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 551

Good

Over: ARROW CREEK

3M N GEYSER, Judith Basin, MT

Built 2010 Load: 40.5 t ADT: 83

AUGUSTA RD

Good

Over: MIDDLE FORK DEARBORN 010

25M S AUGUSTA, Lewis and Clark, MT

Built 2014 Load: 40.5 t ADT: 46

4445 KOOTENAI MTN

Good

Over: OBRIEN CREEK

.2 MILES FROM JCT W/331, Lincoln, MT

Built 1966 Load: 40.5 t ADT: 20

CLEVELAND RD

Good

Over: THREE MILE CREEK

2M S CHINOOK, Blaine, MT

Built 2014 Load: 40.8 t ADT: 849

US 287

Good

Over: MISSOURI RIVER

TOSTON, Broadwater, MT

Built 2020 Load: 40.8 t ADT: 4,885

LARSON LOOP RD

Good

Over: BOX ELDER CREEK

30 M S EKALAKA, Carter, MT

Built 2019 Load: 40.8 t ADT: 100

OLD SCOBEY RD

Good

Over: POPLAR RIVER

2M SW SCOBEY, Daniels, MT

Built 2021 Load: 40.8 t ADT: 100

S 248

Good

Over: DRAINAGE

2M W SCOBEY, Daniels, MT

Built 2007 Load: 40.8 t ADT: 390

MICKS DR

Good

Over: ROSS FORK CREEK

4M NW SIPPLE, Judith Basin, MT

Built 2021 Load: 40.8 t ADT: 112

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

3M N ST IGNATIUS, Lake, MT

Built 2006 Load: 40.8 t ADT: 7,419

US 12

Good

Over: RR

3M E HELENA, Lewis and Clark, MT

Built 1978 Load: 40.8 t ADT: 18,929

S 508 FH 62

Good

Over: RED TOP CREEK

13M SW YAAK, Lincoln, MT

Built 1994 Load: 40.8 t ADT: 255

US 89

Good

Over: DRY FORK MARIAS RIVER

3M SE DUPUYER, Pondera, MT

Built 2006 Load: 40.8 t ADT: 485

EASTSIDE HWY

Good

Over: ETNA DITCH

8M S STEVENSVILLE, Ravalli, MT

Built 1997 Load: 40.8 t ADT: 3,586

IRR BIA RTE 40

Good

Over: POPLAR RIVER

10 KM N OF PRYOR, Roosevelt, MT

Built 2000 Load: 40.8 t ADT: 200

I 90

Good

Over: BERRY CREEK

7.4M E REED POINT, Stillwater, MT

Built 1971 Load: 40.8 t ADT: 5,353

US 2

Good

Over: PORCUPINE CREEK OVERFLOW

1M E NASHUA, Valley, MT

Built 2006 Load: 40.8 t ADT: 1,504

LUMP GULCH ROAD

Good

Over: PRICKLY PEAR CREEK 074

1M N CLANCY, Jefferson, MT

Built 2007 Load: 41.2 t ADT: 100

LARB CREEK RD

Good

Over: BEAVER CREEK

S SACO, Phillips, MT

Built 2023 Load: 41.5 t ADT: 51

US 2

Good

Over: RED ROCK COULEE

1M W CHINOOK, Blaine, MT

Built 2020 Load: 41.7 t ADT: 2,637

US 12

Good

Over: DEEP CREEK

14M E TOWNSEND, Broadwater, MT

Built 2015 Load: 41.7 t ADT: 707

S 19

Good

Over: CHIPPEWA CREEK

3M N GRASS RANGE, Fergus, MT

Built 1962 Load: 41.7 t ADT: 586

NORTH FORK RD

Good

Over: HAY CREEK 054

1M S POLEBRIDGE, Flathead, MT

Built 1979 Load: 41.7 t ADT: 394

NIXON GULCH ROAD

Good

Over: GALLATIN RIVER

2M NE MANHATTAN, Gallatin, MT

Built 2020 Load: 41.7 t ADT: 100

I 90 EASTBOUND

Good

Over: BOULDER RIVER

0.6M E CARDWELL, Jefferson, MT

Built 1968 Load: 41.7 t ADT: 5,527

MICHAEL RD

Good

Over: PABLO FEEDER CANAL 024

3M NE RONAN, Lake, MT

Built 2014 Load: 41.7 t ADT: 100

US 93

Good

Over: WILDLIFE UNDERPASS

S OF RAVALLI, Lake, MT

Built 2006 Load: 41.7 t ADT: 8,330

LYONS CREEK RD

Good

Over: LYONS CREEK 157

5M S WOLF CREEK, Lewis and Clark, MT

Built 1990 Load: 41.7 t ADT: 100

WILLIAMS AVE

Good

Over: TEN MILE CREEK 003

1M W HELENA, Lewis and Clark, MT

Built 2010 Load: 41.7 t ADT: 3,050

CANYON FERRY RD

Good

Over: HELENA VALLEY CANAL

9M NE EAST HELENA, Lewis and Clark, MT

Built 2010 Load: 41.7 t ADT: 1,580

US 2

Good

Over: SWAMP CREEK

22 MILES NORTHWEST OF HAP, Lincoln, MT

Built 2018 Load: 41.7 t ADT: 1,597

I 15

Good

Over: PONDERA COULEE

1M S CONRAD, Pondera, MT

Built 1972 Load: 41.7 t ADT: 1,461

I 15

Good

Over: PONDERA COULEE

1M S CONRAD, Pondera, MT

Built 1972 Load: 41.7 t ADT: 1,461

CABIN CREEK RD

Good

Over: CABIN CREEK

19M SE FALLON, Prairie, MT

Built 1988 Load: 41.7 t ADT: 27

OLD HWY 312

Good

Over: FIVE MILE CREEK 183

3M NE BILLINGS, Yellowstone, MT

Built 2005 Load: 41.7 t ADT: 11,193

CABLE MTN CAMPGROU

Good

Over: N FK FLINT CREEK

NO DATA ENTERED, Granite, MT

Built 2015 Load: 41.8 t ADT: 40

RD 535

Good

Over: PL. VALLEY FISHER RIVER

SW END OF LOON LAKE, Lincoln, MT

Built 1982 Load: 41.8 t ADT: 40

WOLVERENE CR ROAD

Good

Over: WIGWAM CR

WIGWAM CR, Lincoln, MT

Built 1981 Load: 42.4 t ADT: 50

US 12

Good

Over: DEEP CREEK

14M E TOWNSEND, Broadwater, MT

Built 2015 Load: 42.6 t ADT: 707

US 212 FH 59

Good

Over: WEST FORK ROCK CREEK

1M S RED LODGE, Carbon, MT

Built 1980 Load: 42.6 t ADT: 1,068

S 19

Good

Over: LITTLE BOX ELDER CREEK

9M N GRASS RANGE, Fergus, MT

Built 1962 Load: 42.6 t ADT: 586

I 90

Good

Over: JEFFERSON RIVER

0.6M W THREE FORKS, Gallatin, MT

Built 1968 Load: 42.6 t ADT: 8,465

I 15

Good

Over: BOULDER RIVER

4.3M S BASIN, Jefferson, MT

Built 1985 Load: 42.6 t ADT: 1,571

HOWLETT ROAD

Good

Over: CROW CREEK

3 M SW RONAN, Lake, MT

Built 2021 Load: 42.6 t ADT: 100

US 93

Good

Over: WILDLIFE UNDERPASS

1M SE POLSON, Lake, MT

Built 2006 Load: 42.6 t ADT: 7,781

BLACK BEAR RD

Good

Over: TROUT CREEK 141

YORK, Lewis and Clark, MT

Built 2000 Load: 42.6 t ADT: 100

SILVERBOW LANE

Good

Over: BEAVERHEAD RIVER

8 M W SHERIDAN, Madison, MT

Built 2020 Load: 42.6 t ADT: 35

US 287

Good

Over: MADISON RIVER OVERFLOW

SE ENNIS, Madison, MT

Built 2001 Load: 42.6 t ADT: 4,210

PETTY CREEK RD

Good

Over: PETTY CREEK 038

5M S ALBERTON, Missoula, MT

Built 1990 Load: 42.6 t ADT: 388

US 93

Good

Over: WILDLIFE UNDERPASS

11M N WYE INT, Missoula, MT

Built 2009 Load: 42.6 t ADT: 8,184

Showing 4,551-4,600 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.