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

S 556-THOMPSON R R

Fair

Over: THOMPSON RIVER

25M SW MARION, Flathead, MT

Built 1994 Load: 23.6 t ADT: 60

I 90

Fair

Over: MADISON RIVER-RR

0.6M E THREE FORKS, Gallatin, MT

Built 1964 Load: 23.6 t ADT: 9,524

US 191 FH 42

Fair

Over: GALLATIN RIVER

4M NE BIG SKY, Gallatin, MT

Built 1952 Load: 23.6 t ADT: 8,666

FRONTAGE RD-S 205

Fair

Over: CAMP CREEK

2M SE MANHATTAN, Gallatin, MT

Built 1920 Load: 23.6 t ADT: 2,232

VAN NORMAN RD

Fair

Over: BIG DRY CREEK 016

26M NE JORDAN, Garfield, MT

Built 1959 Load: 23.6 t ADT: 100

S 462

Fair

Over: LITTLE DRY CREEK

19M N ROCK SPRINGS, Garfield, MT

Built 1960 Load: 23.6 t ADT: 50

DUCK LAKE RD

Fair

Over: CUT BANK CREEK

4M N BROWNING, Glacier, MT

Built 1965 Load: 23.6 t ADT: 1,040

S 1

Fair

Over: FLINT CREEK

4M N MAXVILLE, Granite, MT

Built 1931 Load: 23.6 t ADT: 1,123

ROAD 15 N

Fair

Over: SAGE CREEK 035

24M N JOPLIN, Hill, MT

Built 1976 Load: 23.6 t ADT: 100

7TH AVE N

Fair

Over: RR

HAVRE-7TH AVE N, Hill, MT

Built 1936 Load: 23.6 t ADT: 3,384

S 80

Fair

Over: WOLF CREEK

6M NE STANFORD, Judith Basin, MT

Built 1934 Load: 23.6 t ADT: 243

TERRACE LAKE RD

Fair

Over: N CROW CREEK 021

1M E RONAN, Lake, MT

Built 1965 Load: 23.6 t ADT: 100

CRAIG FRONTAGE RD

Fair

Over: WEGNER CREEK 055

CRAIG, Lewis and Clark, MT

Built 1934 Load: 23.6 t ADT: 327

S 200

Fair

Over: LANDERS FORK

4M NE LINCOLN, Lewis and Clark, MT

Built 1938 Load: 23.6 t ADT: 1,982

LINCOLN RD W

Fair

Over: LITTLE PRICKLY PEAR CR

2M NW CANYON CREEK, Lewis and Clark, MT

Built 1949 Load: 23.6 t ADT: 394

LINCOLN RD W

Fair

Over: CANYON CREEK

6M NW CANYON CREEK, Lewis and Clark, MT

Built 1949 Load: 23.6 t ADT: 394

LOON LAKE RD

Fair

Over: FORTINE CREEK 131

W TREGO, Lincoln, MT

Built 1981 Load: 23.6 t ADT: 100

CLIFF LAKE RD

Fair

Over: MADISON RIVER 045

36M S ENNIS, Madison, MT

Built 2001 Load: 23.6 t ADT: 100

S 287

Fair

Over: ALDER CREEK

LAURIN, Madison, MT

Built 1940 Load: 23.6 t ADT: 1,862

DIAMOND MATCH RD

Fair

Over: RR

3M SE SUPERIOR, Mineral, MT

Built 1955 Load: 23.6 t ADT: 703

S 200 EB

Fair

Over: BLACKFOOT RIVER

5M W POTOMAC, Missoula, MT

Built 1940 Load: 23.6 t ADT: 2,301

PINE CREEK RD

Fair

Over: YELLOWSTONE RIVER 069

1M W PINE CREEK, Park, MT

Built 1990 Load: 23.6 t ADT: 360

S 244

Fair

Over: PIKE CREEK

FLATWILLOW, Petroleum, MT

Built 1939 Load: 23.6 t ADT: 232

S 244

Fair

Over: DRAINAGE

FLATWILLOW, Petroleum, MT

Built 1935 Load: 23.6 t ADT: 232

UPPER HARB RD

Fair

Over: DRAINAGE 057

16M E MALTA, Phillips, MT

Built 1950 Load: 23.6 t ADT: 100

US 2

Fair

Over: MILK RIVER

NW EDGE MALTA, Phillips, MT

Built 1952 Load: 23.6 t ADT: 3,647

IRR - US 191

Fair

Over: LITTLE WARM CREEK

31M SW MALTA, Phillips, MT

Built 1947 Load: 23.6 t ADT: 375

IRR - US 191

Fair

Over: WILD HORSE CR OVERFLOW

21M SW MALTA, Phillips, MT

Built 1941 Load: 23.6 t ADT: 375

IRR - US 191

Fair

Over: ALKALI CREEK

7M SW MALTA, Phillips, MT

Built 1994 Load: 23.6 t ADT: 413

S FRONTAGE RD 011

Fair

Over: DEMPSEY CREEK 059

5M S DEER LODGE, Powell, MT

Built 1930 Load: 23.6 t ADT: 899

S 141

Fair

Over: BLACKFOOT RIVER

7M NE HELMVILLE, Powell, MT

Built 2004 Load: 23.6 t ADT: 1,643

NO DATA ENTERED

Fair

Over: OVERWHICH CR

NO DATA ENTERED, Ravalli, MT

Built 1972 Load: 23.6 t ADT: 2

BOWMAN RD

Fair

Over: BLODGETT CREEK 024

2M NW HAMILTON, Ravalli, MT

Built 1993 Load: 23.6 t ADT: 1,922

US 93 FH 19

Fair

Over: E FORK BITTERROOT RIVER

5M SE CONNER, Ravalli, MT

Built 1937 Load: 23.6 t ADT: 1,069

S 16

Fair

Over: USBR MAIN CANAL

1M N SAVAGE, Richland, MT

Built 1974 Load: 23.6 t ADT: 2,407

IRR - SR 480

Fair

Over: MISSOURI RIVER

9M SW BROCKTON, Richland, MT

Built 1968 Load: 23.6 t ADT: 134

IRRCOUNTY ROAD 380

Fair

Over: SMOKE CREEK 017

20M N BROCKTON, Roosevelt, MT

Built 1957 Load: 23.6 t ADT: 100

IRR - S 13

Fair

Over: MIDWAY COULEE

21M S SCOBEY, Roosevelt, MT

Built 1932 Load: 23.6 t ADT: 179

IRR - S 39

Fair

Over: RR

21M NW OF COLSTRIP, Rosebud, MT

Built 1983 Load: 23.6 t ADT: 868

IRR - S 39

Fair

Over: ARMELLS CREEK

22M NW OF COLSTRIP, Rosebud, MT

Built 1983 Load: 23.6 t ADT: 868

S 56 FH 5

Fair

Over: BULL RIVER

17M NW NOXON, Sanders, MT

Built 1960 Load: 23.6 t ADT: 679

S 5

Fair

Over: MAIN CREEK

9M SW WESTBY, Sheridan, MT

Built 1939 Load: 23.6 t ADT: 307

I 90

Fair

Over: RR

6.2M E REED POINT, Stillwater, MT

Built 1976 Load: 23.6 t ADT: 5,353

REED POINT RD

Fair

Over: YELLOWSTONE RIVER 004

NW REED POINT, Stillwater, MT

Built 2000 Load: 23.6 t ADT: 174

OLD US 10

Fair

Over: BIG DITCH 010

PARK CITY, Stillwater, MT

Built 1928 Load: 23.6 t ADT: 726

I 90

Fair

Over: JARRETT CR FARM ACCESS

3.1M E SPRINGDALE, Sweet Grass, MT

Built 1981 Load: 23.6 t ADT: 6,078

I 90

Fair

Over: BRIDGER CREEK

6.8M E GREYCLIFF, Sweet Grass, MT

Built 1972 Load: 23.6 t ADT: 5,353

US 191

Fair

Over: SWEET GRASS CREEK

2M S MELVILLE, Sweet Grass, MT

Built 1947 Load: 23.6 t ADT: 657

MAIN BOULDER RD

Fair

Over: BOULDER RIVER

8M S BIG TIMBER, Sweet Grass, MT

Built 1975 Load: 23.6 t ADT: 526

MAIN BOULDER RD

Fair

Over: WEST BOULDER RIVER

MCLEOD, Sweet Grass, MT

Built 1976 Load: 23.6 t ADT: 526

Showing 1,451-1,500 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.