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

Forest Road

Good

Over: CLAYTON CREEK

West Side South Fork, Flathead, MT

Built 2007 ADT: 50

FOREST ROAD

Good

Over: HALLOWAT CREEK

HALLOWAT CREEK ROAD, Flathead, MT

Built 1986 ADT: 10

S 200

Good

Over: DRAINAGE-STOCKPASS

18M E JORDAN, Garfield, MT

Built 2023 ADT: 469

S 200

Good

Over: PADEN COULEE

19M E JORDAN, Garfield, MT

Built 2023 ADT: 469

MERIDIAN ROAD

Good

Over: JEFFERSON RIVER

5M SE THREE FORKS, Jefferson, MT

Built 2023 ADT: 100

US 93

Good

Over: WILDLIFE CROSSING

2 MILES NORTH OF RONAN, Lake, MT

Built 2007 ADT: 10,600

Foothill Road

Good

Over: Mission Res Inlet 043

6 M SE St ignatius, Lake, MT

Built 2023 ADT: 100

MOLLMAN PASS TRAIL

Good

Over: N KICKING HORSE RES 009

4M S RONAN, Lake, MT

Built 2023 ADT: 100

HILLSIDE ROAD

Good

Over: POST CREEK

7 M SOUTH RONAN, Lake, MT

Built 2023 ADT: 100

NO DATA ENTERED

Good

Over: BEAVER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2019 ADT: 50

NO DATA ENTERED

Good

Over: BEAVER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2018 ADT: 50

SWAMP CREEK ROAD

Good

Over: SWAMP CREEK

SWAMP CREEK, Lincoln, MT

Built 1995 ADT: 50

RTE 471

Good

Over: PIPE CREEK

NO DATA ENTERED, Lincoln, MT

Built 2020 ADT: 50

RD 336

Good

Over: EAST FORK PIPE CREEK

JCT RD 112 & RD 336, Lincoln, MT

Built 2020 ADT: 50

STUD HORSE CREEK R

Good

Over: LOWER HOLSTROM DITCH

OVER LOWER HOLSTROM DITCH, Meagher, MT

Built 2017 ADT: 50

LULU PASS ROAD

Good

Over: FISHER CREEK

4 M NE OF COOKE CITY, Park, MT

Built 2002 ADT: 100

Shields River Road

Good

Over: DEEP CREEK

NO DATA ENTERED, Park, MT

Built 2009 ADT: 50

Flatwillow Road

Good

Over: Flatwilow Creek

12M S Winnett, Petroleum, MT

Built 2023 ADT: 100

MESSENGER ROAD

Good

Over: NO NAME DITCH 074

WILLIAMS, Pondera, MT

Built 2023 ADT: 12

Powderville RD E

Good

Over: North Fork Horse Creek

16 Miles NE of Broadus, Powder River, MT

Built 2023 ADT: 48

LITTLE BLACKFOOT R

Good

Over: LITTLE BLACKFOOT RIVER

5M S ELLISTON, Powell, MT

Built 1981 ADT: 100

GREENHOUSE RD

Good

Over: DEMPSEY CREEK

5M S DEER LODGE, Powell, MT

Built 2000 ADT: 23

MT 141

Good

Over: THREEMILE CREEK

2 M N AVON, Powell, MT

Built 1961 ADT: 1,564

NO DATA ENTERED

Good

Over: JOHNSON CR

NO DATA ENTERED, Ravalli, MT

Built 2016 ADT: 50

RD 2051

Good

Over: EAST SHOTGUN CREEK 057

9 M N BAINVILLE, Roosevelt, MT

Built 2023 ADT: 100

IRR - S 251

Good

Over: Drainage

25 North East of Popular, Roosevelt, MT

Built 2023 ADT: 87

ACM RD

Good

Over: THOMPSON RIVER

ACM RD, Sanders, MT

Built 1996 ADT: 50

US 2

Good

Over: Unger Coulee

14 miles NW of Glasgow, Valley, MT

Built 2023 ADT: 100

S7-2ndAVE NE

Good

Over: Beaver Creek

NE Edge of Wibuax, Wibaux, MT

Built 2023 ADT: 1,060

SAINT PHILIP RD

Good

Over: BEAVER CREEK

11M S WIBAUX, Wibaux, MT

Built 2023 ADT: 36

I90

Good

Over: MT Power RR Spur

Billings, Yellowstone, MT

Built 2023 ADT: 14,315

I-90

Good

Over: Yellowstone River

Billings, Yellowstone, MT

Built 2023 ADT: 14,315

SAGE RD

Good

Over: E FORK BATTLE CREEK 053

18M N CHINOOK, Blaine, MT

Built 1999 Load: 4.5 t ADT: 100

10TH LN NW

Good

Over: FOSTER CREEK 026

11M N CHOTEAU, Teton, MT

Built 1984 Load: 4.5 t ADT: 100

4TH RD NE

Good

Over: NO NAME DITCH 011

12M NE FAIRFIELD, Teton, MT

Built 1938 Load: 5.4 t ADT: 100

NFSR 235

Good

Over: FAIRVIEW CR.

FAIRVIEW CR. NO. 1, Judith Basin, MT

Built 1977 Load: 10.0 t ADT: 40

1869: DEADWOOD GUL

Good

Over: BIG SHEEP CREEK

6 mi SW of I-15 exit 23, Beaverhead, MT

Built 1991 Load: 10.4 t ADT: 25

NO DATA ENTERED

Good

Over: ST REGIS RIVER

WARD CR, Mineral, MT

Built 1960 Load: 11.0 t ADT: 50

NO DATA ENTERED

Good

Over: ST REGIS RIVER

DEER CR, Mineral, MT

Built 1963 Load: 11.3 t ADT: 50

WALBERG RANCH LN

Good

Over: ROCK CREEK 054

25M W PHILLIPSBURG, Granite, MT

Built 1987 Load: 11.7 t ADT: 592

WISE RIVER RD

Good

Over: MILLER CREEK 116

MISSOULA, Missoula, MT

Built 2002 Load: 11.8 t ADT: 100

27TH AVE W

Good

Over: BIG DITCH 031

3M W LAUREL, Yellowstone, MT

Built 1988 Load: 11.8 t ADT: 590

IRR - I 90

Good

Over: BIGHORN RIVER

HARDIN, Big Horn, MT

Built 1971 Load: 12.6 t ADT: 4,249

ROAD

Good

Over: CREEK

NO DATA ENTERED, Park, MT

Built 2000 Load: 12.6 t ADT: 50

FOREST GROVE RD

Good

Over: S FORK MCDONALD CREEK

5M SW GRASSRANGE, Fergus, MT

Built 2021 Load: 12.7 t ADT: 146

LOST HORSE CR RD

Good

Over: DEADMAN CREEK 098

7M SW CANYON CREEK, Lewis and Clark, MT

Built 1990 Load: 12.7 t ADT: 100

JOHN G MINE RD

Good

Over: HELENA VALLEY CANAL 116

6M NW HELENA, Lewis and Clark, MT

Built 1958 Load: 12.7 t ADT: 790

VALIER DUPUYER RD

Good

Over: VALIER CANAL 035

5M NE DUPUYER, Pondera, MT

Built 1950 Load: 12.7 t ADT: 119

NFSR

Good

Over: LOST JOHNNY CREEK

SOUTH FORK FLATHEAD, Flathead, MT

Built 2009 Load: 13.3 t ADT: 40

LOWER VALLEY RD

Good

Over: ASHLEY CREEK 001

5M SE KALISPELL, Flathead, MT

Built 1995 Load: 13.3 t ADT: 100

Showing 3,351-3,400 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.