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

GOING-TO-THE-SUN R

Fair

Over: ST. MARY RIVER

0.8 Mi. NW of Jct. Hwy. 8, Glacier, MT

Built 1934 Load: 28.1 t ADT: 1,230

I 15

Fair

Over: BOULDER RIVER

4.3M E BASIN, Jefferson, MT

Built 1980 Load: 28.1 t ADT: 3,807

I 15 FRONTAGE RD

Fair

Over: BOULDER RIVER 043

2M W BASIN, Jefferson, MT

Built 1985 Load: 28.1 t ADT: 100

OLD US HWY 93

Fair

Over: MUD CREEK 097

4M N RONAN, Lake, MT

Built 2007 Load: 28.1 t ADT: 100

S 83 FH 15

Fair

Over: LOST CREEK

3M S SWAN LAKE, Lake, MT

Built 1953 Load: 28.1 t ADT: 1,166

US 287

Fair

Over: MADISON RIVER

ENNIS, Madison, MT

Built 2001 Load: 28.1 t ADT: 4,210

S 528

Fair

Over: PRAIRIE ELK CREEK 021

10M SW WOLF POINT, McCone, MT

Built 1972 Load: 28.1 t ADT: 76

NICKWALL RD

Fair

Over: NICKWALL CREEK 012

20M NE VIDA, McCone, MT

Built 1970 Load: 28.1 t ADT: 100

S 252-WELDON RD

Fair

Over: HORSE CREEK

13M NW CIRCLE, McCone, MT

Built 1950 Load: 28.1 t ADT: 57

US 12

Fair

Over: FOUR MILE CREEK

6M NE WHITE SULPHUR SPR, Meagher, MT

Built 1937 Load: 28.1 t ADT: 477

US 89 FH 32

Fair

Over: NORTH FORK SMITH RIVER

2M NE WHITE SULPHUR SPR, Meagher, MT

Built 1955 Load: 28.1 t ADT: 596

I 90

Fair

Over: ST. REGIS RIVER

0.6M W SALTESE, Mineral, MT

Built 1973 Load: 28.1 t ADT: 7,745

I 90

Fair

Over: CLARK FORK RIVER

6.2M E SUPERIOR, Mineral, MT

Built 1967 Load: 28.1 t ADT: 7,551

I 90

Fair

Over: CLARK FORK RIVER

10.5M E SUPERIOR, Mineral, MT

Built 1967 Load: 28.1 t ADT: 3,776

I 90

Fair

Over: RR

1.9M W CLINTON, Missoula, MT

Built 1963 Load: 28.1 t ADT: 5,554

RIVERVIEW DR

Fair

Over: CLEARWATER RIVER 084

1M W SEELEY LAKE, Missoula, MT

Built 1967 Load: 28.1 t ADT: 100

GOULDING CREEK RD

Fair

Over: HARPER`S COULEE

11M SW ROUNDUP, Musselshell, MT

Built 1954 Load: 28.1 t ADT: 136

SHIELDS RIVER RD

Fair

Over: SHIELDS RIVER 011

14M NE WILSALL, Park, MT

Built 1957 Load: 28.1 t ADT: 100

US 89

Fair

Over: SHIELDS RIVER

4M SE CLYDE PARK, Park, MT

Built 1984 Load: 28.1 t ADT: 1,430

US 191

Fair

Over: COTTONWOOD CREEK

15M NE MALTA, Phillips, MT

Built 1998 Load: 28.1 t ADT: 211

S 243

Fair

Over: DRAINAGE

1M N SACO, Phillips, MT

Built 1936 Load: 28.1 t ADT: 252

S 366-LEDGER RD

Fair

Over: DRAINAGE

4M W LEDGER, Pondera, MT

Built 1954 Load: 28.1 t ADT: 186

I 90

Fair

Over: LITTLE BLACKFOOT RIVER

1.2M S GARRISON, Powell, MT

Built 1979 Load: 28.1 t ADT: 5,165

RIVER JUNCTION/ SC

Fair

Over: BLACKFOOT RIVER 004

6M W OVANDO, Powell, MT

Built 1994 Load: 28.1 t ADT: 100

OLD HWY 10 W

Fair

Over: WILLIAMS COULEE 007

13M SW TERRY, Prairie, MT

Built 1930 Load: 28.1 t ADT: 504

CB ROUTE RD

Fair

Over: BR MAIN CANAL 037

4M NE FALLON, Prairie, MT

Built 1966 Load: 28.1 t ADT: 80

S 253

Fair

Over: DRAINAGE

17M NW TERRY, Prairie, MT

Built 1940 Load: 28.1 t ADT: 366

US 93 FH 19

Fair

Over: RYE CREEK

5M SE DARBY, Ravalli, MT

Built 1990 Load: 28.1 t ADT: 1,069

BELL CROSSING

Fair

Over: BITTERROOT RIVER

2M NE VICTOR, Ravalli, MT

Built 1974 Load: 28.1 t ADT: 2,762

W MAIN ST

Fair

Over: BITTERROOT RIVER

W HAMILTON, Ravalli, MT

Built 1968 Load: 28.1 t ADT: 2,730

COUNTY ROAD 329

Fair

Over: USBR MAIN CANAL 057

3M N SAVAGE, Richland, MT

Built 1996 Load: 28.1 t ADT: 42

S 16

Fair

Over: FOX CREEK

5M SW SIDNEY, Richland, MT

Built 1974 Load: 28.1 t ADT: 2,766

HAMMOND VALLEY RD

Fair

Over: GREASEWOOD CREEK 033

7M NW FORSYTH, Rosebud, MT

Built 1979 Load: 28.1 t ADT: 65

IRR - S 39

Fair

Over: RR-POWER PLANT ROAD

SOUTH EDGE COLSTRIP, Rosebud, MT

Built 1981 Load: 28.1 t ADT: 1,243

LIL BITTERROOT RD

Fair

Over: LITTLE BITTERROOT 074

12M W RONAN, Sanders, MT

Built 1986 Load: 28.1 t ADT: 100

IRR - S 28

Fair

Over: LITTLE BITTERROOT RIVER

1M N LONEPINE, Sanders, MT

Built 2010 Load: 28.1 t ADT: 1,842

S 16

Fair

Over: MEDICINE LAKE

1M S MEDICINE LAKE, Sheridan, MT

Built 1975 Load: 28.1 t ADT: 846

S 5

Fair

Over: DRY CREEK

8M SW WESTBY, Sheridan, MT

Built 1939 Load: 28.1 t ADT: 307

13TH LN NE

Fair

Over: TETON RIVER 099

5M N DUTTON, Teton, MT

Built 1965 Load: 28.1 t ADT: 100

I 15

Fair

Over: MARIAS RIVER

6M S SHELBY, Toole, MT

Built 1976 Load: 28.1 t ADT: 1,294

I 15

Fair

Over: MARIAS RIVER

6M S SHELBY, Toole, MT

Built 1976 Load: 28.1 t ADT: 1,294

OLD HWY 10

Fair

Over: IRRIGATION DITCH 024

10M E HYSHAM, Treasure, MT

Built 1933 Load: 28.1 t ADT: 271

ROCK CREEK RD

Fair

Over: WILLOW CREEK 030

14M N HINSDALE, Valley, MT

Built 2000 Load: 28.1 t ADT: 100

US 191

Fair

Over: AMERICAN FORK

10M S HARLOWTON, Wheatland, MT

Built 1942 Load: 28.1 t ADT: 702

W M RD

Fair

Over: ARROW CREEK 099

3M NE WORDEN, Yellowstone, MT

Built 1975 Load: 28.1 t ADT: 216

ALKALI CREEK RD

Fair

Over: ALKALI CREEK 034

2M NW BILLINGS, Yellowstone, MT

Built 1989 Load: 28.1 t ADT: 989

OLD HWY 312

Fair

Over: CUSTER COULEE 171

2M E HUNTLEY, Yellowstone, MT

Built 1928 Load: 28.1 t ADT: 2,758

GOLF COURSE RD

Fair

Over: BIG DITCH 029

2M W LAUREL, Yellowstone, MT

Built 1968 Load: 28.1 t ADT: 1,267

US 87

Fair

Over: RR

BILLINGS, Yellowstone, MT

Built 1993 Load: 28.1 t ADT: 23,275

S FRONTAGE RD

Fair

Over: CANYON CREEK

W BILLINGS, Yellowstone, MT

Built 1959 Load: 28.1 t ADT: 4,386

Showing 2,001-2,050 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.