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

PINEVIEW RD

Fair

Over: DEADMAN CREEK 128

30M NW CUSTER, Yellowstone, MT

Built 1997 Load: 20.1 t ADT: 100

FS ROUTE 83

Fair

Over: BIG HOLE RIVER

BIG HOLE RIVER, Beaverhead, MT

Built 1950 Load: 20.4 t ADT: 50

IRR - I 90

Fair

Over: LITTLE BIGHORN RIVER

8M S CROW AGENCY, Big Horn, MT

Built 1956 Load: 20.4 t ADT: 2,055

NFSR 834

Fair

Over: GRAVEYARD GULCH CREEK

1.4 MILES WEST US89, Cascade, MT

Built 1953 Load: 20.4 t ADT: 50

FOREST ROAD

Fair

Over: HALL CREEK

SWAN LAKE CAMPGROUND, Flathead, MT

Built 1997 Load: 20.4 t ADT: 50

RD 231

Fair

Over: W FISHER CR

THUNDER MTN RANCH, Lincoln, MT

Built 1954 Load: 20.4 t ADT: 50

FDR #204

Fair

Over: MOOSE CREEK

6 MI NE OF RD 119/204 JCT, Meagher, MT

Built 1956 Load: 20.4 t ADT: 50

WEST FK BUTTE RD

Fair

Over: LOLO CR

WEST FK BUTTE, Missoula, MT

Built 1936 Load: 20.4 t ADT: 50

MARSHALL LAKE RD

Fair

Over: W FK CLEARWATER RIVER

MARSHALL LK, Missoula, MT

Built 1963 Load: 20.4 t ADT: 540

RD 7583

Fair

Over: W FORK SWAMP CR

BEMISH CR, Sanders, MT

Built 1970 Load: 20.4 t ADT: 50

RD 153

Fair

Over: CLEAR CR

CLEAR CR, Sanders, MT

Built 1968 Load: 20.4 t ADT: 50

LOWER CANAL RD

Fair

Over: FLY CREEK 143

2M SW POMPEY`S PILLAR, Yellowstone, MT

Built 1983 Load: 20.4 t ADT: 100

FDR 90

Fair

Over: STEEL CR

STEEL CR, Beaverhead, MT

Built 1954 Load: 20.7 t ADT: 40

LOOKOUT CREEK RD

Fair

Over: BIG CREEK

1 MI FROM BIG CREEK RD, Flathead, MT

Built 1962 Load: 20.7 t ADT: 10

PINKHAM TENMILE RD

Fair

Over: PINKHAM CR

PINKHAM CR, Lincoln, MT

Built 1992 Load: 20.7 t ADT: 50

1127: DRY FORK

Fair

Over: BEAUCHAMP CREEK

13 mi SE of US 191, Phillips, MT

Built 1972 Load: 20.7 t ADT: 25

ROUTE 362

Fair

Over: W F BITTERROOT

NO DATA ENTERED, Ravalli, MT

Built 1957 Load: 20.7 t ADT: 20

LITTLE HORN RD

Fair

Over: LITTLE BIGHORN RIVER 072

8M SW WYOLA, Big Horn, MT

Built 1952 Load: 20.8 t ADT: 243

WATER STREET

Fair

Over: BIG SPRING CREEK 059

LEWISTOWN-WATER ST, Fergus, MT

Built 1930 Load: 20.8 t ADT: 100

US 191 FH 42

Fair

Over: SPANISH CREEK

7M S GALLATIN GATEWAY, Gallatin, MT

Built 1931 Load: 20.8 t ADT: 8,666

BELLE CREEK RD

Fair

Over: LITTLE POWDER RIVER 011

20M S BROADUS, Powder River, MT

Built 1970 Load: 20.8 t ADT: 50

THORNING LOOP

Fair

Over: RYE CREEK 064

4M S DARBY, Ravalli, MT

Built 1975 Load: 20.8 t ADT: 100

E REDSTONE RD

Fair

Over: BIG MUDDY CREEK 021

E REDSTONE, Sheridan, MT

Built 1960 Load: 20.8 t ADT: 100

CEMETERY RD

Fair

Over: VALLEY CREEK 039

2M W PARK CITY, Stillwater, MT

Built 1940 Load: 20.8 t ADT: 100

OLD US 10

Fair

Over: HENSLEY CREEK 014

5M SE COLUMBUS, Stillwater, MT

Built 1928 Load: 20.8 t ADT: 1,607

OLD HWY 10

Fair

Over: BIGHORN RIVER 126

4M E CUSTER, Yellowstone, MT

Built 1930 Load: 20.8 t ADT: 100

US 2

Fair

Over: FIFTEEN MILE CREEK

1M E ZURICH, Blaine, MT

Built 1948 Load: 20.9 t ADT: 1,875

LODGE CREEK RD

Fair

Over: DRAINAGE-STOCKPASS

1M NE CHINOOK, Blaine, MT

Built 1952 Load: 20.9 t ADT: 100

PARKER RD

Fair

Over: SUN RIVER SLOUGH 060

4M W SUN RIVER, Cascade, MT

Built 1950 Load: 20.9 t ADT: 100

SHONKIN RD

Fair

Over: SHONKIN CREEK 017

1M W SHONKIN, Chouteau, MT

Built 2011 Load: 20.9 t ADT: 40

S 248

Fair

Over: POPLAR RIVER

2M W SCOBEY, Daniels, MT

Built 1940 Load: 20.9 t ADT: 390

I 94

Fair

Over: YELLOWSTONE RIVER

N GLENDIVE, Dawson, MT

Built 1968 Load: 20.9 t ADT: 2,894

I 94

Fair

Over: YELLOWSTONE RIVER

N GLENDIVE, Dawson, MT

Built 1968 Load: 20.9 t ADT: 2,894

US 12

Fair

Over: RR

2M SE BAKER, Fallon, MT

Built 1968 Load: 20.9 t ADT: 671

COUNTY ROAD 116

Fair

Over: ARMELLS CREEK 115

10M NE HILGER, Fergus, MT

Built 1977 Load: 20.9 t ADT: 100

GRINDE RD

Fair

Over: WARM SPRINGS CREEK 009

4M SW HILGER, Fergus, MT

Built 1986 Load: 20.9 t ADT: 100

U BET RD

Fair

Over: ROSS FORK CREEK 026

W GARNEILL, Fergus, MT

Built 1987 Load: 20.9 t ADT: 36

UPPER SPRING CR RD

Fair

Over: MILL DITCH

LEWISTOWN, Fergus, MT

Built 1958 Load: 20.9 t ADT: 6,241

E BOULEVARD ST

Fair

Over: BIG SPRING CREEK

LEWISTOWN-E BOULEVARD ST, Fergus, MT

Built 1920 Load: 20.9 t ADT: 671

CAMAS ROAD

Fair

Over: NORTH FORK FLATHEAD RIVE

2 miles north of U.S. Rou, Flathead, MT

Built 1964 Load: 20.9 t ADT: 560

FISH CREEK CAMPGRO

Fair

Over: FISH CREEK

2 miles north of U.S. Rou, Flathead, MT

Built 1963 Load: 20.9 t ADT: 100

S 35

Fair

Over: SWAN RIVER

BIG FORK, Flathead, MT

Built 1954 Load: 20.9 t ADT: 9,074

MAIDEN ROCK RD

Fair

Over: BRIDGER CREEK 107

2M E BOZEMAN, Gallatin, MT

Built 1922 Load: 20.9 t ADT: 100

MOFFIT GULCH RD

Fair

Over: ROCKY CREEK 044

3M SE BOZEMAN, Gallatin, MT

Built 1976 Load: 20.9 t ADT: 146

US 287

Fair

Over: BEAVER CREEK

24M NW WEST YELLOWSTONE, Gallatin, MT

Built 1964 Load: 20.9 t ADT: 945

I 15

Fair

Over: BOULDER RIVER

1.9M W BOULDER, Jefferson, MT

Built 1980 Load: 20.9 t ADT: 1,904

USFS ROAD 039

Fair

Over: YAAK RIVER 039

15M N TROY, Lincoln, MT

Built 1934 Load: 20.9 t ADT: 22

LAKE CREEK RD

Fair

Over: KEELER CREEK 087

10M S TROY, Lincoln, MT

Built 1974 Load: 20.9 t ADT: 100

S 252-HORSE CR RD

Fair

Over: HORSE CREEK

8M NW CIRCLE, McCone, MT

Built 1950 Load: 20.9 t ADT: 103

S 467-UNION RD

Fair

Over: MCCUNE CREEK

4M S CIRCLE, McCone, MT

Built 1962 Load: 20.9 t ADT: 77

Showing 1,151-1,200 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.