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 87

Fair

Over: OTTER CREEK

5M SE BELT, Cascade, MT

Built 1959 Load: 50.8 t ADT: 1,078

N KENDRICK AVENUE

Fair

Over: GRAVEYARD COULEE 093

GLENDIVE-N KENDRICK AVE, Dawson, MT

Built 1965 Load: 50.8 t ADT: 1,524

MEADE AVENUE

Fair

Over: GRAVEYARD COULEE 094

GLENDIVE-MEADE AVE, Dawson, MT

Built 1965 Load: 50.8 t ADT: 851

US 12

Fair

Over: SANDSTONE CREEK

EAST EDGE PLEVNA, Fallon, MT

Built 1998 Load: 50.8 t ADT: 749

FDR 235

Fair

Over: BENCHMARK CR.

BENCHMARK CR., Judith Basin, MT

Built 1993 Load: 50.9 t ADT: 40

GEER RD

Fair

Over: E FK PORCUPINE CREEK 002

20M N NASHUA, Valley, MT

Built 1960 Load: 50.9 t ADT: 100

LOWER RD

Fair

Over: MUSTER CREEK 001

1M SW KINSEY, Custer, MT

Built 1994 Load: 51.7 t ADT: 100

RD 36

Fair

Over: BN RAILROAD

WOLF CREEK MP 24.3, Lincoln, MT

Built 1968 Load: 51.8 t ADT: 99

SNOWLINE LN

Fair

Over: ASHLEY CREEK 168

3M SE KALISPELL, Flathead, MT

Built 2003 Load: 52.6 t ADT: 100

IRR BIA RTE 7

Fair

Over: POPLAR RIVER

2 KM S OF POPLAR, Roosevelt, MT

Built 2002 Load: 52.6 t ADT: 481

I 90

Fair

Over: SPRING CREEK

1M NW GREYCLIFF, Sweet Grass, MT

Built 1980 Load: 52.6 t ADT: 12,830

S 59

Fair

Over: PUMPKIN CREEK

14M SE MILES CITY, Custer, MT

Built 1962 Load: 53.5 t ADT: 673

ROAD 261

Fair

Over: SAND CREEK 038

8M SW GLENDIVE, Dawson, MT

Built 1988 Load: 53.5 t ADT: 579

COUNTY ROAD 549

Fair

Over: S FORK BURNS CR 065

10M NW INTAKE, Dawson, MT

Built 1992 Load: 53.5 t ADT: 100

S 43

Fair

Over: SEYMOUR CREEK

12M NW WISE RIVER, Deer Lodge, MT

Built 2006 Load: 53.5 t ADT: 454

STAR MEADOW RD

Fair

Over: LOGAN CREEK 085

6M S OLNEY, Flathead, MT

Built 1992 Load: 53.5 t ADT: 100

S 69

Fair

Over: BOULDER RIVER

BOULDER, Jefferson, MT

Built 2003 Load: 53.5 t ADT: 2,960

TOM MINER CREEK RD

Fair

Over: TOM MINER CREEK

18M NW GARDINER, Park, MT

Built 2018 Load: 53.5 t ADT: 100

US 2

Fair

Over: WHATELY CREEK

6M SE GLASGOW, Valley, MT

Built 1987 Load: 53.5 t ADT: 2,100

LESLIE RD

Fair

Over: ELBOW CREEK 036

2M SW EDGAR, Carbon, MT

Built 1913 Load: 54.4 t ADT: 100

S 200

Fair

Over: MAXWELL COULEE

22M E JORDAN, Garfield, MT

Built 2012 Load: 54.4 t ADT: 469

FOREST ROAD

Fair

Over: GLACIER CREEK

ELK CREEK ROAD, Missoula, MT

Built 1981 Load: 55.4 t ADT: 10

NO DATA ENTERED

Fair

Over: DALY CR

NO DATA ENTERED, Ravalli, MT

Built 1947 Load: 56.1 t ADT: 45

ELK CREEK RD

Fair

Over: ELK CREEK 051

4M S HERON, Sanders, MT

Built 1988 Load: 56.2 t ADT: 100

I 15

Fair

Over: RR-LOCAL

BUTTE, Silver Bow, MT

Built 2012 Load: 56.2 t ADT: 6,807

FOREST ROAD

Fair

Over: LOGAN CREEK

TALLY LAKE ROAD, Flathead, MT

Built 1974 Load: 57.7 t ADT: 60

I 94

Fair

Over: GRAVEYARD CREEK

1M E HATHAWAY, Rosebud, MT

Built 1962 Load: 58.1 t ADT: 2,602

RD 386

Fair

Over: ST REGIS RIVER

BIG CR RD 386, Mineral, MT

Built 1972 Load: 58.3 t ADT: 50

STORY HILL RD

Fair

Over: ROCKY CREEK

2M E BOZEMAN, Gallatin, MT

Built 2005 Load: 58.6 t ADT: 100

LOWER RD

Fair

Over: COYOTE CREEK 085

1M SW DENTON, Fergus, MT

Built 1977 Load: 59.1 t ADT: 73

RD 4785

Fair

Over: BIG CHERRY CR

UPPER BIG CHERRY, Lincoln, MT

Built 1966 Load: 59.3 t ADT: 50

US 93

Fair

Over: MUD CREEK

4M N RONAN, Lake, MT

Built 2008 Load: 59.9 t ADT: 5,692

IRR BIA RTE 1015

Fair

Over: HICKS CREEK

26 KM EAST OF ARLEE, Missoula, MT

Built 2001 Load: 59.9 t ADT: 20

S 200

Fair

Over: DRAINAGE

6M E JORDAN, Garfield, MT

Built 2004 Load: 60.8 t ADT: 469

S 294

Fair

Over: MARTINSDALE SUPPLY CANAL

MARTINSDALE, Meagher, MT

Built 2010 Load: 60.8 t ADT: 276

PENDROY RD

Fair

Over: DRAINAGE

5M W CONRAD, Pondera, MT

Built 1955 Load: 60.8 t ADT: 480

US 93

Fair

Over: MUD CREEK

4M N RONAN, Lake, MT

Built 2007 Load: 63.5 t ADT: 5,692

US 287

Fair

Over: O`DELL CREEK

SE ENNIS, Madison, MT

Built 2001 Load: 63.5 t ADT: 4,210

COAL MINE RD

Fair

Over: FT. BELKNAP CANAL 01

5M NW CHINOOK, Blaine, MT

Built 1933 Load: 63.8 t ADT: 41

US 93

Fair

Over: WILDLIFE UNDERPASS

10M N WYE JCT, Missoula, MT

Built 2009 Load: 64.4 t ADT: 8,184

NORTH ENTRANCE ROA

Fair

Over: GARDNER RIVER

1.5 MI. SOUTH OF NORTH EN, Park, MT

Built 1957 Load: 64.4 t ADT: 2,294

US 2

Fair

Over: RICHARDSON COULEE

4M NW GLASGOW, Valley, MT

Built 1979 Load: 64.4 t ADT: 1,409

FOREST ROAD

Fair

Over: LOGAN CREEK

TALLY LAKE ROAD, Flathead, MT

Built 1976 Load: 64.5 t ADT: 60

IRR BIA RTE 127

Fair

Over: MILL POCKET-CAMAS CANAL

6.3KM NW OF NIARADA, Sanders, MT

Built 2004 Load: 65.3 t ADT: 10

NORTH LAKE MCDONAL

Fair

Over: CREEK

12.7 miles northeast of U, Flathead, MT

Built 2001 Load: 67.1 t ADT: 50

NORTH LAKE MCDONAL

Fair

Over: CREEK

12.7 miles northeast of U, Flathead, MT

Built 2001 Load: 67.1 t ADT: 50

NO DATA ENTERED

Fair

Over: WEST FORK SPRUCE CREEK

NO DATA ENTERED, Powell, MT

Built 2020 Load: 68.0 t ADT: 50

NO DATA ENTERED

Fair

Over: EF SPRUCE CREEK

NO DATA ENTERED, Powell, MT

Built 2020 Load: 69.0 t ADT: 50

US 87

Fair

Over: OTTER CREEK

1M SE RAYNESFORD, Judith Basin, MT

Built 1964 Load: 69.9 t ADT: 2,242

NO DATA ENTERED

Fair

Over: STORM LAKE CREEK

NO DATA ENTERED, Deer Lodge, MT

Built 2011 Load: 70.0 t ADT: 10

Showing 3,201-3,250 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.