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

EDWARDS ROAD

Good

Over: E FORK BITTERROOT RIVER

SULA, Ravalli, MT

Built 2021 Load: 42.6 t ADT: 100

US 93

Good

Over: WILDLIFE UNDERPASS

3M N STEVENSVILLE, Ravalli, MT

Built 2005 Load: 42.6 t ADT: 11,080

S 327

Good

Over: LITTLE MUDDY CREEK

3M SE BAINVILLE, Roosevelt, MT

Built 2020 Load: 42.6 t ADT: 280

US 12

Good

Over: HOME CREEK

5M NE MELSTONE, Rosebud, MT

Built 2019 Load: 42.6 t ADT: 240

ROAD 227

Good

Over: KADING CREEK

NEAR KADING CREEK CG, Powell, MT

Built 2011 Load: 42.8 t ADT: 40

NO DATA ENTERED

Good

Over: LICK CREEK

NO DATA ENTERED, Ravalli, MT

Built 2003 Load: 42.8 t ADT: 40

DERBY GULCH ROAD

Good

Over: WEST BRIDGER CREEK

NO DATA ENTERED, Sweet Grass, MT

Built 2007 Load: 42.8 t ADT: 40

NO DATA ENTERED

Good

Over: SAVENAC CREEK

NO DATA ENTERED, Mineral, MT

Built 2009 Load: 43.1 t ADT: 50

HORSE RANCH ROAD

Good

Over: ARMELLS CREEK

3.9 miles north of Irish, Cascade, MT

Built 2017 Load: 43.5 t ADT: 20

US 87

Good

Over: BEAVER CREEK

7M SW LEWISTOWN, Fergus, MT

Built 2009 Load: 43.5 t ADT: 2,443

IRR - US 2

Good

Over: RR

2M SE BROWNING, Glacier, MT

Built 1997 Load: 43.5 t ADT: 3,608

US 287

Good

Over: MADISON RIVER OVERFLOW

SE ENNIS, Madison, MT

Built 2001 Load: 43.5 t ADT: 4,210

US 89

Good

Over: JENSEN COULEE

3M SE DUPUYER, Pondera, MT

Built 2006 Load: 43.5 t ADT: 485

EASTSIDE HWY

Good

Over: IRRIGATION CANAL

CORVALLIS-EASTSIDE HWY, Ravalli, MT

Built 1997 Load: 43.5 t ADT: 4,267

BUTTERFLY LAKE LN

Good

Over: BBWA CANAL 196

BILLINGS-BUTTERFLY LAKE L, Yellowstone, MT

Built 2004 Load: 43.5 t ADT: 100

NO DATA ENTERED

Good

Over: HELLS CANYON CREEK

UPPER END OF HELLS CANYON, Jefferson, MT

Built 1998 Load: 44.4 t ADT: 50

IRR BIA RTE 6

Good

Over: LITTLE BIGHORN RIVER

AT CROW AGENCY, Big Horn, MT

Built 1999 Load: 44.5 t ADT: 1,000

BRIDGE STREET

Good

Over: BELT CREEK 012

BELT-BRIDGE STREET, Cascade, MT

Built 2012 Load: 44.5 t ADT: 1,640

S 19

Good

Over: NORTH FORK BEAR CREEK

11M SE ROY, Fergus, MT

Built 1960 Load: 44.5 t ADT: 473

I 90

Good

Over: CAMP CREEK

1.9M E MANHATTAN, Gallatin, MT

Built 1965 Load: 44.5 t ADT: 9,601

E CUSTER AVE

Good

Over: HELENA VALLEY CANAL

HELENA-E CUSTER AVE, Lewis and Clark, MT

Built 2012 Load: 44.5 t ADT: 13,133

BLACK JACK RD

Good

Over: SAGE CREEK 001

14M E WHITLASH, Liberty, MT

Built 2006 Load: 44.5 t ADT: 100

US 2

Good

Over: SWAMP CREEK

23M NW HAPPY`S INN, Lincoln, MT

Built 2013 Load: 44.5 t ADT: 1,597

FRANCES HEIGHTS RD

Good

Over: CANAL 034

3M W VALIER, Pondera, MT

Built 2020 Load: 44.5 t ADT: 100

CLAGETT ST

Good

Over: COTTONWOOD CREEK 081

DEER LODGE-CLAGETT ST, Powell, MT

Built 2007 Load: 44.5 t ADT: 100

FOURTH ST

Good

Over: COTTONWOOD CREEK 080

DEER LODGE-4TH ST, Powell, MT

Built 2007 Load: 44.5 t ADT: 100

W GROVE ST

Good

Over: ROSEBUD CREEK

ABSAROKEE-W GROVE ST, Stillwater, MT

Built 1989 Load: 44.5 t ADT: 504

MULLOWNEY LN

Good

Over: RR

BILLINGS-MULLOWNEY LN, Yellowstone, MT

Built 2007 Load: 44.5 t ADT: 20,106

IRR BIA RTE 55

Good

Over: BOX ELDER CREEK

3.6 KM NW OF ROCKY BOYS, Hill, MT

Built 2003 Load: 44.6 t ADT: 10

NO DATA ENTERED

Good

Over: SF LITTLE JOE CREEK

NO DATA ENTERED, Mineral, MT

Built 2020 Load: 45.0 t ADT: 50

MT-43 FH 20

Good

Over: TRAIL CREEK

17 M W WISDOM, Beaverhead, MT

Built 2021 Load: 45.4 t ADT: 431

MT-43 FH 20

Good

Over: TRAIL CREEK

16 M W WISDOM, Beaverhead, MT

Built 2021 Load: 45.4 t ADT: 431

OVERLOOK DR

Good

Over: RR BY WATERWORKS

GREAT FALLS-OVERLOOK DR, Cascade, MT

Built 2009 Load: 45.4 t ADT: 5,117

ACKLEY LAKE RD

Good

Over: JUDITH RIVER 009

1M E UTICA, Judith Basin, MT

Built 2008 Load: 45.4 t ADT: 100

US 93

Good

Over: SPRING CREEK

3M S RAVALLI, Lake, MT

Built 2006 Load: 45.4 t ADT: 8,330

I 15

Good

Over: RR

2M N CRAIG, Lewis and Clark, MT

Built 1967 Load: 45.4 t ADT: 2,224

AUTO TOUR ROAD

Good

Over: DIKE TO BEAVER CREEK

SECT 1 BOWDOIN LAKE, Phillips, MT

Built 1987 Load: 45.4 t ADT: 20

US 93

Good

Over: SOUTH BASS CREEK

4M N STEVENSVILLE, Ravalli, MT

Built 2005 Load: 45.4 t ADT: 11,080

SHIELDS RIVER ROAD

Good

Over: SHIELDS RIVER

NO DATA ENTERED, Meagher, MT

Built 2016 Load: 45.7 t ADT: 50

ROCK CREEK LAKE RD

Good

Over: ROCK CREEK 079

8M NW DEER LODGE, Powell, MT

Built 2009 Load: 45.7 t ADT: 100

US 87

Good

Over: OTTER CREEK

5M SE BELT, Cascade, MT

Built 1959 Load: 46.3 t ADT: 1,078

BROADWAY AVE

Good

Over: HIGHWOOD CREEK

HIGHWOOD, Chouteau, MT

Built 1999 Load: 46.3 t ADT: 370

I 90

Good

Over: BAKER CREEK

1.9M E MANHATTAN, Gallatin, MT

Built 1965 Load: 46.3 t ADT: 9,601

I 90

Good

Over: BAKER CREEK

1.9M E MANHATTAN, Gallatin, MT

Built 1965 Load: 46.3 t ADT: 9,601

I 15

Good

Over: BOULDER RIVER

4.3M S BASIN, Jefferson, MT

Built 1985 Load: 46.3 t ADT: 1,571

PIONEER RD

Good

Over: JUDITH RIVER 011

4M NE HOBSON, Judith Basin, MT

Built 2006 Load: 46.3 t ADT: 18

MCDONALD LAKE RD

Good

Over: PABLO FEEDER CANAL 077

7M NE ST IGNATIUS, Lake, MT

Built 2004 Load: 46.3 t ADT: 100

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

1M S RAVALLI, Lake, MT

Built 2006 Load: 46.3 t ADT: 8,330

S 508 FH 62

Good

Over: HELLROARING CREEK

10M SW YAAK, Lincoln, MT

Built 1994 Load: 46.3 t ADT: 255

IRR - US 191

Good

Over: WEST ALKALI CREEK

13M SW MALTA, Phillips, MT

Built 2008 Load: 46.3 t ADT: 375

Showing 4,601-4,650 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.