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

OLD DARBY RD

Fair

Over: ROCK CREEK 052

4M N DARBY, Ravalli, MT

Built 1918 Load: 21.8 t ADT: 100

STEVI CUTOFF RD

Fair

Over: BITTERROOT RIVER OVERFLO

1M NW STEVENSVILLE, Ravalli, MT

Built 1951 Load: 21.8 t ADT: 7,991

OLD HWY 10

Fair

Over: WYANT COULEE 044

7M W FORSYTH, Rosebud, MT

Built 1932 Load: 21.8 t ADT: 271

OLD HWY 10

Fair

Over: RESERVATION CREEK 043

11M W FORSYTH, Rosebud, MT

Built 1936 Load: 21.8 t ADT: 271

US 12

Fair

Over: MUGGINS CREEK

1M W SUMATRA, Rosebud, MT

Built 1947 Load: 21.8 t ADT: 240

US 12

Fair

Over: DRAINAGE

INGOMAR, Rosebud, MT

Built 1947 Load: 21.8 t ADT: 144

US 12

Fair

Over: HORSE CREEK

20M NW FORSYTH, Rosebud, MT

Built 1940 Load: 21.8 t ADT: 144

S 446

Fair

Over: YELLOWSTONE RIVER

1M W ROSEBUD, Rosebud, MT

Built 1970 Load: 21.8 t ADT: 255

S 200

Fair

Over: BULL RIVER

4M NW NOXON, Sanders, MT

Built 1952 Load: 21.8 t ADT: 1,508

N MONTANA ST

Fair

Over: WALKING PATH 004

BUTTE-N MONTANA ST, Silver Bow, MT

Built 1962 Load: 21.8 t ADT: 100

LOWER SWEET GRASS

Fair

Over: YELLOWSTONE RIVER 038

SE GREYCLIFF, Sweet Grass, MT

Built 1991 Load: 21.8 t ADT: 100

OLD US 10

Fair

Over: PUMP CREEK 042

2.5M W REED POINT, Sweet Grass, MT

Built 1932 Load: 21.8 t ADT: 29

US 89

Fair

Over: TETON RIVER

1M S CHOTEAU, Teton, MT

Built 1939 Load: 21.8 t ADT: 1,257

OILMONT HWY

Fair

Over: WEST FORK WILLOW CREEK

11M E OILMONT, Toole, MT

Built 1967 Load: 21.8 t ADT: 105

S 248

Fair

Over: W FORK POPLAR RIVER

NE OF RICHLAND, Valley, MT

Built 1948 Load: 21.8 t ADT: 193

THIRD ST NE

Fair

Over: ABANDONED RR-ANTELOPE CR

HARLOWTON-THIRD ST NE, Wheatland, MT

Built 1939 Load: 21.8 t ADT: 2,051

CASTLE BUTTE RD

Fair

Over: COW GULCH 186

8M N POMPEY`S PILLAR, Yellowstone, MT

Built 1997 Load: 21.8 t ADT: 100

ELYSIAN RD

Fair

Over: HOGAN`S SLOUGH 184

BILLINGS-ELYSIAN RD, Yellowstone, MT

Built 1994 Load: 21.8 t ADT: 100

MAIN STREET

Fair

Over: ALKALI CREEK 209

BILLINGS, Yellowstone, MT

Built 1975 Load: 21.8 t ADT: 100

N 27TH ST

Fair

Over: BBWA CANAL

BILLINGS-N 27TH ST, Yellowstone, MT

Built 1947 Load: 21.8 t ADT: 11,196

1-LANE ROAD

Fair

Over: MAIN FORK ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 1952 Load: 22.0 t ADT: 50

STORM CASTLE ROAD

Fair

Over: SQ___ CREEK

CASTLE ROCK CMP-STRM CSTL, Gallatin, MT

Built 1954 Load: 22.0 t ADT: 5

RD 388

Fair

Over: HOODOO CREEK

HOODOO CREEK, Mineral, MT

Built 1957 Load: 22.0 t ADT: 50

VICTOR CROSSING W

Fair

Over: BITTERROOT RIVER 020

1M E VICTOR, Ravalli, MT

Built 1984 Load: 22.0 t ADT: 100

TAMPICO RD N

Fair

Over: BUGGY CREEK 095

2M N TAMPICO, Valley, MT

Built 2000 Load: 22.1 t ADT: 100

BASIN ST

Fair

Over: BASIN CREEK 040

BASIN, Jefferson, MT

Built 1931 Load: 22.3 t ADT: 100

HIGHLAND RD

Fair

Over: FORT BELKNAP CANAL 015

1M N LOHMAN, Blaine, MT

Built 1933 Load: 22.4 t ADT: 125

LAW RD

Fair

Over: S COTTONWOOD CREEK 011

1M E GALLATIN GATEWAY, Gallatin, MT

Built 1975 Load: 22.6 t ADT: 100

MUSSELSHELL RD

Fair

Over: MUSSELSHELL RIVER 015

6M W MUSSELSHELL, Musselshell, MT

Built 1916 Load: 22.6 t ADT: 34

SAND CREEK RD W

Fair

Over: SAND CREEK 029

7M NE ROSEBUD, Rosebud, MT

Built 1987 Load: 22.6 t ADT: 100

ROSEBUD CREEK RD

Fair

Over: ROSEBUD CREEK 048

10M SE COLSTRIP, Rosebud, MT

Built 1982 Load: 22.6 t ADT: 38

W FK AMELLS CR RD

Fair

Over: ARMELLS CREEK 038

15M NW COLSTRIP, Rosebud, MT

Built 1981 Load: 22.6 t ADT: 100

E BOULDER RD

Fair

Over: E BOULDER RIVER 031

3M S MCLEOD, Sweet Grass, MT

Built 1965 Load: 22.6 t ADT: 100

GEER RD

Fair

Over: SARGENT CREEK 001

15M N NASHUA, Valley, MT

Built 1960 Load: 22.6 t ADT: 100

HESPER RD

Fair

Over: BIG DITCH 113

5M NE LAUREL, Yellowstone, MT

Built 1938 Load: 22.6 t ADT: 519

I 15

Fair

Over: SEP RR

1.2M N MONIDA, Beaverhead, MT

Built 1981 Load: 22.7 t ADT: 1,643

I 15

Fair

Over: BEAVERHEAD RIVER

8M N CLARK CANYON DAM, Beaverhead, MT

Built 1965 Load: 22.7 t ADT: 2,210

S 43 FH 20

Fair

Over: RUBY CREEK

11M W WISDOM, Beaverhead, MT

Built 1961 Load: 22.7 t ADT: 431

S 43

Fair

Over: STEEL CREEK

1M N WISDOM, Beaverhead, MT

Built 1956 Load: 22.7 t ADT: 330

US 2

Fair

Over: DRAINAGE

3M E CHINOOK, Blaine, MT

Built 1940 Load: 22.7 t ADT: 2,067

US 2

Fair

Over: DRAINAGE

1M W ZURICH, Blaine, MT

Built 1940 Load: 22.7 t ADT: 2,067

TURNER RD

Fair

Over: N FORK WAYNE CREEK

11M NE HARLEM, Blaine, MT

Built 1947 Load: 22.7 t ADT: 61

S 78 FH 83

Fair

Over: EAST ROSEBUD CREEK

ROSCOE, Carbon, MT

Built 1959 Load: 22.7 t ADT: 478

I 15

Fair

Over: MISSOURI RIVER

7M N CRAIG, Cascade, MT

Built 1971 Load: 22.7 t ADT: 2,224

I 15

Fair

Over: MISSOURI RIVER

7M N CRAIG, Cascade, MT

Built 1971 Load: 22.7 t ADT: 2,224

CENTRAL AVE E

Fair

Over: MISSOURI RIVER

CASCADE, Cascade, MT

Built 1954 Load: 22.7 t ADT: 287

S 80

Fair

Over: BOYLE-O`HANLON COULEES

6M SE FORT BENTON, Chouteau, MT

Built 1939 Load: 22.7 t ADT: 476

S 80

Fair

Over: COWBOY STEELE CREEK

5M SE SQUARE BUTTE, Chouteau, MT

Built 1950 Load: 22.7 t ADT: 157

S 223

Fair

Over: TETON RIVER

3M NW FORT BENTON, Chouteau, MT

Built 1953 Load: 22.7 t ADT: 538

POWDERVILLE RD

Fair

Over: MIZPAH CREEK 020

43M SE MILES CITY, Custer, MT

Built 1931 Load: 22.7 t ADT: 47

Showing 1,301-1,350 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.