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

STYLER DR

Fair

Over: GLACIER CR OVRFLOW 060

2M SW CONDON, Missoula, MT

Built 1974 Load: 38.1 t ADT: 100

S 200

Fair

Over: BLACKFOOT RIVER

4M E BONNER, Missoula, MT

Built 1968 Load: 38.1 t ADT: 4,601

S 200

Fair

Over: CLEARWATER RIVER

CLEARWATER JCT, Missoula, MT

Built 1949 Load: 38.1 t ADT: 3,070

SIX MILE CREEK RD

Fair

Over: SIX MILE CREEK 055

6M S EMIGRANT, Park, MT

Built 1974 Load: 38.1 t ADT: 100

S 540-E RIVER RD

Fair

Over: EMIGRANT CREEK

5M SW PRAY, Park, MT

Built 2006 Load: 38.1 t ADT: 257

US 2

Fair

Over: BEAVER CREEK OVERFLOW

9M W SACO, Phillips, MT

Built 1968 Load: 38.1 t ADT: 1,250

US 191

Fair

Over: DODSON SOUTH CANAL

SOUTH EDGE OF MALTA, Phillips, MT

Built 2000 Load: 38.1 t ADT: 2,218

CREE CROSSING

Fair

Over: MILK RIVER

15M NW SACO, Phillips, MT

Built 1999 Load: 38.1 t ADT: 39

S 363

Fair

Over: ALKALI CREEK

4M SW MALTA, Phillips, MT

Built 1966 Load: 38.1 t ADT: 160

I 94

Fair

Over: O`FALLON CREEK

1M SW FALLON, Prairie, MT

Built 1969 Load: 38.1 t ADT: 1,914

IRR - S 13

Fair

Over: W FORK POPLAR RIVER

18M S SCOBEY, Roosevelt, MT

Built 2005 Load: 38.1 t ADT: 179

OLD HWY 10

Fair

Over: ROSEBUD CREEK

2M W ROSEBUD, Rosebud, MT

Built 2005 Load: 38.1 t ADT: 374

S 135

Fair

Over: CLARK FORK RIVER

11M SW PARADISE, Sanders, MT

Built 1962 Load: 38.1 t ADT: 1,985

NYE RD-S 419

Fair

Over: EAST ROSEBUD CREEK

3M NE FISHTAIL, Stillwater, MT

Built 1992 Load: 38.1 t ADT: 1,544

HOWIE RD

Fair

Over: DRAINAGE 021

3M NE BIG TIMBER, Sweet Grass, MT

Built 1923 Load: 38.1 t ADT: 163

S 431

Fair

Over: GREENFIELD MAIN CANAL

8M NE FAIRFIELD, Teton, MT

Built 1959 Load: 38.1 t ADT: 283

US 2

Fair

Over: BEAVER CREEK

4M NW HINSDALE, Valley, MT

Built 1966 Load: 38.1 t ADT: 1,244

US 2

Fair

Over: LIME CREEK

9M E HINSDALE, Valley, MT

Built 1996 Load: 38.1 t ADT: 1,148

TAMPICO RD

Fair

Over: ANTELOPE CREEK

5M SE TAMPICO, Valley, MT

Built 1980 Load: 38.1 t ADT: 182

I 90

Fair

Over: BBWA CANAL

3.7M E LAUREL, Yellowstone, MT

Built 1964 Load: 38.1 t ADT: 14,099

I 90

Fair

Over: BBWA CANAL

3.7M E LAUREL, Yellowstone, MT

Built 1964 Load: 38.1 t ADT: 14,099

YARD OFFICE ROAD

Fair

Over: BIG DITCH 110

LAUREL-YARD OFFICE ROAD, Yellowstone, MT

Built 1982 Load: 38.1 t ADT: 100

KRAFT CREEK RD

Fair

Over: GLACIER CREEK

KRAFT CK RD AT GLACIER CK, Missoula, MT

Built 2019 Load: 38.2 t ADT: 10

LAKNAR LN

Fair

Over: BEAVERHEAD RIVER 095

1M N DILLON, Beaverhead, MT

Built 2001 Load: 38.3 t ADT: 2,823

FDR 192

Fair

Over: ROCK CR

ROCK CR, Beaverhead, MT

Built 1986 Load: 38.6 t ADT: 40

SKUNK CREEK ROAD

Fair

Over: BRACKETT CREEK

BANGTAILS - N.OF BOZEMAN, Gallatin, MT

Built 1972 Load: 38.6 t ADT: 50

NO DATA ENTERED

Fair

Over: FISH CREEK

FISH CR LOLO CR, Mineral, MT

Built 1967 Load: 38.9 t ADT: 40

IRR - S 451

Fair

Over: LITTLE BIGHORN RIVER

8M S GARRYOWEN INT, Big Horn, MT

Built 1955 Load: 39.0 t ADT: 944

US 2

Fair

Over: MILK RIVER

6M W CHINOOK, Blaine, MT

Built 2004 Load: 39.0 t ADT: 2,563

US 287

Fair

Over: DEEP CREEK

2M S TOWNSEND, Broadwater, MT

Built 2012 Load: 39.0 t ADT: 5,310

HAMMOND RD

Fair

Over: BOX ELDER CREEK

31M NE HAMMOND, Carter, MT

Built 2000 Load: 39.0 t ADT: 33

WYTTENHOVE LN

Fair

Over: BENSLEY CREEK 030

4M NE MILES CITY, Custer, MT

Built 2016 Load: 39.0 t ADT: 355

PACIFIC AVE

Fair

Over: TONGUE RIVER 056

SW EDGE MILES CITY, Custer, MT

Built 2006 Load: 39.0 t ADT: 100

S 511

Fair

Over: N FORK WHITETAIL CREEK

1M N WHITETAIL, Daniels, MT

Built 1934 Load: 39.0 t ADT: 24

GALEN RD E

Fair

Over: CLARK FORK RIVER 038

GALEN, Deer Lodge, MT

Built 1973 Load: 39.0 t ADT: 100

US 12

Fair

Over: DRAINAGE

WEST EDGE BAKER, Fallon, MT

Built 1998 Load: 39.0 t ADT: 1,590

S 2

Fair

Over: JEFFERSON RIVER

2M W THREE FORKS, Gallatin, MT

Built 1949 Load: 39.0 t ADT: 1,487

IRR - US 2

Fair

Over: WILLOW CREEK

BLACKFOOT, Glacier, MT

Built 1957 Load: 39.0 t ADT: 2,054

CATARACT CREEK RD

Fair

Over: CATARACT CREEK 035

2M N BASIN, Jefferson, MT

Built 1965 Load: 39.0 t ADT: 100

US 93

Fair

Over: GRADE SEPARATION

2M N RAVALLI, Lake, MT

Built 2006 Load: 39.0 t ADT: 6,822

S 83 FH 15

Fair

Over: GOAT CREEK

12M S SWAN LAKE, Lake, MT

Built 2004 Load: 39.0 t ADT: 1,166

I 90

Fair

Over: ST. REGIS RVR-INT RAMP

ST. REGIS, Mineral, MT

Built 1983 Load: 39.0 t ADT: 822

E SAGER LN

Fair

Over: CLARK FORK RIVER 048

5M S DEER LODGE, Powell, MT

Built 2006 Load: 39.0 t ADT: 100

I 94

Fair

Over: POWDER RIVER

7M SW TERRY, Prairie, MT

Built 1971 Load: 39.0 t ADT: 2,110

I 94

Fair

Over: POWDER RIVER

7M SW TERRY, Prairie, MT

Built 1971 Load: 39.0 t ADT: 2,110

S 16

Fair

Over: BURNS CREEK

6M SW SAVAGE, Richland, MT

Built 2011 Load: 39.0 t ADT: 1,856

S 16

Fair

Over: FIRST HAY CREEK

10M NW SIDNEY, Richland, MT

Built 2004 Load: 39.0 t ADT: 1,350

S 408

Fair

Over: USRS LAT DITCH

1M W FAIRFIELD, Teton, MT

Built 1953 Load: 39.0 t ADT: 392

COUNTY ROAD 202

Fair

Over: FIRST HAY CREEK 024

5M N SIDNEY, Richland, MT

Built 1997 Load: 39.2 t ADT: 339

FRONTAGE RD-S 205

Fair

Over: GALLATIN RIVER

3M SE MANHATTAN, Gallatin, MT

Built 1949 Load: 39.3 t ADT: 2,981

Showing 3,001-3,050 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.