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

WESTMORE RD

Good

Over: PENNEL CREEK 022

16M NW PLEVNA, Fallon, MT

Built 1991 Load: 27.2 t ADT: 20

US 87

Good

Over: DRAINAGE

7.125M E HOBSON, Fergus, MT

Built 2021 Load: 27.2 t ADT: 2,202

US 93 BYPASS

Good

Over: ASHLEY CREEK

SW KALISPELL, Flathead, MT

Built 2010 Load: 27.2 t ADT: 8,783

BOZEMAN TRAIL RD

Good

Over: BEAR CREEK

2M SE BOZEMAN, Gallatin, MT

Built 2019 Load: 27.2 t ADT: 776

BOZEMAN CREEK ROAD

Good

Over: BOZEMAN CREEK

S. OF BOZEMAN, Gallatin, MT

Built 1965 Load: 27.2 t ADT: 40

ROSS FORK ROAD

Good

Over: MIDDLE FORK ROCK CR 021

15M SW PHILLIPSBURG, Granite, MT

Built 1991 Load: 27.2 t ADT: 100

KERR DAM RD

Good

Over: IRRIGATION CANAL

2M SW POLSON, Lake, MT

Built 1995 Load: 27.2 t ADT: 2,099

BARR CREEK RD

Good

Over: N FORK WILLOW CREEK 125

9M NW AUGUSTA, Lewis and Clark, MT

Built 1991 Load: 27.2 t ADT: 100

FINDON LANE RD

Good

Over: N FK MUSSELSHELL 019

3M N MARTINSDALE, Meagher, MT

Built 2010 Load: 27.2 t ADT: 100

NF-581

Good

Over: S FORK MUSSELSHELL 026

LENNEP, Meagher, MT

Built 1987 Load: 27.2 t ADT: 100

DESCHAMPS LN

Good

Over: LAVALLE CREEK 022

8M NW MISSOULA, Missoula, MT

Built 2009 Load: 27.2 t ADT: 669

US 12 FH 11

Good

Over: LOLO CREEK

1M S LOLO HOT SPRINGS, Missoula, MT

Built 1951 Load: 27.2 t ADT: 746

US 87

Good

Over: RAZOR CREEK

16M S KLEIN, Musselshell, MT

Built 1995 Load: 27.2 t ADT: 2,497

S 500

Good

Over: NORTH WILLOW CREEK

13M SW MOSBY, Petroleum, MT

Built 1975 Load: 27.2 t ADT: 33

MIDALE RD

Good

Over: BIG WARM CREEK 045

22M S MALTA, Phillips, MT

Built 1995 Load: 27.2 t ADT: 100

I 15

Good

Over: PONDERA CANAL

9M N CONRAD, Pondera, MT

Built 1972 Load: 27.2 t ADT: 1,490

CHURCH RD S

Good

Over: PONDERA COULEE 005

20M NE BRADY, Pondera, MT

Built 1986 Load: 27.2 t ADT: 100

BELL CROSSING

Good

Over: BITTERROOT RIVER OVERFLO

2M NE VICTOR, Ravalli, MT

Built 1974 Load: 27.2 t ADT: 2,762

COUNTY RD 358

Good

Over: USBR MAIN CANAL 094

4M NE CRANE, Richland, MT

Built 2005 Load: 27.2 t ADT: 36

S 261

Good

Over: SHADWELL CREEK

19M S SIDNEY, Richland, MT

Built 1971 Load: 27.2 t ADT: 86

UPPER RESERVOIR RD

Good

Over: IRRIGATION CANAL 069

4M N LONEPINE, Sanders, MT

Built 1991 Load: 27.2 t ADT: 100

E LAKE HWY

Good

Over: LAKE CREEK 060

9M E MEDICINE LAKE, Sheridan, MT

Built 1965 Load: 27.2 t ADT: 108

S 5

Good

Over: ANTELOPE CREEK

2M S ANTELOPE, Sheridan, MT

Built 1986 Load: 27.2 t ADT: 1,125

SLEEPY HOLLOW RD

Good

Over: W ROSEBUD CREEK 032

11M SW ABSAROKEE, Stillwater, MT

Built 2004 Load: 27.2 t ADT: 100

MISSION VALLEY RD

Good

Over: FROZE TO DEATH CR 013

2M NW MYERS, Treasure, MT

Built 1986 Load: 27.2 t ADT: 9

YEOMAN RD

Good

Over: BBWA CANAL 094

4M SW SHEPHERD, Yellowstone, MT

Built 2010 Load: 27.2 t ADT: 100

OLD HARDIN RD

Good

Over: DRY CREEK 025

LOCKWOOD-OLD HARDIN RD, Yellowstone, MT

Built 1994 Load: 27.2 t ADT: 4,537

RIVEROAKS DR

Good

Over: BBWA CANAL 083

BILLINGS-RIVEROAKS DR, Yellowstone, MT

Built 1982 Load: 27.2 t ADT: 2,768

CANYON CR ROAD

Good

Over: CANYON CREEK

2ND BRIDGE ON CANYON CR, Flathead, MT

Built 1977 Load: 27.5 t ADT: 5

RD 4724

Good

Over: S FK MILLER CR

SOUTH FORK MILLER CREEK, Lincoln, MT

Built 1978 Load: 27.5 t ADT: 50

NO DATA ENTERED

Good

Over: BIG CREEK

BIG CR, Mineral, MT

Built 1951 Load: 27.5 t ADT: 40

NO DATA ENTERED

Good

Over: FLAT CREEK CREEK

NO DATA ENTERED, Mineral, MT

Built 2004 Load: 27.5 t ADT: 40

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Ravalli, MT

Built 2011 Load: 27.5 t ADT: 40

NO DATA ENTERED

Good

Over: WATCHTOWER CR

NO DATA ENTERED, Ravalli, MT

Built 1990 Load: 27.5 t ADT: 30

4TH ST

Good

Over: USBR MAIN CANAL 073

WEST EDGE FAIRVIEW-4TH ST, Richland, MT

Built 2008 Load: 27.5 t ADT: 339

NFSR #144

Good

Over: WEST FORK TETON RIVER

1/2 MI SO OF W.F. STATION, Teton, MT

Built 1977 Load: 27.5 t ADT: 65

NO DATA ENTERED

Good

Over: COOPER CREEK

NO DATA ENTERED, Sanders, MT

Built 2000 Load: 27.9 t ADT: 40

MONAD RD

Good

Over: BBWA CANAL 151

BILLINGS-MONAD RD, Yellowstone, MT

Built 1986 Load: 27.9 t ADT: 7,079

IRR - I 90

Good

Over: LITTLE BIGHORN RIVER

8M S CROW AGENCY, Big Horn, MT

Built 1980 Load: 28.1 t ADT: 2,055

LITTLE HORN RD

Good

Over: LITTLE BIGHORN RIVER 073

11M SW WYOLA, Big Horn, MT

Built 1996 Load: 28.1 t ADT: 243

IRR - S 314

Good

Over: DAVIS CREEK

3M SW BUSBY, Big Horn, MT

Built 1983 Load: 28.1 t ADT: 386

IRR - S 451

Good

Over: LITTLE BIGHORN RIVER

3M S GARRYOWEN INT, Big Horn, MT

Built 1980 Load: 28.1 t ADT: 944

N FORK RD

Good

Over: DEEP CREEK 008

10M E TOWNSEND, Broadwater, MT

Built 2015 Load: 28.1 t ADT: 100

LOMA BRIDGE RD

Good

Over: MISSOURI RIVER 002

1M SE LOMA, Chouteau, MT

Built 1991 Load: 28.1 t ADT: 100

WHITNEY CR RD

Good

Over: O`FALLON CREEK

ISMAY-WHITNEY CR RD, Custer, MT

Built 1990 Load: 28.1 t ADT: 38

IRR - S 13

Good

Over: NEGRO COULEE

5M S SCOBEY, Daniels, MT

Built 1988 Load: 28.1 t ADT: 312

US 191

Good

Over: BOX ELDER CR

8M NE ROY, Fergus, MT

Built 2002 Load: 28.1 t ADT: 624

S 81

Good

Over: WARM SPRING CREEK

12M SW HILGER, Fergus, MT

Built 2008 Load: 28.1 t ADT: 375

MERIWETHER RD

Good

Over: CUT BANK CREEK

11M NE BLACKFOOT, Glacier, MT

Built 2002 Load: 28.1 t ADT: 156

US 12

Good

Over: CARELESS CREEK

3M NE RYEGATE, Golden Valley, MT

Built 1988 Load: 28.1 t ADT: 1,905

Showing 3,751-3,800 of 5,122 bridges

Related

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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.