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-US 89

Good

Over: BELT CREEK

2M S BELT, Cascade, MT

Built 2022 Load: 35.4 t ADT: 2,931

BRANCH I 15-U.S. 8

Good

Over: RR

GREAT FALLS, Cascade, MT

Built 1967 Load: 35.4 t ADT: 6,196

US 89

Good

Over: MUDDY CREEK

VAUGHN, Cascade, MT

Built 2002 Load: 35.4 t ADT: 5,533

IRR - US 2

Good

Over: RR

1M SW BROWNING, Glacier, MT

Built 1997 Load: 35.4 t ADT: 2,291

IRR - S 213

Good

Over: ROCKY COULEE

5M NW SANTA RITA, Glacier, MT

Built 2011 Load: 35.4 t ADT: 159

HOT SPRINGS ROAD

Good

Over: BIG PIPESTONE CREEK

6M W WHITEHALL, Jefferson, MT

Built 2020 Load: 35.4 t ADT: 100

SPENCER RD

Good

Over: ARROW CREEK 025

6M NE GEYSER, Judith Basin, MT

Built 2013 Load: 35.4 t ADT: 100

US 87

Good

Over: SAGE CREEK

WINDHAM, Judith Basin, MT

Built 1993 Load: 35.4 t ADT: 2,573

US 87

Good

Over: RR

2M SE MOCCASIN, Judith Basin, MT

Built 2012 Load: 35.4 t ADT: 2,459

US 93

Good

Over: SABINE CREEK-WILDLIFE

1M S ST IGNATIUS, Lake, MT

Built 2006 Load: 35.4 t ADT: 6,822

STOKEN ROAD

Good

Over: GRAVE CREEK 125

6M N FORTINE, Lincoln, MT

Built 2009 Load: 35.4 t ADT: 100

I 90

Good

Over: ST. REGIS RIVER

3.1M W ST. REGIS, Mineral, MT

Built 1981 Load: 35.4 t ADT: 3,180

DONEY ROAD

Good

Over: FINLEY CREEK 013

5M S ARLEE, Missoula, MT

Built 2009 Load: 35.4 t ADT: 109

FARREL ST

Good

Over: HALF BREED CREEK

KLEIN, Musselshell, MT

Built 2021 Load: 35.4 t ADT: 100

US 12

Good

Over: HORSETHIEF CREEK

3M SW ROUNDUP, Musselshell, MT

Built 2015 Load: 35.4 t ADT: 665

CONVICT GRADE RD

Good

Over: SHEILDS RIVER

6M NE OF LIVINGSTON, Park, MT

Built 2019 Load: 35.4 t ADT: 100

S 44

Good

Over: SOBERUP CREEK

8M W VALIER, Pondera, MT

Built 2003 Load: 35.4 t ADT: 831

S 44

Good

Over: IRRIGATION CANAL

2M W VALIER, Pondera, MT

Built 2003 Load: 35.4 t ADT: 1,090

S 59

Good

Over: MIZPAH CREEK

9M NW BROADUS, Powder River, MT

Built 2001 Load: 35.4 t ADT: 849

SECOND STREET

Good

Over: COTTONWOOD CREEK

DEER LODGE - SECOND STREE, Powell, MT

Built 2012 Load: 35.4 t ADT: 100

S FRONTAGE RD 011

Good

Over: ABANDONED RR 043

8M S DEER LODGE, Powell, MT

Built 2014 Load: 35.4 t ADT: 899

WHITNEY CREEK RD

Good

Over: O`FALLON CREEK 017

SW MILDRED, Prairie, MT

Built 2003 Load: 35.4 t ADT: 32

US 93

Good

Over: SWEENEY CREEK

6M N STEVENSVILLE, Ravalli, MT

Built 2005 Load: 35.4 t ADT: 11,836

S 16

Good

Over: DAY CREEK

4M SE CULBERTSON, Richland, MT

Built 2009 Load: 35.4 t ADT: 963

IRR BIA RTE 6

Good

Over: LAME DEER CREEK

AT LAME DEER, Rosebud, MT

Built 1976 Load: 35.4 t ADT: 3,000

S 200

Good

Over: RR

2M SE THOMPSON FALLS, Sanders, MT

Built 2000 Load: 35.4 t ADT: 2,247

MIDBY RD

Good

Over: BIG MUDDY CREEK 024

7M W PLENTYWOOD, Sheridan, MT

Built 1987 Load: 35.4 t ADT: 22

ROSEBUD CEMETERY R

Good

Over: BUTCHER CREEK 030

3M S ABSAROKEE, Stillwater, MT

Built 2013 Load: 35.4 t ADT: 100

S 78

Good

Over: JOE HILL CREEK

4M SW COLUMBUS, Stillwater, MT

Built 2007 Load: 35.4 t ADT: 2,305

SWAMP CREEK RD

Good

Over: BIG TIMBER CREEK

4M N BIG TIMBER, Sweet Grass, MT

Built 2019 Load: 35.4 t ADT: 100

ALKALI CREEK ROAD

Good

Over: ALKALI CREEK

1M N BILLINGS, Yellowstone, MT

Built 2021 Load: 35.4 t ADT: 989

KOOCANUSA W. SIDE

Good

Over: BIG CREEK

BIG CREEK, Lincoln, MT

Built 1970 Load: 35.6 t ADT: 40

SHIELDS RIVER RD

Good

Over: SHIELDS RIVER

NORTH CRAZIES, Meagher, MT

Built 2016 Load: 35.6 t ADT: 50

SODA CR TR-REPUBLI

Good

Over: WOODY CREEK

COOKE CITY, Park, MT

Built 2022 Load: 35.6 t ADT: 100

IRRS 234

Good

Over: BEAVER CREEK

11M S HAVRE, Hill, MT

Built 2002 Load: 35.7 t ADT: 563

IRRS 234

Good

Over: BEAVER CREEK

18M S HAVRE, Hill, MT

Built 2003 Load: 35.7 t ADT: 563

FDR 2469

Good

Over: NO DATA ENTERED

SEYMOUR CR., Deer Lodge, MT

Built 1994 Load: 36.0 t ADT: 20

1127: DRY FORK

Good

Over: DRY FORK CREEK

19 mi SE of US 191, Phillips, MT

Built 1979 Load: 36.0 t ADT: 25

IRR BIA RTE 110

Good

Over: NORTH FORK WHITETAIL CRK

4 KM WEST OF HEART BUTTE, Pondera, MT

Built 1979 Load: 36.0 t ADT: 30

W FK THOMPSON RD

Good

Over: HONEYMOON CR

THOMPSON-FISHTRAP, Sanders, MT

Built 2007 Load: 36.0 t ADT: 40

S DIVISION LN

Good

Over: GREENFIELD CANAL 058

1M S FAIRFIELD, Teton, MT

Built 1978 Load: 36.0 t ADT: 100

SKINNER MEADOWS RD

Good

Over: GOVERNOR CREEK 130

3M SW JACKSON, Beaverhead, MT

Built 2010 Load: 36.3 t ADT: 100

NISSEN LANE

Good

Over: DILLON CANAL 129

3M NE DILLON, Beaverhead, MT

Built 2010 Load: 36.3 t ADT: 100

CARRIGAN LANE

Good

Over: CANYON DITCH 127

8M S DILLON, Beaverhead, MT

Built 2011 Load: 36.3 t ADT: 100

MANCHESTER RD S

Good

Over: SUN RIVER 055

MANCHESTER, Cascade, MT

Built 2001 Load: 36.3 t ADT: 203

TRAIL CREEK RD

Good

Over: MASON CREEK 059

49M E MILES CITY, Custer, MT

Built 2016 Load: 36.3 t ADT: 100

GAS CITY RD

Good

Over: CLARK FORK RIVER 019

1M E WARM SPRINGS, Deer Lodge, MT

Built 2011 Load: 36.3 t ADT: 100

CRACKERVILLE RD

Good

Over: SILVERBOW CREEK 002

4M S OPPORTUNITY, Deer Lodge, MT

Built 2014 Load: 36.3 t ADT: 515

WOLF CREEK DR

Good

Over: WOLF CREEK 009

5M NE BIG FORK, Flathead, MT

Built 2001 Load: 36.3 t ADT: 100

US 2

Good

Over: ASHLEY CREEK

6M SW KALISPELL, Flathead, MT

Built 2014 Load: 36.3 t ADT: 7,046

Showing 4,351-4,400 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.