State profile · Near median Poor share

Montana bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Montana, based on the FHWA National Bridge Inventory.

5,122
Public bridges
28.3%
Good condition
6.7%
Poor condition

Data updated May 2026

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 whose lowest applicable component is rated 0-4

-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 - Poor-condition share 22.3%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Montana32.5%59.8%GoodFairPoor
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 by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Montana on the same metric.

NC

North Carolina

6.16% top marginal rate
Structure
Progressive
Burden @ $100K
$18,901

HI

Hawaii

6.47% top marginal rate
Structure
Progressive
Burden @ $100K
$1,206
Selected

MT

Montana

6.70% top marginal rate
Structure
Progressive
Burden @ $100K
$5,122

NY

New York

6.90% top marginal rate
Structure
Progressive
Burden @ $100K
$19,132

KY

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 the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

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

Poor

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

Poor

Over: SHEEP CREEK 097

12M S CASCADE, Cascade, MT

Built 1950 Load: 3.6 t ADT: 68

All Bridges in Montana

BILLINGSLEY RD

Fair

Over: VANDALIA SOUTH CANAL 074

6M W GLASGOW, Valley, MT

Built 1997 Load: 10.0 t ADT: 100

STORM CASTLE ROAD

Fair

Over: GALLATIN RIVER

STORM CASTLE CREEK, Gallatin, MT

Built 1935 Load: 10.7 t ADT: 99

TOBACCO SIDING RD

Fair

Over: TOBACCO RIVER 146

6M SE EUREKA, Lincoln, MT

Built 1950 Load: 10.8 t ADT: 100

STONE CREEK RD

Fair

Over: EAST BENCH CANAL 003

6M NE DILLON, Beaverhead, MT

Built 1962 Load: 10.9 t ADT: 100

HALL RD

Fair

Over: RED ROCK COULEE 080

6M NW CHINOOK, Blaine, MT

Built 1970 Load: 10.9 t ADT: 42

HALL RD

Fair

Over: FT. BELKNAP CANAL 08

6M NW CHINOOK, Blaine, MT

Built 1970 Load: 10.9 t ADT: 42

HAMILTON RD

Fair

Over: E GALLATIN RIVER 076

5M E CENTRAL PARK, Gallatin, MT

Built 1928 Load: 10.9 t ADT: 100

LOWER VALLEY RD -

Fair

Over: BOULDER RIVER 030

13M SE BOULDER, Jefferson, MT

Built 1977 Load: 10.9 t ADT: 100

TRUNK BUTTE RD

Fair

Over: NO NAME COULEE 078

7M N WILLIAMS, Pondera, MT

Built 1960 Load: 10.9 t ADT: 100

OLD SHELBY RD

Fair

Over: PONDERA CANAL 012

5M NW LEDGER, Pondera, MT

Built 1960 Load: 10.9 t ADT: 60

TROUT CREEK RD

Fair

Over: LITTLE BLACKFOOT R 018

AVON, Powell, MT

Built 1908 Load: 10.9 t ADT: 100

TERLAND RD

Fair

Over: BRIDGER CREEK 053

5M SE GREYCLIFF, Sweet Grass, MT

Built 1975 Load: 10.9 t ADT: 100

CACHE CREEK RD

Fair

Over: LITTLE SNAKE CREEK 048

26M N HINSDALE, Valley, MT

Built 1965 Load: 10.9 t ADT: 100

HEAD LN

Fair

Over: SEVEN MILE CREEK 149

5M NW HELENA, Lewis and Clark, MT

Built 1982 Load: 11.0 t ADT: 352

COTTONWOOD CR RD

Fair

Over: WILLOW CREEK 020

8M NW ALZADA, Carter, MT

Built 1986 Load: 11.7 t ADT: 100

EKEGREN RD

Fair

Over: THIRTY MILE CREEK 127

4M E HARLEM, Blaine, MT

Built 1930 Load: 11.8 t ADT: 100

BALLY DOME RD

Fair

Over: WOLF CREEK 089

7M E DENTON, Fergus, MT

Built 1979 Load: 11.8 t ADT: 100

VALENTINE RD

Fair

Over: BOX ELDER CREEK 130

8M E ROY, Fergus, MT

Built 1983 Load: 11.8 t ADT: 100

FOREST GROVE RD

Fair

Over: S FORK MCDONALD CR 046

6M SW GRASSRANGE, Fergus, MT

Built 1986 Load: 11.8 t ADT: 146

OLD FORTSTEELTRAIL

Fair

Over: STILLWATER RIVER 082

6M NW OLNEY, Flathead, MT

Built 1988 Load: 11.8 t ADT: 138

MONFORTON SCH RD

Fair

Over: HYALITE CREEK 105

4M W BOZEMAN, Gallatin, MT

Built 1992 Load: 11.8 t ADT: 100

RIVERSIDE RANCH RD

Fair

Over: JUDITH RIVER 012

3M W HOBSON, Judith Basin, MT

Built 1940 Load: 11.8 t ADT: 100

CEMETARY RD

Fair

Over: SO FK BUFFALO CR 011

6M NW WINNETT, Petroleum, MT

Built 1960 Load: 11.8 t ADT: 100

S 253

Fair

Over: YELLOWSTONE RIVER

1M NE TERRY, Prairie, MT

Built 1959 Load: 11.8 t ADT: 438

CHALK BUTTE RD

Fair

Over: PLENTYWOOD CREEK 009

5M SE OUTLOOK, Sheridan, MT

Built 1970 Load: 11.8 t ADT: 26

2ND LN SE

Fair

Over: GREENFIELD CANAL 052

2M SE FAIRFIELD, Teton, MT

Built 1966 Load: 11.8 t ADT: 14

S 48TH ST W

Fair

Over: CANYON CREEK DITCH 085

2M SW BILLINGS, Yellowstone, MT

Built 1981 Load: 11.8 t ADT: 1,146

NFSR 8982

Fair

Over: N FK TETON RIVER

7 LAZY P, Teton, MT

Built 1967 Load: 12.0 t ADT: 50

IRR - I 90

Fair

Over: BIGHORN RIVER

HARDIN, Big Horn, MT

Built 1971 Load: 12.6 t ADT: 4,249

LOWREY RD

Fair

Over: SUN RIVER 062

5M NW SIMMS, Cascade, MT

Built 1960 Load: 12.7 t ADT: 100

BROWN RD

Fair

Over: SAND COULEE CREEK 088

TRACY, Cascade, MT

Built 1950 Load: 12.7 t ADT: 100

ROAD 244

Fair

Over: CLEAR CREEK 017

15M SW GLENDIVE, Dawson, MT

Built 1975 Load: 12.7 t ADT: 100

ROAD 229

Fair

Over: BAD ROUTE CREEK 035

29M SW GLENDIVE, Dawson, MT

Built 1975 Load: 12.7 t ADT: 100

ALTON CUTOFF

Fair

Over: WOLF CREEK 091

4M E DENTON, Fergus, MT

Built 1979 Load: 12.7 t ADT: 100

IRR - US 2

Fair

Over: SNOWSLIDE GULCH

1M SE ESSEX, Flathead, MT

Built 1981 Load: 12.7 t ADT: 1,929

IRR - US 89

Fair

Over: ST MARYS RIVER

2M SE BABB, Glacier, MT

Built 1956 Load: 12.7 t ADT: 2,203

OVERPASS RD

Fair

Over: S PONDERA COULEE 014

3M N BRADY, Pondera, MT

Built 1982 Load: 12.7 t ADT: 100

HAWKEYE RD

Fair

Over: PONDERA COULEE 047

10M SW CONRAD, Pondera, MT

Built 1950 Load: 12.7 t ADT: 100

OLD HWY 10 W

Fair

Over: POWDER RIVER 040

6M SW TERRY, Prairie, MT

Built 1945 Load: 12.7 t ADT: 504

COUNTY ROAD 074

Fair

Over: LONE TREE CREEK 079

8M NW SIDNEY, Richland, MT

Built 1940 Load: 12.7 t ADT: 100

COUNTY ROAD 434

Fair

Over: USBR MAIN CANAL 092

1M N CRANE, Richland, MT

Built 1908 Load: 12.7 t ADT: 100

TULLOCK RD

Fair

Over: WEST BURNT CREEK 019

10M SE BIGHORN, Treasure, MT

Built 1970 Load: 12.7 t ADT: 35

S 117

Fair

Over: MILK RIVER

1M S NASHUA, Valley, MT

Built 1957 Load: 12.7 t ADT: 476

PINE UNIT RD

Fair

Over: CEDAR CREEK 010

31M SW WIBAUX, Wibaux, MT

Built 1987 Load: 12.7 t ADT: 100

GILBERT CR. RD.

Fair

Over: ROCK CR

VALLEY OF THE MOON, Missoula, MT

Built 1975 Load: 13.3 t ADT: 50

LITTLE LAKE CR RD

Fair

Over: BIG HOLE RIVER 088

3M NW JACKSON, Beaverhead, MT

Built 1974 Load: 13.6 t ADT: 100

KLINDWORTH RD

Fair

Over: WOODY ISLAND COULEE 134

7M NW HOGELAND, Blaine, MT

Built 1933 Load: 13.6 t ADT: 100

STOCKYARD RD

Fair

Over: LODGE CREEK 022

2M E CHINOOK, Blaine, MT

Built 2000 Load: 13.6 t ADT: 100

DEADMAN RD

Fair

Over: N FORK SUNDAY CREEK 011

10M NW MILES CITY, Custer, MT

Built 1913 Load: 13.6 t ADT: 100

HEEB RD

Fair

Over: BAKER CREEK 080

5M W BELGRADE, Gallatin, MT

Built 1992 Load: 13.6 t ADT: 102

Showing 801-850 of 5,122 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.