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

ROAD 106

Fair

Over: KRUG CREEK 074

10M E GLENDIVE, Dawson, MT

Built 1951 Load: 32.7 t ADT: 100

COUNTY ROAD 317

Fair

Over: USBR MAIN CANAL 073

4M NE INTAKE, Dawson, MT

Built 2001 Load: 32.7 t ADT: 4

COUNTY ROAD 500

Fair

Over: S FORK LISK CREEK 070

4M N RICHEY, Dawson, MT

Built 1984 Load: 32.7 t ADT: 63

PINE STREET

Fair

Over: DRY CREEK 076

WEST GLENDIVE-PINE ST, Dawson, MT

Built 1981 Load: 32.7 t ADT: 622

S PEARSON AVENUE

Fair

Over: CAINS COULEE 095

GLENDIVE-S PEARSON AVE, Dawson, MT

Built 1965 Load: 32.7 t ADT: 100

S SARGENT AVENUE

Fair

Over: CAINS COULEE 096

GLENDIVE-S SARGENT AVE, Dawson, MT

Built 1965 Load: 32.7 t ADT: 1,019

TAYLOR AVENUE

Fair

Over: CAINS COULEE 097

GLENDIVE-S TAYLOR AVE, Dawson, MT

Built 1965 Load: 32.7 t ADT: 1,553

NORTH CABLE RD

Fair

Over: WARM SPRINGS CREEK 021

NW ANACONDA, Deer Lodge, MT

Built 1983 Load: 32.7 t ADT: 668

W RIVER RD

Fair

Over: CLARK FORK RIVER 014

6M N WARM SPRINGS, Deer Lodge, MT

Built 1981 Load: 32.7 t ADT: 100

S 7-MAIN ST N

Fair

Over: SANDSTONE CREEK

NORTH EDGE BAKER, Fallon, MT

Built 1941 Load: 32.7 t ADT: 2,196

DY TRAIL

Fair

Over: DOG CREEK 110

E WINIFRED, Fergus, MT

Built 1962 Load: 32.7 t ADT: 167

TOGNETTI RD

Fair

Over: ROSS FORK 038

5M NW MOORE, Fergus, MT

Built 1995 Load: 32.7 t ADT: 100

CRABTREE RD

Fair

Over: DRY WOLF CREEK 092

5M SE DENTON, Fergus, MT

Built 1962 Load: 32.7 t ADT: 100

PINE STREET

Fair

Over: BIG SPRING CREEK 058

LEWISTOWN-PINE ST, Fergus, MT

Built 1962 Load: 32.7 t ADT: 100

S 238-E FORK RD

Fair

Over: E FORK BIG SPRING CREEK

8M SE LEWISTOWN, Fergus, MT

Built 1958 Load: 32.7 t ADT: 216

SW ASH ST

Fair

Over: BIG SPRING CREEK

LEWISTOWN-SW ASH ST, Fergus, MT

Built 1962 Load: 32.7 t ADT: 1,386

INSIDE NORTH FORK

Fair

Over: QUARTZ CREEK

0.2 Mi. N. of Jct. Hwy. 2, Flathead, MT

Built 1965 Load: 32.7 t ADT: 75

INSIDE NORTH FORK

Fair

Over: FORD CREEK

2 Mi. N of Jct. Hwy. 2 &, Flathead, MT

Built 1965 Load: 32.7 t ADT: 50

GOING-TO-THE-SUN R

Fair

Over: MCDONALD CREEK

17.6 miles northeast of U, Flathead, MT

Built 1926 Load: 32.7 t ADT: 1,230

MEADOW LAKE BLVD

Fair

Over: RR 120

COLUMBIA FALLS, Flathead, MT

Built 1988 Load: 32.7 t ADT: 2,754

SUNNYSIDE DR

Fair

Over: ASHLEY CREEK 100

1M SW KALISPELL, Flathead, MT

Built 1988 Load: 32.7 t ADT: 100

SMITH LAKE RD

Fair

Over: ASHLEY CREEK 007

10M W KALISPELL, Flathead, MT

Built 1988 Load: 32.7 t ADT: 100

CHURCH DR

Fair

Over: STILLWATER RIVER 089

5M NW KALISPELL, Flathead, MT

Built 1978 Load: 32.7 t ADT: 100

GOOD CREEK RD

Fair

Over: STILLWATER RIVER 176

1M S OLNEY, Flathead, MT

Built 1981 Load: 32.7 t ADT: 182

COUNTY ROAD 882

Fair

Over: GOOD CREEK 079

7M SW OLNEY, Flathead, MT

Built 1988 Load: 32.7 t ADT: 100

STAR MEADOW RD

Fair

Over: LOGAN CREEK 175

19M SW OLNEY, Flathead, MT

Built 1981 Load: 32.7 t ADT: 198

MARTIN CAMP RD

Fair

Over: STILLWATER RIVER 081

5M SE OLNEY, Flathead, MT

Built 1991 Load: 32.7 t ADT: 100

W EVERGREEN DR

Fair

Over: WHITEFISH RIVER 165

KALISPELL-W EVERGREEN DR, Flathead, MT

Built 1983 Load: 32.7 t ADT: 3,593

IRR - US 2

Fair

Over: MOCCASIN CREEK

6M E WEST GLACIER, Flathead, MT

Built 1972 Load: 32.7 t ADT: 2,372

E RESERVE DR

Fair

Over: SPRING CREEK

2M NE KALISPELL, Flathead, MT

Built 1988 Load: 32.7 t ADT: 4,736

WHITEFISH STAGE RD

Fair

Over: STILLWATER RIVER

KALISPELL, Flathead, MT

Built 1975 Load: 32.7 t ADT: 7,113

I 90

Fair

Over: DARLINGTON DITCH

1.9M E THREE FORKS, Gallatin, MT

Built 1963 Load: 32.7 t ADT: 9,524

I 90

Fair

Over: DARLINGTON DITCH

1.9M E THREE FORKS, Gallatin, MT

Built 1963 Load: 32.7 t ADT: 9,524

I 90

Fair

Over: RR

BOZEMAN, Gallatin, MT

Built 1971 Load: 32.7 t ADT: 10,307

SIXTEEN MILE ROAD

Fair

Over: SIXTEEN MILE CREEK 070

MAUDLOW, Gallatin, MT

Built 1974 Load: 32.7 t ADT: 100

W CAMERON BR RD

Fair

Over: GALLATIN RIVER 048

1M SW BELGRADE, Gallatin, MT

Built 2007 Load: 32.7 t ADT: 100

COTTONWOOD RD

Fair

Over: S COTTONWOOD CREEK 123

3.5M SE GALLATIN GATEWAY, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

COTTONWOOD ROAD

Fair

Over: S COTTONWOOD CREEK 124

3.6M SE GALLATIN GATEWAY, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

CHAPMAN RD

Fair

Over: HYALITE CREEK 049

5M SW BOZEMAN, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

JOHNSON ROAD

Fair

Over: HYALITE CREEK 125

6M SW BOZEMAN, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

E GRIFFIN DR

Fair

Over: E GALLATIN RIVER 090

1M N BOZEMAN, Gallatin, MT

Built 1989 Load: 32.7 t ADT: 7,331

E TAMARACK STREET

Fair

Over: BOZEMAN CREEK 115

BOZEMAN-E TAMARACK ST, Gallatin, MT

Built 1982 Load: 32.7 t ADT: 100

US 287

Fair

Over: MADISON RIVER

3M N WEST YELLOWSTONE, Gallatin, MT

Built 1968 Load: 32.7 t ADT: 3,903

US 191 FH 42

Fair

Over: GRAYLING CREEK

14M N WEST YELLOWSTONE, Gallatin, MT

Built 1962 Load: 32.7 t ADT: 2,481

US 191 FH 42

Fair

Over: GRAYLING CREEK

15M N WEST YELLOWSTONE, Gallatin, MT

Built 1962 Load: 32.7 t ADT: 2,481

US 191 FH 42

Fair

Over: GALLATIN RIVER

14M S GALLATIN GATEWAY, Gallatin, MT

Built 1950 Load: 32.7 t ADT: 8,666

TRIDENT RD

Fair

Over: GALLATIN RIVER

1M SW TRIDENT, Gallatin, MT

Built 1975 Load: 32.7 t ADT: 487

DRY CREEK RD

Fair

Over: EAST GALLATIN RIVER

3M N BELGRADE, Gallatin, MT

Built 1957 Load: 32.7 t ADT: 2,093

S 200

Fair

Over: SAGEHEN CREEK

3M E MOSBY, Garfield, MT

Built 1973 Load: 32.7 t ADT: 532

S 200

Fair

Over: BIG DRY CREEK

13M E JORDAN, Garfield, MT

Built 2013 Load: 32.7 t ADT: 469

Showing 2,451-2,500 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.