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 87-ROUNDUP RD

Good

Over: BBWA CANAL

3M N BILLINGS, Yellowstone, MT

Built 1977 Load: 30.8 t ADT: 5,986

S 522 (36-31)

Good

Over: PRYOR CREEK

1M S HUNTLEY, Yellowstone, MT

Built 2011 Load: 30.8 t ADT: 4,306

HWY 463

Good

Over: ROTTEN GRASS CREEK 008

15M SW LODGE GRASS, Big Horn, MT

Built 1966 Load: 31.1 t ADT: 72

CARROLL TRAIL

Good

Over: BEAVER CREEK 138

5M S GLENGARRY, Fergus, MT

Built 2013 Load: 31.1 t ADT: 31

NFSR 233

Good

Over: BEAVER CREEK

BEAVER CREEK NO. 6, Lewis and Clark, MT

Built 1978 Load: 31.1 t ADT: 26

RD 889

Good

Over: WARD CR

WARD CR, Mineral, MT

Built 1968 Load: 31.1 t ADT: 50

FOREST ROAD

Good

Over: NORTH FORK COLD CREEK

NORTH FORK COLD CREEK, Missoula, MT

Built 2012 Load: 31.1 t ADT: 40

RD 7618

Good

Over: WILKES CREEK

WILKES CREEK, Sanders, MT

Built 1973 Load: 31.1 t ADT: 50

LOWER SWEET GRASS

Good

Over: E FK SWEET GRASS CR 01

14M NE BIG TIMBER, Sweet Grass, MT

Built 2012 Load: 31.1 t ADT: 15

SANDROCK RD

Good

Over: WARM SPRINGS CREEK 077

4M NE DANVERS, Fergus, MT

Built 2010 Load: 31.4 t ADT: 100

TIMBERLINE RD

Good

Over: BIG SPRING CREEK 134

4M SE LEWISTOWN, Fergus, MT

Built 2012 Load: 31.4 t ADT: 100

FOREST ROAD

Good

Over: CANYON CREEK

RD 38 @ CANYON CR, Flathead, MT

Built 2010 Load: 31.4 t ADT: 40

S 200

Good

Over: LITTLE DRY CREEK

26 M E JORDAN, Garfield, MT

Built 2022 Load: 31.4 t ADT: 544

MORRELL CREEK RD

Good

Over: MORRELL CREEK

MORRELL CR, Powell, MT

Built 2015 Load: 31.4 t ADT: 50

NFSR 144

Good

Over: NORTH FORK TETON RIVER

W FK STATION, Teton, MT

Built 1977 Load: 31.4 t ADT: 65

BOBTAIL CUTOFF RD

Good

Over: PIPE CREEK 027

6M NW LIBBY, Lincoln, MT

Built 1950 Load: 31.5 t ADT: 186

HORSE RANCH RD

Good

Over: BOX ELDER CREEK 120

NW FERGUS, Fergus, MT

Built 1962 Load: 31.7 t ADT: 100

E RIVER ST

Good

Over: CLARKS FK YELLOWSTNE 053

N EDGE FROMBERG, Carbon, MT

Built 2008 Load: 31.8 t ADT: 1,098

COTTONWOOD CR RD

Good

Over: BOX ELDER CREEK 022

18M NE HAMMOND, Carter, MT

Built 2010 Load: 31.8 t ADT: 100

WILLOW CREEK RD

Good

Over: LITTLE BELT CREEK 100

12M E BELT, Cascade, MT

Built 1950 Load: 31.8 t ADT: 157

UPPER HIGHWOOD CR

Good

Over: HIGHWOOD CREEK 039

4M SE HIGHWOOD, Chouteau, MT

Built 2020 Load: 31.8 t ADT: 100

UPPER HIGHWOOD CR

Good

Over: HIGHWOOD CREEK 068

7M SE HIGHWOOD, Chouteau, MT

Built 2015 Load: 31.8 t ADT: 100

COUNTY ROAD 178

Good

Over: LITTLE BEAVER CREEK 055

12M NE WEBSTER, Fallon, MT

Built 2013 Load: 31.8 t ADT: 100

WEBSTER RD

Good

Over: LITTLE BEAVER CREEK

18M NE EKALAKA, Fallon, MT

Built 1978 Load: 31.8 t ADT: 26

US 191

Good

Over: DAWKINS BRANCH

3M SW MOORE, Fergus, MT

Built 2021 Load: 31.8 t ADT: 2,094

FOREST ROAD

Good

Over: GRIFFIN CREEK

GRIFFIN CREEK ROAD, Flathead, MT

Built 2001 Load: 31.8 t ADT: 50

NORTH FORK RD

Good

Over: MOOSE CREEK 038

7M NW POLEBRIDGE, Flathead, MT

Built 1976 Load: 31.8 t ADT: 59

US 93 BYPASS

Good

Over: ASHLEY CREEK

SW KALISPELL, Flathead, MT

Built 2010 Load: 31.8 t ADT: 19,555

BEATTY RD

Good

Over: SOUTH DRY CREEK

2M SE FOUR CORNERS, Gallatin, MT

Built 2022 Load: 31.8 t ADT: 100

US 191 FH 42

Good

Over: TAYLOR FORK GALLATIN R

16M SE BIG SKY, Gallatin, MT

Built 1959 Load: 31.8 t ADT: 2,214

MERIWETHER RD

Good

Over: WILLOW CREEK

11M NE BLACKFOOT, Glacier, MT

Built 2002 Load: 31.8 t ADT: 156

S 512

Good

Over: FLINT CREEK

1M E HALL, Granite, MT

Built 1964 Load: 31.8 t ADT: 218

US 2

Good

Over: LITTLE BOX ELDER CREEK

6M E HAVRE, Hill, MT

Built 2011 Load: 31.8 t ADT: 3,602

US 2

Good

Over: DRAINAGE

7M E HAVRE, Hill, MT

Built 2011 Load: 31.8 t ADT: 3,602

S PEAK RD

Good

Over: ARROW CREEK 038

6M NW GEYSER, Judith Basin, MT

Built 2009 Load: 31.8 t ADT: 100

STEMPLE PASS ROAD

Good

Over: POORMAN CREEK

6M S LINCOLN, Lewis and Clark, MT

Built 2021 Load: 31.8 t ADT: 95

CANYON FERRY RD

Good

Over: PRICKLY PEAR CREEK

1M E HELENA, Lewis and Clark, MT

Built 2001 Load: 31.8 t ADT: 10,679

US 2

Good

Over: FISHER RIVER

2M W HAPPY`S INN, Lincoln, MT

Built 1997 Load: 31.8 t ADT: 1,363

S 84

Good

Over: MADISON RIVER

7M NE NORRIS, Madison, MT

Built 1992 Load: 31.8 t ADT: 2,192

LITTLE JOE CR RD

Good

Over: ST REGIS RIVER 027

1M W ST REGIS, Mineral, MT

Built 1965 Load: 31.8 t ADT: 57

I 90

Good

Over: BLACK FOOT RIVER

0.6 M WEST BONNER, Missoula, MT

Built 2019 Load: 31.8 t ADT: 6,035

FOREST ROAD

Good

Over: CONDON CREEK

CONDON LOOP ROAD, Missoula, MT

Built 2010 Load: 31.8 t ADT: 40

SUNSET HILL RD

Good

Over: ELK CREEK 089

6M S CLEARWATER JCT, Missoula, MT

Built 1992 Load: 31.8 t ADT: 100

US 93

Good

Over: LOLO CREEK

LOLO, Missoula, MT

Built 1965 Load: 31.8 t ADT: 20,527

US 12

Good

Over: STOCKPASS-DRAINAGE

3M NE MUSSELSHELL, Musselshell, MT

Built 2003 Load: 31.8 t ADT: 358

MIDWAY RD E

Good

Over: PONDERA COULEE 004

23M NE BRADY, Pondera, MT

Built 1987 Load: 31.8 t ADT: 59

MIDWAY RD W

Good

Over: NO NAME COULEE 028

3M SW CONRAD, Pondera, MT

Built 2012 Load: 31.8 t ADT: 96

US 89

Good

Over: DUPUYER CREEK

DUPUYER, Pondera, MT

Built 1980 Load: 31.8 t ADT: 508

S 327

Good

Over: DRAINAGE

14M SE BAINVILLE, Roosevelt, MT

Built 1999 Load: 31.8 t ADT: 273

PETROLEUM RD

Good

Over: BIG PORCUPINE CR

14M E INGOMAR, Rosebud, MT

Built 2022 Load: 31.8 t ADT: 100

Showing 4,001-4,050 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.