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

I 90

Poor

Over: ABANDONED RR

THREE FORKS, Gallatin, MT

Built 1969 Load: 37.2 t ADT: 8,465

S 1

Poor

Over: CLARK FORK

DRUMMOND, Granite, MT

Built 1966 Load: 37.2 t ADT: 1,329

VANDALIA RD

Poor

Over: MILK RIVER 012

N VANDALIA, Valley, MT

Built 1989 Load: 37.2 t ADT: 53

S 83 FH 15

Poor

Over: LION CREEK

17M S SWAN LAKE, Lake, MT

Built 1996 Load: 38.1 t ADT: 1,206

SKALKAHO HWY

Poor

Over: SKALKAHO CREEK 053

1M E GRANTSDALE, Ravalli, MT

Built 1941 Load: 38.1 t ADT: 1,703

RD 763

Poor

Over: FISHER RIVER

FISHER RIVER, Lincoln, MT

Built 1969 Load: 38.2 t ADT: 50

I 90

Poor

Over: ANTELOPE CREEK

11.2M W DRUMMOND, Granite, MT

Built 1971 Load: 39.0 t ADT: 100

48TH ST W

Poor

Over: BEAVER CREEK 046

2M SW HAVRE, Hill, MT

Built 1966 Load: 39.9 t ADT: 100

IRR - US 2

Poor

Over: DRAINAGE

1M W DODSON, Phillips, MT

Built 1973 Load: 39.9 t ADT: 1,283

RD 36

Poor

Over: WOLF CR

WOLF CREEK MP 2.6, Lincoln, MT

Built 1969 Load: 40.5 t ADT: 50

US 191

Poor

Over: S FORK AMERICAN FORK

11M S HARLOWTON, Wheatland, MT

Built 1941 Load: 40.8 t ADT: 702

RED BARN RD

Poor

Over: LITTLE BITTERROOT RV 064

8M NE HOT SPRINGS, Lake, MT

Built 1960 Load: 41.8 t ADT: 100

NO DATA ENTERED

Poor

Over: DALY CR

NO DATA ENTERED, Ravalli, MT

Built 1958 Load: 42.1 t ADT: 5

S 23

Poor

Over: YELLOWSTONE RIVER

2M S SIDNEY, Richland, MT

Built 1994 Load: 42.6 t ADT: 2,423

MULLAN RD

Poor

Over: IRRIGATION CANAL

6M SE FRENCHTOWN, Missoula, MT

Built 1970 Load: 43.5 t ADT: 1,605

STAGE RD

Poor

Over: BIG WARM CREEK 027

24M S DODSON, Phillips, MT

Built 2004 Load: 43.5 t ADT: 100

IRR BIA RTE 1012

Poor

Over: DRY CREEK CANAL

9 KM S.E. OF ST. IGNATIUS, Lake, MT

Built 1975 Load: 45.5 t ADT: 50

S 5TH AVE E

Poor

Over: DODSON SOUTH CANAL 131

SE MALTA, Phillips, MT

Built 1986 Load: 49.0 t ADT: 100

S.FK.YAAK/PIPE CR.

Poor

Over: YAAK RIVER

JCT 68/92, TOWN OF YAAK., Lincoln, MT

Built 1951 Load: 54.1 t ADT: 99

BATTLEFIELD ROAD

Poor

Over: MEDICINE TAIL COULEE

I-90, EXIT 510, EAST ON U, Big Horn, MT

Built 1938 Load: 83.4 t ADT: 150

S 16

Poor

Over: CRANE CREEK

CRANE, Richland, MT

Built 1957 Load: 89.8 t ADT: 2,766

ROAD 261

Poor

Over: CRACKERBOX CREEK 043

16M SW GLENDIVE, Dawson, MT

Built 1997 Load: 99.9 t ADT: 21

CABIN CREEK LOOP

Poor

Over: CABIN CREEK 057

22M N PLEVNA, Fallon, MT

Built 1980 Load: 99.9 t ADT: 30

SCHAEFER RD

Poor

Over: PABLO FEEDER CANAL 086

4M SE POLSON, Lake, MT

Built 1985 Load: 99.9 t ADT: 100

IRR - US 2

Poor

Over: CHELSEA CREEK

12M E WOLF POINT, Roosevelt, MT

Built 1960 Load: 99.9 t ADT: 2,359

IRR - US 2

Poor

Over: DRAINAGE

3M E POPLAR, Roosevelt, MT

Built 1970 Load: 99.9 t ADT: 1,577

NO DATA ENTERED

Structurally Deficient

Over: EF CHICKEN CREEK

NO DATA ENTERED, Carbon, MT

Built 2021 ADT: 50

WESTMORE ROAD

Structurally Deficient

Over: SANDSTONE CREEK

15 M NW PLEVNA, Fallon, MT

Built 1920 ADT: 100

MAIN BOULDER ROAD

Structurally Deficient

Over: BOULDER RIVER

38 M SOUTH OF SPRINGDALE, Park, MT

Built 1950 ADT: 156

BLACK COULEE RD

Structurally Deficient

Over: BLACK COULEE 072

28M N DODSON, Phillips, MT

Built 1950 ADT: 49

SLEEPY HOLLOW LN

Structurally Deficient

Over: PRICKLY PEAR CREEK

3 M S MONTANA CITY, Jefferson, MT

Built 2010 Load: 2.7 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

COAL CREEK RD

Structurally Deficient

Over: COAL CREEK 027

12M N PEERLESS, Daniels, MT

Built 1950 Load: 3.6 t ADT: 100

IRR BIA RTE 123

Structurally Deficient

Over: SOUTH FORK VALLEY CREEK

10.3 KM FROM US HWY 93, Sanders, MT

Built 1995 Load: 4.1 t ADT: 20

COUNTY ROAD 224

Structurally Deficient

Over: COAL CREEK 010

16M N PEERLESS, Daniels, MT

Built 1960 Load: 4.5 t ADT: 100

W BROADWAY STREET

Structurally Deficient

Over: BIG SPRING CREEK 062

LEWISTOWN-W BROADWAY ST, Fergus, MT

Built 1940 Load: 4.5 t ADT: 100

VALLEY RD

Structurally Deficient

Over: CROW CREEK 066

10M SW RONAN, Lake, MT

Built 1965 Load: 4.5 t ADT: 100

MOUNTAIN VIEW RD

Structurally Deficient

Over: PABLO FEEDER CANAL 004

6M SE POLSON, Lake, MT

Built 1982 Load: 4.5 t ADT: 100

PISHKUN ROAD

Structurally Deficient

Over: Sun River

19 miles NW of Augusta, Lewis and Clark, MT

Built 1916 Load: 4.5 t ADT: 40

FOX FARM RD

Structurally Deficient

Over: ESPEIL COULEE 008

9M E GLASGOW, Valley, MT

Built 1930 Load: 4.5 t ADT: 100

OLD TOWN RD

Structurally Deficient

Over: JEFFERSON RIVER 063

2M N THREE FORKS, Gallatin, MT

Built 1894 Load: 5.4 t ADT: 100

HOMESTEAD DR

Structurally Deficient

Over: PINKHAM CREEK 140

9M SW EUREKA, Lincoln, MT

Built 1914 Load: 5.4 t ADT: 100

BIG SWAMP CR RD /

Structurally Deficient

Over: BIG HOLE RIVER 089

5M NW JACKSON, Beaverhead, MT

Built 1925 Load: 7.3 t ADT: 100

RYAN CANYON RD

Structurally Deficient

Over: BEAVERHEAD RIVER 023

1.2M S BARRETTS INT, Beaverhead, MT

Built 1908 Load: 7.3 t ADT: 14

HWY 287 BYPASS

Structurally Deficient

Over: MISSOURI RIVER 019

TOSTON, Broadwater, MT

Built 1920 Load: 7.3 t ADT: 175

PAULSON RD

Structurally Deficient

Over: PABLO A CANAL 034

5M S POLSON, Lake, MT

Built 1960 Load: 7.3 t ADT: 100

MCLEOD MAIN ST

Structurally Deficient

Over: WEST BOULDER RIVER 025

MCLEOD, Sweet Grass, MT

Built 1912 Load: 8.2 t ADT: 100

RANDALL RD

Structurally Deficient

Over: TWO LEGGIN`S CANAL 015

3M SW HARDIN, Big Horn, MT

Built 1940 Load: 9.1 t ADT: 100

WELCH RD

Structurally Deficient

Over: TWO MEDICINE CANAL 016

12M SW CUT BANK, Glacier, MT

Built 1960 Load: 9.1 t ADT: 100

HAMMOND CREEK RD

Structurally Deficient

Over: ROCK CREEK 025

5M E CLYDE PARK, Park, MT

Built 1967 Load: 10.9 t ADT: 100

Showing 5,051-5,100 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.