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

OLD US 10

Fair

Over: VALLEY CREEK 019

1M W PARK CITY, Stillwater, MT

Built 1928 Load: 19.0 t ADT: 1,607

E BOULDER RD

Fair

Over: E BOULDER RIVER 032

4M S MCLEOD, Sweet Grass, MT

Built 1967 Load: 19.0 t ADT: 100

LOWER CANAL RD

Fair

Over: ARROW CREEK 102

BALLANTINE, Yellowstone, MT

Built 1950 Load: 19.0 t ADT: 100

IRR - S 66

Fair

Over: PEOPLES CREEK

19M S FORT BELKNAP AGENCY, Blaine, MT

Built 1952 Load: 19.1 t ADT: 758

NFSR 834

Fair

Over: HARLEY CREEK

1.2 MILES WEST US89, Cascade, MT

Built 1953 Load: 19.1 t ADT: 50

S 80

Fair

Over: RR

1M NW FORT BENTON, Chouteau, MT

Built 1953 Load: 19.1 t ADT: 844

ROAD 255

Fair

Over: IRRIGATION CANAL 046

11M SW GLENDIVE, Dawson, MT

Built 1986 Load: 19.1 t ADT: 100

WILDER TRAIL

Fair

Over: SACAGAWEA RIV 113

11M NE ROY, Fergus, MT

Built 2015 Load: 19.1 t ADT: 100

VALENTINE RD

Fair

Over: BLOOD CREEK 131

4M NW VALENTINE, Fergus, MT

Built 1980 Load: 19.1 t ADT: 100

FOREST GROVE RD

Fair

Over: S FORK MCDONALD CR 071

4M SW GRASSRANGE, Fergus, MT

Built 1970 Load: 19.1 t ADT: 146

US 87

Fair

Over: IRRIGATION RESERVOIR

6M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 19.1 t ADT: 1,300

S 81

Fair

Over: COFFEE CREEK

COFFEE CREEK, Fergus, MT

Built 1952 Load: 19.1 t ADT: 345

FOREST ROAD

Fair

Over: ADDITION CREEK

ADDITION CREEK, Flathead, MT

Built 1962 Load: 19.1 t ADT: 40

IRR - US 2

Fair

Over: MIDDLE FORK FLATHEAD RIV

ESSEX, Flathead, MT

Built 2002 Load: 19.1 t ADT: 1,929

COBB HILL RD

Fair

Over: HYALITE CREEK 050

4M W BOZEMAN, Gallatin, MT

Built 1987 Load: 19.1 t ADT: 100

GUNSIGHT RD

Fair

Over: TWO MEDICINE CANAL 01

10M W CUTBANK, Glacier, MT

Built 1989 Load: 19.1 t ADT: 100

I 15

Fair

Over: BOULDER RIVER

1.2M W BOULDER, Jefferson, MT

Built 1979 Load: 19.1 t ADT: 1,904

GLOVER RD

Fair

Over: PABLO 3A CANAL 037

4M S POLSON, Lake, MT

Built 1985 Load: 19.1 t ADT: 462

KOPP RD

Fair

Over: LITTLE BITTERROOT RV 062

8M NE HOT SPRINGS, Lake, MT

Built 1955 Load: 19.1 t ADT: 100

HOGUM CK ROAD

Fair

Over: HOGUM CREEK

HOGUM, Lewis and Clark, MT

Built 1962 Load: 19.1 t ADT: 46

YORK RD

Fair

Over: MISSOURI RIVER

14M NE HELENA, Lewis and Clark, MT

Built 1982 Load: 19.1 t ADT: 470

4626 STANLEY CR RD

Fair

Over: STANLEY CR

JUST PAST JCT WITH 4605, Lincoln, MT

Built 1963 Load: 19.1 t ADT: 99

NO DATA ENTERED

Fair

Over: BURNT CR

BURNT CR, Madison, MT

Built 1947 Load: 19.1 t ADT: 50

LEWIS/CLARK CMPGRD

Fair

Over: LOLO CR

LEWIS & CLARK CAMP, Missoula, MT

Built 1964 Load: 19.1 t ADT: 50

BROOKS ST-US 12

Fair

Over: BITTERROOT RIVER

MISSOULA-BROOKS ST, Missoula, MT

Built 1968 Load: 19.1 t ADT: 27,605

US 89

Fair

Over: BIG CREEK

7M SW EMIGRANT, Park, MT

Built 1960 Load: 19.1 t ADT: 1,547

SOLLID RD

Fair

Over: PONDERA COULEE

10M E CONRAD, Pondera, MT

Built 1964 Load: 19.1 t ADT: 69

BIG POWDER R E RD

Fair

Over: LITTLE POWDER RIVER 028

5M E BROADUS, Powder River, MT

Built 1947 Load: 19.1 t ADT: 106

OVANDO HELMVILLE R

Fair

Over: BIG BLACKFOOT RIVER 006

6M N HELMVILLE, Powell, MT

Built 1953 Load: 19.1 t ADT: 50

NO DATA ENTERED

Fair

Over: E F BITTERROOT

NO DATA ENTERED, Ravalli, MT

Built 1947 Load: 19.1 t ADT: 50

COUNTY ROAD 023

Fair

Over: BRORSON CREEK 012

3M NW SIDNEY, Richland, MT

Built 1997 Load: 19.1 t ADT: 100

AIRPORT RD

Fair

Over: SPRING CREEK 111

NW EDGE CHOTEAU, Teton, MT

Built 1960 Load: 19.1 t ADT: 437

OLD HWY 10

Fair

Over: IRRIGATION DITCH 022

9M E HYSHAM, Treasure, MT

Built 2011 Load: 19.1 t ADT: 218

2009: TC ACCESS

Fair

Over: WILLOW CREEK

15 mi W of Lake Fort Peck, Valley, MT

Built 1967 Load: 19.1 t ADT: 25

E I RD

Fair

Over: ARROW CREEK 145

1M E WORDEN, Yellowstone, MT

Built 1964 Load: 19.1 t ADT: 100

S 56TH ST W

Fair

Over: BBWA CANAL 074

BILLINGS-S 56TH ST W, Yellowstone, MT

Built 1925 Load: 19.1 t ADT: 2,785

DANFORD RD

Fair

Over: BIG DITCH 109

SW BILLINGS, Yellowstone, MT

Built 1936 Load: 19.1 t ADT: 124

N 24TH ST

Fair

Over: BBWA CANAL 207

BILLINGS-N 24TH ST W, Yellowstone, MT

Built 1988 Load: 19.1 t ADT: 5,823

PORCUPINE BUTTE RD

Fair

Over: AMERICAN FORK CREEK 002

12M S TWO DOT, Wheatland, MT

Built 1960 Load: 19.2 t ADT: 100

SUNDAY CR ROAD

Fair

Over: SUNDAY CR

SUNDAY CR, Flathead, MT

Built 1982 Load: 19.4 t ADT: 40

SUCKER KP KL ROAD

Fair

Over: COPPER CREEK

KEEP KOOL-COPPER, Lewis and Clark, MT

Built 1962 Load: 19.4 t ADT: 34

472 BURNT DUTCH RD

Fair

Over: SOUTH FORK YAAK RIVER

JCT 472 & 68, Lincoln, MT

Built 1957 Load: 19.4 t ADT: 25

WOODBINE CAMPGRD

Fair

Over: STILLWATER RIVER

1-LANE ROAD, Stillwater, MT

Built 1962 Load: 19.4 t ADT: 99

MOORE RD

Fair

Over: CROW CREEK 034

21M NW HAMMOND, Carter, MT

Built 1938 Load: 19.5 t ADT: 100

WILLOW CREEK RD

Fair

Over: BITTERROOT CANAL 061

4M E CORVALLIS, Ravalli, MT

Built 1964 Load: 19.6 t ADT: 100

BLOODY D--- ROAD

Fair

Over: BLOODY D--- CR

BLOODY D--- CR, Beaverhead, MT

Built 1961 Load: 19.8 t ADT: 2

LONE TREE RD

Fair

Over: RED LODGE CREEK 045

1M NW BOYD, Carbon, MT

Built 1972 Load: 19.8 t ADT: 100

NFSR 834

Fair

Over: HARLEY CREEK

0.2 MILES WEST US89, Cascade, MT

Built 1953 Load: 19.8 t ADT: 50

ASHLEY LAKE RD

Fair

Over: ASHLEY CREEK 096

7M NE MARION, Flathead, MT

Built 1999 Load: 19.8 t ADT: 151

NO DATA ENTERED

Fair

Over: BISON CREEK

BERNICE JUNCTION, Jefferson, MT

Built 1986 Load: 19.8 t ADT: 50

Showing 1,051-1,100 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.