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

STRATER RD

Poor

Over: DODSON SOUTH CANAL 116

6M E MALTA, Phillips, MT

Built 1938 Load: 4.5 t ADT: 33

CB ROUTE RD

Poor

Over: BUFFALO RAPIDS CANAL042

5M NE FALLON, Prairie, MT

Built 1939 Load: 4.5 t ADT: 80

WENDEL KINCHELOE R

Poor

Over: RATTLESNAKE CREEK 002

20M NW SUMATRA, Rosebud, MT

Built 1950 Load: 4.5 t ADT: 100

UPPER DEER CR RD

Poor

Over: UPPER DEER CREEK 028

6M SE BIG TIMBER, Sweet Grass, MT

Built 1975 Load: 4.5 t ADT: 100

ROCK CR DAM RD

Poor

Over: ROCK CREEK 098

6M N HINSDALE, Valley, MT

Built 1955 Load: 4.5 t ADT: 100

COUNTY ROAD 226

Poor

Over: COAL CREEK 038

13M N RICHLAND, Daniels, MT

Built 1971 Load: 5.4 t ADT: 100

BIRCH RD

Poor

Over: ROSS FORK CREEK 018

2M NW SIPPLE, Judith Basin, MT

Built 1925 Load: 5.4 t ADT: 15

SILVER SPRING RD

Poor

Over: RUBY RIVER 023

3M S SHERIDAN, Madison, MT

Built 1927 Load: 5.4 t ADT: 131

OLD CAT CREEK RD

Poor

Over: BOX ELDER CREEK 008

5M NE WINNETT, Petroleum, MT

Built 1930 Load: 5.4 t ADT: 100

FRONTAGE RD

Poor

Over: SARPY CREEK 003

4M E HYSHAM, Treasure, MT

Built 1925 Load: 5.4 t ADT: 28

RIVER RD

Poor

Over: IRRIGATION DITCH 005

3M W HYSHAM, Treasure, MT

Built 1979 Load: 5.4 t ADT: 17

BROWNS BRIDGE RD

Poor

Over: BIG HOLE RIVER 123

6.2M S MELROSE, Beaverhead, MT

Built 1915 Load: 6.4 t ADT: 100

COUNTY RD 244

Poor

Over: BEAVER CREEK 132

28M SE MALTA, Phillips, MT

Built 1915 Load: 6.4 t ADT: 100

IRR BIA RTE 13

Poor

Over: SOUTH FORK MILK RIVER

31KM NORTH BLACKFEET SCHL, Glacier, MT

Built 1979 Load: 6.5 t ADT: 60

TRULY CUTOFF RD

Poor

Over: SMITH RIVER 033

7M SE ULM, Cascade, MT

Built 1908 Load: 6.8 t ADT: 100

MAIDEN ROCK RD

Poor

Over: BRIDGER CREEK 106

3M E BOZEMAN, Gallatin, MT

Built 1940 Load: 7.3 t ADT: 100

WILLOW RD

Poor

Over: LITTLE BLACKFOOT R 042

E ELLISTON, Powell, MT

Built 1991 Load: 7.3 t ADT: 100

MICHEL CREEK RD

Poor

Over: CAMAS CREEK 002

6M N PERMA, Sanders, MT

Built 1978 Load: 7.3 t ADT: 100

LOVERS LANE

Poor

Over: ELK CREEK 041

S AUGUSTA, Lewis and Clark, MT

Built 1914 Load: 7.8 t ADT: 100

REDROCK RD

Poor

Over: FORT BELKNAP CANAL 008

3M NW CHINOOK, Blaine, MT

Built 1933 Load: 8.2 t ADT: 211

ALKALI RD

Poor

Over: ALKALI CREEK 001

7M SW MALTA, Phillips, MT

Built 1920 Load: 8.2 t ADT: 100

FDR #9202

Poor

Over: MOOSE CREEK

MOOSE CREEK CAMPGROUND D7, Meagher, MT

Built 1959 Load: 8.4 t ADT: 50

POTTER CREEK RD

Poor

Over: POTTER CREEK 005

1M N WILSALL, Park, MT

Built 1915 Load: 9.1 t ADT: 100

CHOKECHERRY LN

Poor

Over: LITTLE BLACKFOOT R 027

4M SW AVON, Powell, MT

Built 1914 Load: 9.1 t ADT: 19

1ST AVE

Poor

Over: SIXTEENMILE CREEK 029

RINGLING, Meagher, MT

Built 1976 Load: 9.3 t ADT: 100

HUGHES LN

Poor

Over: FLATWILLOW CREEK 016

16M S WINNETT, Petroleum, MT

Built 1950 Load: 10.0 t ADT: 100

PUGSLEY RD

Poor

Over: MARIAS RIVER 006

18M SW CHESTER, Liberty, MT

Built 1951 Load: 10.9 t ADT: 100

YOUTH RANCH RD

Poor

Over: WHITEWATER CREEK 110

8M S WHITEWATER, Phillips, MT

Built 1977 Load: 10.9 t ADT: 100

REGINA RD

Poor

Over: BEAVER CREEK 049

23M S MALTA, Phillips, MT

Built 1983 Load: 10.9 t ADT: 42

HOG RANCH RD

Poor

Over: BIG WARM CREEK 026

24M S DODSON, Phillips, MT

Built 1960 Load: 10.9 t ADT: 100

SOAP CREEK RD

Poor

Over: BIG HORN CANAL 009

11M SW ST XAVIER, Big Horn, MT

Built 1946 Load: 11.5 t ADT: 63

ROAD 238

Poor

Over: CLEAR CREEK 027

19M W GLENDIVE, Dawson, MT

Built 1979 Load: 11.8 t ADT: 50

BEAUTY CREEK RD

Poor

Over: DIRTY CREEK 047

3M W BROCKWAY, McCone, MT

Built 1938 Load: 11.8 t ADT: 100

COUNTY ROAD 098

Poor

Over: CLARK FORK RIVER 020

2M N WARM SPRINGS, Deer Lodge, MT

Built 1920 Load: 12.7 t ADT: 100

LIL BITTERROOT RD

Poor

Over: LITTLE BITTERROOT R 061

7M NE HOT SPRINGS, Lake, MT

Built 1965 Load: 12.7 t ADT: 100

CANYON RD

Poor

Over: SMITH RIVER 002

8M NW WHITE SULPHUR SPR, Meagher, MT

Built 1957 Load: 12.7 t ADT: 100

ELK CREEK RD

Poor

Over: SHIELDS RIVER 018

3M NE WILSALL, Park, MT

Built 1960 Load: 12.7 t ADT: 100

NO DATA ENTERED

Poor

Over: SUNDAY CREEK

NO DATA ENTERED, Lincoln, MT

Built 1998 Load: 13.0 t ADT: 25

IRR BIA RTE 205

Poor

Over: UPPER LODGE GRASS CREEK

6.8 KM NW JCT 205 & 418, Big Horn, MT

Built 1994 Load: 13.1 t ADT: 12

MIDDLE RD

Poor

Over: BATTLE CREEK 056

4M N CHINOOK, Blaine, MT

Built 1920 Load: 13.2 t ADT: 100

NORTH AVE W

Poor

Over: BITTERROOT RIVER 010

W MISSOULA, Missoula, MT

Built 1935 Load: 13.6 t ADT: 3,605

MERIDIAN RD

Poor

Over: BEAR CREEK 015

2M S VICTOR, Ravalli, MT

Built 1936 Load: 13.6 t ADT: 100

HENTGES RD

Poor

Over: LITTLE PORCUPINE CR 064

FRAZER-HENTGES RD, Valley, MT

Built 1965 Load: 13.6 t ADT: 100

STAGECOACH TRL RD

Poor

Over: BAKER CREEK 082

2M NW BELGRADE, Gallatin, MT

Built 1959 Load: 14.5 t ADT: 100

SHIELDS RIVER RD E

Poor

Over: SHIELDS RIVER 023

8M NE LIVINGSTON, Park, MT

Built 1923 Load: 14.5 t ADT: 100

LOWER HARB RD

Poor

Over: BEAVER CREEK 092

14M E MALTA, Phillips, MT

Built 1968 Load: 14.5 t ADT: 100

8TH LN NE

Poor

Over: GREENFIELD SO CANAL 039

8M NE FAIRFIELD, Teton, MT

Built 1966 Load: 14.5 t ADT: 100

NO DATA ENTERED

Poor

Over: ROCK CR

NO DATA ENTERED, Sanders, MT

Built 1954 Load: 14.9 t ADT: 50

SEIFERT RD

Poor

Over: PABLO A CANAL 083

6M SW POLSON, Lake, MT

Built 1960 Load: 15.4 t ADT: 100

OLD HWY 10 W

Poor

Over: CLARK FORK 054

3M W ALBERTON, Mineral, MT

Built 1932 Load: 15.4 t ADT: 349

Showing 4,801-4,850 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.