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

LITTLE MISSOURI RD

Good

Over: SAND CREEK 015

2M N CAPITOL, Carter, MT

Built 2015 Load: 20.9 t ADT: 42

LOWREY RD

Good

Over: FORT SHAW CANAL 061

5M NW SIMMS, Cascade, MT

Built 2001 Load: 20.9 t ADT: 100

ANDREWS ROAD

Good

Over: DOG CREEK

2M N CHRISTINA, Fergus, MT

Built 2019 Load: 20.9 t ADT: 100

DALBERG SIDING RD

Good

Over: TOBACCO RIVER 134

3M NW FORTINE, Lincoln, MT

Built 1993 Load: 20.9 t ADT: 266

DOVETAIL VALENTINE

Good

Over: BOX ELDER CREEK 007

6M N WINNETT, Petroleum, MT

Built 1982 Load: 20.9 t ADT: 100

E I RD

Good

Over: HUNTLEY MAIN CANAL 144

2M NE BALLANTINE, Yellowstone, MT

Built 2004 Load: 20.9 t ADT: 100

12 MILE RD

Good

Over: CROOKED CREEK 089

4M NW SHEPHERD, Yellowstone, MT

Built 2010 Load: 20.9 t ADT: 100

NO DATA ENTERED

Good

Over: E F BITTERROOT

NO DATA ENTERED, Ravalli, MT

Built 1947 Load: 21.1 t ADT: 10

S 4TH RD

Good

Over: HUNTLEY MAIN CANAL 146

1M NE HUNTLEY, Yellowstone, MT

Built 1986 Load: 21.1 t ADT: 79

KLOCK RD

Good

Over: CASTNER COULEE 096

CASTNER FALLS, Cascade, MT

Built 1938 Load: 21.4 t ADT: 100

FOREST ROAD

Good

Over: NORTH FORK SPRING FLOW

WURTZ FLATS, Flathead, MT

Built 1997 Load: 21.4 t ADT: 5

JOCKO CANYON RD

Good

Over: JOCKO RIVER 013

9M E ARLEE, Lake, MT

Built 1930 Load: 21.4 t ADT: 100

RIMINI RD

Good

Over: TEN MILE CREEK 101

11M W HELENA, Lewis and Clark, MT

Built 2015 Load: 21.4 t ADT: 230

RD 6212

Good

Over: POORMAN CREEK

LITTLE CHERRY LOOP, Lincoln, MT

Built 1998 Load: 21.4 t ADT: 40

GRANITE CREEK RD

Good

Over: BIG CHERRY CREEK 119

5M SW LIBBY, Lincoln, MT

Built 1977 Load: 21.4 t ADT: 263

BIG PORCUPINE RD

Good

Over: BIG PORCUPINE CREEK 011

8M N VANANDA, Rosebud, MT

Built 2006 Load: 21.4 t ADT: 12

REUM RD

Good

Over: BEAVER CREEK 028

14M S HAVRE, Hill, MT

Built 2003 Load: 21.7 t ADT: 100

NFSR

Good

Over: PONY CREEK

CONDON AREA, Lake, MT

Built 2008 Load: 21.7 t ADT: 40

NO DATA ENTERED

Good

Over: COTTONWOOD CR

NO DATA ENTERED, Madison, MT

Built 2003 Load: 21.7 t ADT: 10

7TH LN

Good

Over: MILL COULEE CANAL 093

7M E FAIRFIELD, Cascade, MT

Built 1950 Load: 21.8 t ADT: 100

S 556-THOMPSON R R

Good

Over: MCGREGOR CREEK

18M SW MARION, Flathead, MT

Built 1992 Load: 21.8 t ADT: 60

BREEZE WAY ROAD

Good

Over: WILLOW CREEK 016

2M S WILLOW CREEK, Gallatin, MT

Built 2019 Load: 21.8 t ADT: 985

EMIGRANT GAP RD

Good

Over: ST MARY CANAL 046

35M N BROWNING, Glacier, MT

Built 1991 Load: 21.8 t ADT: 960

US 87

Good

Over: ROSS FORK CREEK

3M E HOBSON, Judith Basin, MT

Built 1971 Load: 21.8 t ADT: 3,167

BUFFALO BRIDGE RD

Good

Over: FLATHEAD RIVER 084

10M W POLSON, Lake, MT

Built 1993 Load: 21.8 t ADT: 100

SKYLINE DR

Good

Over: PABLO 3A CANAL 038

4M S POLSON, Lake, MT

Built 2013 Load: 21.8 t ADT: 100

CALIFORNIA AVE

Good

Over: KOOTENAI RIVER

LIBBY-CALIFORNIA AVE, Lincoln, MT

Built 1959 Load: 21.8 t ADT: 5,568

US HWY 12

Good

Over: MUSSELSHELL RIVER

2M NE MELSTONE, Rosebud, MT

Built 2019 Load: 21.8 t ADT: 240

I 94

Good

Over: SARPY CREEK

18.6M E BIGHORN, Treasure, MT

Built 1976 Load: 21.8 t ADT: 2,067

SPORTSMAN PARK RD

Good

Over: DRAINAGE

5M SW LAUREL, Yellowstone, MT

Built 2019 Load: 21.8 t ADT: 100

BENCH BLVD

Good

Over: ALKALI CREEK

BILLINGS-BENCH BLVD, Yellowstone, MT

Built 2011 Load: 21.8 t ADT: 12,241

MILL CREEK ROAD

Good

Over: MILL CREEK

S. OF LIVINGSTON, Park, MT

Built 1971 Load: 22.0 t ADT: 99

COUNTY ROAD 332

Good

Over: BEEF SLOUGH 095

3M S SAVAGE, Richland, MT

Built 1991 Load: 22.0 t ADT: 100

NO DATA ENTERED

Good

Over: WILLOW CREEK

NO DATA ENTERED, Carbon, MT

Built 2010 Load: 22.4 t ADT: 40

331 RABBIT/OBRIEN

Good

Over: OBRIEN CR

JUST BEFORE JCT WITH 752, Lincoln, MT

Built 1979 Load: 22.4 t ADT: 20

FOREST ROAD

Good

Over: KRAFT CREEK

KRAFT CREEK ROAD, Missoula, MT

Built 2004 Load: 22.4 t ADT: 40

I 15

Good

Over: BEAVERHEAD RIVER

5M N CLARK CANYON DAM, Beaverhead, MT

Built 1980 Load: 22.7 t ADT: 2,836

LITTLE MISSOURI RD

Good

Over: DRAINAGE 010

11M SW CAPITOL, Carter, MT

Built 2013 Load: 22.7 t ADT: 42

COUNTY ROAD 319

Good

Over: USBR MAIN CANAL 071

INTAKE, Dawson, MT

Built 1991 Load: 22.7 t ADT: 31

MERIWETHER RD

Good

Over: COBELLE COULEE

13M NE BLACKFOOT, Glacier, MT

Built 1959 Load: 22.7 t ADT: 156

NFSR

Good

Over: CAT CREEK

CONDON AREA, Lake, MT

Built 2008 Load: 22.7 t ADT: 40

NFSR 233

Good

Over: W FK BEAVER CREEK

BEAVER CREEK NO. 2, Lewis and Clark, MT

Built 1978 Load: 22.7 t ADT: 26

WYLIE DR

Good

Over: PRICKLY PEAR CREEK 080

1M N EAST HELENA, Lewis and Clark, MT

Built 1958 Load: 22.7 t ADT: 4,312

STEMPLE PASS RD

Good

Over: POORMAN CREEK 153

3M S LINCOLN, Lewis and Clark, MT

Built 2009 Load: 22.7 t ADT: 299

CHERRY CREEK RD

Good

Over: CHERRY CREEK 052

9M NE NORRIS, Madison, MT

Built 2009 Load: 22.7 t ADT: 100

UPHAM GULCH RD

Good

Over: CEDAR CREEK 051

4M S SUPERIOR, Mineral, MT

Built 2005 Load: 22.7 t ADT: 313

DIAMOND MATCH RD

Good

Over: CEDAR CREEK

1M SE SUPERIOR, Mineral, MT

Built 1955 Load: 22.7 t ADT: 703

SOLLID RD

Good

Over: PONDERA COULEE

1M E CONRAD, Pondera, MT

Built 1971 Load: 22.7 t ADT: 569

I 94

Good

Over: ARMELLS CR-RR

6M W FORSYTH, Rosebud, MT

Built 1967 Load: 22.7 t ADT: 2,138

IRR - S 200

Good

Over: REVAIS CREEK

3M W DIXON, Sanders, MT

Built 1989 Load: 22.7 t ADT: 1,943

Showing 3,501-3,550 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.