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

SWAN RIVER RD

Fair

Over: SWAN RIVER 008

1M W FERNDALE, Flathead, MT

Built 1998 Load: 31.8 t ADT: 100

SPRING CREEK DR

Fair

Over: SPRING CREEK 095

1M NE KALISPELL, Flathead, MT

Built 1994 Load: 31.8 t ADT: 1,725

US 93

Fair

Over: ASHLEY CREEK

S OF KALISPELL, Flathead, MT

Built 2001 Load: 31.8 t ADT: 17,385

US 287

Fair

Over: GRAYLING CREEK

10M NW WEST YELLOWSTONE, Gallatin, MT

Built 1964 Load: 31.8 t ADT: 1,059

DRY CREEK RD

Fair

Over: E GALLATIN RIVER OVERFLO

4M N BELGRADE, Gallatin, MT

Built 1957 Load: 31.8 t ADT: 2,093

US 12

Fair

Over: TWIN COULEE

1M E LAVINA, Golden Valley, MT

Built 1935 Load: 31.8 t ADT: 459

COUNTY ROAD 061

Fair

Over: LITTLE PRICKLY PEAR 111

1M N SIEBEN INT, Lewis and Clark, MT

Built 1962 Load: 31.8 t ADT: 13

S 21

Fair

Over: DRY CREEK 122

12M W SIMMS, Lewis and Clark, MT

Built 1935 Load: 31.8 t ADT: 258

NO DATA ENTERED

Fair

Over: COAL CR

COAL CR, Madison, MT

Built 1950 Load: 31.8 t ADT: 40

S 287

Fair

Over: WATER GULCH

4M NW VIRGINIA CITY, Madison, MT

Built 1942 Load: 31.8 t ADT: 1,151

S 528

Fair

Over: SAND CREEK 022

5M SW WOLF POINT, McCone, MT

Built 1974 Load: 31.8 t ADT: 76

S 13

Fair

Over: S FORK BUFFALO CREEK

8M NE CIRCLE, McCone, MT

Built 1988 Load: 31.8 t ADT: 787

I 90 EB

Fair

Over: ST. REGIS RIVER

5.6M E DE BORGIA, Mineral, MT

Built 1980 Load: 31.8 t ADT: 3,676

MORMON PK RD

Fair

Over: LOLO CR

MORMON PK, Missoula, MT

Built 1958 Load: 31.8 t ADT: 50

PLACID LAKE RD S

Fair

Over: OWL CREEK 086

4M S SEELEY LAKE, Missoula, MT

Built 1973 Load: 31.8 t ADT: 100

GLACIER CREEK RD

Fair

Over: SWAN RIVER 058

W CONDON, Missoula, MT

Built 2003 Load: 31.8 t ADT: 100

US 12-E BROADWAY S

Fair

Over: RATTLESNAKE CREEK

MISSOULA-E BROADWAY ST, Missoula, MT

Built 1964 Load: 31.8 t ADT: 23,299

N RESERVE ST

Fair

Over: CLARK FORK R FLOOD PLAIN

MISSOULA-N RESERVE ST, Missoula, MT

Built 1977 Load: 31.8 t ADT: 36,321

DAISY DEAN RD

Fair

Over: SHIELDS RIVER 019

2M NE WILSALL, Park, MT

Built 1984 Load: 31.8 t ADT: 100

FIDDLE CREEK RD

Fair

Over: SHIELDS RIVER 035

6M SE CLYDE PARK, Park, MT

Built 2001 Load: 31.8 t ADT: 100

CONTENT RD

Fair

Over: SAGE CREEK 054

39M S MALTA, Phillips, MT

Built 1986 Load: 31.8 t ADT: 100

IRR - US 2

Fair

Over: DODSON SOUTH CANAL

2M W DODSON, Phillips, MT

Built 1972 Load: 31.8 t ADT: 1,190

IRR - US 2

Fair

Over: MILK RIVER

2M W DODSON, Phillips, MT

Built 1972 Load: 31.8 t ADT: 1,190

S 21

Fair

Over: IRRIGATION CANAL

1M S CONRAD, Pondera, MT

Built 1988 Load: 31.8 t ADT: 702

US 212

Fair

Over: LITTLE POWDER RIVER

7M SE BROADUS, Powder River, MT

Built 1976 Load: 31.8 t ADT: 2,463

N.FK BLACKFT RD

Fair

Over: N FK BLACKFOOT RIV

NO DATA ENTERED, Powell, MT

Built 1960 Load: 31.8 t ADT: 40

S 253

Fair

Over: CEDAR CREEK

9M NW TERRY, Prairie, MT

Built 1935 Load: 31.8 t ADT: 402

US 93 FH 19

Fair

Over: BITTERROOT RIVER

4M SE DARBY, Ravalli, MT

Built 1986 Load: 31.8 t ADT: 1,069

5TH ST SW

Fair

Over: USBR MAIN CANAL 082

SIDNEY-5TH ST, Richland, MT

Built 1999 Load: 31.8 t ADT: 860

IRRCOUNTY ROAD 208

Fair

Over: POPLAR RIVER 039

17M N POPLAR, Roosevelt, MT

Built 1964 Load: 31.8 t ADT: 100

S 59

Fair

Over: DRY HOUSE CREEK

25 M NW MILES CITY, Rosebud, MT

Built 2007 Load: 31.8 t ADT: 1,250

MARTEN CREEK RD

Fair

Over: TROUT CREEK 054

1M W TROUT CREEK, Sanders, MT

Built 2010 Load: 31.8 t ADT: 170

S 78

Fair

Over: SHANE CREEK

3M S COLUMBUS, Stillwater, MT

Built 2007 Load: 31.8 t ADT: 2,305

IRR - S 24

Fair

Over: WEST FK PORCUPINE CREEK

18M S OPHEIM, Valley, MT

Built 1940 Load: 31.8 t ADT: 290

IRR - S 24

Fair

Over: ALKALI CREEK

10M S OPHEIM, Valley, MT

Built 1935 Load: 31.8 t ADT: 199

SHANNON RD

Fair

Over: CANYON CREEK DITCH 061

3M NE LAUREL, Yellowstone, MT

Built 1984 Load: 31.8 t ADT: 1,800

DANFORD RD

Fair

Over: CANYON CREEK DITCH 108

5M SW BILLINGS, Yellowstone, MT

Built 1938 Load: 31.8 t ADT: 1,146

TREWIN SCHOOL RD

Fair

Over: BIG DITCH 066

5M W LAUREL, Yellowstone, MT

Built 1985 Load: 31.8 t ADT: 100

SHEPHERD ACTON RD

Fair

Over: BBWA CANAL 086

4M W SHEPHERD, Yellowstone, MT

Built 1984 Load: 31.8 t ADT: 100

S BILLINGS BLVD

Fair

Over: YELLOWSTONE RIVER

1M S BILLINGS, Yellowstone, MT

Built 1972 Load: 31.8 t ADT: 9,171

BUNDY RD

Fair

Over: YELLOWSTONE RIVER

3M NW POMPEY`S PILLAR, Yellowstone, MT

Built 2001 Load: 31.8 t ADT: 86

S 278

Fair

Over: DRAINAGE

JACKSON, Beaverhead, MT

Built 1970 Load: 31.9 t ADT: 389

5TH LN

Fair

Over: GREENFIELD S CANAL 045

5M E FAIRFIELD, Cascade, MT

Built 2003 Load: 31.9 t ADT: 100

FOREST ROAD

Fair

Over: GRIFFIN CREEK

MUSKRAT ROAD, Flathead, MT

Built 1970 Load: 32.1 t ADT: 30

ENYART LN

Fair

Over: COTTONWOOD CREEK 026

6M NE CLYDE PARK, Park, MT

Built 1970 Load: 32.1 t ADT: 100

N.FK BLACKFT RD

Fair

Over: LAKE CR

COPPER BLACKFOOT, Powell, MT

Built 1964 Load: 32.1 t ADT: 40

FOX FARM RD

Fair

Over: DRAINAGE 009

10M E GLASGOW, Valley, MT

Built 1930 Load: 32.1 t ADT: 100

IRR BIA RTE 91

Fair

Over: BIG HORN RIVER

2.4 KM WEST OF ST. XAVIER, Big Horn, MT

Built 1970 Load: 32.4 t ADT: 360

PEOPLE CR RD

Fair

Over: PEOPLE`S CREEK 106

5M SW CLEVELAND, Blaine, MT

Built 1971 Load: 32.4 t ADT: 47

MORMON AVE

Fair

Over: RUSSELL CREEK 035

EKALAKA-MORMON AVE, Carter, MT

Built 1940 Load: 32.4 t ADT: 477

Showing 2,351-2,400 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.