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

S 40

Good

Over: WHITEFISH RIVER

3M SE WHITEFISH, Flathead, MT

Built 1975 Load: 24.5 t ADT: 12,370

IRR BIA RTE 13

Good

Over: ST MARY CANAL

32 KM NE OF BABB, Glacier, MT

Built 2002 Load: 24.5 t ADT: 10

DUCK LAKE RD

Good

Over: SOUTH FORK MILK RIVER

16M NW BROWNING, Glacier, MT

Built 1987 Load: 24.5 t ADT: 897

CLEAR CREEK RD SE

Good

Over: BULL HOOK DIVERSION 017

SE HAVRE, Hill, MT

Built 1984 Load: 24.5 t ADT: 942

SWAMP COULEE RD

Good

Over: BEAVER CREEK 040

15M S HAVRE, Hill, MT

Built 1970 Load: 24.5 t ADT: 100

IRR BIA RTE 1114

Good

Over: JOCKO RIVER

14.5 KM EAST OF ARLEE, Lake, MT

Built 1996 Load: 24.5 t ADT: 75

EAST POST CREEK RD

Good

Over: POST CREEK 080

5 MI N OF ST IGNATIUS, Lake, MT

Built 2022 Load: 24.5 t ADT: 100

CANYON MILL RD

Good

Over: PABLO FEEDER CANAL 008

2M NW RONAN, Lake, MT

Built 2014 Load: 24.5 t ADT: 100

SALMON PRAIRIE RD

Good

Over: SWAN RIVER 091

22M S SWAN LAKE, Lake, MT

Built 1986 Load: 24.5 t ADT: 100

ELK CREEK RD

Good

Over: ELK CREEK 043

10M SW AUGUSTA, Lewis and Clark, MT

Built 2010 Load: 24.5 t ADT: 100

S BOULDER RD

Good

Over: LWR S BOULDER RIVER 054

5M S JEFFERSON ISLAND, Madison, MT

Built 2008 Load: 24.5 t ADT: 100

S 201

Good

Over: REDWATER RIVER

17M NE VIDA, McCone, MT

Built 1957 Load: 24.5 t ADT: 39

NUMBER 4 RD

Good

Over: MUSSLESHELL RIVER 011

1M E ROUNDUP, Musselshell, MT

Built 1995 Load: 24.5 t ADT: 100

MISSION CREEK ROAD

Good

Over: MISSION CREEK

9M SE LIVINSTON, Park, MT

Built 2019 Load: 24.5 t ADT: 24

MILL CREEK RD

Good

Over: MILL CREEK 045

7M E EMIGRANT, Park, MT

Built 1972 Load: 24.5 t ADT: 102

US 93

Good

Over: ROCK CREEK

4M N DARBY, Ravalli, MT

Built 1990 Load: 24.5 t ADT: 4,502

US 93

Good

Over: N FORK BEAR CREEK

1M S VICTOR, Ravalli, MT

Built 2011 Load: 24.5 t ADT: 13,545

STILLWATER RIV RD

Good

Over: W FORK STILLWATER RIVER

1M N NYE, Stillwater, MT

Built 2003 Load: 24.5 t ADT: 721

STILLWATER RIV RD

Good

Over: W FORK STILLWATER RIVER

1M N NYE, Stillwater, MT

Built 2003 Load: 24.5 t ADT: 721

13TH LN NE

Good

Over: MUDDY CREEK 010

2M SW POWER, Teton, MT

Built 2007 Load: 24.5 t ADT: 100

OILMONT HWY

Good

Over: TRAIL CREEK

21M E OILMONT, Toole, MT

Built 1974 Load: 24.5 t ADT: 105

IRR BIA ROUTE 1

Good

Over: MAIN CANAL

4.0 KM SE OF OSWEGO, Valley, MT

Built 1972 Load: 24.5 t ADT: 1,200

S 56TH ST W

Good

Over: CANYON CREEK 073

W BILLINGS-S 56TH ST W, Yellowstone, MT

Built 1967 Load: 24.5 t ADT: 2,785

72ND ST W

Good

Over: CANYON CREEK 050

5M SW BILLINGS, Yellowstone, MT

Built 1959 Load: 24.5 t ADT: 4,244

HENNABERRY RD

Good

Over: BEAVERHEAD RIVER 125

HENNEBERRY ROAD, Beaverhead, MT

Built 2000 Load: 24.6 t ADT: 100

BIG SHEEP CR RD

Good

Over: BIG SHEEP CREEK 013

10M SW DELL, Beaverhead, MT

Built 2016 Load: 24.6 t ADT: 175

BIG SHEEP CR RD

Good

Over: BIG SHEEP CREEK 014

8.5M SW DELL, Beaverhead, MT

Built 2016 Load: 24.6 t ADT: 175

NO DATA ENTERED

Good

Over: BUTLER CR

KENNEDY RIDGE, Missoula, MT

Built 1980 Load: 24.6 t ADT: 40

NO DATA ENTERED

Good

Over: WARM SPRINGS CREEK

NO DATA ENTERED, Ravalli, MT

Built 2011 Load: 24.6 t ADT: 50

FDR 7498

Good

Over: BIRCH CREEK

NO DATA ENTERED, Beaverhead, MT

Built 1995 Load: 24.9 t ADT: 15

NO DATA ENTERED

Good

Over: EAST ROSEBUD CREEK

NO DATA ENTERED, Carbon, MT

Built 2007 Load: 24.9 t ADT: 40

FOREST ROAD

Good

Over: HAY CREEK

HAY DRAINAGE, Flathead, MT

Built 1983 Load: 24.9 t ADT: 5

COPPER CREEK ROAD

Good

Over: COPPER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2005 Load: 24.9 t ADT: 10

4402 SOUTHSIDE RD.

Good

Over: RUBY CREEK

JUST PAST JCT WITH 4477, Lincoln, MT

Built 1956 Load: 24.9 t ADT: 99

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Sanders, MT

Built 2005 Load: 24.9 t ADT: 40

YAAK 92

Good

Over: NORTH FORK YAAK RIVER

JUST BEFORE JCT 5828/8025, Lincoln, MT

Built 1986 Load: 25.3 t ADT: 99

2380 NF O'BRIEN

Good

Over: O'BRIEN CREEK

0.94 MI FROM JCT W/752, Lincoln, MT

Built 2009 Load: 25.3 t ADT: 40

RD 36

Good

Over: WOLF CR

WOLF CR MP 19.5, Lincoln, MT

Built 2015 Load: 25.3 t ADT: 40

NO DATA ENTERED

Good

Over: DEER CR

FISH CR LOLO CR, Mineral, MT

Built 2004 Load: 25.3 t ADT: 50

NO DATA ENTERED

Good

Over: NO ELK CREEK

NO DATA ENTERED, Mineral, MT

Built 2004 Load: 25.3 t ADT: 40

NO DATA ENTERED

Good

Over: HAIR BALL

NO DATA ENTERED, Mineral, MT

Built 2004 Load: 25.3 t ADT: 40

NO DATA ENTERED

Good

Over: LOWER NO ELK CREEK

NO DATA ENTERED, Mineral, MT

Built 2004 Load: 25.3 t ADT: 40

ARGENTA RD

Good

Over: RATTLESNAKE CREEK 039

11M NW DILLON, Beaverhead, MT

Built 2012 Load: 25.4 t ADT: 93

W PARK ST

Good

Over: BEAVERHEAD RIVER 005

1M W DILLON, Beaverhead, MT

Built 1992 Load: 25.4 t ADT: 100

FRONTAGE ROAD 332

Good

Over: LODGE GRASS CREEK 070

S LODGE GRASS, Big Horn, MT

Built 2015 Load: 25.4 t ADT: 50

TAUCK RD

Good

Over: L O CREEK 024

22M NE HAMMOND, Carter, MT

Built 2014 Load: 25.4 t ADT: 100

COTTONWOOD CR RD

Good

Over: S COTTONWOOD CREEK 021

15M NW ALZADA, Carter, MT

Built 2014 Load: 25.4 t ADT: 100

LITTLE MISSOURI RD

Good

Over: COTTONWOOD CREEK 011

3M S CAPITOL, Carter, MT

Built 2015 Load: 25.4 t ADT: 42

BOSTON COULEE RD

Good

Over: SMITH RIVER 027

7M SW EDEN, Cascade, MT

Built 2004 Load: 25.4 t ADT: 39

DENT BRIDGE RD

Good

Over: TETON RIVER 053

12M NW CARTER, Chouteau, MT

Built 1986 Load: 25.4 t ADT: 100

Showing 3,601-3,650 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.