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

BIA 35

Good

Over: SAGE CREEK

3.2 MILES N, OF BOX ELDER, Hill, MT

Built 2010 Load: 38.7 t ADT: 25

SAWMILL CREEK ROAD

Good

Over: SAWMILL CREEK

LINCOLN RANGER DISTRICT, Lewis and Clark, MT

Built 2013 Load: 38.9 t ADT: 40

746 VINAL LAKE RD.

Good

Over: VINAL CREEK

VINAL CREEK, Lincoln, MT

Built 1980 Load: 38.9 t ADT: 50

PRICE RD S

Good

Over: S PONDERA COULEE 006

7M NE BRADY, Pondera, MT

Built 1973 Load: 38.9 t ADT: 100

S 569

Good

Over: FRENCH GULCH 042

19M SW ANACONDA, Deer Lodge, MT

Built 2015 Load: 39.0 t ADT: 288

S 19

Good

Over: FORDS CREEK

7M N GRASS RANGE, Fergus, MT

Built 1962 Load: 39.0 t ADT: 586

MONFORTON SCH RD

Good

Over: HYALITE CREEK 093

4M W BOZEMAN, Gallatin, MT

Built 2014 Load: 39.0 t ADT: 100

S 300

Good

Over: FISH CREEK

1M S RYEGATE, Golden Valley, MT

Built 2014 Load: 39.0 t ADT: 171

I 15

Good

Over: RR

2M N CRAIG, Lewis and Clark, MT

Built 1967 Load: 39.0 t ADT: 2,224

US 287

Good

Over: ELK CREEK

AUGUSTA, Lewis and Clark, MT

Built 2008 Load: 39.0 t ADT: 436

US 287

Good

Over: ELK CREEK OVERFLOW

AUGUSTA, Lewis and Clark, MT

Built 2008 Load: 39.0 t ADT: 436

COUNTY RD 001

Good

Over: COTTONWOOD CREEK

16M S JOPLIN, Liberty, MT

Built 2020 Load: 39.0 t ADT: 100

BOTHMAN DR

Good

Over: PIPE CREEK 121

4M NW LIBBY, Lincoln, MT

Built 2010 Load: 39.0 t ADT: 100

US 2

Good

Over: SWAMP CREEK

24M NW HAPPY`S INN, Lincoln, MT

Built 2013 Load: 39.0 t ADT: 1,597

N RUSSEL STREET

Good

Over: CLARK FORK RIVER

MISSOULA-RUSSELL STREET., Missoula, MT

Built 2020 Load: 39.0 t ADT: 17,245

E MULLAN RD

Good

Over: MILL CREEK

.18M SE FRENCHTOWN, Missoula, MT

Built 2020 Load: 39.0 t ADT: 100

DERBY DR

Good

Over: NO NAME COULEE 027

2M SW CONRAD, Pondera, MT

Built 2005 Load: 39.0 t ADT: 100

S 340

Good

Over: PLUM COULEE CREEK

1M SE FALLON, Prairie, MT

Built 2020 Load: 39.0 t ADT: 211

US 93 FH 19

Good

Over: E FORK BITTERROOT RIVER

7M SE CONNER, Ravalli, MT

Built 2003 Load: 39.0 t ADT: 1,069

US 93

Good

Over: MILL CREEK

4M S VICTOR, Ravalli, MT

Built 2011 Load: 39.0 t ADT: 15,526

NEW ALIGNMENT BUIL

Good

Over: DRAINAGE

3M EAST BAINVILLE, Roosevelt, MT

Built 2020 Load: 39.0 t ADT: 280

S 200

Good

Over: THOMPSON RIVER

5M SE THOMPSON FALLS, Sanders, MT

Built 2015 Load: 39.0 t ADT: 2,136

SWAMP CREEK RD

Good

Over: SWAMP CREEK

5.9M N BIG TIMBER, Sweet Grass, MT

Built 2020 Load: 39.0 t ADT: 100

LOST TRAIL ROAD

Good

Over: CANYON CREEK

10.2 MILES NW LAUREL, Yellowstone, MT

Built 2020 Load: 39.0 t ADT: 100

FRONTAGE ROAD 683

Good

Over: BBWA CANAL 032

2M E LAUREL, Yellowstone, MT

Built 1965 Load: 39.0 t ADT: 3,060

IRR BIA RTE 37

Good

Over: LITTLE PEOPLE'S CREEK

AT ST PAUL'S MISSION, Blaine, MT

Built 2006 Load: 39.1 t ADT: 220

NO DATA ENTERED

Good

Over: BLACKFOOT RIVER

NO DATA ENTERED, Powell, MT

Built 2011 Load: 39.2 t ADT: 31

NO DATA ENTERED

Good

Over: N.F. LITTLE THOMPSON

NO DATA ENTERED, Sanders, MT

Built 2005 Load: 39.2 t ADT: 40

691 CAMP CR. ROAD

Good

Over: MADGE CREEK

NO DATA ENTERED, Lincoln, MT

Built 2011 Load: 39.5 t ADT: 50

RD 112

Good

Over: E F PIPE CREEK

DARK PURCELL, Lincoln, MT

Built 2019 Load: 39.5 t ADT: 50

NO DATA ENTERED

Good

Over: CHIPMUNK CREEK

NO DATA ENTERED, Sanders, MT

Built 2002 Load: 39.5 t ADT: 40

US 2

Good

Over: CLEAR CREEK

8M W CHINOOK, Blaine, MT

Built 2020 Load: 39.9 t ADT: 2,783

MONTAQUA RD

Good

Over: ROCK CREEK 047

MONTAQUA, Carbon, MT

Built 2014 Load: 39.9 t ADT: 100

TRAIL CREEK RD

Good

Over: STREVELL CREEK 042

25M SE MILES CITY, Custer, MT

Built 2018 Load: 39.9 t ADT: 56

S 596

Good

Over: BIG CALIFORNIA CREEK

15M S ANACONDA, Deer Lodge, MT

Built 2019 Load: 39.9 t ADT: 288

IRR - US 2

Good

Over: S FORK FLATHEAD RIVER

HUNGRY HORSE, Flathead, MT

Built 2018 Load: 39.9 t ADT: 8,319

STORM CASTLE ROAD

Good

Over: FRENCH CREEK

STORM CASTLE CREEK, Gallatin, MT

Built 2014 Load: 39.9 t ADT: 40

US 93

Good

Over: WILDLIFE UNDERPASS

S OF RAVALLI, Lake, MT

Built 2006 Load: 39.9 t ADT: 8,330

US 287

Good

Over: DRY CREEK

5M SE AUGUSTA, Lewis and Clark, MT

Built 2008 Load: 39.9 t ADT: 375

US 87

Good

Over: PARK COULEE

16M S KLEIN, Musselshell, MT

Built 1995 Load: 39.9 t ADT: 2,497

S 540-E RIVER RD

Good

Over: SIX MILE CREEK

6M SW PRAY, Park, MT

Built 2006 Load: 39.9 t ADT: 257

US 89

Good

Over: S FK DRY FK MARIAS RIVER

5M SE DUPUYER, Pondera, MT

Built 2013 Load: 39.9 t ADT: 485

BECK HILL RD

Good

Over: LITTLE BLACKFOOT R 023

3M E GARRISON, Powell, MT

Built 2011 Load: 39.9 t ADT: 48

S 200

Good

Over: ARRASTRA CREEK

12M SE OVANDO, Powell, MT

Built 2008 Load: 39.9 t ADT: 1,823

US 2

Good

Over: RED BANK CREEK

4M E BAINVILLE, Roosevelt, MT

Built 2010 Load: 39.9 t ADT: 1,440

US 287

Good

Over: USRS CANAL

8M NE AUGUSTA, Teton, MT

Built 2005 Load: 39.9 t ADT: 587

US 191

Good

Over: RR

JUDITH GAP, Wheatland, MT

Built 2009 Load: 39.9 t ADT: 2,199

IRR BIA RTE 8

Good

Over: OSWEGO SOUTH MAIN CANAL

3.2 KM EAST OF OSWEGO, Valley, MT

Built 1983 Load: 40.0 t ADT: 100

FORD WC ACCESS

Good

Over: TEPEE CREEK

FORD WORK CENTER, Flathead, MT

Built 2010 Load: 40.2 t ADT: 40

NFSR 8841

Good

Over: N.F. HIGHWODD CREEK

0.6 MI.SE RD.8841/121 JCT, Chouteau, MT

Built 2014 Load: 40.5 t ADT: 40

Showing 4,501-4,550 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.