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

I 90

Good

Over: CAMP CREEK

1.9M E MANHATTAN, Gallatin, MT

Built 1965 Load: 36.3 t ADT: 9,601

S 200-JORDAN AVE

Good

Over: BIG DRY CREEK

SOUTH EDGE JORDAN, Garfield, MT

Built 1993 Load: 36.3 t ADT: 1,084

IRRCOUNTY ROAD 227

Good

Over: ST MARY CANAL 058

NE BABB, Glacier, MT

Built 1986 Load: 36.3 t ADT: 100

ROCK CREEK ROAD

Good

Over: COUGAR CREEK

T08N R17W S07, Granite, MT

Built 2008 Load: 36.3 t ADT: 40

LIL BITTERROOT RD

Good

Over: LITTLE BITTERROOT R 063

7M E HOT SPRINGS, Lake, MT

Built 2013 Load: 36.3 t ADT: 100

IRR - US 93

Good

Over: JOCKO RIVER

ARLEE, Lake, MT

Built 2005 Load: 36.3 t ADT: 8,330

ELK CREEK RD

Good

Over: ELK CREEK 044

12M SE AUGUSTA, Lewis and Clark, MT

Built 2020 Load: 36.3 t ADT: 100

ELK CREEK RD

Good

Over: ELK CREEK 045

13M SW AUGUSTA, Lewis and Clark, MT

Built 2020 Load: 36.3 t ADT: 100

ELK CREEK RD

Good

Over: ELK CREEK 046

13M SW AUGUSTA, Lewis and Clark, MT

Built 2021 Load: 36.3 t ADT: 100

YORK RD

Good

Over: TROUT CREEK

15M NE HELENA, Lewis and Clark, MT

Built 1982 Load: 36.3 t ADT: 470

591 ZERO/SPREAD RD

Good

Over: HELLROARING CREEK

JUST PAST JCT WITH 745, Lincoln, MT

Built 2001 Load: 36.3 t ADT: 40

US 93

Good

Over: WILDLIFE CROSSING

9M N WYE INT, Missoula, MT

Built 2009 Load: 36.3 t ADT: 8,184

US 93

Good

Over: WILDLIFE UPASS-SCHLEY CR

12M N WYE INT, Missoula, MT

Built 2009 Load: 36.3 t ADT: 8,184

S ORANGE ST

Good

Over: PEDESTRIAN-BIKE PATH

MISSOULA-S ORANGE ST, Missoula, MT

Built 2002 Load: 36.3 t ADT: 22,614

MURPHY LN

Good

Over: IRRIGATION CANAL 003

E EMIGRANT, Park, MT

Built 2003 Load: 36.3 t ADT: 1,444

WILLOW ROAD

Good

Over: RACETRACK CREEK

7M SW DEERLODGE, Powell, MT

Built 2015 Load: 36.3 t ADT: 74

SAWMILL RD

Good

Over: ROCK CREEK 047

GARRISON, Powell, MT

Built 2006 Load: 36.3 t ADT: 100

CABIN CREEK RD

Good

Over: CABIN CREEK 008

13M NE MILDRED, Prairie, MT

Built 2012 Load: 36.3 t ADT: 100

COUNTY ROAD 321

Good

Over: CHARLEY CREEK 015

53M NW SIDNEY, Richland, MT

Built 1998 Load: 36.3 t ADT: 100

S 261

Good

Over: SMITH CREEK

23M S SIDNEY, Richland, MT

Built 2008 Load: 36.3 t ADT: 74

S ARCHER RD

Good

Over: BIG MUDDY CREEK 016

7M SE REDSTONE, Sheridan, MT

Built 2004 Load: 36.3 t ADT: 17

I 90

Good

Over: YELLOWSTONE RIVER

BILLINGS, Yellowstone, MT

Built 2022 Load: 36.3 t ADT: 14,315

CATARACT CREEK RD

Good

Over: CATARACT CREEK 071

4M W BASIN, Jefferson, MT

Built 2005 Load: 36.4 t ADT: 100

CATARACT CREEK RD

Good

Over: CATARACT CREEK 072

7M W BASIN, Jefferson, MT

Built 2005 Load: 36.4 t ADT: 100

NO DATA ENTERED

Good

Over: VAN NESS CREEK

NO DATA ENTERED, Mineral, MT

Built 2019 Load: 36.6 t ADT: 50

PETTY CREEK ROAD

Good

Over: PETTY CREEK 117

9M S ALBERTON, Missoula, MT

Built 2013 Load: 36.6 t ADT: 388

DRY CREEK RD

Good

Over: DRY CREEK 119

9M N BELGRADE, Gallatin, MT

Built 2009 Load: 36.7 t ADT: 260

STONE BARN LN

Good

Over: ROCK CREEK 142

10M S MOORE, Fergus, MT

Built 2012 Load: 36.9 t ADT: 100

HYALITE ROAD

Good

Over: EAST FORK HYALITE CREEK

HYALITE DRAINAGE, Gallatin, MT

Built 2014 Load: 36.9 t ADT: 40

NO DATA ENTERED

Good

Over: RICH CREEK

NO DATA ENTERED, Lincoln, MT

Built 2006 Load: 36.9 t ADT: 25

SURVEYOR CREEK

Good

Over: SURVEYOR CREEK

SURVEYOR CREEK, Mineral, MT

Built 2015 Load: 36.9 t ADT: 40

FOREST ROAD

Good

Over: BEAVER CREEK

SALISH TRAPPER ROAD, Missoula, MT

Built 1970 Load: 36.9 t ADT: 5

NO DATA ENTERED

Good

Over: DUNHAM CREEK

NO DATA ENTERED, Powell, MT

Built 2020 Load: 36.9 t ADT: 50

NO DATA ENTERED

Good

Over: HUGHES CR

NO DATA ENTERED, Ravalli, MT

Built 2016 Load: 36.9 t ADT: 5

IRR BIA RTE 73

Good

Over: BIG HORN CANAL

4.5 KM SE OF ST. XAVIER, Big Horn, MT

Built 1986 Load: 37.2 t ADT: 200

I 90

Good

Over: FLY CREEK

16.8M W HARDIN, Big Horn, MT

Built 1972 Load: 37.2 t ADT: 3,688

US 89 FH 32

Good

Over: DRY FORK BELT CREEK

MONARCH, Cascade, MT

Built 2014 Load: 37.2 t ADT: 448

HIGHWOOD RD

Good

Over: BELT CREEK

6M S HIGHWOOD, Cascade, MT

Built 2009 Load: 37.2 t ADT: 456

SHEPHERD X-ING RD

Good

Over: HIGHWOOD CREEK 001

4M NW HIGHWOOD, Chouteau, MT

Built 2017 Load: 37.2 t ADT: 100

WILLOW GLEN RD

Good

Over: MILL CREEK 004

1M W OPPORTUNITY, Deer Lodge, MT

Built 2015 Load: 37.2 t ADT: 252

LAKE ST

Good

Over: BAKER LAKE OVERFLOW

BAKER-LAKE ST, Fallon, MT

Built 2009 Load: 37.2 t ADT: 2,379

P 81

Good

Over: JUDITH RIVER

11M SE DENTON, Fergus, MT

Built 2020 Load: 37.2 t ADT: 263

P-81

Good

Over: WARM SPRING CREEK

13M SW HILGER, Fergus, MT

Built 2020 Load: 37.2 t ADT: 375

S 19

Good

Over: MCDONALD CREEK

2M N GRASS RANGE, Fergus, MT

Built 1962 Load: 37.2 t ADT: 586

S 200

Good

Over: VAIL CREEK-STOCKPASS

2M E JORDAN, Garfield, MT

Built 2004 Load: 37.2 t ADT: 514

HENDERSON CREEK RO

Good

Over: FLINT CREEK 035

11M S DRUMMOND, Granite, MT

Built 2013 Load: 37.2 t ADT: 100

DUNN LN

Good

Over: BOULDER RIVER 028

20M SE BOULDER, Jefferson, MT

Built 2015 Load: 37.2 t ADT: 100

DOUBLE G RD

Good

Over: SAGE CREEK 005

12M E STANFORD, Judith Basin, MT

Built 2002 Load: 37.2 t ADT: 100

S VALLEY CREEK RD

Good

Over: JOCKO RIVER 056

4M NW ARLEE, Lake, MT

Built 2012 Load: 37.2 t ADT: 122

DEARBORN CANYON RD

Good

Over: DEARBORN RIVER 048

1M SW BEAN LAKE, Lewis and Clark, MT

Built 1982 Load: 37.2 t ADT: 117

Showing 4,401-4,450 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.