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

FRONTAGE ROAD 146

Fair

Over: DRAINAGE 025

4M S WARM SPRINGS, Deer Lodge, MT

Built 1931 Load: 26.3 t ADT: 100

US 191-1ST AVE N

Fair

Over: BIG SPRING CREEK

LEWISTOWN-1ST AVE N, Fergus, MT

Built 1960 Load: 26.3 t ADT: 6,387

US 87

Fair

Over: DRAINAGE

10M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 26.3 t ADT: 1,442

HANOVER RD

Fair

Over: BIG SPRING CREEK

8M NW LEWISTOWN, Fergus, MT

Built 1966 Load: 26.3 t ADT: 1

RIVERSIDE RD

Fair

Over: MILL CREEK 148

1M SE CRESTON, Flathead, MT

Built 1989 Load: 26.3 t ADT: 100

RINGNECK DR

Fair

Over: STILLWATER RIVER 153

2M SE KALISPELL, Flathead, MT

Built 1992 Load: 26.3 t ADT: 100

BLACKWOOD RD

Fair

Over: HYALITE CREEK 052

4M SW BOZEMAN, Gallatin, MT

Built 1971 Load: 26.3 t ADT: 100

US 191

Fair

Over: SPECIMEN CREEK

24M SE BIG SKY, Gallatin, MT

Built 1955 Load: 26.3 t ADT: 2,481

VAN NORMAN RD

Fair

Over: WOODY CREEK 001

26M NE JORDAN, Garfield, MT

Built 2004 Load: 26.3 t ADT: 100

MULLAN RD E

Fair

Over: FLINT CREEK 001

2M S DRUMMOND, Granite, MT

Built 1998 Load: 26.3 t ADT: 100

GOLD COIN ROAD

Fair

Over: FLINT CREEK 017

13M S DRUMMOND, Granite, MT

Built 1984 Load: 26.3 t ADT: 100

I 15 FRONTAGE RD

Fair

Over: BOULDER RIVER 042

BASIN, Jefferson, MT

Built 1985 Load: 26.3 t ADT: 100

US 89 FH 32

Fair

Over: SHEEP CREEK

17M SW NEIHART, Meagher, MT

Built 1939 Load: 26.3 t ADT: 369

I 90

Fair

Over: ST. REGIS RIVER

SALTESE, Mineral, MT

Built 1973 Load: 26.3 t ADT: 7,352

I 90

Fair

Over: CLARK FORK RIVER

1.9M E SUPERIOR, Mineral, MT

Built 1966 Load: 26.3 t ADT: 3,776

I 90

Fair

Over: RR

9.3M W ALBERTON, Mineral, MT

Built 1981 Load: 26.3 t ADT: 4,036

MULLAN GULCH RD

Fair

Over: TWELVEMILE CREEK 014

HENDERSON, Mineral, MT

Built 1931 Load: 26.3 t ADT: 147

GOULDING CREEK RD

Fair

Over: MUSSELSHELL RIVER

7M SW ROUNDUP, Musselshell, MT

Built 1949 Load: 26.3 t ADT: 246

US 89

Fair

Over: KAY CREEK

6M SE CLYDE PARK, Park, MT

Built 1984 Load: 26.3 t ADT: 1,430

DEHY RD

Fair

Over: BEAVER CREEK 118

3M NW SACO, Phillips, MT

Built 2003 Load: 26.3 t ADT: 100

OLD US HWY 2

Fair

Over: BEAVER CREEK 101

20M E MALTA, Phillips, MT

Built 1932 Load: 26.3 t ADT: 100

KID CURRY RD

Fair

Over: EXETER CREEK 004

4M W MALTA, Phillips, MT

Built 1930 Load: 26.3 t ADT: 100

IRR - US 191

Fair

Over: BIG WARM CREEK

23M SW MALTA, Phillips, MT

Built 1941 Load: 26.3 t ADT: 375

US 191

Fair

Over: ASSINIBOINE CREEK

6M NE MALTA, Phillips, MT

Built 1936 Load: 26.3 t ADT: 211

US 12

Fair

Over: LITTLE BLACKFOOT RIVER

1M W AVON, Powell, MT

Built 1982 Load: 26.3 t ADT: 3,129

S 253

Fair

Over: DRAINAGE

18M NW TERRY, Prairie, MT

Built 1940 Load: 26.3 t ADT: 366

IRON CAP DR

Fair

Over: IRRIGATION CANAL 054

5M SE STEVENSVILLE, Ravalli, MT

Built 1972 Load: 26.3 t ADT: 100

COUNTY ROAD 015

Fair

Over: CHARLIE CREEK 039

37M NW SIDNEY, Richland, MT

Built 2004 Load: 26.3 t ADT: 100

I 94

Fair

Over: ROSEBUD CREEK

1M W ROSEBUD, Rosebud, MT

Built 1970 Load: 26.3 t ADT: 2,602

FRONTAGE ROAD 020

Fair

Over: RESERVATION CREEK 036

12M W FORSYTH, Rosebud, MT

Built 1928 Load: 26.3 t ADT: 25

OLD HWY 10 E

Fair

Over: ARMELLS CREEK 045

5M W FORSYTH, Rosebud, MT

Built 1932 Load: 26.3 t ADT: 350

IRR - S 39

Fair

Over: EAST FORK ARMELLS CREEK

16M NW COLSTRIP, Rosebud, MT

Built 1983 Load: 26.3 t ADT: 782

W RESERVE HWY

Fair

Over: BIG MUDDY CREEK

E EDGE RESERVE, Sheridan, MT

Built 1949 Load: 26.3 t ADT: 150

MILES CROSSING

Fair

Over: SILVER BOW CREEK 010

2M W RAMSEY, Silver Bow, MT

Built 2007 Load: 26.3 t ADT: 37

I 90

Fair

Over: YELLOWSTONE RIVER

5.6M E REED POINT, Stillwater, MT

Built 1976 Load: 26.3 t ADT: 5,353

I 90

Fair

Over: VALLEY CREEK

1.9M W PARK CITY, Stillwater, MT

Built 1970 Load: 26.3 t ADT: 5,470

I 90

Fair

Over: VALLEY CREEK

1.9M W PARK CITY, Stillwater, MT

Built 1970 Load: 26.3 t ADT: 5,470

OLD US 10

Fair

Over: WORK CREEK 041

4M W REED POINT, Sweet Grass, MT

Built 1932 Load: 26.3 t ADT: 29

US 191

Fair

Over: YELLOWSTONE RIVER

1M N BIG TIMBER, Sweet Grass, MT

Built 1938 Load: 26.3 t ADT: 1,689

US 287

Fair

Over: TETON RIVER

1M S CHOTEAU, Teton, MT

Built 1978 Load: 26.3 t ADT: 529

S 221

Fair

Over: TETON RIVER

5M E CHOTEAU, Teton, MT

Built 1939 Load: 26.3 t ADT: 182

MARIAS VALLEY RD

Fair

Over: MARIAS RIVER 001

5M S SHELBY, Toole, MT

Built 1936 Load: 26.3 t ADT: 649

GRAIN EAST RD

Fair

Over: LITTLE PORCUPINE CR 055

7M W LUSTRE, Valley, MT

Built 1985 Load: 26.3 t ADT: 56

BERGE RD

Fair

Over: LITTLE PORCUPINE CR 015

N FRAZER, Valley, MT

Built 1980 Load: 26.3 t ADT: 100

FOX FARM RD

Fair

Over: LINDEKE COULEE 007

8M E GLASGOW, Valley, MT

Built 1930 Load: 26.3 t ADT: 100

S 297

Fair

Over: ROBERTS CREEK

8M N SHAWMUT, Wheatland, MT

Built 1974 Load: 26.3 t ADT: 34

I 94

Fair

Over: PRYOR CREEK

0.6M E HUNTLEY, Yellowstone, MT

Built 1967 Load: 26.3 t ADT: 3,006

I 94

Fair

Over: PRYOR CREEK

0.6M E HUNTLEY, Yellowstone, MT

Built 1967 Load: 26.3 t ADT: 3,006

HOGAN RD

Fair

Over: PRYOR CREEK 007

7M S HUNTLEY, Yellowstone, MT

Built 1979 Load: 26.3 t ADT: 100

S 12TH RD

Fair

Over: HUNTLEY MAIN CANAL 156

6M NE HUNTLEY, Yellowstone, MT

Built 1976 Load: 26.3 t ADT: 5

Showing 1,801-1,850 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.