N LAST CHANCE GULC

Good

Over: RR

HELENA, Lewis and Clark, MT

Built 2003 Load: 55.3 t ADT: 18,187

WINTERS LANE

Good

Over: SUPPLY DITCH 065

2M S STEVENSVILLE, Ravalli, MT

Built 1994 Load: 55.3 t ADT: 120

MERIDIAN RD

Good

Over: SWEATHOUSE CREEK 099

VICTOR-MERIDIAN RD, Ravalli, MT

Built 1973 Load: 55.8 t ADT: 100

Showing 4,651-4,700 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.