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 7

Fair

Over: DRAINAGE-STOCKPASS

17M S WIBAUX, Wibaux, MT

Built 1941 Load: 29.0 t ADT: 624

SAINT PHILIP RD

Fair

Over: DRAINAGE

15M SE WIBAUX, Wibaux, MT

Built 1954 Load: 29.0 t ADT: 40

I 90

Fair

Over: CANYON CREEK

3.1M W BILLINGS, Yellowstone, MT

Built 1959 Load: 29.0 t ADT: 14,099

I 90

Fair

Over: CANYON CREEK

3.1M W BILLINGS, Yellowstone, MT

Built 1959 Load: 29.0 t ADT: 14,099

ROBINDALE DR

Fair

Over: BLUE CREEK 123

4M SE BILLINGS, Yellowstone, MT

Built 2013 Load: 29.0 t ADT: 100

STEWART ST

Fair

Over: SILVERBOW CREEK 012

E OPPORTUNITY, Deer Lodge, MT

Built 1969 Load: 29.1 t ADT: 109

10TH ST W

Fair

Over: RED ROCK COULEE 096

W EDGE CHINOOK, Blaine, MT

Built 1985 Load: 29.2 t ADT: 100

FOREST ROAD

Fair

Over: WHEELER CREEK

WEST SIDE RESERVOIR, Flathead, MT

Built 1952 Load: 29.2 t ADT: 65

NFSR

Fair

Over: MOOSE CREEK

NORTH FORK FLATHEAD, Flathead, MT

Built 2009 Load: 29.2 t ADT: 40

ROUTE 49

Fair

Over: W F BITTERROOT

NO DATA ENTERED, Ravalli, MT

Built 1964 Load: 29.2 t ADT: 21

COUNTY ROAD 332

Fair

Over: USBR MAIN CANAL 052

3M S SAVAGE, Richland, MT

Built 1999 Load: 29.2 t ADT: 100

HITCHCOCK RD

Fair

Over: DRY WOLF CREEK 095

5M SE DENTON, Fergus, MT

Built 1980 Load: 29.3 t ADT: 4

FOREST ROAD

Fair

Over: COAL CREEK

COAL CREEK ROAD, Flathead, MT

Built 1961 Load: 29.5 t ADT: 5

FDR 211

Fair

Over: FOUR MILE CREEK

5.8 MI SE US12/FDR211 JCT, Meagher, MT

Built 1972 Load: 29.5 t ADT: 50

BIRCH CREEK RD

Fair

Over: SMITH RIVER 001

4M NW WHITE SULPHUR SPR, Meagher, MT

Built 1973 Load: 29.8 t ADT: 100

W.FK.MILL CR. RD.

Fair

Over: W.FORK MILL CREEK

S. OF LIVINGSTON, Park, MT

Built 1971 Load: 29.8 t ADT: 50

EMERSON RD

Fair

Over: LITTLE BITTERROOT RV 092

9M NE HOT SPRINGS, Sanders, MT

Built 2002 Load: 29.8 t ADT: 100

POLY DR

Fair

Over: BBWA CANAL 040

BILLINGS-POLY DR, Yellowstone, MT

Built 1971 Load: 29.8 t ADT: 6,084

CENTRAL AVE

Fair

Over: BBWA CANAL

BILLINGS-CENTRAL AVE, Yellowstone, MT

Built 1978 Load: 29.8 t ADT: 18,183

I 15

Fair

Over: BEAVERHEAD RIVER

CLARK CANYON DAM, Beaverhead, MT

Built 1981 Load: 29.9 t ADT: 2,836

I 15

Fair

Over: BEAVERHEAD RIVER

8M N CLARK CANYON DAM, Beaverhead, MT

Built 1980 Load: 29.9 t ADT: 2,210

LOWER N FORK RD

Fair

Over: SWAMP CREEK 070

3M N WISDOM, Beaverhead, MT

Built 1975 Load: 29.9 t ADT: 44

IRR - I 90

Fair

Over: SEP LOCAL ROAD

8.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 29.9 t ADT: 1,978

IRR - I 90

Fair

Over: SEP LOCAL ROAD

8.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 29.9 t ADT: 1,978

TULLOCK CR RD

Fair

Over: TULLOCK CREEK 029

15M NE HARDIN, Big Horn, MT

Built 2006 Load: 29.9 t ADT: 35

IRR - S 451

Fair

Over: LODGE GRASS CREEK

LODGE GRASS, Big Horn, MT

Built 1955 Load: 29.9 t ADT: 536

DRY HOLLOW RD

Fair

Over: BROADWATER MISSOURI 015

3M N TOSTON, Broadwater, MT

Built 1976 Load: 29.9 t ADT: 100

MILL IRON CAMP CRO

Fair

Over: BOX ELDER CREEK 006

2M SE MILL IRON, Carter, MT

Built 1965 Load: 29.9 t ADT: 74

S 7

Fair

Over: DRAINAGE

8M NE EKALAKA, Carter, MT

Built 1940 Load: 29.9 t ADT: 390

EVANS RICEVILLE RD

Fair

Over: BELT CREEK 015

12M N MONARCH, Cascade, MT

Built 1962 Load: 29.9 t ADT: 100

I 94

Fair

Over: SEP ACCESS ROAD

23M NE MILES CITY, Custer, MT

Built 1971 Load: 29.9 t ADT: 2,110

I 94

Fair

Over: SEP ACCESS ROAD

23M NE MILES CITY, Custer, MT

Built 1971 Load: 29.9 t ADT: 2,110

COUNTY ROAD 214

Fair

Over: PUMPKIN CREEK 043

6M SW VOLBORG, Custer, MT

Built 1968 Load: 29.9 t ADT: 33

ROAD 223

Fair

Over: CLEAR CREEK 036

7M S LINDSAY, Dawson, MT

Built 1988 Load: 29.9 t ADT: 74

I 90

Fair

Over: WILLOW CREEK

2.5M N OPPORTUNITY, Deer Lodge, MT

Built 1978 Load: 29.9 t ADT: 10,105

US 12

Fair

Over: O`FALLON CREEK

11M W PLEVNA, Fallon, MT

Built 1971 Load: 29.9 t ADT: 513

BUTCHER RD

Fair

Over: DOG CREEK 107

4M S WINIFRED, Fergus, MT

Built 1962 Load: 29.9 t ADT: 100

US 87-W MAIN ST

Fair

Over: BIG SPRING CREEK

LEWISTOWN-W MAIN ST, Fergus, MT

Built 1962 Load: 29.9 t ADT: 5,247

US 87

Fair

Over: ELK CREEK

5M SE GRASS RANGE, Fergus, MT

Built 1952 Load: 29.9 t ADT: 1,038

BROWN MEADOW RD

Fair

Over: UPPER MOUNT CREEK 174

17M W KALISPELL, Flathead, MT

Built 2008 Load: 29.9 t ADT: 100

FARM TO MARKET RD

Fair

Over: STILLWATER RIVER 084

12M W WHITEFISH, Flathead, MT

Built 1980 Load: 29.9 t ADT: 333

AIRPORT RD

Fair

Over: ASHLEY CREEK

KALISPELL-AIRPORT RD, Flathead, MT

Built 1982 Load: 29.9 t ADT: 4,802

US 287

Fair

Over: RR

11M SW THREE FORKS, Gallatin, MT

Built 1950 Load: 29.9 t ADT: 1,204

FRONTAGE RD-S 205

Fair

Over: RR

LOGAN, Gallatin, MT

Built 2007 Load: 29.9 t ADT: 1,140

S 19TH RD

Fair

Over: HYALITE CREEK

6M SW BOZEMAN, Gallatin, MT

Built 1988 Load: 29.9 t ADT: 1,821

MAIN ST

Fair

Over: BERGMAN SLOUGH 019

DRUMMOND-MAIN STREET, Granite, MT

Built 1934 Load: 29.9 t ADT: 544

S 1

Fair

Over: WILLOW CREEK

4M S DRUMMOND, Granite, MT

Built 1999 Load: 29.9 t ADT: 1,260

GALENA GULCH RD

Fair

Over: BOULDER RIVER 016

4M E BASIN, Jefferson, MT

Built 2003 Load: 29.9 t ADT: 100

CRAIG FRONTAGE RD

Fair

Over: STICKNEY CREEK 057

2M N CRAIG, Lewis and Clark, MT

Built 1968 Load: 29.9 t ADT: 327

E MAIN STREET

Fair

Over: PRICKLY PEAR CREEK 009

EAST HELENA-E MAIN ST, Lewis and Clark, MT

Built 1934 Load: 29.9 t ADT: 2,565

Showing 2,151-2,200 of 5,122 bridges

Related

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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.