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

MULLAN RD E

Good

Over: FLINT CREEK OVERFLOW 084

2M S DRUMMOND, Granite, MT

Built 1998 Load: 28.1 t ADT: 100

ECHO RD

Good

Over: ROSS FORK CREEK 017

10M N GARNEILL, Judith Basin, MT

Built 1993 Load: 28.1 t ADT: 100

LITTLE WOLF CR RD

Good

Over: WOLF CREEK 112

4M NW WOLF CREEK, Lewis and Clark, MT

Built 2010 Load: 28.1 t ADT: 128

FRONTAGE ROAD 241

Good

Over: LITTLE PRICKLY PEAR 059

WOLF CREEK, Lewis and Clark, MT

Built 1966 Load: 28.1 t ADT: 707

STEMPLE PASS RD

Good

Over: POORMAN CREEK 140

4M S LINCOLN, Lewis and Clark, MT

Built 2007 Load: 28.1 t ADT: 95

SPRING CREEK LN

Good

Over: SPRING CREEK 152

LINCOLN, Lewis and Clark, MT

Built 2010 Load: 28.1 t ADT: 100

BEAR CREEK LOOP

Good

Over: INDIAN CREEK 043

21M S ENNIS, Madison, MT

Built 2001 Load: 28.1 t ADT: 77

MELSTONE-CUSTER RD

Good

Over: MUSSELSHELL RIVER 017

1M SE MELSTONE, Musselshell, MT

Built 1992 Load: 28.1 t ADT: 115

S 21

Good

Over: RR

CONRAD, Pondera, MT

Built 1972 Load: 28.1 t ADT: 1,604

I 90

Good

Over: LITTLE BLACKFOOT RIVER

1.2M S GARRISON, Powell, MT

Built 1979 Load: 28.1 t ADT: 5,165

7TH ST

Good

Over: USBR MAIN CANAL 093

SW EDGE FAIRVIEW 7TH ST, Richland, MT

Built 2019 Load: 28.1 t ADT: 100

COUNTY ROAD 017

Good

Over: CHARLIE CREEK 046

45M NW SIDNEY, Richland, MT

Built 2021 Load: 28.1 t ADT: 100

COUNTY ROAD 001

Good

Over: E HARDSCRABBLE CREEK 040

33M NW SIDNEY, Richland, MT

Built 2007 Load: 28.1 t ADT: 100

COUNTY ROAD 127

Good

Over: USBR MAIN CANAL 053

2M N SIDNEY, Richland, MT

Built 2015 Load: 28.1 t ADT: 100

COUNTY ROAD 356

Good

Over: USBR MAIN CANAL 006

9M SW SAVAGE, Richland, MT

Built 1994 Load: 28.1 t ADT: 100

S 16

Good

Over: SHEEP CREEK

SOUTH EDGE FROID, Roosevelt, MT

Built 1970 Load: 28.1 t ADT: 879

US 12

Good

Over: DRAINAGE

8M NW FORSYTH, Rosebud, MT

Built 2012 Load: 28.1 t ADT: 226

COUNTY ROAD 215

Good

Over: TETON RIVER 067

3M NW CHOTEAU, Teton, MT

Built 1976 Load: 28.1 t ADT: 100

I 94

Good

Over: SARPY CREEK

18.6M E BIGHORN, Treasure, MT

Built 1967 Load: 28.1 t ADT: 2,489

BYAM RD

Good

Over: CLARKS FK YELLOWSTONE024

3M S LAUREL, Yellowstone, MT

Built 1997 Load: 28.1 t ADT: 288

MONTAQUA RD

Good

Over: ELBOW CREEK 048

3M SW EDGAR, Carbon, MT

Built 2007 Load: 28.2 t ADT: 100

NORTH FORK RD

Good

Over: TRAIL CREEK 050

13M NW POLEBRIDGE, Flathead, MT

Built 2010 Load: 28.2 t ADT: 59

FOREST ROAD

Good

Over: DOG CREEK

NO DATA ENTERED, Lake, MT

Built 2013 Load: 28.2 t ADT: 40

FOREST ROAD

Good

Over: NORTH FORK LOST CREEK

NORTH LOST, Lake, MT

Built 2015 Load: 28.2 t ADT: 40

BIRDSEYE RD

Good

Over: SEVEN MILE CREEK 034

6M NW HELENA, Lewis and Clark, MT

Built 2001 Load: 28.2 t ADT: 1,823

4402 SOUTHSIDE RD.

Good

Over: STAR CREEK

JUST BEFORE JCT WITH 415, Lincoln, MT

Built 1976 Load: 28.2 t ADT: 50

ROUTE 4106

Good

Over: KLONDIKE CREEK

NO DATA ENTERED, Powell, MT

Built 2013 Load: 28.2 t ADT: 40

NO DATA ENTERED

Good

Over: ROCK CR

NO DATA ENTERED, Sanders, MT

Built 1959 Load: 28.2 t ADT: 50

PARK RD

Good

Over: FIFTEEN MILE CREEK 020

1M N ZURICH, Blaine, MT

Built 1958 Load: 28.5 t ADT: 100

FOREST ROAD

Good

Over: EMERY CREEK

DESERT MTN TIE ROAD, Flathead, MT

Built 1983 Load: 28.5 t ADT: 10

IRR BIA RTE 4

Good

Over: FOUR HORNS CANAL

8.1 KM N OF HEART BUTTE, Glacier, MT

Built 1972 Load: 28.5 t ADT: 500

4638: SCOTCHMAN GU

Good

Over: UPPER WILLOW CREEK

14 mi W of MT1/US10A, Granite, MT

Built 1980 Load: 28.5 t ADT: 25

I 15

Good

Over: STICKNEY CREEK

2M N CRAIG, Lewis and Clark, MT

Built 1968 Load: 28.5 t ADT: 2,224

5857 FRENCH GARVER

Good

Over: W FK YAAK R.

.1 MILE FROM JCT W/276, Lincoln, MT

Built 1961 Load: 28.5 t ADT: 30

FOREST ROAD

Good

Over: NORTH FORK COLD CREEK

NORTH FORK COLD CREEK, Missoula, MT

Built 2012 Load: 28.5 t ADT: 40

BILLY GOAT ROAD

Good

Over: SMITH CREEK

NO DATA ENTERED, Park, MT

Built 2011 Load: 28.5 t ADT: 40

N 17TH RD

Good

Over: ARROW CREEK 148

NE WORDEN, Yellowstone, MT

Built 1983 Load: 28.5 t ADT: 100

DEER MEADOW DR

Good

Over: TEN MILE CREEK 130

10M SW HELENA, Lewis and Clark, MT

Built 2006 Load: 28.6 t ADT: 100

ROCK CREEK ROAD

Good

Over: BIG HOLE RIVER 077

3M SW WISDOM, Beaverhead, MT

Built 2021 Load: 28.8 t ADT: 100

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Beaverhead, MT

Built 2009 Load: 28.8 t ADT: 40

NFSR 8841

Good

Over: NORTH FORK HIGHWOOD CR.

0.9 MILES E. OF RD.121, Chouteau, MT

Built 2007 Load: 28.8 t ADT: 40

NO DATA ENTERED

Good

Over: WERNER CREEK

HALLOWAT CREEK ROAD, Flathead, MT

Built 2004 Load: 28.8 t ADT: 40

SYSTEM ROAD

Good

Over: FATTY CREEK

FATTY PIPER CONNECTOR, Lake, MT

Built 2013 Load: 28.8 t ADT: 40

FLAT CREEK RD

Good

Over: FLAT CREEK 017

5M NE BEAN LAKE, Lewis and Clark, MT

Built 2007 Load: 28.8 t ADT: 38

RD 6823

Good

Over: WOLF CR

JCT W/RD 36 MP 3.55, Lincoln, MT

Built 1990 Load: 28.8 t ADT: 40

FDR #100

Good

Over: RUBY RIVER

JUST SOUTH OF VIGILANTE G, Madison, MT

Built 1999 Load: 28.8 t ADT: 50

FOREST ROAD

Good

Over: BEAVER CREEK

BEAVER CREEK ROAD, Missoula, MT

Built 2015 Load: 28.8 t ADT: 40

I 90

Good

Over: PETERSON CREEK

5M W SPRINGDALE, Park, MT

Built 1987 Load: 28.8 t ADT: 5,692

NO DATA ENTERED

Good

Over: THREE MILE CREEK

NO DATA ENTERED, Ravalli, MT

Built 2007 Load: 28.8 t ADT: 40

S 556-THOMPSON R R

Good

Over: BIG ROCK CREEK

35M SW MARION, Sanders, MT

Built 2009 Load: 28.8 t ADT: 55

Showing 3,801-3,850 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.