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

I 15

Good

Over: BEAVERHEAD RIVER

8M N CLARK CANYON DAM, Beaverhead, MT

Built 1965 Load: 29.0 t ADT: 2,210

US 2

Good

Over: RED ROCK EAST OVERFLOW

1M W CHINOOK, Blaine, MT

Built 2020 Load: 29.0 t ADT: 2,637

US 89 FH 32

Good

Over: BELT CREEK

1M N NEIHART, Cascade, MT

Built 1951 Load: 29.0 t ADT: 448

US 89 FH 32

Good

Over: BELT CREEK

3M N NEIHART, Cascade, MT

Built 1967 Load: 29.0 t ADT: 448

US 89 FH 32

Good

Over: BELT CREEK

7M S BELT, Cascade, MT

Built 1968 Load: 29.0 t ADT: 1,144

FRONTAGE ROAD 315

Good

Over: DRAINAGE 086

6M E GLENDIVE, Dawson, MT

Built 2019 Load: 29.0 t ADT: 114

S 43

Good

Over: FISHTRAP CREEK

16M NW WISE RIVER, Deer Lodge, MT

Built 1941 Load: 29.0 t ADT: 454

STAFFORD FERRY RD

Good

Over: TAFFY CREEK

7M N WINIFRED, Fergus, MT

Built 2020 Load: 29.0 t ADT: 167

S 547

Good

Over: WOLF CREEK

1M E DENTON, Fergus, MT

Built 1977 Load: 29.0 t ADT: 136

SOMERS STAGE RD

Good

Over: ASHLEY CREEK 002

4M SE KALISPELL, Flathead, MT

Built 2004 Load: 29.0 t ADT: 100

S 200

Good

Over: CALF CREEK

11M NE MOSBY, Garfield, MT

Built 1968 Load: 29.0 t ADT: 532

US 87

Good

Over: DAWKINS BRANCH

5.271M E HOBSON, Judith Basin, MT

Built 2021 Load: 29.0 t ADT: 3,167

FLAT CREEK RD

Good

Over: FLAT CREEK 134

8M NE BEAN LAKE, Lewis and Clark, MT

Built 2006 Load: 29.0 t ADT: 38

STEMPLE PASS RD

Good

Over: POORMAN CREEK 147

9M S LINCOLN, Lewis and Clark, MT

Built 2004 Load: 29.0 t ADT: 95

STEMPLE PASS RD

Good

Over: POORMAN CREEK 148

10M S LINCOLN, Lewis and Clark, MT

Built 2004 Load: 29.0 t ADT: 95

S MUSSELSHELL RD

Good

Over: MUSSELSHELL RIVER

MUSSELSHELL, Musselshell, MT

Built 1960 Load: 29.0 t ADT: 156

FRANCES HEIGHTS RD

Good

Over: CANAL 033

4M SW VALIER, Pondera, MT

Built 2009 Load: 29.0 t ADT: 100

PENDROY RD

Good

Over: DRAINAGE

3M SW CONRAD, Pondera, MT

Built 2003 Load: 29.0 t ADT: 648

MOBLEY RD

Good

Over: MIZPAH CREEK 019

7M NE OLIVE, Powder River, MT

Built 2014 Load: 29.0 t ADT: 100

US 93 FH 19

Good

Over: TIN CUP CREEK

1M S DARBY, Ravalli, MT

Built 1990 Load: 29.0 t ADT: 3,589

IRR - S 200

Good

Over: MAGPIE CREEK

5M SE PERMA, Sanders, MT

Built 1986 Load: 29.0 t ADT: 1,943

BEAVER CREEK RD

Good

Over: BEAVER CREEK 008

11M N REDSTONE, Sheridan, MT

Built 1993 Load: 29.0 t ADT: 100

GERMAN GULCH RD

Good

Over: RR 012

W SILVERBOW, Silver Bow, MT

Built 2014 Load: 29.0 t ADT: 100

S 78

Good

Over: BUTCHER CREEK

2M S ABSAROKEE, Stillwater, MT

Built 2010 Load: 29.0 t ADT: 1,887

SOURDOUGH RD

Good

Over: SWEET GRASS CREEK 027

13M NE BIG TIMBER, Sweet Grass, MT

Built 1997 Load: 29.0 t ADT: 100

US 89

Good

Over: GREENFIELDS MAIN CANAL

1M SE FAIRFIELD, Teton, MT

Built 1983 Load: 29.0 t ADT: 1,787

OLD HWY 10

Good

Over: SARPY CREEK 014

5M E HYSHAM, Treasure, MT

Built 2015 Load: 29.0 t ADT: 218

DUCK CREEK RD

Good

Over: DUCK CREEK 021

SW BILLINGS, Yellowstone, MT

Built 1992 Load: 29.0 t ADT: 100

HILLBROOKE AVE

Good

Over: BIG DITCH 198

LAUREL-HILLBROOKE AVE, Yellowstone, MT

Built 2006 Load: 29.0 t ADT: 100

US 87

Good

Over: WEST FORK RAZOR CREEK

21M S KLEIN, Yellowstone, MT

Built 1995 Load: 29.0 t ADT: 2,497

FOREST ROAD

Good

Over: JIM CREEK

PECK LAKE ROAD, Lake, MT

Built 2016 Load: 29.2 t ADT: 50

NFSR 233

Good

Over: W FK BEAVER CREEK

BEAVER CREEK NO. 3, Lewis and Clark, MT

Built 1978 Load: 29.2 t ADT: 26

SNOW SHOE CR RD

Good

Over: LITTLE BLACKFOOT R 017

3M E AVON, Powell, MT

Built 2001 Load: 29.2 t ADT: 46

NO DATA ENTERED

Good

Over: LITTLE WEST FORK CR

NO DATA ENTERED, Ravalli, MT

Built 1990 Load: 29.2 t ADT: 50

COTTONWOOD CR RD

Good

Over: COTTONWOOD CREEK 140

9M SW LEWISTOWN, Fergus, MT

Built 2013 Load: 29.5 t ADT: 45

COTTONWOOD CUTOFF

Good

Over: COTTONWOOD CREEK 025

6M SW LEWISTOWN, Fergus, MT

Built 2012 Load: 29.5 t ADT: 100

FOREST ROAD

Good

Over: NICOLA CREEK

UPPER BIG CREEK AREA, Flathead, MT

Built 2004 Load: 29.5 t ADT: 40

AIRPORT RD

Good

Over: FERRIS DITCH

2M E BELGRADE, Gallatin, MT

Built 2022 Load: 29.5 t ADT: 3,662

N SANDIN RANCH LN

Good

Over: MIDDLE FORK ROCK CR 032

15M SW PHILLIPSBURG, Granite, MT

Built 2004 Load: 29.5 t ADT: 273

FOREST ROAD

Good

Over: PIPER CREEK

PIPER CREEK ROAD, Lake, MT

Built 2015 Load: 29.5 t ADT: 40

RD 231

Good

Over: LIBBY CR

LIBBY CR, Lincoln, MT

Built 1984 Load: 29.5 t ADT: 99

NFSR

Good

Over: SMITH CREEK

CONDON, Missoula, MT

Built 2010 Load: 29.5 t ADT: 40

01017: CROOKED CRE

Good

Over: Gypsum Creek

9 mi N of Cowley WY, Carbon, MT

Built 2010 Load: 29.8 t ADT: 25

FOREST ROAD

Good

Over: UPPER TWIN CR

CABLE CAR SLIDE AREA, Flathead, MT

Built 1965 Load: 29.8 t ADT: 120

QUAINTANCE LN

Good

Over: BOULDER DITCH 029

13M SE BOULDER, Jefferson, MT

Built 2010 Load: 29.8 t ADT: 100

QUARTZ CREEK RD

Good

Over: BIG FOOT CREEK

BIG FOOT CREEK, Lincoln, MT

Built 2015 Load: 29.8 t ADT: 40

NFSR 274

Good

Over: SPRING CREEK

SPRING CREEK 2, Meagher, MT

Built 1996 Load: 29.8 t ADT: 50

NO DATA ENTERED

Good

Over: MCCORMICK CR

MCCORMICK CR, Missoula, MT

Built 1973 Load: 29.8 t ADT: 40

ROUTE 4106

Good

Over: THEODORE

NO DATA ENTERED, Powell, MT

Built 2015 Load: 29.8 t ADT: 40

EKBLAD ROAD

Good

Over: HOT SPRINGS CREEK 101

NE HOT SPRINGS, Sanders, MT

Built 2010 Load: 29.8 t ADT: 100

Showing 3,851-3,900 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.