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

IRR - S 66

Fair

Over: WHITE BEAR CREEK

9M S FORT BELKNAP AGENCY, Blaine, MT

Built 1959 Load: 24.5 t ADT: 758

IRR - S 66

Fair

Over: THREE MILE COULEE

3M S FORT BELKNAP AGENCY, Blaine, MT

Built 1959 Load: 24.5 t ADT: 758

TURNER RD

Fair

Over: WAYNE CREEK

9M NE HARLEM, Blaine, MT

Built 1947 Load: 24.5 t ADT: 61

S 396-SAVOY RD

Fair

Over: THIRTY MILE CREEK

1M SE HARLEM, Blaine, MT

Built 1941 Load: 24.5 t ADT: 105

US 12

Fair

Over: MISSOURI RIVER

1M N TOWNSEND, Broadwater, MT

Built 1935 Load: 24.5 t ADT: 6,624

BRIDGER FROMBERG R

Fair

Over: BLUEWATER CREEK 001

2M SE FROMBERG, Carbon, MT

Built 1913 Load: 24.5 t ADT: 218

LOWER RIVER RD

Fair

Over: BLUEWATER CREEK 002

1M SE FROMBERG, Carbon, MT

Built 1932 Load: 24.5 t ADT: 100

US 310

Fair

Over: ROCK CREEK

ROCKVALE, Carbon, MT

Built 1934 Load: 24.5 t ADT: 5,030

OLD US 91

Fair

Over: NOVAK CREEK 005

12M S CASCADE, Cascade, MT

Built 1931 Load: 24.5 t ADT: 314

S 80

Fair

Over: TRIBUTARY FLAT CREEK

2M NW SQUARE BUTTE, Chouteau, MT

Built 1949 Load: 24.5 t ADT: 234

FRNTAGE ROAD 81020

Fair

Over: COTTONWOOD CREEK 083

19M NE MILES CITY, Custer, MT

Built 1928 Load: 24.5 t ADT: 504

KIRCHER CREEK RD

Fair

Over: T AND Y CANAL 032

4M NE MILES CITY, Custer, MT

Built 1938 Load: 24.5 t ADT: 100

POWDERVILLE RD

Fair

Over: SPRING CREEK 019

51M S MILES CITY, Custer, MT

Built 1912 Load: 24.5 t ADT: 47

IRR - S 251

Fair

Over: SMOKE CREEK

11M S FLAXVILLE, Daniels, MT

Built 1954 Load: 24.5 t ADT: 100

I 94

Fair

Over: GLENDIVE CREEK

1M E GLENDIVE, Dawson, MT

Built 1969 Load: 24.5 t ADT: 2,082

I 94

Fair

Over: GLENDIVE CREEK

1M E GLENDIVE, Dawson, MT

Built 1969 Load: 24.5 t ADT: 2,082

FRONTAGE ROAD 315

Fair

Over: GLENDIVE CREEK 084

1M E GLENDIVE, Dawson, MT

Built 1969 Load: 24.5 t ADT: 623

S 200S-TOWNE ST

Fair

Over: DRY CREEK

WEST GLENDIVE, Dawson, MT

Built 1959 Load: 24.5 t ADT: 2,602

S 200S-TOWNE ST

Fair

Over: DRY CREEK

WEST GLENDIVE, Dawson, MT

Built 1959 Load: 24.5 t ADT: 2,602

SURENUFF RD

Fair

Over: S FORK MCDONALD CR 002

FOREST GROVE, Fergus, MT

Built 1982 Load: 24.5 t ADT: 100

US 87

Fair

Over: DRAINAGE

12M E LEWISTOWN, Fergus, MT

Built 1930 Load: 24.5 t ADT: 1,442

S 80

Fair

Over: ARROW CREEK

17M S GERALDINE, Fergus, MT

Built 1949 Load: 24.5 t ADT: 170

HANOVER RD

Fair

Over: JUDITH RIVER

5M NE KOLIN, Fergus, MT

Built 1970 Load: 24.5 t ADT: 113

FISH HATCHERY RD

Fair

Over: E FORK BIG SPRING CREEK

4M SE LEWISTOWN, Fergus, MT

Built 1966 Load: 24.5 t ADT: 161

GOING-TO-THE-SUN R

Fair

Over: LOGAN CREEK

21.5 miles northeast of U, Flathead, MT

Built 1925 Load: 24.5 t ADT: 1,230

GOING-TO-THE-SUN R

Fair

Over: DRY RAVINE

31 miles northeast of U.S, Flathead, MT

Built 1934 Load: 24.5 t ADT: 1,942

GOING-TO-THE-SUN R

Fair

Over: HAYSTACK CREEK

28 Mi. N. of Jct. Hwy. 2, Flathead, MT

Built 1935 Load: 24.5 t ADT: 1,942

E EDGEWOOD DR

Fair

Over: HASKILL CREEK 071

2M E WHITEFISH, Flathead, MT

Built 1994 Load: 24.5 t ADT: 1,188

W RESERVE DR

Fair

Over: STILLWATER RIVER

3M NW KALISPELL, Flathead, MT

Built 1983 Load: 24.5 t ADT: 100

S 84-NORRIS RD

Fair

Over: GALLATIN RIVER

7M W BOZEMAN, Gallatin, MT

Built 1987 Load: 24.5 t ADT: 10,643

FRONTAGE RD-S 205

Fair

Over: BAKER CREEK

2M SE MANHATTAN, Gallatin, MT

Built 1921 Load: 24.5 t ADT: 2,232

W DRY CREEK RD

Fair

Over: GALLATIN RIVER

2M E MANHATTAN, Gallatin, MT

Built 1967 Load: 24.5 t ADT: 1,263

S 200

Fair

Over: MUSSELSHELL RIVER

MOSBY, Garfield, MT

Built 1973 Load: 24.5 t ADT: 532

IRR BIA RTE 1

Fair

Over: LITTLE BADGER CREEK

24.1 KM SOUTH OF BROWNING, Glacier, MT

Built 1972 Load: 24.5 t ADT: 1,000

IRR BIA RTE 25

Fair

Over: BADGER CREEK

10 KM NORTH HEART BUTTE, Glacier, MT

Built 1979 Load: 24.5 t ADT: 30

IRR RTE BIA 55

Fair

Over: WILLOW CREEK TRIBUTARY

AT BLACKFOOT, Glacier, MT

Built 2005 Load: 24.5 t ADT: 70

IRR - US 2

Fair

Over: FLATIRON CREEK

BLACKFOOT, Glacier, MT

Built 1957 Load: 24.5 t ADT: 2,054

BELMONT RD

Fair

Over: BIG COULEE CREEK 010

2M S LAVINA, Golden Valley, MT

Built 1975 Load: 24.5 t ADT: 10

S 300

Fair

Over: MUSSELSHELL RIVER

RYEGATE, Golden Valley, MT

Built 1962 Load: 24.5 t ADT: 171

S 1

Fair

Over: FRED BURR CREEK

2M S PHILIPSBURG, Granite, MT

Built 1931 Load: 24.5 t ADT: 1,663

IRR BIA RTE 133

Fair

Over: BOX ELDER CREEK

.2 S RTE 24,1.6 SE SANGRY, Hill, MT

Built 1984 Load: 24.5 t ADT: 60

FRESNO RES RD

Fair

Over: FRESNO RES SPILLWAY 038

12M NW HAVRE, Hill, MT

Built 1937 Load: 24.5 t ADT: 231

I 15

Fair

Over: ABANDONED RR

0.6M S MONTANA CITY, Jefferson, MT

Built 1969 Load: 24.5 t ADT: 3,739

CATTLE DRIVE RD

Fair

Over: BOULDER RIVER 017

2M W BOULDER, Jefferson, MT

Built 1983 Load: 24.5 t ADT: 100

I 15 FRONTAGE RD

Fair

Over: BISON CREEK 047

4M W BASIN, Jefferson, MT

Built 1985 Load: 24.5 t ADT: 100

MT HWY 2

Fair

Over: BOULDER RIVER 064

1M E CARDWELL, Jefferson, MT

Built 1968 Load: 24.5 t ADT: 385

TEBAY LN

Fair

Over: JEFFERSON RIVER 012

3M W CARDWELL, Jefferson, MT

Built 1986 Load: 24.5 t ADT: 177

S 41

Fair

Over: LITTLE PIPESTONE CREEK

9M E PIPESTONE PASS, Jefferson, MT

Built 1934 Load: 24.5 t ADT: 464

PHILBROOK RD

Fair

Over: JUDITH RIVER 013

4M W HOBSON, Judith Basin, MT

Built 1983 Load: 24.5 t ADT: 100

US 87

Fair

Over: JUDITH RIVER

1M N HOBSON, Judith Basin, MT

Built 1971 Load: 24.5 t ADT: 2,459

Showing 1,551-1,600 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.