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

STRAUCH RD

Unknown

Over: SEP I 90 013

1M E LAUREL, Yellowstone, MT

Built 1964 ADT: 12,749

S 8TH AVE

Unknown

Over: SEP I 90 010

LAUREL-S 8TH AVE, Yellowstone, MT

Built 1967 ADT: 9,320

US 87

Unknown

Over: INT LOCKWOOD I 90

BILLINGS, Yellowstone, MT

Built 1966 ADT: 28,629

S 47

Unknown

Over: INT I 94

2M E CUSTER, Yellowstone, MT

Built 1972 ADT: 2,580

S 27TH ST

Unknown

Over: INT 27TH ST I 90

BILLINGS-S 27TH ST, Yellowstone, MT

Built 1966 ADT: 27,814

S SHILOH RD

Unknown

Over: SEP I 90

2M SW BILLINGS, Yellowstone, MT

Built 1959 ADT: 14,099

S 568-FLY CR RD

Unknown

Over: INT POMPEY'S PILLAR-I 94

1M W POMPEY`S PILLAR, Yellowstone, MT

Built 1968 ADT: 2,385

MULLOWNEY LN

Unknown

Over: LAUREL ROAD

BILLINGS-MULLOWNEY LN, Yellowstone, MT

Built 2007 ADT: 11,531

S BILLINGS BLVD

Unknown

Over: SEP BILLINGS BLVD-I 90

BILLINGS-S BILLINGS BLVD, Yellowstone, MT

Built 1963 ADT: 17,079

E AIRPORT RD

Unknown

Over: 6TH AVE N BYPASS 21

BILLINGS-E AIRPORT RD, Yellowstone, MT

Built 2009 ADT: 100

MONTANA AVE

Unknown

Over: U1025-RR

BILLINGS-MONTANA AVE, Yellowstone, MT

Built 1960 ADT: 13,008

MONTANA AVE

Unknown

Over: U1024-25-RR

BILLINGS-MONTANA AVE, Yellowstone, MT

Built 1960 ADT: 13,008

HILLTOP RD

Unknown

Over: LAKE ELMO DR

BILLINGS-HILLTOP RD, Yellowstone, MT

Built 1990 ADT: 9,629

CENTRAL AVE RAMP

Unknown

Over: UNDERPASS AVENUE

BILLINGS, Yellowstone, MT

Built 1977 ADT: 19,766

BAILEY ST

Fair

Over: JUNCTION CREEK

LIMA, Beaverhead, MT

Built 1988 ADT: 174

NO DATA ENTERED

Fair

Over: WISE RIVER

NO DATA ENTERED, Beaverhead, MT

Built 1984 ADT: 4

US287

Fair

Over: BEAVER CREEK

1 M NW WINSTON, Broadwater, MT

Built 1992 ADT: 6,537

CHERRY SPRINGS RD

Fair

Over: CLEAR CREEK 062

1M E ROBERTS, Carbon, MT

Built 1942 ADT: 100

NFSR 834

Fair

Over: BELT CREEK

JCT US 89/NFSR 834, Cascade, MT

Built 1909 ADT: 99

NFSR 1049

Fair

Over: BELT CREEK

EAST OF JCT US89/NFSR1049, Cascade, MT

Built 1909 ADT: 99

FOREST ROAD

Fair

Over: DORIS CREEK

WEST SIDE SOUTHFORK, Flathead, MT

Built 1976 ADT: 500

FOREST ROAD

Fair

Over: TUNNEL CREEK

PAOLA CREEK AREA, Flathead, MT

Built 1924 ADT: 5

Forest Road

Fair

Over: RYLE CREEK

Ryle Creek, Flathead, MT

Built 2015 ADT: 50

FOREST ROAD

Fair

Over: COAL CREEK

COAL CREEK ROAD, Flathead, MT

Built 1964 ADT: 10

RIVER RD

Fair

Over: LOWLINE CANAL 056

4M N GALLATIN GATEWAY, Gallatin, MT

Built 1933 ADT: 100

NON MAINTAINED TRL

Fair

Over: BISON CREEK

11M N ELK PARK, Jefferson, MT

Built 1984 ADT: 100

NON MAINTAINED TRL

Fair

Over: BISON CREEK

12M N ELK PARK, Jefferson, MT

Built 1984 ADT: 100

KOOCANUSA BRIDGE

Fair

Over: KOOCANUSA RESERVOIR

LAKE KOOCANUSA, Lincoln, MT

Built 1971 ADT: 75

RD 867

Fair

Over: LEIGH CR

LEIGH CREEK, Lincoln, MT

Built 1968 ADT: 50

PIPE CR RD

Fair

Over: EF PIPE CR

NO DATA ENTERED, Lincoln, MT

Built 1994 ADT: 132

RD 36

Fair

Over: WOLF CR

WOLF CREEK MP 12.8, Lincoln, MT

Built 1969 ADT: 50

RD 431

Fair

Over: ST REGIS RIVER

TWOMILE CR, Mineral, MT

Built 1957 ADT: 50

Farm Access

Fair

Over: Frenchtown Main Canal

5 mi NW of Missoula, MT, Missoula, MT

Built 1970 ADT: 10

TREVI CR RD

Fair

Over: SO FK LOLO CR

TEVIS CR, Missoula, MT

Built 1981 ADT: 50

Kraft Creek Road

Fair

Over: Swan River

5.3 M S. of Condon, Missoula, MT

Built 1954 ADT: 100

MAIN BOULDER ROAD

Fair

Over: BOULDER RIVER

40M SOUTH OF SPRINGDALE, Park, MT

Built 1940 ADT: 156

LULU PASS TRAIL RD

Fair

Over: POLAR STAR CREEK

6 M NE COOKE CITY, Park, MT

Built 2002 ADT: 100

E SAGER LANE

Fair

Over: IRRIGATION CANAL

5M S DEER LODGE, Powell, MT

Built 1990 ADT: 100

SHIELDS AVE

Fair

Over: DRAINAGE

BUTTE-SHIELDS AVE, Silver Bow, MT

Built 1958 ADT: 6,492

BRUNDAGE LN

Fair

Over: RED ROCK RIVER 052

25M NE MONIDA, Beaverhead, MT

Built 1920 Load: 2.7 t ADT: 100

BIRDTAIL RD

Fair

Over: FLAT CREEK 036

8M SE BOWMANS, Lewis and Clark, MT

Built 1901 Load: 2.7 t ADT: 100

BURLEY HILL RD

Fair

Over: HIGHWOOD CREEK 012

6M SE HIGHWOOD, Chouteau, MT

Built 1938 Load: 3.6 t ADT: 100

BOULDER CUT OFF RD

Fair

Over: BOULDER RIVER 003

10M NE WHITEHALL, Jefferson, MT

Built 1981 Load: 3.6 t ADT: 100

SAVOY RD

Fair

Over: DRAINAGE 112

W DODSON, Phillips, MT

Built 1951 Load: 3.6 t ADT: 16

DUTCH HENRY RD

Fair

Over: BEAVER CREEK 072

11M N REDSTONE, Sheridan, MT

Built 1983 Load: 3.6 t ADT: 100

AUGUSTA RD

Fair

Over: DEARBORN RIVER 011

18M S AUGUSTA, Lewis and Clark, MT

Built 1896 Load: 4.2 t ADT: 31

LOWER N FORK RD

Fair

Over: N FK BIG HOLE RIVER 069

6M N WISDOM, Beaverhead, MT

Built 1980 Load: 4.5 t ADT: 44

UPPER N FORK RD

Fair

Over: N FK BIG HOLE RIVER 063

6M NW WISDOM, Beaverhead, MT

Built 1978 Load: 4.5 t ADT: 100

BANNACK BENCH RD

Fair

Over: HORSE PRAIRE CREEK 010

1M N GRANT, Beaverhead, MT

Built 1981 Load: 4.5 t ADT: 100

TAYLOR CR RD

Fair

Over: GRASSHOPPER CREEK 004

21M W DILLON, Beaverhead, MT

Built 1986 Load: 4.5 t ADT: 100

Showing 651-700 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.