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

RD 3822

Good

Over: BIG CREEK

W FK BIG CR, Mineral, MT

Built 2019 Load: 33.0 t ADT: 50

ASH CR RD E

Good

Over: BEAVER CREEK 031

21M NE BAKER, Fallon, MT

Built 2003 Load: 33.2 t ADT: 100

NO DATA ENTERED

Good

Over: WEST FORK ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 2010 Load: 33.4 t ADT: 40

FOREST GROVE RD

Good

Over: S FORK MCDONALD CR 072

GRASSRANGE, Fergus, MT

Built 2011 Load: 33.4 t ADT: 146

FOREST ROAD

Good

Over: ALDER CREEK

GOOD CREEK ROAD, Flathead, MT

Built 1983 Load: 33.4 t ADT: 50

NFSR 233

Good

Over: BEAVER CREEK

25.4 MI NW OF AUGUSTA, Lewis and Clark, MT

Built 1978 Load: 33.4 t ADT: 26

CENTER ST

Good

Over: COTTONWOOD CREEK 049

DEER LODGE-CENTER ST, Powell, MT

Built 2015 Load: 33.4 t ADT: 100

NO DATA ENTERED

Good

Over: BOULDER CREEK

NO DATA ENTERED, Ravalli, MT

Built 1979 Load: 33.4 t ADT: 20

LIL BITTERROOT RD

Good

Over: WARM SPRING CREEK 093

4M E HOT SPRINGS, Sanders, MT

Built 2009 Load: 33.4 t ADT: 100

PLACID LAKE RD

Good

Over: OWL CREEK 076

3M S SEELEY LAKE, Missoula, MT

Built 1970 Load: 33.5 t ADT: 100

MERIDIAN RD

Good

Over: PONDERA COULEE 015

12M NE BRADY, Pondera, MT

Built 1960 Load: 33.5 t ADT: 100

BRENNER LANE

Good

Over: TRAIL CREEK

12 M W GRANT, Beaverhead, MT

Built 2020 Load: 33.6 t ADT: 100

FRYING PAN ROAD

Good

Over: WEST SIDE CANAL 126

3M N DILLON, Beaverhead, MT

Built 2011 Load: 33.6 t ADT: 350

IRR - US 212

Good

Over: ROSEBUD CREEK

BUSBY, Big Horn, MT

Built 1992 Load: 33.6 t ADT: 2,542

COTTONWOOD RD

Good

Over: CLARKS FK YELLOWSTNE 028

1M E SILESIA, Carbon, MT

Built 1997 Load: 33.6 t ADT: 414

US 212 FH 59

Good

Over: ROCK CREEK

8M SW RED LODGE, Carbon, MT

Built 1965 Load: 33.6 t ADT: 372

CROW CREEK RD

Good

Over: CROW CREEK 033

17M NW HAMMOND, Carter, MT

Built 2015 Load: 33.6 t ADT: 100

ULM VAUGHN RD

Good

Over: SUN RIVER 057

2M S VAUGHN, Cascade, MT

Built 2013 Load: 33.6 t ADT: 695

S 200

Good

Over: DUGOUT COULEE

27M SW JORDAN, Garfield, MT

Built 1973 Load: 33.6 t ADT: 534

IRR - US 87

Good

Over: BOX ELDER CREEK

BOX ELDER, Hill, MT

Built 1969 Load: 33.6 t ADT: 1,559

US 87

Good

Over: BEAVER CREEK

2M SW HAVRE, Hill, MT

Built 1966 Load: 33.6 t ADT: 2,878

US 12

Good

Over: PRICKLY PEAR CREEK

EAST HELENA, Lewis and Clark, MT

Built 1978 Load: 33.6 t ADT: 13,647

CANYON FERRY RD

Good

Over: HELENA VALLEY CANAL

5M E HELENA, Lewis and Clark, MT

Built 2009 Load: 33.6 t ADT: 4,806

OLD US HWY 2 N

Good

Over: CURLEY CREEK 005

18M N TROY, Lincoln, MT

Built 1927 Load: 33.6 t ADT: 100

S 508 FH 62

Good

Over: SPREAD CREEK

7M W YAAK, Lincoln, MT

Built 1989 Load: 33.6 t ADT: 269

US 287

Good

Over: MADISON RIVER OVERFLOW

ENNIS, Madison, MT

Built 2001 Load: 33.6 t ADT: 4,210

BLUE SKY RD

Good

Over: NO NAME DITCH 076

4M SE VALIER, Pondera, MT

Built 2020 Load: 33.6 t ADT: 5

US 93 FH 19

Good

Over: E FORK BITTERROOT RIVER

S SULA, Ravalli, MT

Built 2003 Load: 33.6 t ADT: 1,037

US 93

Good

Over: LOST HORSE CREEK

7M N DARBY, Ravalli, MT

Built 1990 Load: 33.6 t ADT: 4,502

BELL CROSSING

Good

Over: BITTERROOT RIVER OVERFLO

3M NE VICTOR, Ravalli, MT

Built 1974 Load: 33.6 t ADT: 2,762

IRR - S 13

Good

Over: BOX ELDER CREEK

23M NE WOLF POINT, Roosevelt, MT

Built 2019 Load: 33.6 t ADT: 179

US 12

Good

Over: BIG PORCUPINE OVERFLOW

13M NW FORSYTH, Rosebud, MT

Built 1988 Load: 33.6 t ADT: 226

US 12

Good

Over: MCGRAWS COULEE

5M NW FORSYTH, Rosebud, MT

Built 2012 Load: 33.6 t ADT: 226

I-90 E&W

Good

Over: ABANDONED RAILROAD

2.5M S OPPORTUNITY, Silver Bow, MT

Built 2019 Load: 33.6 t ADT: 14,818

N STILLWATER RD

Good

Over: STILLWATER RIVER 021

2M NE ABSAROKEE, Stillwater, MT

Built 2001 Load: 33.6 t ADT: 100

BRIDGER CREEK ROAD

Good

Over: BRIDGER CREEK

9M SE GREYCLIFF, Sweet Grass, MT

Built 2022 Load: 33.6 t ADT: 100

HOWIE RD

Good

Over: OTTER CREEK

2M NE BIG TIMBER, Sweet Grass, MT

Built 2000 Load: 33.6 t ADT: 481

TETON CANYON RD

Good

Over: IRRIGATION CANAL 131

8M W CHOTEAU, Teton, MT

Built 2012 Load: 33.6 t ADT: 172

SELKIRK RD

Good

Over: MUSSELSHELL RIVER 018

6M W TWO DOT, Wheatland, MT

Built 2011 Load: 33.6 t ADT: 100

BLUE CREEK RD

Good

Over: BLUE CREEK

2M S BILLINGS, Yellowstone, MT

Built 1972 Load: 33.6 t ADT: 9,171

IRR BIA RTE 19

Good

Over: PEOPLES CREEK

CHIPPEWA STREET IN HAYS, Blaine, MT

Built 2000 Load: 33.7 t ADT: 250

MARSH RD

Good

Over: CEDAR CREEK

13M S GLENDIVE, Dawson, MT

Built 2003 Load: 33.7 t ADT: 93

IRR - US 89

Good

Over: SOUTH FORK MILK RIVER

48 39 05.40, Glacier, MT

Built 2022 Load: 33.7 t ADT: 1,607

MCHUGH LN

Good

Over: TEN MILE CREEK 087

2M N HELENA, Lewis and Clark, MT

Built 1989 Load: 33.7 t ADT: 1,882

NO DATA ENTERED

Good

Over: DODGE CREEK

NO DATA ENTERED, Lincoln, MT

Built 2002 Load: 33.7 t ADT: 25

NO DATA ENTERED

Good

Over: BASS CREEK

NO DATA ENTERED, Ravalli, MT

Built 2001 Load: 33.7 t ADT: 50

S 47

Good

Over: LOW LINE DITCH

5M N HARDIN, Big Horn, MT

Built 1989 Load: 34.0 t ADT: 636

FS RTE 209

Good

Over: MADISON RIVER

MADISON RIVER, Madison, MT

Built 1964 Load: 34.0 t ADT: 40

FOREST ROAD

Good

Over: KRAFT CREEK

KRAFT CREEK, Missoula, MT

Built 1985 Load: 34.0 t ADT: 1

COTTONWOOD LAKES

Good

Over: TRAIL CREEK

TRAIL CREEK CROSSING, Missoula, MT

Built 2011 Load: 34.0 t ADT: 40

Showing 4,251-4,300 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.