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

US 2

Good

Over: PARMENTER CREEK

1M NW LIBBY, Lincoln, MT

Built 1970 Load: 37.2 t ADT: 3,663

CALIFORNIA AVE

Good

Over: RR

LIBBY-CALIFORNIA AVE, Lincoln, MT

Built 1999 Load: 37.2 t ADT: 4,743

S 508 FH 62

Good

Over: MEADOW CREEK

11M SW YAAK, Lincoln, MT

Built 1994 Load: 37.2 t ADT: 255

US-12

Good

Over: WHETSTONE CREEK

5M E CHECKERBOARD, Meagher, MT

Built 2012 Load: 37.2 t ADT: 341

HORSE CAMP ROAD

Good

Over: SACAGAWEA RIVER

38 MILES NORTH OF WINNETT, Petroleum, MT

Built 2015 Load: 37.2 t ADT: 100

MAIN ST

Good

Over: COTTONWOOD CREEK

DEER LODGE-MAIN ST, Powell, MT

Built 2014 Load: 37.2 t ADT: 4,979

LAKE COMO RD

Good

Over: ROCK CREEK 100

4M N DARBY, Ravalli, MT

Built 1977 Load: 37.2 t ADT: 100

US 93 FH 19

Good

Over: E FORK BITTERROOT RIVER

S SULA, Ravalli, MT

Built 2003 Load: 37.2 t ADT: 1,069

BELLVIEW RD

Good

Over: DOG CREEK 062

8M SW CHOTEAU, Teton, MT

Built 2013 Load: 37.2 t ADT: 100

S BELLVIEW RD

Good

Over: DOG CREEK 069

6M SW CHOTEAU, Teton, MT

Built 2013 Load: 37.2 t ADT: 100

S 431

Good

Over: MUDDY CREEK

2M W POWER, Teton, MT

Built 1970 Load: 37.2 t ADT: 503

FOREST SYSTEM ROAD

Good

Over: SWAN RIVER

NO DATA ENTERED, Lake, MT

Built 2012 Load: 37.3 t ADT: 50

REMINI RD

Good

Over: TEN MILE CREEK 103

13M SW HELENA, Lewis and Clark, MT

Built 2015 Load: 37.3 t ADT: 230

NO DATA ENTERED

Good

Over: LODGEPOLE CR

SPRUCE CR, Powell, MT

Built 1996 Load: 37.3 t ADT: 40

RIMINI RD

Good

Over: TEN MILE CREEK 102

12M SW HELENA, Lewis and Clark, MT

Built 2015 Load: 37.6 t ADT: 230

BIG CREEK ROAD

Good

Over: LITTLE NF BIG CREEK

LITTLE NF BIG CREEK, Lincoln, MT

Built 1995 Load: 37.6 t ADT: 40

0427: MCNAMARA ROA

Good

Over: Belmont Creek

8 mi NE of Johnsrud Rd /, Missoula, MT

Built 2020 Load: 37.6 t ADT: 25

IRR BIA RTE 13

Good

Over: GREASEWOOD CREEK

6.4KM N OF BLACKFEET SCHL, Glacier, MT

Built 1984 Load: 37.8 t ADT: 60

DRY FORK RD

Good

Over: DRY FK MARIAS 051

4M NW CONRAD, Pondera, MT

Built 1985 Load: 37.8 t ADT: 54

ANTELOP CREEK RD

Good

Over: JUDITH RIVER 008

1M S UTICA, Judith Basin, MT

Built 2011 Load: 37.9 t ADT: 100

REVAIS CREEK ROAD

Good

Over: REVAIS CREEK 103

1.5M S MT 200, Sanders, MT

Built 2012 Load: 37.9 t ADT: 100

I 90

Good

Over: FLY CREEK

16.8M W HARDIN, Big Horn, MT

Built 1972 Load: 38.1 t ADT: 3,688

IRR - US 2

Good

Over: WHITE BEAR CREEK

11M W DODSON, Blaine, MT

Built 1993 Load: 38.1 t ADT: 1,281

US 87-US 89

Good

Over: BOX ELDER CREEK

8M SE GREAT FALLS, Cascade, MT

Built 1989 Load: 38.1 t ADT: 4,303

COUNTY RD 306

Good

Over: TWIN LAKES CREEK 094

8M W ANACONDA, Deer Lodge, MT

Built 2013 Load: 38.1 t ADT: 100

S-81

Good

Over: WOLF CREEK

DENTON, Fergus, MT

Built 2022 Load: 38.1 t ADT: 369

DOUGLAS CREEK ROAD

Good

Over: FLINT CREEK 004

8M S DRUMMOND, Granite, MT

Built 2015 Load: 38.1 t ADT: 100

US 93

Good

Over: WILDLIFE UNDERPASS

1M SE POLSON, Lake, MT

Built 2006 Load: 38.1 t ADT: 7,781

MILL ROAD

Good

Over: HELENA VALLEY CANAL 082

2M NW HELENA, Lewis and Clark, MT

Built 2021 Load: 38.1 t ADT: 1,264

BARR CREEK RD

Good

Over: WILLOW CREEK 026

8M NW AUGUSTA, Lewis and Clark, MT

Built 1991 Load: 38.1 t ADT: 100

US 2

Good

Over: CEDAR CREEK

4M NW LIBBY, Lincoln, MT

Built 1989 Load: 38.1 t ADT: 3,663

US 2

Good

Over: FLOWER CREEK

LIBBY, Lincoln, MT

Built 1970 Load: 38.1 t ADT: 8,640

VIDA EAST RD

Good

Over: WOLF CREEK 032

5M E VIDA, McCone, MT

Built 2006 Load: 38.1 t ADT: 100

SWIFT DAM RD

Good

Over: SHEEP CREEK 082

9M NW DUPUYER, Pondera, MT

Built 2014 Load: 38.1 t ADT: 40

I 94

Good

Over: O`FALLON CREEK

1M SW FALLON, Prairie, MT

Built 1969 Load: 38.1 t ADT: 1,914

S 16-HOLLY ST

Good

Over: USRS CANAL

NW EDGE SIDNEY-HOLLY ST, Richland, MT

Built 1999 Load: 38.1 t ADT: 5,753

US 12

Good

Over: HORSE CREEK

24M NW FORSYTH, Rosebud, MT

Built 2012 Load: 38.1 t ADT: 144

W FK ELK CREEK RD

Good

Over: W FORK ELK CREEK 052

5M SW HERON, Sanders, MT

Built 1965 Load: 38.1 t ADT: 100

S 78

Good

Over: BEAVER CREEK

2M NE ABSAROKEE, Stillwater, MT

Built 2010 Load: 38.1 t ADT: 2,305

RAPELJE RD

Good

Over: SWEET GRASS CREEK

11M NE BIG TIMBER, Sweet Grass, MT

Built 1993 Load: 38.1 t ADT: 57

US 2

Good

Over: WEST FORK WILLOW CREEK

2M E DEVON, Toole, MT

Built 2019 Load: 38.1 t ADT: 899

HWY 117

Good

Over: BNSF RAILROAD

1 M W NASHUA, Valley, MT

Built 2018 Load: 38.1 t ADT: 100

SHANE RIDGE RD

Good

Over: RED LODGE CREEK 044

2M SW BOYD, Carbon, MT

Built 2013 Load: 38.2 t ADT: 100

FOREST ROAD

Good

Over: S.FK FLATHEAD RIVER

BY SPOTTED BEAR RANGER ST, Flathead, MT

Built 1973 Load: 38.2 t ADT: 100

KETOWKE CR ROAD

Good

Over: SUNDAY CR

SUNDAY CR, Flathead, MT

Built 1998 Load: 38.2 t ADT: 40

ROAD 358

Good

Over: HARVEY CREEK

HARVEY CREEK, Granite, MT

Built 1984 Load: 38.2 t ADT: 40

COUNTY ROAD 468

Good

Over: DIVERSION CANAL 079

1M W MEDICINE LAKE, Sheridan, MT

Built 2004 Load: 38.3 t ADT: 68

IRR BIA RTE 1

Good

Over: BIG HORN CANAL

16 KM W OF CROW AGENCY, Big Horn, MT

Built 2001 Load: 38.5 t ADT: 400

FS RTE 192

Good

Over: ROCK CREEK

ROCK CR, Beaverhead, MT

Built 1986 Load: 38.6 t ADT: 40

FOREST ROAD

Good

Over: JUNGLE CREEK

JUNGLE CR, Flathead, MT

Built 1982 Load: 38.6 t ADT: 40

Showing 4,451-4,500 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.