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 12

Fair

Over: SANDSTONE CREEK

2M W PLEVNA, Fallon, MT

Built 1971 Load: 25.4 t ADT: 495

WINIFRED HWY

Fair

Over: DOG CREEK

4M N HILGER, Fergus, MT

Built 1953 Load: 25.4 t ADT: 474

WINIFRED HWY

Fair

Over: DRAINAGE

3M S CHRISTINA, Fergus, MT

Built 1954 Load: 25.4 t ADT: 474

WINIFRED HWY

Fair

Over: DOG CREEK

CHRISTINA, Fergus, MT

Built 1954 Load: 25.4 t ADT: 474

NORTH FORK RD

Fair

Over: WHALE CREEK 048

8M NW POLEBRIDGE, Flathead, MT

Built 1976 Load: 25.4 t ADT: 59

AMSTERDAM RD

Fair

Over: CAMP CREEK 060

AMSTERDAM, Gallatin, MT

Built 1956 Load: 25.4 t ADT: 100

US 191 FH 42

Fair

Over: GALLATIN RIVER

5M S GALLATIN GATEWAY, Gallatin, MT

Built 1958 Load: 25.4 t ADT: 10,163

I 90

Fair

Over: CLARK FORK RIVER

0.6M W BEARMOUTH, Granite, MT

Built 1970 Load: 25.4 t ADT: 11,108

S 1

Fair

Over: BOULDER CREEK

MAXVILLE, Granite, MT

Built 1986 Load: 25.4 t ADT: 1,123

I 15

Fair

Over: BOULDER RIVER

2.5M W BOULDER, Jefferson, MT

Built 1980 Load: 25.4 t ADT: 1,904

BASIN CREEK RD

Fair

Over: BASIN CREEK 032

BASIN, Jefferson, MT

Built 1960 Load: 25.4 t ADT: 100

I 15 FRONTAGE RD

Fair

Over: BOULDER RIVER 046

2M W BASIN, Jefferson, MT

Built 1985 Load: 25.4 t ADT: 100

BEAVER CREEK RD

Fair

Over: KEEP COOL CREEK 094

1M W LINCOLN, Lewis and Clark, MT

Built 1957 Load: 25.4 t ADT: 100

WOODBRIDGE DRIVE

Fair

Over: DRAINAGE 002

HELENA-WOODBRIDGE DRIVE, Lewis and Clark, MT

Built 1975 Load: 25.4 t ADT: 100

S 435

Fair

Over: SMITH CREEK

4M SW AUGUSTA, Lewis and Clark, MT

Built 1958 Load: 25.4 t ADT: 33

MELROSE RD

Fair

Over: BIG HOLE RIVER 036

2M W TWIN BRIDGES, Madison, MT

Built 1978 Load: 25.4 t ADT: 154

S 359

Fair

Over: JEFFERSON RIVER

JEFFERSON ISLAND, Madison, MT

Built 1967 Load: 25.4 t ADT: 1,402

WELDON RD

Fair

Over: SHADE CREEK 019

23M W VIDA, McCone, MT

Built 1970 Load: 25.4 t ADT: 100

S 200

Fair

Over: COTTONWOOD CREEK

8M NE CIRCLE, McCone, MT

Built 1960 Load: 25.4 t ADT: 237

S 252-HORSE CR RD

Fair

Over: DENWOODY CREEK

7M NW CIRCLE, McCone, MT

Built 1950 Load: 25.4 t ADT: 103

S 253

Fair

Over: REDWATER RIVER

NW BROCKWAY, McCone, MT

Built 1950 Load: 25.4 t ADT: 417

I 90

Fair

Over: CLARK FORK RIVER

5M E ALBERTON, Missoula, MT

Built 1964 Load: 25.4 t ADT: 4,525

US 12

Fair

Over: WILLOW CREEK

4M NE ROUNDUP, Musselshell, MT

Built 1999 Load: 25.4 t ADT: 573

OLD STAGE ROAD

Fair

Over: YELLOWSTONE RIVER 077

1M N SPRINGDALE, Park, MT

Built 1980 Load: 25.4 t ADT: 102

FRENCHMAN RD

Fair

Over: FRENCHMAN RSV SPWY 124

21M N SACO, Phillips, MT

Built 1951 Load: 25.4 t ADT: 100

STAGE RD

Fair

Over: LITTLE WARM CREEK 028

30M S DODSON, Phillips, MT

Built 1981 Load: 25.4 t ADT: 100

US HWY 91 N

Fair

Over: DRY FORK MARIAS 080

2M N CONRAD, Pondera, MT

Built 1931 Load: 25.4 t ADT: 649

US HWY 91 N

Fair

Over: PONDERA CANAL 081

8M N CONRAD, Pondera, MT

Built 1931 Load: 25.4 t ADT: 649

OLD DARBY RD

Fair

Over: BITTERROOT RIVER 074

5M N DARBY, Ravalli, MT

Built 1917 Load: 25.4 t ADT: 284

COUNTY ROAD 022

Fair

Over: HARDSCRABBLE CREEK 076

39M NW SIDNEY, Richland, MT

Built 2009 Load: 25.4 t ADT: 100

IRR - S 13

Fair

Over: SPRAGUE COULEE

23M S SCOBEY, Roosevelt, MT

Built 1931 Load: 25.4 t ADT: 179

IRR - S 344

Fair

Over: SMOKE CREEK

12M W FROID, Roosevelt, MT

Built 1960 Load: 25.4 t ADT: 90

IRR - S 344

Fair

Over: BIG MUDDY CREEK

4M W FROID, Roosevelt, MT

Built 1956 Load: 25.4 t ADT: 152

US 12

Fair

Over: DRAINAGE

32M NW FORSYTH, Rosebud, MT

Built 1941 Load: 25.4 t ADT: 144

IRR - L44235

Fair

Over: ARMELLS CREEK

22M NW COLSTRIP, Rosebud, MT

Built 1967 Load: 25.4 t ADT: 100

S 447

Fair

Over: ROSEBUD CREEK

7M SW ROSEBUD, Rosebud, MT

Built 1971 Load: 25.4 t ADT: 126

S 447

Fair

Over: ROSEBUD CREEK OVERFLOW

7M SW ROSEBUD, Rosebud, MT

Built 1971 Load: 25.4 t ADT: 126

S 200

Fair

Over: RR

3M NW NOXON, Sanders, MT

Built 1957 Load: 25.4 t ADT: 1,508

S 200

Fair

Over: CLARK FORK RIVER

1M NW TROUT CREEK, Sanders, MT

Built 1958 Load: 25.4 t ADT: 2,030

I 90

Fair

Over: BIG DITCH

5.6M W PARK CITY, Stillwater, MT

Built 1970 Load: 25.4 t ADT: 5,470

I 90

Fair

Over: BIG DITCH

5.6M W PARK CITY, Stillwater, MT

Built 1970 Load: 25.4 t ADT: 5,470

1ST ST NW

Fair

Over: COVE DITCH 005

0.5M NW PARK CITY, Stillwater, MT

Built 1935 Load: 25.4 t ADT: 100

I 90

Fair

Over: CNTY RD 113-FRYER CREEK

4.3M E SPRINGDALE, Sweet Grass, MT

Built 1983 Load: 25.4 t ADT: 6,078

WORK CREEK RD

Fair

Over: WORK CREEK 050

9M SE GREYCLIFF, Sweet Grass, MT

Built 1993 Load: 25.4 t ADT: 100

OLD US 10

Fair

Over: BRIDGER CREEK 040

6M SE GREYCLIFF, Sweet Grass, MT

Built 1931 Load: 25.4 t ADT: 342

S 91

Fair

Over: BOULDER RIVER

BIG TIMBER, Sweet Grass, MT

Built 1938 Load: 25.4 t ADT: 2,120

MAIN BOULDER RD

Fair

Over: BOULDER RIVER

3M NE MCLEOD, Sweet Grass, MT

Built 1950 Load: 25.4 t ADT: 526

I 15

Fair

Over: TETON RIVER

6M N DUTTON, Teton, MT

Built 1977 Load: 25.4 t ADT: 1,681

N DEVON RD

Fair

Over: WEST FORK WILLOW CR 005

DEVON-N DEVON RD, Toole, MT

Built 1980 Load: 25.4 t ADT: 29

AITKEN RD

Fair

Over: MILK RIVER 081

SW GLASGOW, Valley, MT

Built 1997 Load: 25.4 t ADT: 100

Showing 1,701-1,750 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.