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

MONTFORT RD

Poor

Over: BUFFALO COULEE 108

1M S VANDALIA, Valley, MT

Built 1950 Load: 15.4 t ADT: 23

STATION ROAD

Poor

Over: BOULDER RIVER

BOX CANYON ADMIN SITE, Park, MT

Built 1947 Load: 15.6 t ADT: 1

FDR #8983

Poor

Over: N FK SUN RIVER

HANNAN GULCH, Lewis and Clark, MT

Built 1927 Load: 15.9 t ADT: 99

COUNTY ROAD 542

Poor

Over: THIRTEEN MILE CR 061

5M NW INTAKE, Dawson, MT

Built 1964 Load: 16.3 t ADT: 100

BENTONITE RD

Poor

Over: VANDALIA SOUTH CANAL 089

4M W GLASGOW, Valley, MT

Built 1938 Load: 16.3 t ADT: 100

524 MEADOW CR. RD.

Poor

Over: N F MEADOW CR

.1 MILE PAST JCT 5961, Lincoln, MT

Built 1953 Load: 16.5 t ADT: 25

FOREST ROAD

Poor

Over: HAND CREEK

SYLVIA LAKE ROAD, Flathead, MT

Built 2010 Load: 16.8 t ADT: 50

NO DATA ENTERED

Poor

Over: VERMILION RIVER

SEVEN POINT MTN, Sanders, MT

Built 1959 Load: 16.8 t ADT: 50

ROCKY BUTTE RD

Poor

Over: CROW CREEK 070

2M SW RONAN, Lake, MT

Built 1986 Load: 17.2 t ADT: 126

HARVEY RD

Poor

Over: MUSSELSHELL RIVER 018

3M SW MELSTONE, Musselshell, MT

Built 1916 Load: 18.1 t ADT: 100

W LAKE RD

Poor

Over: BIG MUDDY CREEK 046

3M W MEDICINE LAKE, Sheridan, MT

Built 1950 Load: 18.1 t ADT: 68

6TH LN NE

Poor

Over: DRAINAGE 129

13M SW DUTTON, Teton, MT

Built 1974 Load: 18.1 t ADT: 100

CARLYLE RD E

Poor

Over: BEAVER CREEK

6M W CARLYLE, Wibaux, MT

Built 1960 Load: 18.1 t ADT: 38

RD 343-2

Poor

Over: S FK FISH CREEK

FISH CR LOLO CR, Mineral, MT

Built 1966 Load: 18.5 t ADT: 50

FISH CR RD

Poor

Over: W FK FISH CREEK

FISH CR LOLO CR, Mineral, MT

Built 1966 Load: 18.5 t ADT: 50

FISH CR RD

Poor

Over: S FK FISH CREEK

FISH CR LOLO CR, Mineral, MT

Built 1965 Load: 18.8 t ADT: 50

S 529-CLEAR CR RD

Poor

Over: MILK RIVER

1M W CHINOOK, Blaine, MT

Built 1967 Load: 19.1 t ADT: 254

FDR 267

Poor

Over: JEFFERSON CREEK

0.1 MI EAST US89/267 JCT, Cascade, MT

Built 1957 Load: 19.1 t ADT: 50

NO DATA ENTERED

Poor

Over: BOULDER CR

BOULDER CREEK, Granite, MT

Built 1949 Load: 19.1 t ADT: 50

NFSR #487

Poor

Over: S FK JUDITH RIVER

18 MI SW OF UTICA, Judith Basin, MT

Built 1958 Load: 19.1 t ADT: 65

IRR - US 191

Poor

Over: WILD HORSE CREEK

20M SW MALTA, Phillips, MT

Built 1940 Load: 19.1 t ADT: 375

CRAIG FRONTAGE RD

Poor

Over: MISSOURI RIVER 054

2M NE WOLF CREEK, Lewis and Clark, MT

Built 1933 Load: 20.0 t ADT: 390

SHIELDS RIVER RD E

Poor

Over: SHIELDS RIVER OVERFL 022

8M NE LIVINGSTON, Park, MT

Built 1938 Load: 20.0 t ADT: 100

OLD US 10

Poor

Over: BIG DITCH 051

4M W LAUREL, Yellowstone, MT

Built 1932 Load: 20.0 t ADT: 2,474

NFSR 487

Poor

Over: S FK JUDITH RIVER

18.6 MI. SW FROM UTICA, Cascade, MT

Built 1958 Load: 20.1 t ADT: 65

NFSR #487

Poor

Over: S FK JUDITH RIVER

19 MI SW OF UTICA, Judith Basin, MT

Built 1958 Load: 20.1 t ADT: 65

NFSR #487

Poor

Over: S FK JUDITH RIVER

19 MI. SW OF UTICA, Judith Basin, MT

Built 1958 Load: 20.1 t ADT: 65

NFSR 495

Poor

Over: TELEGRAPH CREEK

TELEGRAPH-TELEGRAPH, Lewis and Clark, MT

Built 1950 Load: 20.1 t ADT: 30

STEVES FORK RD

Poor

Over: STEVES FORK CREEK 003

15M NW JORDAN, Garfield, MT

Built 1980 Load: 20.4 t ADT: 100

CPGD ACCESS

Poor

Over: TEN MILE CREEK

MOOSE CR CAMP GD., Lewis and Clark, MT

Built 1957 Load: 20.4 t ADT: 20

NO DATA ENTERED

Poor

Over: W FK MADISON RIVER

W FK MADISON RIVER, Madison, MT

Built 1947 Load: 20.4 t ADT: 50

S MAIN AVE

Poor

Over: MISSION CREEK 052

ST IGNATIUS-S MAIN ST, Lake, MT

Built 1929 Load: 20.5 t ADT: 2,220

TEMPLED HILLS RD.

Poor

Over: MILL CREEK

S. OF LIVINGSTON, Park, MT

Built 1952 Load: 20.7 t ADT: 50

BOINTER RD

Poor

Over: SWEET GRASS CREEK 044

9M SE BIG TIMBER, Sweet Grass, MT

Built 1970 Load: 20.8 t ADT: 100

OLD HWY 87

Poor

Over: TWO LEGGIN'S CANAL 0

1M W HARDIN, Big Horn, MT

Built 1931 Load: 20.9 t ADT: 561

FRONTAGE ROAD 205

Poor

Over: SNELL CREEK 073

17M SW MILES CITY, Custer, MT

Built 1928 Load: 20.9 t ADT: 100

S 200

Poor

Over: DRAINAGE

14M W BROCKWAY, McCone, MT

Built 1939 Load: 20.9 t ADT: 1,012

ROAD 317

Poor

Over: DRAG CREEK

SECT 11 T18N R29E, Petroleum, MT

Built 1963 Load: 20.9 t ADT: 2

STAGE RD

Poor

Over: SPRING COULEE 024

20M S DODSON, Phillips, MT

Built 1965 Load: 20.9 t ADT: 100

FDR 606

Poor

Over: BIRCH CR

BIRCH CR, Beaverhead, MT

Built 1954 Load: 21.1 t ADT: 40

NO DATA ENTERED

Poor

Over: N F LOSTHORSE CR

NO DATA ENTERED, Ravalli, MT

Built 1953 Load: 21.1 t ADT: 40

US 191

Poor

Over: FISH CREEK

14M S HARLOWTON, Wheatland, MT

Built 1942 Load: 21.4 t ADT: 657

NO DATA ENTERED

Poor

Over: WILLOW CR

WILLOW CR, Beaverhead, MT

Built 1954 Load: 21.7 t ADT: 20

NO DATA ENTERED

Poor

Over: ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 1954 Load: 21.7 t ADT: 50

BIG CREEK ROAD

Poor

Over: BIG CREEK

S. OF LIVINGSTON, Park, MT

Built 1961 Load: 21.7 t ADT: 50

RED ROCK RD

Poor

Over: LIMEKILN CANYON 022

7M NW DELL, Beaverhead, MT

Built 1931 Load: 21.8 t ADT: 119

EAGLE PASS TRAIL

Poor

Over: PABLO FEEDER CANAL 104

9M NE ST IGNATIUS, Lake, MT

Built 1977 Load: 21.8 t ADT: 100

S 223

Poor

Over: MARIAS RIVER

18M SE CHESTER, Liberty, MT

Built 1966 Load: 21.8 t ADT: 268

US 2

Poor

Over: BIG CHERRY CREEK

3M SW LIBBY, Lincoln, MT

Built 1976 Load: 21.8 t ADT: 5,592

OLD HWY 10 E

Poor

Over: ST REGIS RIVER 059

ST REGIS, Mineral, MT

Built 1937 Load: 21.8 t ADT: 119

Showing 4,851-4,900 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.