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

FAIRVIEW RD

Poor

Over: S FORK MCDONALD CR 123

3M E FORESTGROVE, Fergus, MT

Built 1962 Load: 30.8 t ADT: 100

SLOWAY FRNTGE RD E

Poor

Over: ABANDONED RR 001

5M E ST REGIS, Mineral, MT

Built 1956 Load: 30.8 t ADT: 100

IRR - S 382

Poor

Over: RR

1M E PERMA, Sanders, MT

Built 1965 Load: 30.8 t ADT: 384

S 78

Poor

Over: YELLOWSTONE RIVER

COLUMBUS, Stillwater, MT

Built 1957 Load: 30.8 t ADT: 4,987

S 556-THOMPSON R R

Poor

Over: THOMPSON RIVER

26M NE THOMPSON FALLS, Sanders, MT

Built 1992 Load: 31.0 t ADT: 3

US 2

Poor

Over: DRAINAGE

4M E CHINOOK, Blaine, MT

Built 1940 Load: 31.8 t ADT: 2,067

I 90

Poor

Over: CLARK FORK RIVER

5M W DRUMMOND, Granite, MT

Built 1970 Load: 31.8 t ADT: 11,980

TURAH RD

Poor

Over: CLARK FORK 103

4M SE BONNER, Missoula, MT

Built 1962 Load: 31.8 t ADT: 100

S 91

Poor

Over: BOULDER RIVER OVERFLOW

BIG TIMBER, Sweet Grass, MT

Built 1937 Load: 31.8 t ADT: 2,120

BIG CREEK ROAD

Poor

Over: GOOD CREEK

GOOD CREEK, Lincoln, MT

Built 1972 Load: 32.4 t ADT: 50

I 94

Poor

Over: CLEAR CREEK

10M SW GLENDIVE, Dawson, MT

Built 1973 Load: 32.7 t ADT: 4,277

HOLT STAGE RD

Poor

Over: FLATHEAD RIV OVERFL0 014

2M E KALISPELL, Flathead, MT

Built 1992 Load: 32.7 t ADT: 100

US 191 FH 42

Poor

Over: TEEPEE CREEK

11M N WEST YELLOWSTONE, Gallatin, MT

Built 1962 Load: 32.7 t ADT: 2,481

JOCKO CANYON RD

Poor

Over: JOCKO RIVER 011

4M E ARLEE, Lake, MT

Built 1975 Load: 32.7 t ADT: 100

W 2ND ST

Poor

Over: FLOWER CREEK 123

NW EDGE LIBBY, Lincoln, MT

Built 1969 Load: 32.7 t ADT: 100

S 37 FH 57

Poor

Over: CRIPPLE HORSE CREEK

6M NE LIBBY DAM, Lincoln, MT

Built 1974 Load: 32.7 t ADT: 449

S 37 FH 57

Poor

Over: ROCK GUT

22M N LIBBY DAM, Lincoln, MT

Built 1974 Load: 32.7 t ADT: 324

S 37 FH 57

Poor

Over: CADETTE CREEK

7M S REXFORD, Lincoln, MT

Built 1971 Load: 32.7 t ADT: 601

S 37 FH 57

Poor

Over: TOBACCO RIVER

2M E REXFORD, Lincoln, MT

Built 1971 Load: 32.7 t ADT: 1,315

KOOTENAI RIVER RD

Poor

Over: PIPE CREEK

4M N LIBBY, Lincoln, MT

Built 1987 Load: 32.7 t ADT: 689

SEYLER LN

Poor

Over: RUBY RIVER 019

7M NW SHERIDAN, Madison, MT

Built 1976 Load: 32.7 t ADT: 100

HWY 10 W

Poor

Over: NINEMILE CREEK 035

3M W HUSON, Missoula, MT

Built 1924 Load: 32.7 t ADT: 140

LOLO ST

Poor

Over: RATTLESNAKE CREEK 009

MISSOULA-LOLO STREET, Missoula, MT

Built 1966 Load: 32.7 t ADT: 2,349

I 90 EB

Poor

Over: RR

4.3M W GARRISON, Powell, MT

Built 1973 Load: 32.7 t ADT: 5,915

I 90

Poor

Over: RR

4.3M W GARRISON, Powell, MT

Built 1973 Load: 32.7 t ADT: 5,915

MID BURNT FORK RD

Poor

Over: BITTERROOT CANAL 089

4M E STEVENSVILLE, Ravalli, MT

Built 1984 Load: 32.7 t ADT: 100

POPLAR RIVER RD

Poor

Over: POPLAR RIVER 015

22M N POPLAR, Roosevelt, MT

Built 1985 Load: 32.7 t ADT: 659

LIL BITTERROOT RD

Poor

Over: LITTLE BITTERROOT RV 070

8M E HOT SPRINGS, Sanders, MT

Built 1978 Load: 32.7 t ADT: 100

TAMPICO RD

Poor

Over: VANDALIA SOUTH CANAL 003

NW TAMPICO, Valley, MT

Built 2002 Load: 32.7 t ADT: 28

RD 128

Poor

Over: FLOWER CR

1 MI ABOVE RESERVOIR, Lincoln, MT

Built 1961 Load: 33.0 t ADT: 50

RD 231

Poor

Over: HOWARD CR

1 MI BELOW HOWARD LAKE, Lincoln, MT

Built 1976 Load: 33.0 t ADT: 50

FDR 209

Poor

Over: W FK MADISON RIVER

W FK MADISON RIVER, Madison, MT

Built 1970 Load: 33.4 t ADT: 30

IRR - US 2

Poor

Over: MILK RIVER

FORT BELKNAP AGENCY, Blaine, MT

Built 1964 Load: 33.6 t ADT: 3,196

S 200

Poor

Over: STOCKPASS

23M SW SIMMS, Lewis and Clark, MT

Built 1949 Load: 33.6 t ADT: 1,382

CB ROUTE RD

Poor

Over: BR MAIN CANAL 035

3M NE FALLON, Prairie, MT

Built 1928 Load: 33.6 t ADT: 80

US 191

Poor

Over: RYE CREEK

2M S MELVILLE, Sweet Grass, MT

Built 1947 Load: 33.6 t ADT: 657

68, S.FORK YAAK RD

Poor

Over: SOUTH FORK YAAK RIVER

JUST PAST JCT WITH 746, Lincoln, MT

Built 1953 Load: 33.7 t ADT: 99

FOREST ROAD

Poor

Over: GOOD CREEK

GREGG CREEK ROAD, Flathead, MT

Built 1962 Load: 34.3 t ADT: 20

S MAIN STREET

Poor

Over: CLARK FORK RIVER 020

S DRUMMOND, Granite, MT

Built 1934 Load: 34.5 t ADT: 565

IRR - US 89

Poor

Over: BLACKTAIL CREEK

16M NW VALIER, Pondera, MT

Built 1965 Load: 34.5 t ADT: 947

NO DATA ENTERED

Poor

Over: CHAFFIN CR

NO DATA ENTERED, Ravalli, MT

Built 1947 Load: 35.3 t ADT: 10

PLEASANT VIEW RD

Poor

Over: SEVEN MILE CREEK 025

3M W GLENDIVE, Dawson, MT

Built 1983 Load: 35.4 t ADT: 50

S 287

Poor

Over: WEBER IRRIGATION CANAL

2M SW ENNIS, Madison, MT

Built 1950 Load: 35.4 t ADT: 2,257

I 90

Poor

Over: CLARK FORK RIVER

3.7M W SUPERIOR, Mineral, MT

Built 1984 Load: 35.4 t ADT: 3,615

RD 615

Poor

Over: PIPE CREEK

BARRON BLUE, Lincoln, MT

Built 1962 Load: 35.6 t ADT: 50

LIGHT RD

Poor

Over: PABLO 31A CANAL 036

5M S POLSON, Lake, MT

Built 2009 Load: 35.7 t ADT: 287

PLACID LAKE RD

Poor

Over: OWL CREEK 077

3M S SEELEY LAKE, Missoula, MT

Built 1970 Load: 35.7 t ADT: 100

COUNTY ROAD 524

Poor

Over: N FK THIRTEN MILE CR 091

9M NE BLOOMFIELD, Dawson, MT

Built 1983 Load: 36.3 t ADT: 100

IRR - US 93

Poor

Over: NINE PIPE RESERVOIR

5M S RONAN, Lake, MT

Built 1933 Load: 36.3 t ADT: 7,072

S 204-STAGE RD

Poor

Over: DODSON SOUTH CANAL

1M S DODSON, Phillips, MT

Built 1954 Load: 36.3 t ADT: 99

Showing 5,001-5,050 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.