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

COUNTY ROAD 332

Fair

Over: USBR CANAL SPILLWAY 100

E EDGE SAVAGE, Richland, MT

Built 2002 Load: 17.5 t ADT: 100

SNAKE CREEK RD

Fair

Over: SNAKE CREEK 046

24M N HINSDALE, Valley, MT

Built 1986 Load: 17.5 t ADT: 14

HITCHCOCK RD

Fair

Over: DRY WOLF CREEK 096

6M SE DENTON, Fergus, MT

Built 1980 Load: 17.7 t ADT: 4

BAKER AVE

Fair

Over: WHITEFISH RIVER 113

WHITEFISH-BAKER AVE, Flathead, MT

Built 1977 Load: 17.8 t ADT: 5,913

PORCUPINE CR ROAD

Fair

Over: GALLATIN RIVER

GALLATIN CANYON, Gallatin, MT

Built 1951 Load: 17.8 t ADT: 99

COUNTY ROAD 130

Fair

Over: USBR MAIN CANAL 066

6M SW FAIRVIEW, Richland, MT

Built 2009 Load: 17.8 t ADT: 100

S 285

Fair

Over: CROW CREEK

3M SE RADERSBURG, Broadwater, MT

Built 1948 Load: 18.1 t ADT: 202

BEAR SPRINGS RD

Fair

Over: WOLF CREEK 013

11M NE DENTON, Fergus, MT

Built 1980 Load: 18.1 t ADT: 13

CUNNINGHAM RD

Fair

Over: DRY WOLF CREEK 094

6M S DENTON, Fergus, MT

Built 1982 Load: 18.1 t ADT: 100

MILLER STREET

Fair

Over: MILL DITCH 041

LEWISTOWN-MILLER ST, Fergus, MT

Built 1973 Load: 18.1 t ADT: 100

MINNEHAHA ROAD

Fair

Over: TEN MILE CREEK

INTERSECT MINNEHAHA&TENMI, Lewis and Clark, MT

Built 1955 Load: 18.1 t ADT: 30

US 93 FH 12

Fair

Over: STILLWATER RIVER

STRYKER, Lincoln, MT

Built 1955 Load: 18.1 t ADT: 2,411

S 200

Fair

Over: SKULL CREEK

18M W BROCKWAY, McCone, MT

Built 1939 Load: 18.1 t ADT: 1,012

SOUTHSIDE CROSSING

Fair

Over: CLARK FORK 015

N DRY CREEK INT, Mineral, MT

Built 1982 Load: 18.1 t ADT: 293

MESSENGER RD

Fair

Over: NO NAME COULEE 072

6M NW CONRAD, Pondera, MT

Built 1960 Load: 18.1 t ADT: 100

GOLD CREEK RD

Fair

Over: CLARK FORK RIVER 032

GOLD CREEK, Powell, MT

Built 1982 Load: 18.1 t ADT: 237

US 93

Fair

Over: KOOTENAI CREEK

6M N VICTOR, Ravalli, MT

Built 2008 Load: 18.1 t ADT: 12,937

1ST AVE NW

Fair

Over: NORTH FK FOX CREEK 090

WEST EDGE LAMBERT, Richland, MT

Built 1978 Load: 18.1 t ADT: 100

IRR - US 212

Fair

Over: TONGUE RIVER

1M W ASHLAND, Rosebud, MT

Built 1949 Load: 18.1 t ADT: 2,019

RD 7593

Fair

Over: RADIO CR

BEND VERMILLION, Sanders, MT

Built 1955 Load: 18.1 t ADT: 50

NOXON AVE E

Fair

Over: CABINET GORGE RESV 047

NOXON, Sanders, MT

Built 1922 Load: 18.1 t ADT: 100

I 90

Fair

Over: RR

6.2M E REED POINT, Stillwater, MT

Built 1962 Load: 18.1 t ADT: 5,353

1ST LN SE

Fair

Over: GREENFIELD CANAL 055

1M SE FAIRFIELD, Teton, MT

Built 1994 Load: 18.1 t ADT: 100

COUNTY LINE RD

Fair

Over: IRRIGATION CANAL 031

3M SE FAIRFIELD, Teton, MT

Built 1949 Load: 18.1 t ADT: 100

BEAVER CREEK RD

Fair

Over: LARB CREEK 106

6M SE SACO, Valley, MT

Built 1987 Load: 18.1 t ADT: 19

PRYOR CREEK RD

Fair

Over: PRYOR CREEK 001

7M S HUNTLEY, Yellowstone, MT

Built 1966 Load: 18.1 t ADT: 100

OLD HWY 312

Fair

Over: TWELVE MILE CREEK 169

2M W HUNTLEY, Yellowstone, MT

Built 1947 Load: 18.1 t ADT: 3,981

E ROSEBUD RD

Fair

Over: EAST ROSEBUD CREEK 017

ROSCOE, Carbon, MT

Built 2010 Load: 18.5 t ADT: 76

LANGOHR ROAD

Fair

Over: HYALITE CREEK

PAST LANGOHR CAMPGROUND, Gallatin, MT

Built 1952 Load: 18.5 t ADT: 50

BEAVER CREEK ROAD

Fair

Over: BEAVER CREEK

BEAVER CREEK 3, Lewis and Clark, MT

Built 2004 Load: 18.5 t ADT: 50

FDR 1077

Fair

Over: SHEEP CREEK

JUMPING CREEK CAMPGROUND, Meagher, MT

Built 1958 Load: 18.5 t ADT: 50

RD 506

Fair

Over: ST REGIS RIVER

CLIFF-RAINY CR, Mineral, MT

Built 1954 Load: 18.5 t ADT: 50

I 94

Fair

Over: YELLOWSTONE RIVER

1M N FALLON, Prairie, MT

Built 1978 Load: 18.5 t ADT: 2,191

NO DATA ENTERED

Fair

Over: VERMILION RIVER

NO DATA ENTERED, Sanders, MT

Built 1965 Load: 18.5 t ADT: 50

RiceBran access Rd

Fair

Over: East Bench Canal

11 mi NW of Dillon MT, Beaverhead, MT

Built 1962 Load: 18.8 t ADT: 20

FDR 945

Fair

Over: RUBY CR

RUBY CR, Beaverhead, MT

Built 1968 Load: 18.8 t ADT: 20

NFSR 613

Fair

Over: DRY FORK BELT CREEK

RUBY HENN, Cascade, MT

Built 1956 Load: 18.8 t ADT: 50

TRAIL CREEK RD

Fair

Over: POWDER RIVER 061

41M E MILES CITY, Custer, MT

Built 1926 Load: 18.8 t ADT: 100

HOGUM CK ROAD

Fair

Over: BLACKFOOT RIVER

HOGUM-BLACKFOOT, Lewis and Clark, MT

Built 1965 Load: 18.8 t ADT: 46

NO DATA ENTERED

Fair

Over: CEDAR CREEK

NO DATA ENTERED, Park, MT

Built 1999 Load: 18.8 t ADT: 50

NO DATA ENTERED

Fair

Over: LOST HORSE CR

NO DATA ENTERED, Ravalli, MT

Built 1968 Load: 18.8 t ADT: 14

NO DATA ENTERED

Fair

Over: LOSTHORSE CR

NO DATA ENTERED, Ravalli, MT

Built 1958 Load: 18.8 t ADT: 5

NO DATA ENTERED

Fair

Over: E FK BITTERROOT RI

NO DATA ENTERED, Ravalli, MT

Built 1969 Load: 18.8 t ADT: 9

RD 7593

Fair

Over: FISHTRAP CREEK

BEND VERMILLION, Sanders, MT

Built 1954 Load: 18.8 t ADT: 50

ROAD 261

Fair

Over: BAD ROUTE CREEK 044

21M SW GLENDIVE, Dawson, MT

Built 1921 Load: 19.0 t ADT: 21

INSIDE NORTH FORK

Fair

Over: BOWMAN CREEK

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

Built 1965 Load: 19.0 t ADT: 50

INSIDE NORTH FORK

Fair

Over: KINTLA CREEK

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

Built 1965 Load: 19.0 t ADT: 50

MANHATTAN S RD

Fair

Over: IRRIGATION CANAL 117

1M S MANHATTAN, Gallatin, MT

Built 1956 Load: 19.0 t ADT: 100

WHITETAIL RD

Fair

Over: WHITETAIL CREEK

2M N WHITEHALL, Jefferson, MT

Built 1983 Load: 19.0 t ADT: 399

COUNTY ROAD 334

Fair

Over: USBR MAIN CANAL 077

4M SW SAVAGE, Richland, MT

Built 2008 Load: 19.0 t ADT: 100

Showing 1,001-1,050 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.