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

IRR BIA RTE 34

Good

Over: BOX ELDER CREEK

2.1 KM WEST OF POPLAR, Roosevelt, MT

Built 1997 Load: 30.3 t ADT: 250

MARSHALL LAKE RD

Good

Over: W FK CLEARWATER

MARSHALL LK, Missoula, MT

Built 2008 Load: 30.5 t ADT: 50

BANNOCK TRAIL

Good

Over: WYOMING CREEK

1M E SILVER GATE, Park, MT

Built 2022 Load: 30.5 t ADT: 100

PLEASANT VIEW DR

Good

Over: SWEATHOUSE CREEK 002

1M W VICTOR, Ravalli, MT

Built 2009 Load: 30.5 t ADT: 100

SLEEPING CHILD RD

Good

Over: TWO BEAR CREEK 110

9M NE DARBY, Ravalli, MT

Built 2010 Load: 30.5 t ADT: 347

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Sanders, MT

Built 2010 Load: 30.5 t ADT: 50

ROCK CREEK ROAD

Good

Over: BIG HOLE RIVER 077

3M SW WISDOM, Beaverhead, MT

Built 2021 Load: 30.8 t ADT: 100

OLD HWY 87

Good

Over: PERITSA CREEK

6M W HARDIN, Big Horn, MT

Built 2020 Load: 30.8 t ADT: 561

IRR - S 451

Good

Over: PASS CREEK

3M S WYOLA, Big Horn, MT

Built 1949 Load: 30.8 t ADT: 297

S 396-SAVOY RD

Good

Over: SAVOY CREEK

2M SE SAVOY, Blaine, MT

Built 1990 Load: 30.8 t ADT: 5

LUTHER ROSCOE ROAD

Good

Over: BUTCHER CREEK

3.5M NW LUTHER, Carbon, MT

Built 2014 Load: 30.8 t ADT: 100

Chicago AVE

Good

Over: Russell Creek

Ekalaka-Chicago AVE, Carter, MT

Built 2019 Load: 30.8 t ADT: 477

CAPITOL RD

Good

Over: LITTLE MISSOURI RIV 014

E CAPITOL, Carter, MT

Built 2003 Load: 30.8 t ADT: 100

MEYER AVE

Good

Over: SAND COULEE CREEK 081

1M S TRACY, Cascade, MT

Built 1950 Load: 30.8 t ADT: 100

US 89

Good

Over: GREENFIELDS SOUTH CANAL

5M E FAIRFIELD, Cascade, MT

Built 1960 Load: 30.8 t ADT: 1,747

S 200

Good

Over: MILL COULEE CREEK

1M NE SUN RIVER, Cascade, MT

Built 1996 Load: 30.8 t ADT: 2,418

US 89 FH 32

Good

Over: BELT CREEK

6M S BELT, Cascade, MT

Built 1968 Load: 30.8 t ADT: 702

US 12

Good

Over: BENSLEY CREEK

6M E MILES CITY, Custer, MT

Built 1999 Load: 30.8 t ADT: 643

US 87

Good

Over: ROCK CREEK

2M NE MOORE, Fergus, MT

Built 2021 Load: 30.8 t ADT: 2,202

FARREN HILL ROAD

Good

Over: MIDDLE FORK BEAVER CR

6.1M S GLENGARRY, Fergus, MT

Built 2021 Load: 30.8 t ADT: 100

TOGNETTI RD

Good

Over: JUDITH RIVER 037

6M NW MOORE, Fergus, MT

Built 1995 Load: 30.8 t ADT: 100

BAXTER LANE E

Good

Over: HYALITE CREEK

5M W BOZEMAN, Gallatin, MT

Built 2019 Load: 30.8 t ADT: 4,679

GOOCH HILL ROAD

Good

Over: HYALITE CREEK 050

5M S BOZEMAN, Gallatin, MT

Built 2016 Load: 30.8 t ADT: 100

S 200

Good

Over: L-S CREEK

14M E JORDAN, Garfield, MT

Built 2016 Load: 30.8 t ADT: 469

S BARBER RD

Good

Over: MUSSELSHELL RIVER 023

BARBER-S BARBER RD, Golden Valley, MT

Built 1983 Load: 30.8 t ADT: 49

STREAM

Good

Over: SOUTH MISSION RESERVIOR

6 MILES EAST ST IGNATIUS, Lake, MT

Built 2019 Load: 30.8 t ADT: 100

NFSR 330-A1

Good

Over: SNOWBANK CREEK

COPPER CREEK AREA, Lewis and Clark, MT

Built 2013 Load: 30.8 t ADT: 40

S 200

Good

Over: ALICE CREEK

9M NE LINCOLN, Lewis and Clark, MT

Built 2014 Load: 30.8 t ADT: 1,761

GRAVE CREEK ROAD

Good

Over: CLARENCE CR

CLARENCE CR, Lincoln, MT

Built 1981 Load: 30.8 t ADT: 40

RD 228

Good

Over: BRISTOW CR

BRISTOW CREEK, Lincoln, MT

Built 1969 Load: 30.8 t ADT: 99

KOOTENAI RIVER RD

Good

Over: QUARTZ CREEK 037

6M NW LIBBY, Lincoln, MT

Built 1987 Load: 30.8 t ADT: 456

GOLD RIDGE ROAD

Good

Over: GOLD CREEK

NO DATA ENTERED, Missoula, MT

Built 2013 Load: 30.8 t ADT: 40

BOY SCOUT RD

Good

Over: CLEARWATER RIVER 083

4M NW SEELEY LAKE, Missoula, MT

Built 1964 Load: 30.8 t ADT: 100

AIRPORT RD

Good

Over: MORRELL CREEK 092

1M E SEELEY LAKE, Missoula, MT

Built 2009 Load: 30.8 t ADT: 100

US 87

Good

Over: MUSSELSHELL RIVER

ROUNDUP, Musselshell, MT

Built 1996 Load: 30.8 t ADT: 2,677

US 87

Good

Over: SOUTH WILLOW CREEK

7M N ROUNDUP, Musselshell, MT

Built 1976 Load: 30.8 t ADT: 1,155

I 90

Good

Over: MISSION CREEK-INT RAMP

9.9M E LIVINGSTON, Park, MT

Built 1987 Load: 30.8 t ADT: 53

MESSENGER RD

Good

Over: DRY FK MARIAS RIVER 073

2M S WILLIAMS, Pondera, MT

Built 1988 Load: 30.8 t ADT: 12

PREPUTIN RD

Good

Over: PONDERA COULEE 011

16M NE BRADY, Pondera, MT

Built 1960 Load: 30.8 t ADT: 100

US 89

Good

Over: DUPUYER CREEK OVERFLOW

1M N DUPUYER, Pondera, MT

Built 1968 Load: 30.8 t ADT: 508

US 93

Good

Over: CORVALLIS CANAL

1M N HAMILTON, Ravalli, MT

Built 1980 Load: 30.8 t ADT: 18,360

S 23

Good

Over: BENNIE PEER CREEK

7M SE SIDNEY, Richland, MT

Built 1986 Load: 30.8 t ADT: 696

NO DATA ENTERED

Good

Over: FISHTRAP CREEK

NO DATA ENTERED, Sanders, MT

Built 2009 Load: 30.8 t ADT: 40

VERMILION RIV RD

Good

Over: LYONS CREEK 032

7M E TROUT CREEK, Sanders, MT

Built 1900 Load: 30.8 t ADT: 100

IRR - S 212

Good

Over: JOCKO RIVER

1M E DIXON, Sanders, MT

Built 1949 Load: 30.8 t ADT: 917

CENTENNIAL RD

Good

Over: KEYSER CREEK 043

NW EDGE COLUMBUS, Stillwater, MT

Built 2005 Load: 30.8 t ADT: 100

LOWER SWEET GRASS

Good

Over: SWEET GRASS CREEK 039

10M E BIG TIMBER, Sweet Grass, MT

Built 1965 Load: 30.8 t ADT: 100

TETON CANYON RD

Good

Over: BYNUM RESEVOIR CANAL 002

15M W CHOTEAU, Teton, MT

Built 1982 Load: 30.8 t ADT: 154

US 2

Good

Over: N FORK WILLOW CREEK

1M SW GALATA, Toole, MT

Built 1989 Load: 30.8 t ADT: 899

JELLISON RD

Good

Over: BLUE CREEK 127

2M SE BILLINGS, Yellowstone, MT

Built 1993 Load: 30.8 t ADT: 100

Showing 3,951-4,000 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.