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

IRRS 234

Good

Over: BEAVER CREEK

13M S HAVRE, Hill, MT

Built 2003 Load: 34.2 t ADT: 563

IRRS 234

Good

Over: BEAVER CREEK

16M S HAVRE, Hill, MT

Built 2003 Load: 34.2 t ADT: 563

IRR BIA RTE 1

Good

Over: WHITETAIL CREEK

AT HEART BUTTE, Pondera, MT

Built 1977 Load: 34.2 t ADT: 700

RD 309

Good

Over: E F PIPE CR

BIG BALDY MTN, Lincoln, MT

Built 1977 Load: 34.3 t ADT: 50

KELLY RD

Good

Over: FLATWILLOW CREEK 013

8M S WINNETT, Petroleum, MT

Built 2013 Load: 34.3 t ADT: 58

NO DATA ENTERED

Good

Over: RYE CR

NO DATA ENTERED, Ravalli, MT

Built 2020 Load: 34.3 t ADT: 10

JACK REEK RD

Good

Over: JACK CREEK 065

4M E ENNIS, Madison, MT

Built 2004 Load: 34.4 t ADT: 100

MANSFIELD LN

Good

Over: HORSE PRAIRIE CREEK 011

2M NW GRANT, Beaverhead, MT

Built 2007 Load: 34.5 t ADT: 100

US 2

Good

Over: MAIN IRRIGATION CANAL

HARLEM, Blaine, MT

Built 1968 Load: 34.5 t ADT: 3,196

STAGECOACH TRAIL

Good

Over: SHONKIN CREEK 006

3M SE FORT BENTON, Chouteau, MT

Built 2002 Load: 34.5 t ADT: 100

S 80

Good

Over: SHONKIN CREEK

1M E FORT BENTON, Chouteau, MT

Built 2003 Load: 34.5 t ADT: 692

NAVAJO RD

Good

Over: EAGLE CREEK 004

10M SE FLAXVILLE, Daniels, MT

Built 1986 Load: 34.5 t ADT: 100

IRR - S 13

Good

Over: POPLAR RIVER

4M S SCOBEY, Daniels, MT

Built 1988 Load: 34.5 t ADT: 312

S 200

Good

Over: CORRAL CREEK

11 M NE CIRCLE, Dawson, MT

Built 2020 Load: 34.5 t ADT: 237

S 19

Good

Over: SOUTH FORK BEAR CREEK

12M N GRASS RANGE, Fergus, MT

Built 1960 Load: 34.5 t ADT: 473

STRAW RD

Good

Over: WEST BUFFALO CREEK 042

11M SE HOBSON, Judith Basin, MT

Built 2014 Load: 34.5 t ADT: 10

INDIAN BUTTE RD

Good

Over: LOUSE CREEK 037

2M N MOCCASIN, Judith Basin, MT

Built 2009 Load: 34.5 t ADT: 100

N RESEVOIR RD

Good

Over: PABLO FEEDER CANAL 085

5M S POLSON, Lake, MT

Built 2009 Load: 34.5 t ADT: 857

GREEN MEADOW DR

Good

Over: SILVER CREEK

6M N HELENA, Lewis and Clark, MT

Built 2000 Load: 34.5 t ADT: 2,548

BIBLE LANE

Good

Over: PETTY CREEK

2M SE ALBERTON, Missoula, MT

Built 2020 Load: 34.5 t ADT: 3,077

US 93

Good

Over: WILDLIFE UPASS-FINLEY CR

12M N WYE INT, Missoula, MT

Built 2009 Load: 34.5 t ADT: 8,184

I 15

Good

Over: RR

2M N CONRAD, Pondera, MT

Built 1972 Load: 34.5 t ADT: 1,705

I 15

Good

Over: RR

2M N CONRAD, Pondera, MT

Built 1972 Load: 34.5 t ADT: 1,705

I 15

Good

Over: DRY FORK MARIAS RIVER

2M N CONRAD, Pondera, MT

Built 1972 Load: 34.5 t ADT: 1,705

I 15

Good

Over: DRY FORK MARIAS RIVER

2M N CONRAD, Pondera, MT

Built 1972 Load: 34.5 t ADT: 1,705

US 89

Good

Over: VALIER CANAL

3M NW DUPUYER, Pondera, MT

Built 1965 Load: 34.5 t ADT: 416

US 93 FH 19

Good

Over: E FORK BITTERROOT RIVER

S SULA, Ravalli, MT

Built 2003 Load: 34.5 t ADT: 1,069

EASTSIDE HWY

Good

Over: IRRIGATION CANAL

4M N CORVALLIS, Ravalli, MT

Built 1997 Load: 34.5 t ADT: 3,586

S 200

Good

Over: BEAVER CREEK

3M SE TROUT CREEK, Sanders, MT

Built 1986 Load: 34.5 t ADT: 2,030

BRIDGER CREEK RD

Good

Over: BRIDGER CREEK

13.6M SE GREYCLIFF, Sweet Grass, MT

Built 2021 Load: 34.5 t ADT: 100

OTTER CREEK RD

Good

Over: SWEET GRASS CREEK 00

6M SE MELVILLE, Sweet Grass, MT

Built 2009 Load: 34.5 t ADT: 65

IRR - S 24

Good

Over: MID FK PORCUPINE CREEK

11M S OPHEIM, Valley, MT

Built 2018 Load: 34.5 t ADT: 199

CANE ST

Good

Over: FLY CREEK 136

POMPEY`S PILLAR, Yellowstone, MT

Built 1976 Load: 34.5 t ADT: 100

FDR #1079

Good

Over: BIG BEAVER CR.

NO DATA ENTERED, Beaverhead, MT

Built 2006 Load: 34.7 t ADT: 12

S FK PLACID CR RD

Good

Over: PLACID CR

SO FK PLACID, Missoula, MT

Built 1976 Load: 34.7 t ADT: 40

HYALITE RD

Good

Over: EAST FORK HYALITE CREEK

HYALITE DRAINAGE, Gallatin, MT

Built 2013 Load: 35.0 t ADT: 40

DRY CREEK RD

Good

Over: DRY CREEK

13M N BELGRADE, Gallatin, MT

Built 2012 Load: 35.2 t ADT: 200

FDR2488

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Deer Lodge, MT

Built 1994 Load: 35.3 t ADT: 20

FOREST ROAD

Good

Over: SOUTH FORK CANYON CREEK

TRUMBULL CREEK AREA, Flathead, MT

Built 2005 Load: 35.3 t ADT: 40

NO DATA ENTERED

Good

Over: MEADOW CR

BEGINNING OF MCDOUGAL RD, Granite, MT

Built 1978 Load: 35.3 t ADT: 40

BLACK LN

Good

Over: SURPRISE DITCH 056

2M N HAMILTON, Ravalli, MT

Built 2013 Load: 35.3 t ADT: 1,184

STEEL CREEK RD

Good

Over: STEEL CREEK 082

1M NE WISDOM, Beaverhead, MT

Built 2012 Load: 35.4 t ADT: 100

IRR - S 313

Good

Over: WILLIAMS COULEE

1M S HARDIN, Big Horn, MT

Built 2021 Load: 35.4 t ADT: 1,049

LITTLE HORN RD

Good

Over: PASS CREEK 071

1M SW WYOLA, Big Horn, MT

Built 2004 Load: 35.4 t ADT: 243

US 2

Good

Over: RED ROCK WEST OVERFLOW

2M W CHINOOK, Blaine, MT

Built 2020 Load: 35.4 t ADT: 2,637

VALLEY RD

Good

Over: MILK RIVER 125

12M E HARLEM, Blaine, MT

Built 2010 Load: 35.4 t ADT: 100

MERILL RD

Good

Over: MILK RIVER 081

4M W HARLEM, Blaine, MT

Built 2010 Load: 35.4 t ADT: 100

SECONDARY 78

Good

Over: EAST ROSEBUD CREEK

6 MILES SOUTH OF ABSAROKE, Carbon, MT

Built 2019 Load: 35.4 t ADT: 657

US 212

Good

Over: ROCK CREEK

2M N ROBERTS, Carbon, MT

Built 2001 Load: 35.4 t ADT: 2,476

S 72

Good

Over: BEAR CREEK

BELFRY, Carbon, MT

Built 2013 Load: 35.4 t ADT: 1,722

Showing 4,301-4,350 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.