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 15

Fair

Over: RED ROCK RIVER

6.2M S CLARK CANYON DAM, Beaverhead, MT

Built 1981 Load: 21.8 t ADT: 2,089

NISSEN LN

Fair

Over: EAST BENCH CANAL 001

3M E DILLON, Beaverhead, MT

Built 1962 Load: 21.8 t ADT: 100

MT-43 FH 20

Fair

Over: TRAIL CREEK

12M W WISDOM, Beaverhead, MT

Built 1961 Load: 21.8 t ADT: 431

S 324

Fair

Over: CLARK CANYON DAM SPLWY

CLARK CANYON DAM, Beaverhead, MT

Built 1962 Load: 21.8 t ADT: 389

IRR BIA RTE 16

Fair

Over: LODGE GRASS CREEK

AT LODGE GRASS, Big Horn, MT

Built 1962 Load: 21.8 t ADT: 300

STEPHENS RD

Fair

Over: FORT BELKNAP CANAL 007

1M NW CHINOOK, Blaine, MT

Built 1999 Load: 21.8 t ADT: 211

COAL MINE RD

Fair

Over: RED ROCK COULEE 012

5M NW CHINOOK, Blaine, MT

Built 1933 Load: 21.8 t ADT: 41

MAIN ST N

Fair

Over: THIRTY MILE CREEK

HARLEM, Blaine, MT

Built 1957 Load: 21.8 t ADT: 543

OLD US 91

Fair

Over: MISSOURI RIVER-RR 069

11M S CASCADE, Cascade, MT

Built 1931 Load: 21.8 t ADT: 314

US 87

Fair

Over: ABANDONED RAILROAD

6M SW LOMA, Chouteau, MT

Built 1974 Load: 21.8 t ADT: 1,667

TUSLER RD

Fair

Over: YELLOWSTONE RIVER 094

9M NE MILES CITY, Custer, MT

Built 1907 Load: 21.8 t ADT: 102

ROAD 217

Fair

Over: BAD ROUTE CREEK 028

29M SW GLENDIVE, Dawson, MT

Built 1985 Load: 21.8 t ADT: 100

S 200

Fair

Over: BLUFF CREEK

14M SW RICHEY, Dawson, MT

Built 1959 Load: 21.8 t ADT: 237

S 1

Fair

Over: SILVER BOW CREEK

6M SW WARM SPRINGS, Deer Lodge, MT

Built 1964 Load: 21.8 t ADT: 4,553

S 1

Fair

Over: SILVER BOW CREEK

6M SW WARM SPRINGS, Deer Lodge, MT

Built 1964 Load: 21.8 t ADT: 4,553

WASHBOARD RD

Fair

Over: DOG CREEK 101

W SUFFOLK, Fergus, MT

Built 1983 Load: 21.8 t ADT: 100

UPPER CHIPPEWA RD

Fair

Over: CHIPPEWA CREEK 004

5M NW GRASSRANGE, Fergus, MT

Built 1980 Load: 21.8 t ADT: 100

JENNI RD

Fair

Over: BEAVER CREEK 030

7M W LEWISTOWN, Fergus, MT

Built 1929 Load: 21.8 t ADT: 100

US 87

Fair

Over: S FORK MCDONALD CREEK

1M N GRASS RANGE, Fergus, MT

Built 1939 Load: 21.8 t ADT: 1,300

JP RD

Fair

Over: WHITEFISH RIVER 154

2M SE WHITEFISH, Flathead, MT

Built 1985 Load: 21.8 t ADT: 3,186

E EVERGREEN DR

Fair

Over: SPRING CREEK

KALISPELL-E EVERGREEN DR, Flathead, MT

Built 1938 Load: 21.8 t ADT: 2,857

KELLY CANYON RD

Fair

Over: ROCKY CREEK 042

2M E BOZEMAN, Gallatin, MT

Built 2001 Load: 21.8 t ADT: 100

LONE MOUNTAIN TRL

Fair

Over: MIDDLE FK W GALLATIN 004

BIG SKY-LONE MOUNTAIN TRL, Gallatin, MT

Built 1979 Load: 21.8 t ADT: 9,549

US 191-HUFFINE LN

Fair

Over: HYALITE CREEK

4M W BOZEMAN, Gallatin, MT

Built 1956 Load: 21.8 t ADT: 25,142

FRONTAGE RD-S 205

Fair

Over: DRAINAGE

2M NW MANHATTAN, Gallatin, MT

Built 1931 Load: 21.8 t ADT: 1,140

DRY CREEK RD

Fair

Over: DRY CREEK

10M N BELGRADE, Gallatin, MT

Built 1929 Load: 21.8 t ADT: 200

MANY GLACIER ROAD

Fair

Over: APIKUNI CREEK

10.3 miles west of U.S. R, Glacier, MT

Built 1931 Load: 21.8 t ADT: 452

CHIEF MOUNTAIN INT

Fair

Over: LEE CREEK

12.7 miles north of Saint, Glacier, MT

Built 1935 Load: 21.8 t ADT: 246

BUFFALO TRAIL

Fair

Over: MUSSELSHELL RIVER 003

2M E RYEGATE, Golden Valley, MT

Built 1915 Load: 21.8 t ADT: 100

MANY GLACIER ROAD

Fair

Over: WINDY CREEK

8.8 miles west of U.S. Ro, Granite, MT

Built 1931 Load: 21.8 t ADT: 452

WILLOW CREEK RD

Fair

Over: RED ROCK COULEE 009

12M N HAVRE, Hill, MT

Built 1969 Load: 21.8 t ADT: 100

I 90

Fair

Over: RR

5.6M W WHITEHALL, Jefferson, MT

Built 1966 Load: 21.8 t ADT: 4,591

TERRACE LAKE RD

Fair

Over: PABLO FEEDER CANAL 022

2M E RONAN, Lake, MT

Built 2009 Load: 21.8 t ADT: 100

APPLEGATE DR

Fair

Over: HELENA VALLEY CANAL 115

6M NW HELENA, Lewis and Clark, MT

Built 1958 Load: 21.8 t ADT: 1,526

S CRUSE AVE

Fair

Over: PEDESTRIAN UNDERPASS

HELENA-S CRUSE AVE, Lewis and Clark, MT

Built 1972 Load: 21.8 t ADT: 1,580

KOUNTZ RD

Fair

Over: JEFFERSON RIVER 017

3M E WHITEHALL, Madison, MT

Built 1973 Load: 21.8 t ADT: 264

S 200

Fair

Over: BUFFALO SPRING CREEK

1M NE CIRCLE, McCone, MT

Built 1960 Load: 21.8 t ADT: 237

S 200

Fair

Over: REDWATER RIVER

1M NE CIRCLE, McCone, MT

Built 1933 Load: 21.8 t ADT: 1,118

I 90 EB

Fair

Over: ST. REGIS RIVER

1.9M W ST. REGIS, Mineral, MT

Built 1981 Load: 21.8 t ADT: 3,180

OLD HWY 10 E

Fair

Over: CLARK FK-RR 060

ST REGIS, Mineral, MT

Built 1942 Load: 21.8 t ADT: 119

S 200

Fair

Over: BLACKFOOT RIVER

5M W POTOMAC, Missoula, MT

Built 1988 Load: 21.8 t ADT: 4,601

N RESERVE ST

Fair

Over: CLARK FORK RIVER

MISSOULA-N RESERVE ST, Missoula, MT

Built 1975 Load: 21.8 t ADT: 36,321

MURPHYS LN

Fair

Over: YELLOWSTONE RIVER 004

E EMIGRANT, Park, MT

Built 1949 Load: 21.8 t ADT: 1,444

S 244

Fair

Over: FLATWILLOW CREEK

6M SW FLATWILLOW, Petroleum, MT

Built 1939 Load: 21.8 t ADT: 207

OLD US HWY 2

Fair

Over: BEAVER CREEK OVERFLO 100

19M E MALTA, Phillips, MT

Built 1933 Load: 21.8 t ADT: 100

S 204-STAGE RD

Fair

Over: MILK RIVER

1M S DODSON, Phillips, MT

Built 1954 Load: 21.8 t ADT: 99

S 243

Fair

Over: MILK RIVER

5M N SACO, Phillips, MT

Built 1954 Load: 21.8 t ADT: 57

ROCK CREEK CATTLE

Fair

Over: CLARK FORK RIVER 038

5M N DEER LODGE, Powell, MT

Built 1989 Load: 21.8 t ADT: 275

ROCK CREEK CATTLE

Fair

Over: CLARK FORK RIVER 03

5M N DEER LODGE, Powell, MT

Built 1989 Load: 21.8 t ADT: 275

S FRONTAGE RD 011

Fair

Over: RACETRACK CREEK 067

7M S DEER LODGE, Powell, MT

Built 1930 Load: 21.8 t ADT: 899

Showing 1,251-1,300 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.