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

US 87

Good

Over: OTTER CREEK

RAYNESFORD, Judith Basin, MT

Built 1961 Load: 56.2 t ADT: 2,774

US 93

Good

Over: WILDLIFE UNDERPASS

11M N WYE INT, Missoula, MT

Built 2009 Load: 56.2 t ADT: 8,184

I 90

Good

Over: RATTLER GULCH

4.1M W DRUMMOND, Granite, MT

Built 1971 Load: 57.2 t ADT: 11,980

US 87

Good

Over: OTTER CREEK

2M W RAYNESFORD, Judith Basin, MT

Built 1961 Load: 58.1 t ADT: 2,774

US 87

Good

Over: OTTER CREEK

1M W RAYNESFORD, Judith Basin, MT

Built 1961 Load: 58.1 t ADT: 2,774

IRR BIA RTE 166

Good

Over: REVIAS CREEK

3.0 KM SOUTH OF HWY 200, Sanders, MT

Built 2014 Load: 58.1 t ADT: 30

BARNEY OLSEN RD

Good

Over: PEOPLE`S CREEK 105

6M NE CLEVELAND, Blaine, MT

Built 2015 Load: 59.0 t ADT: 42

EWING RD

Good

Over: LITTLE BELT CREEK 098

4M N BELT, Cascade, MT

Built 1973 Load: 59.0 t ADT: 100

FOREST ROAD

Good

Over: SOLDIER CREEK

SOLDIER CR, Flathead, MT

Built 1992 Load: 59.0 t ADT: 80

US 87

Good

Over: OTTER CREEK

1M SE RAYNESFORD, Judith Basin, MT

Built 1964 Load: 59.0 t ADT: 2,242

6127 CONN-MULE RD.

Good

Over: 17 MILE CR

.1 FROM JCT 471, Lincoln, MT

Built 1993 Load: 60.3 t ADT: 10

JACK CREEK RD

Good

Over: JACK CREEK 029

8M E ENNIS, Madison, MT

Built 2011 Load: 60.3 t ADT: 175

JACK CREEK RD

Good

Over: JACK CREEK 030

7M E ENNIS, Madison, MT

Built 2011 Load: 60.9 t ADT: 175

US 2

Good

Over: MILLER CREEK

14M W HAPPY`S INN, Lincoln, MT

Built 1988 Load: 61.0 t ADT: 1,480

FOREST ROAD

Good

Over: ELK CREEK

ELK CREEK ROAD, Missoula, MT

Built 1981 Load: 61.2 t ADT: 10

PLEVNA RD N

Good

Over: PENNEL CREEK

6 M N PLEVNA, Fallon, MT

Built 2020 Load: 61.7 t ADT: 107

US 93

Good

Over: WILDLIFE UNDERPASS

3M N STEVENSVILLE, Ravalli, MT

Built 2006 Load: 61.7 t ADT: 11,080

US 93

Good

Over: NORTH BASS CREEK

4M N STEVENSVILLE, Ravalli, MT

Built 2005 Load: 61.7 t ADT: 11,080

KNAPP RD

Good

Over: LITTLE BITTERROOT RV 079

9M SE HOT SPRINGS, Sanders, MT

Built 2002 Load: 62.4 t ADT: 100

S 508 FH 62

Good

Over: PETE CREEK

2M W YAAK, Lincoln, MT

Built 1989 Load: 62.6 t ADT: 269

10TH LN NW

Good

Over: MUDDY CREEK 025

12M N CHOTEAU, Teton, MT

Built 2009 Load: 63.5 t ADT: 100

CONLEY AVE

Good

Over: CLARK FORK RIVER

DEER LODGE, Powell, MT

Built 2021 Load: 64.4 t ADT: 100

NO DATA ENTERED

Good

Over: STORM LAKE CREEK

NO DATA ENTERED, Deer Lodge, MT

Built 2011 Load: 65.4 t ADT: 10

TAYLOR FK. ROAD

Good

Over: TAYLOR FK. CREEK

TAYLOR FORK ROAD, Gallatin, MT

Built 1997 Load: 66.1 t ADT: 40

IRR BIA RTE 1012

Good

Over: NORTH FORK JOCKO RIVER

24.1KM NORTHEAST OF ARLEE, Lake, MT

Built 2003 Load: 66.6 t ADT: 30

MANY GLACIER ROAD

Good

Over: SWIFT CURRENT CREEK

11.3 miles west of U.S. R, Glacier, MT

Built 2014 Load: 67.1 t ADT: 300

JAP EVANS RD

Good

Over: WILLOW CREEK

9M NE DEVON, Toole, MT

Built 2020 Load: 68.0 t ADT: 100

ROAD 1077

Good

Over: COTTONWOOD CREEK 018

30M N WOLF POINT, Roosevelt, MT

Built 1995 Load: 70.8 t ADT: 100

MOOSE LAKE RD

Good

Over: E FORK ROCK CREEK 030

10M SW PORTERS CORNER, Granite, MT

Built 1950 Load: 74.4 t ADT: 183

IRR BIA RTE 166

Good

Over: REVIAS CREEK

7.5KM SOUTH OF HWY 200, Sanders, MT

Built 2002 Load: 75.5 t ADT: 30

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

1M N ST IGNATIUS, Lake, MT

Built 2006 Load: 76.2 t ADT: 7,419

US 2

Good

Over: DODSON CREEK OVERFLOW

2M E DODSON, Phillips, MT

Built 2008 Load: 77.1 t ADT: 1,189

W KOOTENAI RD

Good

Over: DODGE CREEK 138

7M NW REXFORD, Lincoln, MT

Built 1974 Load: 78.0 t ADT: 100

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

2M N ST IGNATIUS, Lake, MT

Built 2006 Load: 78.9 t ADT: 7,419

BLUE CREEK RD

Good

Over: BLUE CREEK

7M S BILLINGS, Yellowstone, MT

Built 1982 Load: 78.9 t ADT: 796

S 24

Good

Over: GALPIN COULEE

4M NW FORT PECK, Valley, MT

Built 1993 Load: 80.7 t ADT: 762

BIA RTE 1

Good

Over: BLACKTAIL CREEK

4.0KM SE OF HEART BUTTE, Pondera, MT

Built 2021 Load: 81.6 t ADT: 700

IRR BIA RTE 130

Good

Over: WEST MAGPIE CREEK

1.6KM N TO US HWY 10, Sanders, MT

Built 2003 Load: 81.9 t ADT: 30

IRR - US 191

Good

Over: BLACK COULEE

13M SW MALTA, Phillips, MT

Built 2008 Load: 84.4 t ADT: 375

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

1M N RAVALLI, Lake, MT

Built 2006 Load: 85.3 t ADT: 6,822

FOOTHILL RD

Good

Over: MISSION CREEK 044

2M E ST IGNATIUS, Lake, MT

Built 1988 Load: 87.1 t ADT: 100

REAGAN RD

Good

Over: ROCKY COULEE 039

20M N CUTBANK, Glacier, MT

Built 2004 Load: 88.0 t ADT: 100

US 2

Good

Over: EXETER CREEK

4M W MALTA, Phillips, MT

Built 1990 Load: 88.0 t ADT: 1,388

S 59

Good

Over: NORTH WOMAN CREEK

9M SE MILES CITY, Custer, MT

Built 1986 Load: 89.8 t ADT: 952

SPOKANE AVE

Good

Over: WHITEFISH RIVER

WHITEFISH-SPOKANE AVE, Flathead, MT

Built 1959 Load: 89.8 t ADT: 15,755

LONE MOUNTAIN TRL

Good

Over: N FK W GALLATIN RIV 005

4M W BIG SKY, Gallatin, MT

Built 1982 Load: 89.8 t ADT: 2,798

I 15

Good

Over: LITTLE PRICKLY PEAR CR

2M NW SEIBEN INT, Lewis and Clark, MT

Built 1965 Load: 89.8 t ADT: 4,765

S 13

Good

Over: DRAINAGE

4M N VIDA, McCone, MT

Built 1994 Load: 89.8 t ADT: 896

IRR - S 13

Good

Over: DRAINAGE-STOCKPASS

11M N VIDA, McCone, MT

Built 1995 Load: 89.8 t ADT: 979

S 200

Good

Over: COTTONWOOD CREEK

7M W OVANDO, Powell, MT

Built 1954 Load: 89.8 t ADT: 2,627

Showing 4,701-4,750 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.