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 13

Good

Over: EAST FORK POPLAR RIVER

4M N SCOBEY, Daniels, MT

Built 1957 Load: 25.4 t ADT: 224

S 13

Good

Over: EAST FORK POPLAR RIVER

8M N SCOBEY, Daniels, MT

Built 1957 Load: 25.4 t ADT: 42

ASH CR RD E

Good

Over: E FORK BEAVER CREEK 055

21M NE BAKER, Fallon, MT

Built 2003 Load: 25.4 t ADT: 100

HODGSON RD

Good

Over: WHITEFISH RIVER 035

7M SE WHITEFISH, Flathead, MT

Built 1988 Load: 25.4 t ADT: 1,512

WILSON CREEK RD

Good

Over: IRRIGATION CANAL

4M S GALLATIN GATEWAY, Gallatin, MT

Built 2019 Load: 25.4 t ADT: 100

S 3

Good

Over: BIG COULEE CREEK

1M S LAVINA, Golden Valley, MT

Built 1959 Load: 25.4 t ADT: 2,052

METESH LANE

Good

Over: FLINT CREEK 055

5M SW PHILLIPSBURG, Granite, MT

Built 2009 Load: 25.4 t ADT: 100

HILLSIDE ROAD

Good

Over: MISSION CREEK

1.5 MILES E. ST. IGNATIUS, Lake, MT

Built 2021 Load: 25.4 t ADT: 100

CHEVALLIER DR

Good

Over: LITTLE PRICKLY PEAR 110

5M SW SIEBEN INT, Lewis and Clark, MT

Built 2012 Load: 25.4 t ADT: 37

S 249 - VARNEY RD

Good

Over: MADISON RIVER

8M S ENNIS, Madison, MT

Built 2020 Load: 25.4 t ADT: 441

BURMA RD

Good

Over: BIG HOLE RIVER OVER 062

1M SE GLEN, Madison, MT

Built 2000 Load: 25.4 t ADT: 100

LOISELLE LN

Good

Over: FRENCHTOWN IRR CANAL 099

3M S FRENCHTOWN, Missoula, MT

Built 1960 Load: 25.4 t ADT: 201

I 90

Good

Over: QUINN CREEK ROAD

11.2M W LIVINGSTON, Park, MT

Built 2022 Load: 25.4 t ADT: 4,841

WELTER DIVIDE RD

Good

Over: BOX ELDER CREEK 010

13M NE TEIGEN, Petroleum, MT

Built 1994 Load: 25.4 t ADT: 100

SKYVIEW RD S

Good

Over: DRY FK MARIAS RIVER 069

6M SE DUPUYER, Pondera, MT

Built 1987 Load: 25.4 t ADT: 100

MOORHEAD RD

Good

Over: POWDER RIVER 006

25M W BIDDLE, Powder River, MT

Built 2022 Load: 25.4 t ADT: 100

COUNTY ROAD 129

Good

Over: USBR MAIN CANAL 067

6M SW FAIRVIEW, Richland, MT

Built 2015 Load: 25.4 t ADT: 81

COUNTY ROAD 128

Good

Over: USBR MAIN CANAL 089

4M N SIDNEY, Richland, MT

Built 1997 Load: 25.4 t ADT: 100

ACORN FLATS RD

Good

Over: BIG PORCUPINE CR 005

13M NE INGOMAR, Rosebud, MT

Built 2007 Load: 25.4 t ADT: 100

NYE RD-S 419

Good

Over: W ROSEBUD CREEK OVERFLOW

FISHTAIL, Stillwater, MT

Built 1991 Load: 25.4 t ADT: 1,544

I 90

Good

Over: CNTY RD 113-FRYER CREEK

4.3M E SPRINGDALE, Sweet Grass, MT

Built 1983 Load: 25.4 t ADT: 6,078

I 15

Good

Over: TETON RIVER

6M N DUTTON, Teton, MT

Built 1977 Load: 25.4 t ADT: 1,681

US 89

Good

Over: GREENFIELDS SOUTH CANAL

3M SE FAIRFIELD, Teton, MT

Built 1983 Load: 25.4 t ADT: 1,787

SHERROD LN

Good

Over: FLY CREEK 142

2M SW POMPEY`S PILLAR, Yellowstone, MT

Built 1973 Load: 25.4 t ADT: 100

BITTERROOT DR

Good

Over: FIVE MILE CREEK 119

N BILLINGS HEIGHTS, Yellowstone, MT

Built 1999 Load: 25.4 t ADT: 1,563

STRAUCH RD

Good

Over: BBWA CANAL 063

1M E LAUREL, Yellowstone, MT

Built 2014 Load: 25.4 t ADT: 100

SS-11A

Good

Over: SWAN RIVER 111

LINDBERGH LAKE ROAD, Missoula, MT

Built 1978 Load: 25.5 t ADT: 100

BIG SHEEP CR RD

Good

Over: BIG SHEEP CREEK 015

3M S DELL, Beaverhead, MT

Built 2016 Load: 25.6 t ADT: 175

NFSR 233

Good

Over: M FK BEAVER CREEK

BEAVER CREEK NO. 4, Lewis and Clark, MT

Built 1978 Load: 25.6 t ADT: 26

NO DATA ENTERED

Good

Over: MOOSE CREEK

NO DATA ENTERED, Ravalli, MT

Built 2007 Load: 25.6 t ADT: 40

NO DATA ENTERED

Good

Over: NFSR 5758 AND NFSR 725

NO DATA ENTERED, Ravalli, MT

Built 2008 Load: 25.6 t ADT: 25

NO DATA ENTERED

Good

Over: BENDER CR.

NO DATA ENTERED, Beaverhead, MT

Built 2002 Load: 25.9 t ADT: 10

FOREST ROAD

Good

Over: TRAIL CREEK

TRAIL CREEK, Flathead, MT

Built 1981 Load: 25.9 t ADT: 10

NFSR #251

Good

Over: DRY WOLF CREEK

15 MI. SW OF STANFORD, Judith Basin, MT

Built 1994 Load: 25.9 t ADT: 40

FOREST ROAD

Good

Over: CREEK

NORTH FORK LOST CREEK, Lake, MT

Built 2005 Load: 25.9 t ADT: 30

NFSR 330

Good

Over: COPPER CREEK

COPPER CREEK, Lewis and Clark, MT

Built 2008 Load: 25.9 t ADT: 169

I 15

Good

Over: LITTLE PRICKLY PEAR CR

9M S WOLF CREEK, Lewis and Clark, MT

Built 1965 Load: 25.9 t ADT: 2,383

NO DATA ENTERED

Good

Over: WEST FORK DRY CREEK

W FK DRY CR, Sanders, MT

Built 1992 Load: 25.9 t ADT: 40

NO DATA ENTERED

Good

Over: FISH CR

PAST PIGION CREEK CG, Silver Bow, MT

Built 1986 Load: 25.9 t ADT: 40

NFSR 8840

Good

Over: N.F. HIGHWOOD

NO DATA ENTERED, Chouteau, MT

Built 2001 Load: 26.2 t ADT: 40

NFSR 8840

Good

Over: N.F. HIGHWOOD CREEK

NO DATA ENTERED, Chouteau, MT

Built 2001 Load: 26.2 t ADT: 40

ROAD 4209

Good

Over: NORTH CREEK

NORTH CREEK, Missoula, MT

Built 2008 Load: 26.2 t ADT: 40

BREWER RD

Good

Over: TIMBER CREEK 017

2M E POWDERVILLE, Powder River, MT

Built 1996 Load: 26.2 t ADT: 100

BLACK BRIDGE RD

Good

Over: LITTLE BIGHORN RIVER 024

3M SW WYOLA, Big Horn, MT

Built 1998 Load: 26.3 t ADT: 100

SARPY CREEK RD

Good

Over: TULLOCK CREEK

16M E HARDIN, Big Horn, MT

Built 1968 Load: 26.3 t ADT: 199

COUNTY ROAD 007

Good

Over: MILK RIVER 014

1M N LOHMAN, Blaine, MT

Built 1997 Load: 26.3 t ADT: 125

US 2

Good

Over: BATTLE CREEK-N FK MILK R

3M W ZURICH, Blaine, MT

Built 1999 Load: 26.3 t ADT: 2,067

S 72

Good

Over: SILVER TIP CREEK

3M N BELFRY, Carbon, MT

Built 2011 Load: 26.3 t ADT: 1,722

S 308

Good

Over: ROCK CREEK

RED LODGE, Carbon, MT

Built 2003 Load: 26.3 t ADT: 1,246

ISMAY RD

Good

Over: O`FALLON CREEK 002

20M NW EKALAKA, Carter, MT

Built 1994 Load: 26.3 t ADT: 100

Showing 3,651-3,700 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.