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

S HOLLAND LAKE RD

Fair

Over: HOLLAND CREEK 051

HOLLAND LAKE, Missoula, MT

Built 1949 Load: 72.6 t ADT: 100

LARB CREEK RD

Fair

Over: BLANCHE COULEE 084

25M S SACO, Valley, MT

Built 1960 Load: 72.6 t ADT: 51

IRR - S 13

Fair

Over: DRAINAGE

10M N VIDA, McCone, MT

Built 1995 Load: 75.3 t ADT: 979

8TH LN NE

Fair

Over: MUDDY CREEK 015

N COLLINS, Teton, MT

Built 1987 Load: 75.3 t ADT: 87

TEN MILE RD

Fair

Over: COAL CREEK 005

18M S TERRY, Prairie, MT

Built 1987 Load: 76.2 t ADT: 100

IRR - S 13

Fair

Over: DRAINAGE

1M E WOLF POINT, Roosevelt, MT

Built 1978 Load: 76.2 t ADT: 1,459

IRR - S 39

Fair

Over: SHEEP CREEK

16M NW COLSTRIP, Rosebud, MT

Built 1982 Load: 76.2 t ADT: 782

JOCKO CANYON ROAD

Fair

Over: JOCKO RIVER 015

11M NE ARLEE, Lake, MT

Built 2003 Load: 77.8 t ADT: 100

I 94

Fair

Over: WHOOPUP CREEK

6M SW GLENDIVE, Dawson, MT

Built 1976 Load: 78.9 t ADT: 4,537

S MULLAN TRAIL RD

Fair

Over: RR 028

9M E DRUMMOND, Powell, MT

Built 2000 Load: 79.8 t ADT: 100

IRR - S 13

Fair

Over: GADY COULEE

5M N VIDA, McCone, MT

Built 1994 Load: 80.7 t ADT: 900

BURNS RD

Fair

Over: ROCK CREEK CANAL 029

5M E HINSDALE, Valley, MT

Built 2004 Load: 82.6 t ADT: 100

CORPORATION RD

Fair

Over: TWO LEGGIN`S CREEK 035

7M SW HARDIN, Big Horn, MT

Built 1991 Load: 83.5 t ADT: 100

SARPY CREEK RD

Fair

Over: SARPY CREEK

4M SW SANDERS, Treasure, MT

Built 1990 Load: 84.4 t ADT: 84

I 94

Fair

Over: BAD ROUTE CREEK

18M SW GLENDIVE, Dawson, MT

Built 1973 Load: 85.3 t ADT: 4,381

S 200

Fair

Over: FLAT CREEK

16M SW SIMMS, Lewis and Clark, MT

Built 1986 Load: 85.3 t ADT: 1,455

ROAD 261

Fair

Over: CLEAR CREEK 040

12M SW GLENDIVE, Dawson, MT

Built 1986 Load: 86.2 t ADT: 21

S 5

Fair

Over: MARRON CREEK

1M E PLENTYWOOD, Sheridan, MT

Built 1983 Load: 86.2 t ADT: 1,481

IRR - S 313

Fair

Over: OVERFLOW DITCH

7M SW HARDIN, Big Horn, MT

Built 1988 Load: 89.8 t ADT: 1,049

I 94

Fair

Over: LIGNITE CREEK

8M SW MILES CITY, Custer, MT

Built 1964 Load: 89.8 t ADT: 4,646

I 94

Fair

Over: COAL CREEK

7M SW MILES CITY, Custer, MT

Built 1963 Load: 89.8 t ADT: 4,646

S 59

Fair

Over: MILL CREEK-STOCKPASS

7M SE MILES CITY, Custer, MT

Built 1986 Load: 89.8 t ADT: 952

MARSH RD

Fair

Over: CAINS COULEE

S GLENDIVE, Dawson, MT

Built 1964 Load: 89.8 t ADT: 434

US 191

Fair

Over: GRAYLING CREEK

15M N WEST YELLOWSTONE, Gallatin, MT

Built 1962 Load: 89.8 t ADT: 2,481

US 191

Fair

Over: GRAYLING CREEK

16M N WEST YELLOWSTONE, Gallatin, MT

Built 1962 Load: 89.8 t ADT: 2,481

I 15

Fair

Over: DOG CREEK

1M S CRAIG, Lewis and Clark, MT

Built 1967 Load: 89.8 t ADT: 4,253

S 223

Fair

Over: COTTONWOOD CREEK

6M S CHESTER, Liberty, MT

Built 1963 Load: 89.8 t ADT: 407

S 223

Fair

Over: COTTONWOOD CREEK

2M S CHESTER, Liberty, MT

Built 1960 Load: 89.8 t ADT: 515

S 13

Fair

Over: LOST CREEK

5M NE CIRCLE, McCone, MT

Built 1988 Load: 89.8 t ADT: 905

IRR - S 13

Fair

Over: NICKWALL CREEK

12M N VIDA, McCone, MT

Built 1995 Load: 89.8 t ADT: 979

S 200

Fair

Over: GYP CREEK

3M NE CIRCLE, McCone, MT

Built 1960 Load: 89.8 t ADT: 237

S 200

Fair

Over: SECOND HAY CREEK

2M SW FAIRVIEW, Richland, MT

Built 1986 Load: 89.8 t ADT: 4,273

S 261

Fair

Over: PARSON CREEK

28M N WIBAUX, Richland, MT

Built 2008 Load: 89.8 t ADT: 74

S 5

Fair

Over: PLENTYWOOD CREEK

5M W PLENTYWOOD, Sheridan, MT

Built 2001 Load: 89.8 t ADT: 585

SLAUGHTER HSE LN

Fair

Over: S FORK SMITH RIVER 021

3M SW WHITE SULPHUR SPR, Meagher, MT

Built 1991 Load: 94.3 t ADT: 100

I 15

Fair

Over: DRAINAGE

13M N DILLON, Beaverhead, MT

Built 1973 Load: 99.9 t ADT: 3,803

BATTLEFIELD ROAD

Fair

Over: DEEP COULEE

I-90, EXIT 510, EAST ON U, Big Horn, MT

Built 1938 Load: 99.9 t ADT: 150

I 90

Fair

Over: IRRIGATION CANAL

3.1M S HARDIN, Big Horn, MT

Built 1971 Load: 99.9 t ADT: 8,497

IRR - S 314

Fair

Over: SPRING CREEK

5M N DECKER, Big Horn, MT

Built 1981 Load: 99.9 t ADT: 475

RIDGE RD

Fair

Over: THOMPSON CREEK 032

12M W ALZADA, Carter, MT

Built 1987 Load: 99.9 t ADT: 371

I 94

Fair

Over: JONES CREEK-STOCKPASS

8M NE MILES CITY, Custer, MT

Built 1962 Load: 99.9 t ADT: 4,494

I 94

Fair

Over: CRACKER BOX CREEK

13M SW GLENDIVE, Dawson, MT

Built 1973 Load: 99.9 t ADT: 4,277

I 94

Fair

Over: SAND CREEK

4M SW GLENIDVE, Dawson, MT

Built 1976 Load: 99.9 t ADT: 4,537

PLEASANT VIEW RD

Fair

Over: IRRIGATION CANAL 049

8M S GLENDIVE, Dawson, MT

Built 1983 Load: 99.9 t ADT: 100

COUNTY ROAD 523

Fair

Over: N FK THIRTEN MILE CR 064

5M E BLOOMFIELD, Dawson, MT

Built 1988 Load: 99.9 t ADT: 26

S 16

Fair

Over: THREE MILE CREEK

7M NE GLENDIVE, Dawson, MT

Built 1964 Load: 99.9 t ADT: 2,541

S 200

Fair

Over: DRAINAGE

5M NE RICHEY, Dawson, MT

Built 1958 Load: 99.9 t ADT: 305

S 254

Fair

Over: S FK THIRTEEN MILE CREEK

1M S BLOOMFIELD, Dawson, MT

Built 1986 Load: 99.9 t ADT: 183

WILLARD RD W

Fair

Over: O`FALLON CREEK 005

31M SW PLEVNA, Fallon, MT

Built 1995 Load: 99.9 t ADT: 100

UPPER CHIPPEWA RD

Fair

Over: CHIPPEWA CREEK 021

8M NW GRASSRANGE, Fergus, MT

Built 1962 Load: 99.9 t ADT: 100

Showing 3,251-3,300 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.