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

US 287

Good

Over: HOT SPRINGS CREEK

NORRIS, Madison, MT

Built 1997 Load: 32.7 t ADT: 3,827

I 90

Good

Over: CEDAR CREEK

1.2M E SUPERIOR, Mineral, MT

Built 1960 Load: 32.7 t ADT: 3,776

I 90

Good

Over: GRANT CREEK

RESERVE ST INT MISSOULA, Missoula, MT

Built 1965 Load: 32.7 t ADT: 22,894

I 90

Good

Over: ABANDONED RAILROAD

0.6M E BONNER, Missoula, MT

Built 1964 Load: 32.7 t ADT: 6,035

I 90 WB

Good

Over: ABANDONED RAILROAD

0.6M E BONNER, Missoula, MT

Built 1964 Load: 32.7 t ADT: 6,035

DEEP CREEK RD

Good

Over: DEEP CREEK 098

6M S FRENCHTOWN, Missoula, MT

Built 1983 Load: 32.7 t ADT: 3,077

BLUE MOUNTAIN ROAD

Good

Over: O`BRIEN CREEK 114

W OF MISSOULA, Missoula, MT

Built 1998 Load: 32.7 t ADT: 2,179

CARLTON CREEK RD

Good

Over: SIN-TIN-TIN-EM-SKA 102

6M S LOLO, Missoula, MT

Built 1985 Load: 32.7 t ADT: 396

MILL CREEK RD

Good

Over: LOLO CREEK 110

7M W LOLO, Missoula, MT

Built 1983 Load: 32.7 t ADT: 100

OLD GRANT CR RD

Good

Over: GRANT CREEK 112

6M N MISSOULA, Missoula, MT

Built 1979 Load: 32.7 t ADT: 100

WHITETAIL DR

Good

Over: MORRELL CREEK 007

0.5M S SEELEY LAKE, Missoula, MT

Built 1994 Load: 32.7 t ADT: 100

LINDBERGH RD

Good

Over: SWAN RIVER 065

19M N SEELEY LAKE, Missoula, MT

Built 1984 Load: 32.7 t ADT: 100

PROSPECT DR

Good

Over: GRANT CREEK 001

MISSOULA-PROSPECT DR, Missoula, MT

Built 1981 Load: 32.7 t ADT: 100

VINE ST

Good

Over: RATTLESNAKE CREEK 002

MISSOULA-VINE ST, Missoula, MT

Built 1945 Load: 32.7 t ADT: 2,144

ROCK CREEK RD N

Good

Over: ROCK CREEK 029

9M E CLYDE PARK, Park, MT

Built 2015 Load: 32.7 t ADT: 100

FRONTAGE RD E 448

Good

Over: MISSION CREEK 002

8M NE LIVINGSTON, Park, MT

Built 1987 Load: 32.7 t ADT: 99

S YELLOWSTONE ST

Good

Over: FLESHMAN CREEK 071

LIVINGSTON-SACAGAWEA PARK, Park, MT

Built 1939 Load: 32.7 t ADT: 100

WILDHORSE RD

Good

Over: BOX ELDER CREEK 012

13M NW WINNETT, Petroleum, MT

Built 1978 Load: 32.7 t ADT: 100

ROAD 101

Good

Over: DUVAL COULEE

SECT 34 T22N R24E, Phillips, MT

Built 2006 Load: 32.7 t ADT: 200

AUTO TOUR ROAD

Good

Over: CNL BETW BOWDOIN/DRY LK

SECT 1 E OF BOWDOIN LAKE, Phillips, MT

Built 1973 Load: 32.7 t ADT: 20

DRY FORK RD

Good

Over: SPRING CREEK 050

4M N CONRAD, Pondera, MT

Built 1987 Load: 32.7 t ADT: 54

DRY FORK RD

Good

Over: IRRIGATION CANAL 085

3M N CONRAD, Pondera, MT

Built 2013 Load: 32.7 t ADT: 54

S 21-S MAIN ST

Good

Over: PONDERA COULEE

CONRAD BY FLEET SUPPLY, Pondera, MT

Built 1934 Load: 32.7 t ADT: 1,238

CROSS S RD

Good

Over: MIZPAH CREEK 020

12M NE COALWOOD, Powder River, MT

Built 2013 Load: 32.7 t ADT: 100

LOWER GAME RANGE R

Good

Over: COTTONWOOD CREEK 054

7M W OVANDO, Powell, MT

Built 1978 Load: 32.7 t ADT: 100

RED CROW RD

Good

Over: FRED BURR CREEK 039

5M SW VICTOR, Ravalli, MT

Built 1972 Load: 32.7 t ADT: 100

RED CROW RD

Good

Over: SOUTH BEAR CREEK 111

3M SW VICTOR, Ravalli, MT

Built 2009 Load: 32.7 t ADT: 100

FISH HATCHERY RD

Good

Over: SKALKAHO CREEK 042

2M SE GRANTSDALE, Ravalli, MT

Built 2009 Load: 32.7 t ADT: 100

S SUNSET BENCH RD

Good

Over: IRRIGATION CANAL 018

7M NE VICTOR, Ravalli, MT

Built 1970 Load: 32.7 t ADT: 100

SLEEPING CHILD RD

Good

Over: SLEEPING CHILD CREEK 073

9M NE DARBY, Ravalli, MT

Built 1972 Load: 32.7 t ADT: 347

US 93

Good

Over: BIG CREEK

2M N VICTOR, Ravalli, MT

Built 2010 Load: 32.7 t ADT: 12,937

EASTSIDE HWY

Good

Over: IRRIGATION CANAL

3M N CORVALLIS, Ravalli, MT

Built 1997 Load: 32.7 t ADT: 3,586

COUNTY ROAD 211

Good

Over: SECOND HAY CREEK 065

4M SW FAIRVIEW, Richland, MT

Built 2018 Load: 32.7 t ADT: 100

COUNTY ROAD 012

Good

Over: WEST CHARLIE CREEK 085

47M NW FAIRVIEW, Richland, MT

Built 1993 Load: 32.7 t ADT: 100

COUNTY ROAD 037

Good

Over: DRAINAGE 032

8M NE LAMBERT, Richland, MT

Built 1992 Load: 32.7 t ADT: 100

COUNTY ROAD 131

Good

Over: USBR MAIN CANAL 080

3M SW FAIRVIEW, Richland, MT

Built 1998 Load: 32.7 t ADT: 100

COUNTY ROAD 326

Good

Over: FOX CREEK 009

5M SW SIDNEY, Richland, MT

Built 1994 Load: 32.7 t ADT: 69

COUNTY ROAD 502

Good

Over: CRANE CREEK 007

12M W CRANE, Richland, MT

Built 2000 Load: 32.7 t ADT: 100

IRR - S 480

Good

Over: LONG GRASS CREEK

20M N RICHEY, Richland, MT

Built 1984 Load: 32.7 t ADT: 22

COUNTY ROAD 249

Good

Over: SHEEP CREEK 061

4M NW FROID, Roosevelt, MT

Built 1999 Load: 32.7 t ADT: 100

THREE CORNERS RD

Good

Over: SMOKE CREEK 024

30M N POPLAR, Roosevelt, MT

Built 2016 Load: 32.7 t ADT: 100

IRR BIA RTE 4

Good

Over: BIRNEY CREEK

2.9 KM NW OF BIRNEY, Rosebud, MT

Built 2007 Load: 32.7 t ADT: 250

IRR BIA RTE 204

Good

Over: ROSEBUD CREEK

4.8 KM NW OF LAME DEER, Rosebud, MT

Built 1971 Load: 32.7 t ADT: 60

PINE BUTTE DRIVE

Good

Over: ARMELLS CREEK 077

2M N COLSTRIP, Rosebud, MT

Built 1981 Load: 32.7 t ADT: 505

ELK CREEK RD

Good

Over: ELK CREEK 050

4M S HERON, Sanders, MT

Built 2001 Load: 32.7 t ADT: 100

LOWER RIVER RD

Good

Over: ELK CREEK 100

1M E HERON, Sanders, MT

Built 1976 Load: 32.7 t ADT: 65

KLAKKEN RD

Good

Over: PILGRIM CREEK 053

E NOXON, Sanders, MT

Built 1972 Load: 32.7 t ADT: 170

WINCHESTER RD

Good

Over: ELK CREEK 057

2M S HERON, Sanders, MT

Built 1992 Load: 32.7 t ADT: 100

WILKES CREEK ROAD

Good

Over: PROSPECT CREEK 006

3M SW THOMPSON FALLS, Sanders, MT

Built 1978 Load: 32.7 t ADT: 100

THOMPSON R PASS RD

Good

Over: THOMPSON RIVER 062

23M N PLAINS, Sanders, MT

Built 1976 Load: 32.7 t ADT: 40

Showing 4,151-4,200 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.