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

S 59

Fair

Over: SOUTH FORK SUNDAY CREEK

3M NW MILES CITY, Custer, MT

Built 1930 Load: 22.7 t ADT: 1,465

WHOOPUP RD-RD 248

Fair

Over: IRRIGATION CANAL 048

10M S GLENDIVE, Dawson, MT

Built 1940 Load: 22.7 t ADT: 72

S 254

Fair

Over: LOWER SEVEN MILE CREEK

6M S BLOOMFIELD, Dawson, MT

Built 1952 Load: 22.7 t ADT: 319

S 43

Fair

Over: BIG HOLE RIVER

16M NE WISDOM, Deer Lodge, MT

Built 1960 Load: 22.7 t ADT: 330

ROSE CREEK RD

Fair

Over: ROSE CREEK 108

3M E WINIFRED, Fergus, MT

Built 1980 Load: 22.7 t ADT: 100

S FORK RD

Fair

Over: FLATWILLOW CREEK 124

14M SE FORESTGROVE, Fergus, MT

Built 1986 Load: 22.7 t ADT: 100

GRAVES RD

Fair

Over: FLATWILLOW CREEK 001

20M S GRASSRANGE, Fergus, MT

Built 1988 Load: 22.7 t ADT: 100

US 87

Fair

Over: N FORK MCDONALD CREEK

8M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 22.7 t ADT: 1,300

US 87

Fair

Over: DRAINAGE

2M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 22.7 t ADT: 1,300

DERN RD

Fair

Over: ASHLEY CREEK 005

1M W KALISPELL, Flathead, MT

Built 2005 Load: 22.7 t ADT: 100

E COTTONWOOD DR

Fair

Over: SPRING CREEK 150

KALISPELL-E COTTONWOOD DR, Flathead, MT

Built 1991 Load: 22.7 t ADT: 100

SECOND ST

Fair

Over: WHITEFISH RIVER

WHITEFISH-SECOND ST, Flathead, MT

Built 2013 Load: 22.7 t ADT: 11,535

S 65

Fair

Over: MIDDLE FK FLATHEAD RIVER

WEST GLACIER, Flathead, MT

Built 1966 Load: 22.7 t ADT: 5,293

TWIN BRIDGES RD

Fair

Over: STILLWATER RIVER

5M SW WHITEFISH, Flathead, MT

Built 1988 Load: 22.7 t ADT: 1,990

OLD YELLOWSTONE TR

Fair

Over: WILLOW CREEK

1M S WILLOW CREEK, Gallatin, MT

Built 1949 Load: 22.7 t ADT: 131

W DRY CREEK RD

Fair

Over: EAST GALLATIN RIVER

5M E MANHATTAN, Gallatin, MT

Built 1967 Load: 22.7 t ADT: 810

AMSTERDAM RD

Fair

Over: BAKER CREEK

4M SW BELGRADE, Gallatin, MT

Built 1952 Load: 22.7 t ADT: 2,207

GOING-TO-THE-SUN R

Fair

Over: BARING CREEK

9.7 miles southwest of U., Glacier, MT

Built 1932 Load: 22.7 t ADT: 1,942

GOING-TO-THE-SUN R

Fair

Over: DIVIDE CREEK

0.2 miles northwest of U., Glacier, MT

Built 1934 Load: 22.7 t ADT: 1,942

US 89

Fair

Over: TWO MEDICINE RIVER

11M SE BROWNING, Glacier, MT

Built 1950 Load: 22.7 t ADT: 1,184

US 87

Fair

Over: GRAVEL COULEE

9M NE BOX ELDER, Hill, MT

Built 1954 Load: 22.7 t ADT: 1,816

MT HWY 2

Fair

Over: BIG PIPESTONE CREEK 062

4M W WHITEHALL, Jefferson, MT

Built 1931 Load: 22.7 t ADT: 579

S 2

Fair

Over: RADER CREEK

7M E PIPESTONE PASS, Jefferson, MT

Built 1931 Load: 22.7 t ADT: 673

S 2

Fair

Over: WHITETAIL CREEK

WHITEHALL, Jefferson, MT

Built 1955 Load: 22.7 t ADT: 1,393

S 239

Fair

Over: JUDITH RIVER

2M W HOBSON, Judith Basin, MT

Built 1961 Load: 22.7 t ADT: 533

SILVER BUTTE RD

Fair

Over: EAST FISHER CREEK 076

10M W HAPPY`S INN, Lincoln, MT

Built 1975 Load: 22.7 t ADT: 100

HAMMER CUTOFF RD

Fair

Over: LIBBY CREEK

9M S LIBBY, Lincoln, MT

Built 1972 Load: 22.7 t ADT: 283

S 359

Fair

Over: BRICKER SPARROW DITCH

JEFFERSON ISLAND, Madison, MT

Built 1958 Load: 22.7 t ADT: 1,402

SUNNYSIDE RD

Fair

Over: REDWATER RIVER 014

22M SE WOLF POINT, McCone, MT

Built 1989 Load: 22.7 t ADT: 100

MADISON ST-US 12

Fair

Over: CLARK FORK RIVER

MISSOULA-MADISON ST, Missoula, MT

Built 1958 Load: 22.7 t ADT: 21,606

MILL CREEK RD

Fair

Over: MILL CREEK 044

5M E EMIGRANT, Park, MT

Built 1972 Load: 22.7 t ADT: 242

S 540-E RIVER RD

Fair

Over: MILL CREEK

2M NE PRAY, Park, MT

Built 1925 Load: 22.7 t ADT: 892

DOVETAIL VALENTINE

Fair

Over: BUFFALO CREEK 006

6M N WINNETT, Petroleum, MT

Built 1983 Load: 22.7 t ADT: 100

S 244

Fair

Over: DRAINAGE

10M SW FLATWILLOW, Petroleum, MT

Built 1940 Load: 22.7 t ADT: 207

S 244

Fair

Over: MCDONALD CREEK

WINNETT, Petroleum, MT

Built 1941 Load: 22.7 t ADT: 244

US 191

Fair

Over: WHITEWATER CREEK

8M N LORING, Phillips, MT

Built 1958 Load: 22.7 t ADT: 94

IRR - S 358

Fair

Over: BIRCH CREEK

7M NW VALIER, Pondera, MT

Built 1965 Load: 22.7 t ADT: 290

CONRAD DUPUYER RD

Fair

Over: DRAINAGE

9M NW CONRAD, Pondera, MT

Built 1965 Load: 22.7 t ADT: 59

S 200

Fair

Over: MONTURE CREEK

3M NW OVANDO, Powell, MT

Built 1986 Load: 22.7 t ADT: 2,627

I 94

Fair

Over: RR

SW FALLON, Prairie, MT

Built 1977 Load: 22.7 t ADT: 2,191

NO DATA ENTERED

Fair

Over: OVERWHICH CR

NO DATA ENTERED, Ravalli, MT

Built 1964 Load: 22.7 t ADT: 2

S 201-1ST ST W

Fair

Over: USRS CANAL

FAIRVIEW, Richland, MT

Built 1934 Load: 22.7 t ADT: 1,018

IRR - US 2

Fair

Over: FLYNN CREEK

8M W WOLF POINT, Roosevelt, MT

Built 1956 Load: 22.7 t ADT: 1,405

US 2

Fair

Over: LITTLE MUDDY CREEK

4M E BAINVILLE, Roosevelt, MT

Built 2010 Load: 22.7 t ADT: 1,440

IRR - S 382

Fair

Over: FLATHEAD RIVER

1M E PERMA, Sanders, MT

Built 1965 Load: 22.7 t ADT: 384

OLD US 10

Fair

Over: BROWN CREEK 013

4M SE COLUMBUS, Stillwater, MT

Built 1935 Load: 22.7 t ADT: 1,607

OLD US 10

Fair

Over: LOWER DEER CREEK 006

2M NW GREYCLIFF, Sweet Grass, MT

Built 1928 Load: 22.7 t ADT: 342

US 191

Fair

Over: CAYUSE CREEK

1M NE MELVILLE, Sweet Grass, MT

Built 1947 Load: 22.7 t ADT: 657

US 287

Fair

Over: DRY WASH

6M S CHOTEAU, Teton, MT

Built 1936 Load: 22.7 t ADT: 446

FRONTAGE ROAD 018

Fair

Over: DRAINAGE 010

4M E HYSHAM, Treasure, MT

Built 1933 Load: 22.7 t ADT: 218

Showing 1,351-1,400 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.