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

THEONY RD

Fair

Over: ROCK CREEK 031

23M W OPHEIM, Valley, MT

Built 2013 Load: 40.8 t ADT: 14

I 90

Fair

Over: HOGAN SLOUGH

BILLINGS, Yellowstone, MT

Built 1959 Load: 40.8 t ADT: 14,785

I 90

Fair

Over: HOGAN SLOUGH

BILLINGS, Yellowstone, MT

Built 1959 Load: 40.8 t ADT: 14,785

NEIBAUER RD

Fair

Over: BBWA CANAL 037

7M NE LAUREL, Yellowstone, MT

Built 1977 Load: 40.8 t ADT: 2,418

WICKS LN

Fair

Over: BBWA CANAL

BILLINGS-WICKS LN, Yellowstone, MT

Built 1988 Load: 40.8 t ADT: 10,325

RD 231

Fair

Over: LIBBY CR

OLD TOWN, Lincoln, MT

Built 1984 Load: 41.1 t ADT: 99

RD 36

Fair

Over: WOLF CR

WOLF CR. MP 16.9 FAIRVIEW, Lincoln, MT

Built 1969 Load: 41.1 t ADT: 50

NORTH FORK RD

Fair

Over: RED MEADOW CREEK 037

3M NW POLEBRIDGE, Flathead, MT

Built 1980 Load: 41.2 t ADT: 394

SOFT ROCK RD

Fair

Over: BITTERROOT CANAL 059

3M E CORVALLIS, Ravalli, MT

Built 1977 Load: 41.6 t ADT: 100

RED ROCK ROAD

Fair

Over: BIG SHEEP CREEK 026

SE DELL, Beaverhead, MT

Built 1931 Load: 41.7 t ADT: 100

IRR - FRONTAGE 325

Fair

Over: LITTLE BIGHORN RIVER 075

2M S CROW AGENCY, Big Horn, MT

Built 1976 Load: 41.7 t ADT: 100

I 94

Fair

Over: TONGUE RIVER

1M S MILES CITY, Custer, MT

Built 1961 Load: 41.7 t ADT: 4,570

CONRAD DR

Fair

Over: FLATHEAD RIVER 013

KALISPELL, Flathead, MT

Built 2009 Load: 41.7 t ADT: 100

ICE POND RD

Fair

Over: BOZEMAN CREEK 122

BOZEMAN-ICE POND RD, Gallatin, MT

Built 2010 Load: 41.7 t ADT: 100

S 205-FRONTAGE RD

Fair

Over: MID FORK MADISON RIVER

2M E THREE FORKS, Gallatin, MT

Built 1990 Load: 41.7 t ADT: 1,473

OLD US HWY 93

Fair

Over: DAYTON CREEK 105

DAYTON, Lake, MT

Built 1930 Load: 41.7 t ADT: 100

I 90 EB

Fair

Over: ST. REGIS RIVER

ST. REGIS, Mineral, MT

Built 1983 Load: 41.7 t ADT: 3,513

I 90

Fair

Over: CEDAR CREEK

1.2M E SUPERIOR, Mineral, MT

Built 1966 Load: 41.7 t ADT: 3,776

NORTH ENTRANCE ROA

Fair

Over: GARDNER RIVER

3.0 MILES SOUTH OF NORTH, Park, MT

Built 1958 Load: 41.7 t ADT: 2,294

BURNS ST

Fair

Over: LITTLE BLACKFOOT R 019

N ELLISTON, Powell, MT

Built 1960 Load: 41.7 t ADT: 276

RIVERSIDE DR

Fair

Over: DRAINAGE 096

2M N TAMPICO, Valley, MT

Built 2000 Load: 41.7 t ADT: 100

ROAD

Fair

Over: FOSTER CR

MAIN ENTERANCE TO AJC, Deer Lodge, MT

Built 1966 Load: 41.8 t ADT: 40

IRR BIA RTE 25

Fair

Over: BADGER CREEK

8 KM NORTH OF HEART BUTTE, Glacier, MT

Built 2002 Load: 42.0 t ADT: 20

FOREST ROAD

Fair

Over: TRAIL CREEK

SPOTTED BEAR RIVER ROAD, Flathead, MT

Built 1962 Load: 42.1 t ADT: 30

ROAD 5156

Fair

Over: UPPER WILLOW CR

UPPER WILLOW CR, Granite, MT

Built 1968 Load: 42.1 t ADT: 40

NO DATA ENTERED

Fair

Over: LODGEPOLE CR

SPRUCE CR, Powell, MT

Built 1996 Load: 42.1 t ADT: 40

S 16

Fair

Over: DEER CREEK

3M N GLENDIVE, Dawson, MT

Built 1964 Load: 42.6 t ADT: 2,541

COUNTY ROAD 137

Fair

Over: S FK SANDSTONE CREEK 025

1M SW PLEVNA, Fallon, MT

Built 2011 Load: 42.6 t ADT: 100

WESTMORE RD

Fair

Over: SANDSTONE CREEK 024

11M NW PLEVNA, Fallon, MT

Built 2016 Load: 42.6 t ADT: 20

I 90

Fair

Over: MADISON RIVER OVERFLOW

2.5M E THREE FORKS, Gallatin, MT

Built 1963 Load: 42.6 t ADT: 9,524

I 90

Fair

Over: GALLATIN RIVER

3.1M E MANHATTAN, Gallatin, MT

Built 1965 Load: 42.6 t ADT: 9,601

I 90

Fair

Over: GALLATIN RIVER

3.1M E MANHATTAN, Gallatin, MT

Built 1965 Load: 42.6 t ADT: 9,601

I 15

Fair

Over: BOULDER RIVER

1.9M S BASIN, Jefferson, MT

Built 1985 Load: 42.6 t ADT: 3,141

CINNABAR BASIN RD

Fair

Over: MULHERIN CREEK 076

2M W CORWIN SPRINGS, Park, MT

Built 2005 Load: 42.6 t ADT: 100

RD 552

Fair

Over: POWDER RIVER 016

2M E POWDERVILLE, Powder River, MT

Built 2008 Load: 42.6 t ADT: 48

US 93

Fair

Over: BLODGETT CREEK

2M N HAMILTON, Ravalli, MT

Built 2008 Load: 42.6 t ADT: 14,663

RD 2345

Fair

Over: PL. VALLEY-FISHER RIVER

SO. PLEASANT VALLEY, Lincoln, MT

Built 1982 Load: 42.8 t ADT: 40

FOREST ROAD

Fair

Over: BUNKER CREEK

BUNKER CR, Flathead, MT

Built 1973 Load: 43.1 t ADT: 10

RD 9117

Fair

Over: TWELVEMILE CREEK

CABIN CITY CG, Mineral, MT

Built 1963 Load: 43.1 t ADT: 50

S MULLAN TRAIL RD

Fair

Over: CLARK FORK RIVER 030

9M E DRUMMOND, Powell, MT

Built 2003 Load: 43.4 t ADT: 100

I 15

Fair

Over: BEAVERHEAD RIVER

3.1M S DILLON, Beaverhead, MT

Built 1982 Load: 43.5 t ADT: 2,826

IRR - S 314

Fair

Over: SQUIRREL CREEK

DECKER, Big Horn, MT

Built 1981 Load: 43.5 t ADT: 837

POWDERVILLE RD

Fair

Over: PUMPKIN CREEK 002

31M S MILES CITY, Custer, MT

Built 1981 Load: 43.5 t ADT: 47

IRR - US 2

Fair

Over: CUT BANK CREEK

CUT BANK, Glacier, MT

Built 2007 Load: 43.5 t ADT: 3,401

FRONTAGE ROAD 295

Fair

Over: TEN MILE CREEK 071

2M N HELENA, Lewis and Clark, MT

Built 1962 Load: 43.5 t ADT: 1,755

I 90

Fair

Over: CLARK FORK RIVER

5M E ALBERTON, Missoula, MT

Built 1979 Load: 43.5 t ADT: 4,525

S 200

Fair

Over: BLACKFOOT RIVER

1M W BONNER, Missoula, MT

Built 2009 Load: 43.5 t ADT: 8,131

SLAB RD

Fair

Over: BIG MUDDY CREEK 038

10M NW CULBERTSON, Roosevelt, MT

Built 1950 Load: 43.5 t ADT: 100

20TH LN NE

Fair

Over: TETON RIVER 051

14M NE DUTTON, Teton, MT

Built 1930 Load: 43.5 t ADT: 100

INGOMAR RD

Fair

Over: MUGGINS CREEK 004

2M NW MYERS, Treasure, MT

Built 1970 Load: 43.5 t ADT: 100

Showing 3,101-3,150 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.