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

US 87

Fair

Over: DRAINAGE

4M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 29.0 t ADT: 1,300

US 87

Fair

Over: DRAINAGE

2M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 29.0 t ADT: 1,300

TRUMAN CR RD

Fair

Over: TRUMAN CREEK 173

17M W KALISPELL, Flathead, MT

Built 2008 Load: 29.0 t ADT: 100

US 2

Fair

Over: ASHLEY CREEK

5M SW KALISPELL, Flathead, MT

Built 2015 Load: 29.0 t ADT: 7,046

IRR - US 2

Fair

Over: FLATHEAD RIVER

COLUMBIA FALLS, Flathead, MT

Built 1977 Load: 29.0 t ADT: 21,763

SHADY LN

Fair

Over: SPRING CREEK

2M NE KALISPELL, Flathead, MT

Built 1984 Load: 29.0 t ADT: 6,358

US 191 FH 42

Fair

Over: WEST GALLATIN RIVER

17M SE BIG SKY, Gallatin, MT

Built 1959 Load: 29.0 t ADT: 2,214

S 86-BRIDGER DR

Fair

Over: BRIDGER CREEK

2M NE BOZEMAN, Gallatin, MT

Built 2005 Load: 29.0 t ADT: 8,393

US 12

Fair

Over: TWIN COULEE

1M E LAVINA, Golden Valley, MT

Built 1935 Load: 29.0 t ADT: 459

BEAVERHEAD DR

Fair

Over: CROW CREEK 071

3M S RONAN, Lake, MT

Built 2003 Load: 29.0 t ADT: 100

IRR - S 212

Fair

Over: MISSION CREEK

MOIESE, Lake, MT

Built 1959 Load: 29.0 t ADT: 905

S 21

Fair

Over: ELK CREEK 119

1M NE AUGUSTA, Lewis and Clark, MT

Built 1935 Load: 29.0 t ADT: 258

YORK RD

Fair

Over: PRICKLY PEAR CREEK

2M NE HELENA, Lewis and Clark, MT

Built 1941 Load: 29.0 t ADT: 5,244

US 2

Fair

Over: COTTONWOOD CREEK

CHESTER, Liberty, MT

Built 1953 Load: 29.0 t ADT: 2,244

W KOOTENAI RD

Fair

Over: YOUNG CREEK 139

10M NW REXFORD, Lincoln, MT

Built 1974 Load: 29.0 t ADT: 100

JACK CREEK RD

Fair

Over: JACK CREEK 027

10M E ENNIS, Madison, MT

Built 1952 Load: 29.0 t ADT: 175

S 13

Fair

Over: WOLF CREEK

2M S VIDA, McCone, MT

Built 1993 Load: 29.0 t ADT: 896

MAIN ST

Fair

Over: NORTH FORK SMITH RIVER

WHITE SULPHUR SPRINGS, Meagher, MT

Built 1962 Load: 29.0 t ADT: 576

S 360 FH 65

Fair

Over: SMITH RIVER

2M E FORT LOGAN, Meagher, MT

Built 1975 Load: 29.0 t ADT: 128

I 90 EB

Fair

Over: ST. REGIS RIVER

5.6M E DE BORGIA, Mineral, MT

Built 1980 Load: 29.0 t ADT: 3,676

I 90

Fair

Over: ST. REGIS RIVER

4.3M W ST. REGIS, Mineral, MT

Built 1981 Load: 29.0 t ADT: 3,180

US 12 FH 11

Fair

Over: LOLO CREEK

LOLO HOT SPRINGS, Missoula, MT

Built 1957 Load: 29.0 t ADT: 747

US 12

Fair

Over: DEAN CREEK

6M E LAVINA, Musselshell, MT

Built 1935 Load: 29.0 t ADT: 438

E RIVER RD

Fair

Over: YELLOWSTONE RIVER 043

3M NE PRAY, Park, MT

Built 1960 Load: 29.0 t ADT: 242

US 89

Fair

Over: ROCK CREEK

2M SE CLYDE PARK, Park, MT

Built 1984 Load: 29.0 t ADT: 1,430

US 2

Fair

Over: BEAVER CREEK

6M W SACO, Phillips, MT

Built 1966 Load: 29.0 t ADT: 1,250

IRR - US 89

Fair

Over: BIRCH CREEK

14M W VALIER, Pondera, MT

Built 1965 Load: 29.0 t ADT: 947

S 200

Fair

Over: N FORK BLACKFOOT RIVER

4M SE OVANDO, Powell, MT

Built 1956 Load: 29.0 t ADT: 2,663

S 141

Fair

Over: HALFWAY CREEK

12M NW AVON, Powell, MT

Built 1936 Load: 29.0 t ADT: 1,564

W MILWAUKEE AVE

Fair

Over: CLARK FORK RIVER

DEER LODGE, Powell, MT

Built 1940 Load: 29.0 t ADT: 3,252

S 253

Fair

Over: CEDAR CREEK

22M NW TERRY, Prairie, MT

Built 1947 Load: 29.0 t ADT: 366

SKALKAHO HWY

Fair

Over: CANAL 058

3M SE GRANTSDALE, Ravalli, MT

Built 1941 Load: 29.0 t ADT: 325

COUNTY ROAD 309

Fair

Over: LONE TREE CREEK 033

1M SE SIDNEY, Richland, MT

Built 1993 Load: 29.0 t ADT: 321

625

Fair

Over: SMITH CREEK 096

23M S SIDNEY, Richland, MT

Built 1994 Load: 29.0 t ADT: 100

S 200

Fair

Over: DRAINAGE

1M NW LAMBERT, Richland, MT

Built 2008 Load: 29.0 t ADT: 443

INGOMAR RD

Fair

Over: W FK FROZE TO DEATH 006

5M S INGOMAR, Rosebud, MT

Built 1979 Load: 29.0 t ADT: 100

CARTERSVILLE RD

Fair

Over: LITTLE PORCUPINE CR 027

8M NE FORSYTH, Rosebud, MT

Built 1970 Load: 29.0 t ADT: 100

US 12

Fair

Over: DRAINAGE

35M NW FORSYTH, Rosebud, MT

Built 1941 Load: 29.0 t ADT: 144

US 12

Fair

Over: DRAINAGE

32M NW FORSYTH, Rosebud, MT

Built 1941 Load: 29.0 t ADT: 144

BIRDLAND BAY RD

Fair

Over: CLARK FORK RIVER 001

2M W THOMPSON FALLS, Sanders, MT

Built 1928 Load: 29.0 t ADT: 100

S 200

Fair

Over: CLARK FORK RIVER

2M S PARADISE, Sanders, MT

Built 1996 Load: 29.0 t ADT: 2,835

TRAPPER CREEK RD

Fair

Over: BIG HOLE RIVER 008

W MELROSE, Silver Bow, MT

Built 2001 Load: 29.0 t ADT: 187

OLD US 10

Fair

Over: BERRY CREEK 024

8M E REED POINT, Stillwater, MT

Built 1931 Load: 29.0 t ADT: 100

N YELLOWSTONE TRL

Fair

Over: YELLOWSTONE RIVER 010

6M SW BIG TIMBER, Sweet Grass, MT

Built 2000 Load: 29.0 t ADT: 128

FOSTER RD

Fair

Over: TETON RIVER 068

1M NW CHOTEAU, Teton, MT

Built 1976 Load: 29.0 t ADT: 100

OLD HWY 10

Fair

Over: DRAINAGE 015

6M E HYSHAM, Treasure, MT

Built 1933 Load: 29.0 t ADT: 218

HINSDALE N RD

Fair

Over: SNAKE CREEK 042

27M N HINSDALE, Valley, MT

Built 1950 Load: 29.0 t ADT: 100

LIBERTY RD

Fair

Over: VANDALIA SOUTH CANAL 097

10M NW GLASGOW, Valley, MT

Built 2013 Load: 29.0 t ADT: 61

US 2

Fair

Over: ROCK CREEK CANAL

4M E HINSDALE, Valley, MT

Built 1996 Load: 29.0 t ADT: 1,313

S 7

Fair

Over: ASH CREEK

25M S WIBAUX, Wibaux, MT

Built 1942 Load: 29.0 t ADT: 578

Showing 2,101-2,150 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.