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

IRR - US 191

Poor

Over: WILD HORSE CREEK

20M SW MALTA, Phillips, MT

Built 1941 Load: 21.8 t ADT: 375

COUNTY ROAD 001

Poor

Over: HARDSCRABBLE CREEK 041

35M NW SIDNEY, Richland, MT

Built 1945 Load: 21.8 t ADT: 100

FRONTAGE ROAD 018

Poor

Over: IRRIGATION DITCH 001

1M E HYSHAM, Treasure, MT

Built 1933 Load: 21.8 t ADT: 279

WHALE CREEK ROAD

Poor

Over: WHALE CREEK

1 MI SW NINKO CABIN, Flathead, MT

Built 1954 Load: 22.4 t ADT: 10

STIBAL LN

Poor

Over: RED ROCK RIVER 053

9M NE MONIDA, Beaverhead, MT

Built 1975 Load: 22.7 t ADT: 100

MT HWY 91

Poor

Over: RR

3M SW DILLON, Beaverhead, MT

Built 1936 Load: 22.7 t ADT: 582

FOREST ROAD

Poor

Over: GRAVES CREEK

GRAVES CREEK AREA, Flathead, MT

Built 1970 Load: 22.7 t ADT: 10

MT 55

Poor

Over: FISH CREEK

9M SW WHITEHALL, Jefferson, MT

Built 1953 Load: 22.7 t ADT: 1,799

S FRONTAGE RD W

Poor

Over: CLARK FORK 053

2M W ALBERTON, Mineral, MT

Built 1916 Load: 22.7 t ADT: 171

S 474

Poor

Over: RR

4M SE FRENCHTOWN, Missoula, MT

Built 1959 Load: 22.7 t ADT: 1,371

IRR - S 358

Poor

Over: TWO MEDICINE RIVER

12M S CUT BANK, Pondera, MT

Built 1968 Load: 22.7 t ADT: 242

OLD HWY 2

Poor

Over: BEAVER CREEK 115

5M W HINSDALE, Valley, MT

Built 1931 Load: 22.7 t ADT: 100

FDR 209

Poor

Over: W FK MADISON RIVER

W FK MADISON RIVER, Madison, MT

Built 1957 Load: 23.0 t ADT: 35

OBERG RD

Poor

Over: VANDALIA SOUTH CANAL 078

5M W GLASGOW, Valley, MT

Built 1989 Load: 23.2 t ADT: 100

RD 231

Poor

Over: LAKE CR

1 MI E LAKE CR CAMPGROUND, Lincoln, MT

Built 1961 Load: 23.3 t ADT: 50

WAHLQUIST BR ROAD

Poor

Over: ROCK CREEK

AMBROSE ROCK CR, Missoula, MT

Built 1961 Load: 23.3 t ADT: 50

US 2

Poor

Over: IRRIGATION-STOCKPASS

1M E CHINOOK, Blaine, MT

Built 1940 Load: 23.6 t ADT: 2,254

S 78 FH 83

Poor

Over: RED LODGE CREEK

7M SE ROSCOE, Carbon, MT

Built 1953 Load: 23.6 t ADT: 478

E ELK PARK RD

Poor

Over: BISON CREEK 016

1M S ELK PARK, Jefferson, MT

Built 1927 Load: 23.6 t ADT: 100

FRONTAGE ROAD 303

Poor

Over: GRAVEYARD CREEK 055

1M E HATHAWAY, Rosebud, MT

Built 1928 Load: 23.6 t ADT: 127

S 200

Poor

Over: RR

2M SE NOXON, Sanders, MT

Built 1957 Load: 23.6 t ADT: 1,508

S 5

Poor

Over: DAHL CREEK

12M SW WESTBY, Sheridan, MT

Built 1939 Load: 23.6 t ADT: 307

US 2

Poor

Over: MOONEY COULEE

6M NW GLASGOW, Valley, MT

Built 1948 Load: 23.6 t ADT: 1,409

OLD HWY 312

Poor

Over: YELLOWSTONE RIVER 170

HUNTLEY, Yellowstone, MT

Built 1949 Load: 23.6 t ADT: 3,981

RD 4925

Poor

Over: CRIPPLE HORSE CR

.1 MI S JCT W/835, Lincoln, MT

Built 1963 Load: 23.7 t ADT: 50

NO DATA ENTERED

Poor

Over: E FK FISHTRAP

E FK FISHTRAP, Deer Lodge, MT

Built 1973 Load: 24.0 t ADT: 20

NO DATA ENTERED

Poor

Over: FOSTER CR

NORTH END OF AJC, Deer Lodge, MT

Built 1952 Load: 24.3 t ADT: 50

S 82

Poor

Over: FLATHEAD RIVER

3M NW BIG FORK, Flathead, MT

Built 1955 Load: 24.4 t ADT: 8,155

SOLLID RD

Poor

Over: DRAINAGE

20M E CONRAD, Pondera, MT

Built 1973 Load: 24.4 t ADT: 16

S 80-13TH ST

Poor

Over: MISSOURI RIVER

FORT BENTON-13TH ST, Chouteau, MT

Built 1962 Load: 24.5 t ADT: 924

ROAD 220

Poor

Over: CARROLL COULEE

SECT 22 T21N R26E, Fergus, MT

Built 1963 Load: 24.5 t ADT: 5

N DAWES STREET

Poor

Over: BIG SPRING CREEK 061

LEWISTOWN-N DAWES ST, Fergus, MT

Built 1940 Load: 24.5 t ADT: 100

MT HWY 2

Poor

Over: RR 061

4M W WHITEHALL, Jefferson, MT

Built 1932 Load: 24.5 t ADT: 982

MULLAN RD E

Poor

Over: NEMOTE CREEK 006

2M NW TARKIO, Mineral, MT

Built 1931 Load: 24.5 t ADT: 100

NF-6639 RD

Poor

Over: BOULDER RIVER 041

35M S SPRINGDALE, Park, MT

Built 1933 Load: 24.5 t ADT: 156

S 141

Poor

Over: NEVADA CREEK

13M NW AVON, Powell, MT

Built 1936 Load: 24.5 t ADT: 1,564

US 12

Poor

Over: DRAINAGE

4M E SUMATRA, Rosebud, MT

Built 1947 Load: 24.5 t ADT: 144

US 12

Poor

Over: DRAINAGE

31M NW FORSYTH, Rosebud, MT

Built 1941 Load: 24.5 t ADT: 144

US 2

Poor

Over: CHAPMAN COULEE

7M NW GLASGOW, Valley, MT

Built 1948 Load: 24.5 t ADT: 1,409

RD 6144

Poor

Over: BOBTAIL CR

BOBTAIL FACE, Lincoln, MT

Built 1973 Load: 24.9 t ADT: 50

SWANDAL RD

Poor

Over: FLATHEAD CREEK 073

3M W WILSALL, Park, MT

Built 1970 Load: 25.1 t ADT: 100

IRR BIA RTE 2

Poor

Over: DAWSON CREEK

2.4 KM SE OF E.GLACIER, Glacier, MT

Built 1932 Load: 25.2 t ADT: 100

S 287

Poor

Over: GRANITE CREEK

3M NW VIRGNIA CITY, Madison, MT

Built 1942 Load: 25.2 t ADT: 1,151

UPPER HIGHWOOD CR

Poor

Over: HIGHWOOD CREEK 069

6M SE HIGHWOOD, Chouteau, MT

Built 1969 Load: 25.4 t ADT: 100

US 87

Poor

Over: DRAINAGE

13M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 25.4 t ADT: 1,442

W DRY CREEK RD

Poor

Over: BAKER CREEK

1M E MANHATTAN, Gallatin, MT

Built 1967 Load: 25.4 t ADT: 1,263

S 200

Poor

Over: DRAINAGE

10M W BROCKWAY, McCone, MT

Built 1939 Load: 25.4 t ADT: 1,012

US 12 FH 11

Poor

Over: LOLO CREEK

LOLO HOT SPRINGS, Missoula, MT

Built 1957 Load: 25.4 t ADT: 747

STAGE RD

Poor

Over: WILD HORSE CREEK 023

17M S DODSON, Phillips, MT

Built 1925 Load: 25.4 t ADT: 100

FRONTAGE ROAD 018

Poor

Over: DRAINAGE 009

4M E HYSHAM, Treasure, MT

Built 1933 Load: 25.4 t ADT: 218

Showing 4,901-4,950 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.