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

JOCKO CANYON RD

Fair

Over: JOCKO RIVER 012

7M E ARLEE, Lake, MT

Built 1976 Load: 24.5 t ADT: 100

N VALLEY CREEK RD

Fair

Over: VALLEY CREEK 055

3M S RAVALLI, Lake, MT

Built 1960 Load: 24.5 t ADT: 451

S RECREATION RD

Fair

Over: SHEEP CREEK 117

2M S WOLF CREEK, Lewis and Clark, MT

Built 1933 Load: 24.5 t ADT: 390

LAKE HELENA DR

Fair

Over: CAUSEWAY-LAKE HELENA 072

8M N EAST HELENA, Lewis and Clark, MT

Built 1944 Load: 24.5 t ADT: 861

GLASS DR

Fair

Over: HELENA VALLEY CANAL 150

11M N HELENA, Lewis and Clark, MT

Built 1958 Load: 24.5 t ADT: 615

STEMPLE PASS RD

Fair

Over: BLACKFOOT RIVER 118

.5M S LINCOLN, Lewis and Clark, MT

Built 1959 Load: 24.5 t ADT: 299

US 2

Fair

Over: SWAMP CREEK

11M S LIBBY, Lincoln, MT

Built 2013 Load: 24.5 t ADT: 1,597

S 287

Fair

Over: RAMSHORN CREEK

2M N LAURIN, Madison, MT

Built 1940 Load: 24.5 t ADT: 1,862

S 41

Fair

Over: JEFFERSON RIVER

3M S SILVERSTAR, Madison, MT

Built 1992 Load: 24.5 t ADT: 1,899

S 41

Fair

Over: BEAVERHEAD RIVER

12M SW TWIN BRIDGES, Madison, MT

Built 1949 Load: 24.5 t ADT: 2,326

S 252-HORSE CR RD

Fair

Over: HORSE CREEK

1M W CIRCLE, McCone, MT

Built 1950 Load: 24.5 t ADT: 197

S 467-UNION RD

Fair

Over: REDWATER RIVER

1M S CIRCLE, McCone, MT

Built 1962 Load: 24.5 t ADT: 126

I 90

Fair

Over: ST. REGIS RVR-INT RAMP

3.7M W ST. REGIS, Mineral, MT

Built 1981 Load: 24.5 t ADT: 22

MULLAN GULCH RD

Fair

Over: ROCK CREEK 013

HENDERSON, Mineral, MT

Built 1931 Load: 24.5 t ADT: 147

E FRONT ST

Fair

Over: RATTLESNAKE CREEK

MISSOULA-E FRONT ST, Missoula, MT

Built 1932 Load: 24.5 t ADT: 1,568

BRACKETT CREEK RD

Fair

Over: SHIELDS RIVER 007

W CLYDE PARK, Park, MT

Built 1980 Load: 24.5 t ADT: 273

MAIN BOULDER RD

Fair

Over: BOULDER RIVER 040

31M S SPRINGDALE, Park, MT

Built 1938 Load: 24.5 t ADT: 156

US 89

Fair

Over: SHIELDS RIVER

1M N CLYDE PARK, Park, MT

Built 1981 Load: 24.5 t ADT: 1,247

ROAD 317

Fair

Over: ALKALI CREEK

SECT 1 T18N R29E, Petroleum, MT

Built 1963 Load: 24.5 t ADT: 2

IRR BIA ROUTE 8

Fair

Over: PEOPLES CREEK

40 KM SE FT. BELKNAP AGCY, Phillips, MT

Built 1976 Load: 24.5 t ADT: 200

MIDALE RD

Fair

Over: SECOND CREEK 047

43M S MALTA, Phillips, MT

Built 1983 Load: 24.5 t ADT: 100

S 9TH ST W

Fair

Over: DODSON SOUTH CANAL 096

SW MALTA-9TH ST, Phillips, MT

Built 1950 Load: 24.5 t ADT: 100

IRR BIA RTE 1

Fair

Over: BIRCH CREEK

13 KM SE OF HEART BUTTE, Pondera, MT

Built 1966 Load: 24.5 t ADT: 700

I 94

Fair

Over: RR

SW FALLON, Prairie, MT

Built 1977 Load: 24.5 t ADT: 1,914

S 253

Fair

Over: BRACKETT CREEK

8M NW TERRY, Prairie, MT

Built 1935 Load: 24.5 t ADT: 402

US 93

Fair

Over: BITTERROOT RIVER

3M S HAMILTON, Ravalli, MT

Built 1949 Load: 24.5 t ADT: 6,789

WOODSIDE CUTOFF RD

Fair

Over: BITTERROOT RIVER

WOODSIDE, Ravalli, MT

Built 1954 Load: 24.5 t ADT: 6,621

S 531-WESTSIDE RD

Fair

Over: ROARING LION CREEK

1M SW HAMILTON, Ravalli, MT

Built 1972 Load: 24.5 t ADT: 509

COUNTY ROAD 018

Fair

Over: WEST CHARLIE CREEK 045

52M NW SIDNEY, Richland, MT

Built 1994 Load: 24.5 t ADT: 100

COUNTY ROAD 130

Fair

Over: FIRST HAY CREEK 098

6M N SIDNEY, Richland, MT

Built 2009 Load: 24.5 t ADT: 100

IRR - S 13

Fair

Over: W FORK POPLAR R OVRFLOW

17M S SCOBEY, Roosevelt, MT

Built 1932 Load: 24.5 t ADT: 179

IRR BIA RTE 4

Fair

Over: TONGUE RIVER

AT BIRNEY VILLAGE, Rosebud, MT

Built 1970 Load: 24.5 t ADT: 800

IRR BIA RTE 204

Fair

Over: ROSEBUD CREEK

4.8 KM NW OF LAME DEER, Rosebud, MT

Built 1971 Load: 24.5 t ADT: 60

I 94

Fair

Over: ARMELLS CR-RR

6M W FORSYTH, Rosebud, MT

Built 1972 Load: 24.5 t ADT: 2,138

OLD HWY 10

Fair

Over: SWEENEY CREEK 064

7M E ROSEBUD, Rosebud, MT

Built 1930 Load: 24.5 t ADT: 127

US 12

Fair

Over: DRAINAGE

3M E SUMATRA, Rosebud, MT

Built 1947 Load: 24.5 t ADT: 144

S 566-TONGUE R RD

Fair

Over: HANGING WOMAN CREEK

SW BIRNEY, Rosebud, MT

Built 1975 Load: 24.5 t ADT: 44

W RESERVE HWY

Fair

Over: BIG MUDDY CREEK OVERFLOW

1M E RESERVE, Sheridan, MT

Built 1949 Load: 24.5 t ADT: 150

S 43

Fair

Over: DIVIDE CREEK

DIVIDE, Silver Bow, MT

Built 1956 Load: 24.5 t ADT: 673

I 90

Fair

Over: KEYSER CREEK

1.2M W COLUMBUS, Stillwater, MT

Built 1971 Load: 24.5 t ADT: 5,961

I 90

Fair

Over: KEYSER CREEK

1.2M W COLUMBUS, Stillwater, MT

Built 1971 Load: 24.5 t ADT: 5,961

NYE RD-S 419

Fair

Over: STILLWATER RIVER

NYE, Stillwater, MT

Built 1945 Load: 24.5 t ADT: 721

1ST RD SW

Fair

Over: SPRING VALLEY CANAL 046

15M NW FAIRFIELD, Teton, MT

Built 1986 Load: 24.5 t ADT: 100

F BRIDGE RD

Fair

Over: MARIAS RIVER

12M SE SHELBY, Toole, MT

Built 1953 Load: 24.5 t ADT: 55

IRR BIA RTE 10

Fair

Over: OSWEGO EAST MAIN CANAL

1.6 KM SE OF OSWEGO, Valley, MT

Built 1972 Load: 24.5 t ADT: 50

IRR BIA ROUTE 1

Fair

Over: LITTLE PORCUPINE CREEK

3.5 KM SW OF FRAZIER, Valley, MT

Built 1976 Load: 24.5 t ADT: 1,200

IRR BIA ROUTE 1

Fair

Over: MAIN CANAL

1.0 KM SW OF OSWEGO, Valley, MT

Built 1976 Load: 24.5 t ADT: 1,200

NEW DEAL RD

Fair

Over: GALPIN COULEE 073

2M NW FT PECK, Valley, MT

Built 1960 Load: 24.5 t ADT: 100

LOGAN ST SE

Fair

Over: ANTELOPE CREEK 019

SE EDGE HARLOWTON, Wheatland, MT

Built 1931 Load: 24.5 t ADT: 100

US 12

Fair

Over: DAISY DEAN CREEK

5M W TWO DOT, Wheatland, MT

Built 1933 Load: 24.5 t ADT: 499

Showing 1,601-1,650 of 5,122 bridges

Related

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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.