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

FOX FARM RD

Fair

Over: HAY COULEE 006

7M E GLASGOW, Valley, MT

Built 1930 Load: 22.7 t ADT: 100

AITKEN RD

Fair

Over: CHERRY CREEK 080

SW EDGE GLASGOW, Valley, MT

Built 1938 Load: 22.7 t ADT: 100

US 2

Fair

Over: BUGGY CREEK

12M NW GLASGOW, Valley, MT

Built 1948 Load: 22.7 t ADT: 1,148

IRR - S 24

Fair

Over: DRY FORK CREEK

25M SW OPHEIM, Valley, MT

Built 1948 Load: 22.7 t ADT: 290

W I RD

Fair

Over: CUSTER COULEE 098

6M NE HUNTLEY, Yellowstone, MT

Built 1962 Load: 22.7 t ADT: 100

CUSTER FRTG RD

Fair

Over: SAND COULEE 003

1M E POMPEYS PILLAR, Yellowstone, MT

Built 1940 Load: 22.7 t ADT: 146

CUSTER FRTG RD

Fair

Over: MILL CREEK 018

4M E POMPEY`S PILLAR, Yellowstone, MT

Built 1940 Load: 22.7 t ADT: 146

CUSTER FRTG RD

Fair

Over: BULL MOUNTAIN CREEK 019

5M NE POMPEY`S PILLAR, Yellowstone, MT

Built 1940 Load: 22.7 t ADT: 146

US 212

Fair

Over: RR

2M NE LAUREL, Yellowstone, MT

Built 1936 Load: 22.7 t ADT: 5,491

MUSSELSHELL TRL RD

Fair

Over: YELLOWSTONE RIVER

1M N CUSTER, Yellowstone, MT

Built 1964 Load: 22.7 t ADT: 216

HWY 312

Fair

Over: RR

1M W POMPEY`S PILLAR, Yellowstone, MT

Built 2004 Load: 22.7 t ADT: 399

FDR 1203

Fair

Over: JOHNSON CR

JOHNSON CR, Beaverhead, MT

Built 1968 Load: 23.0 t ADT: 25

CROW CREEK ROAD

Fair

Over: CROW CREEK

CROW CREEK 2, Broadwater, MT

Built 1967 Load: 23.0 t ADT: 50

GRAVES CREEK ROAD

Fair

Over: THOMA CREEK

5.6 MI WEST NORTH FORK RD, Flathead, MT

Built 1964 Load: 23.0 t ADT: 10

SPIRE ROCK CG LOOP

Fair

Over: STORMCASTLE CREEK

SPIRE ROCK CAMPGROUND, Gallatin, MT

Built 1957 Load: 23.0 t ADT: 50

SPIRE ROCK CG LOOP

Fair

Over: STORMCASTLE CREEK

SPIRE ROCK CAMPGROUND, Gallatin, MT

Built 1957 Load: 23.0 t ADT: 50

CLEAR CREEK RD SE

Fair

Over: LITTLE BOX ELDER CR 033

11M SE HAVRE, Hill, MT

Built 1974 Load: 23.0 t ADT: 139

E 1ST STREET

Fair

Over: WHITETAIL CREEK 023

WHITEHALL-E 1ST ST, Jefferson, MT

Built 1984 Load: 23.0 t ADT: 100

473 KEELER/RATTLE

Fair

Over: WEST FORK KEELER CREEK

WEST FORK KEELER CREEK, Lincoln, MT

Built 1957 Load: 23.0 t ADT: 50

RD 231

Fair

Over: W FISHER RIVER

1 MI E LAKE CR CAMPGROUND, Lincoln, MT

Built 1982 Load: 23.0 t ADT: 50

RD 763

Fair

Over: WOLF CR

.2 MI S WOLF CR JCT, Lincoln, MT

Built 1978 Load: 23.0 t ADT: 40

NO DATA ENTERED

Fair

Over: LAKE FORK ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 1952 Load: 23.3 t ADT: 50

NO DATA ENTERED

Fair

Over: W FK FISHTRAP

W FK FISHTRAP, Deer Lodge, MT

Built 1973 Load: 23.3 t ADT: 20

GALENA GULCH ROAD

Fair

Over: BOULDER RIVER

I15 HIGH ORE EXIT, Jefferson, MT

Built 1957 Load: 23.3 t ADT: 50

NO DATA ENTERED

Fair

Over: SILVER CREEK

SILVER CR, Mineral, MT

Built 1984 Load: 23.3 t ADT: 50

RD 810

Fair

Over: ST REGIS RIVER

DOMINION CR, Mineral, MT

Built 1957 Load: 23.3 t ADT: 50

ARLENE RD

Fair

Over: CLARK FORK 105

24M SE MISSOULA, Missoula, MT

Built 1976 Load: 23.3 t ADT: 161

IRRCOUNTY ROAD 221

Fair

Over: SMOKE CREEK 025

22M N BROCKTON, Roosevelt, MT

Built 2004 Load: 23.4 t ADT: 100

OLD US 10

Fair

Over: COVE DITCH 012

2M NE PARK CITY, Stillwater, MT

Built 1928 Load: 23.5 t ADT: 726

UPPER N HILL RD

Fair

Over: EAST FK ROBERTS CR 006

12M SE JUDITH GAP, Wheatland, MT

Built 1962 Load: 23.5 t ADT: 19

HESPER RD

Fair

Over: BBWA CANAL 117

3M SW BILLINGS, Yellowstone, MT

Built 1938 Load: 23.5 t ADT: 4,877

S 41

Fair

Over: STONE CREEK

9M NE DILLON, Beaverhead, MT

Built 1949 Load: 23.6 t ADT: 2,326

IRR - I 90

Fair

Over: LITTLE BIGHORN RIVER

2.5M S CROW AGENCY, Big Horn, MT

Built 1956 Load: 23.6 t ADT: 2,439

IRR - S 314

Fair

Over: ROSEBUD CREEK

11M SW BUSBY, Big Horn, MT

Built 1983 Load: 23.6 t ADT: 386

SARPY CREEK RD

Fair

Over: LITTLE BIGHORN RIVER

3M E HARDIN, Big Horn, MT

Built 1962 Load: 23.6 t ADT: 511

US 2

Fair

Over: DRAINAGE

3M E CHINOOK, Blaine, MT

Built 1940 Load: 23.6 t ADT: 2,067

IRR - S 66

Fair

Over: SOUTH FORK PEOPLES CREEK

12M NW HAYS, Blaine, MT

Built 1959 Load: 23.6 t ADT: 971

CENTRAL AVE

Fair

Over: RUSSELL CREEK 001

EKALAKA-CENTRAL AVE, Carter, MT

Built 1938 Load: 23.6 t ADT: 100

S 7

Fair

Over: FLASTED DRAW

5M NE EKALAKA, Carter, MT

Built 1940 Load: 23.6 t ADT: 390

S 7

Fair

Over: SHEEP CAMP CREEK

11M NE EKALAKA, Carter, MT

Built 1941 Load: 23.6 t ADT: 390

RIVER RD

Fair

Over: BIRD CREEK 036

5M NE CASCADE, Cascade, MT

Built 1940 Load: 23.6 t ADT: 100

OLD ULM CASCADE RD

Fair

Over: LITTLE MUDDY CREEK 067

7M NE CASCADE, Cascade, MT

Built 1987 Load: 23.6 t ADT: 100

OLD US 91

Fair

Over: PREWETT CREEK 070

10M S CASCADE, Cascade, MT

Built 1931 Load: 23.6 t ADT: 314

S 332

Fair

Over: PUMPKIN CREEK

12M S MILES CITY, Custer, MT

Built 1959 Load: 23.6 t ADT: 198

VALENTINE RD

Fair

Over: BLOOD CREEK 132

25M N WINNETT, Fergus, MT

Built 1986 Load: 23.6 t ADT: 100

LWR COTTONWOOD CR

Fair

Over: COTTONWOOD CREEK 034

8M W LEWISTOWN, Fergus, MT

Built 2009 Load: 23.6 t ADT: 26

US 191-KENDALL RD

Fair

Over: BIG SPRING CREEK

LEWISTOWN-KENDALL RD, Fergus, MT

Built 1976 Load: 23.6 t ADT: 3,046

US 87

Fair

Over: BOYD CREEK

3M E LEWISTOWN, Fergus, MT

Built 1942 Load: 23.6 t ADT: 1,477

DELREY RD

Fair

Over: SWIFT CREEK 072

7M NW WHITEFISH, Flathead, MT

Built 1935 Load: 23.6 t ADT: 100

W VALLEY DR

Fair

Over: ASHLEY CREEK 170

1M W KALISPELL, Flathead, MT

Built 1970 Load: 23.6 t ADT: 100

Showing 1,401-1,450 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.