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

I 15

Fair

Over: RR (TRACKS NOT IN USE)

BUTTE, Silver Bow, MT

Built 1966 Load: 35.3 t ADT: 2,113

I 15 FRONTAGE RD

Fair

Over: BEAVERHEAD R-INT RAMP

8M N CLARK CANYON DAM, Beaverhead, MT

Built 1988 Load: 35.4 t ADT: 100

S 89

Fair

Over: BLACKTAIL CREEK

SOUTH DILLON, Beaverhead, MT

Built 1983 Load: 35.4 t ADT: 1,770

US 287

Fair

Over: MILLIGAN CREEK

6M SW THREE FORKS, Broadwater, MT

Built 1968 Load: 35.4 t ADT: 1,524

I 15

Fair

Over: RR-MISSOURI RIVER

8M S CASCADE, Cascade, MT

Built 1968 Load: 35.4 t ADT: 2,224

I 15

Fair

Over: RR-MISSOURI RIVER

8M S CASCADE, Cascade, MT

Built 1968 Load: 35.4 t ADT: 2,224

9TH ST N

Fair

Over: MISSOURI RIVER

GREAT FALLS-9TH-10 ST N, Cascade, MT

Built 1996 Load: 35.4 t ADT: 15,478

S 511

Fair

Over: WHITETAIL CREEK

WHITETAIL, Daniels, MT

Built 2004 Load: 35.4 t ADT: 131

S 16

Fair

Over: THIRTEEN MILE CREEK

1M SW INTAKE, Dawson, MT

Built 1969 Load: 35.4 t ADT: 2,216

US 12

Fair

Over: TIMBER CREEK

5M W BAKER, Fallon, MT

Built 1998 Load: 35.4 t ADT: 820

CIMRHAKL RD

Fair

Over: SACAGAWEA RIV 114

8M NE ROY, Fergus, MT

Built 1978 Load: 35.4 t ADT: 100

OBRYAN LN

Fair

Over: MILL CREEK 012

1M SE CRESTON, Flathead, MT

Built 2000 Load: 35.4 t ADT: 100

IRR - US 2

Fair

Over: STILLWATER RIVER

1M NE KALISPELL, Flathead, MT

Built 1966 Load: 35.4 t ADT: 13,399

I 90

Fair

Over: RR

4.3M E BOZEMAN, Gallatin, MT

Built 2006 Load: 35.4 t ADT: 9,533

I 90

Fair

Over: RR

4.3M E BOZEMAN, Gallatin, MT

Built 2006 Load: 35.4 t ADT: 9,533

S 1

Fair

Over: RR

DRUMMOND, Granite, MT

Built 1966 Load: 35.4 t ADT: 1,329

HUBBARD LN

Fair

Over: BOULDER RIVER 031

4M S BOULDER, Jefferson, MT

Built 2001 Load: 35.4 t ADT: 100

S 359

Fair

Over: JEFFERSON RIVER SLOUGH

CARDWELL, Jefferson, MT

Built 1968 Load: 35.4 t ADT: 985

3RD AVE W

Fair

Over: OTTER CREEK 036

RAYNESFORD, Judith Basin, MT

Built 1930 Load: 35.4 t ADT: 100

THERESA ADAMS LN

Fair

Over: JOCKO RIVER 057

2M E ARLEE, Lake, MT

Built 1978 Load: 35.4 t ADT: 100

COUNTY ROAD 811

Fair

Over: TEN MILE CREEK 131

W EDGE OF HELENA, Lewis and Clark, MT

Built 2005 Load: 35.4 t ADT: 100

S 24

Fair

Over: TIMBER CREEK

5M N FLOWING WELLS, McCone, MT

Built 1960 Load: 35.4 t ADT: 134

I 90

Fair

Over: ST. REGIS RVR-LOCAL RD

4.3M E DE BORGIA, Mineral, MT

Built 1979 Load: 35.4 t ADT: 7,352

S 200

Fair

Over: BLACKFOOT RIVER

10M NE POTOMAC, Missoula, MT

Built 1947 Load: 35.4 t ADT: 3,825

MULLAN RD

Fair

Over: FRENCH DITCH

5M W MISSOULA, Missoula, MT

Built 1982 Load: 35.4 t ADT: 3,120

ANDERSON RD

Fair

Over: SHIELDS RIVER 014

10M NE WILSALL, Park, MT

Built 1979 Load: 35.4 t ADT: 100

US 2

Fair

Over: BEAVER CREEK OVERFLOW

7M W SACO, Phillips, MT

Built 1968 Load: 35.4 t ADT: 1,250

S 243

Fair

Over: STINKY CREEK

9M NW SACO, Phillips, MT

Built 2003 Load: 35.4 t ADT: 39

S 243

Fair

Over: DRAINAGE

1M N SACO, Phillips, MT

Built 1936 Load: 35.4 t ADT: 252

I 90

Fair

Over: CLARK FORK RIVER

1.2M S DEER LODGE, Powell, MT

Built 1961 Load: 35.4 t ADT: 4,928

SKALKAHO HWY

Fair

Over: REPUBLICAN DITCH 063

3M S HAMILTON, Ravalli, MT

Built 1941 Load: 35.4 t ADT: 3,082

MID BURNT FORK RD

Fair

Over: NORTH BURNT FORK CR 022

4M SE STEVENSVILLE, Ravalli, MT

Built 1970 Load: 35.4 t ADT: 100

US 93

Fair

Over: S FORK BEAR CREEK

2M S VICTOR, Ravalli, MT

Built 2011 Load: 35.4 t ADT: 13,545

US 93

Fair

Over: MCCALLA CREEK

6M N VICTOR, Ravalli, MT

Built 2008 Load: 35.4 t ADT: 12,937

S 200

Fair

Over: FIRST HAY CREEK

3M SW FAIRVIEW, Richland, MT

Built 1986 Load: 35.4 t ADT: 4,273

S 16

Fair

Over: CLOVER CREEK-RR

CULBERTSON, Roosevelt, MT

Built 1957 Load: 35.4 t ADT: 1,079

S 5

Fair

Over: EAGLE CREEK

REDSTONE, Sheridan, MT

Built 2011 Load: 35.4 t ADT: 321

S 5

Fair

Over: BIG MUDDY CREEK

3M SE REDSTONE, Sheridan, MT

Built 2012 Load: 35.4 t ADT: 508

COUNTRYMAN CR RD

Fair

Over: STILLWATER RIVER 003

1M SW COLUMBUS, Stillwater, MT

Built 1988 Load: 35.4 t ADT: 100

TWO DOT HWY

Fair

Over: MUSSELSHELL RIVER 017

N EDGE TWO DOT, Wheatland, MT

Built 1965 Load: 35.4 t ADT: 100

TRUCK ROUTE RD

Fair

Over: YATES CREEK 003

EAST WIBAUX, Wibaux, MT

Built 1939 Load: 35.4 t ADT: 53

S SHILOH RD

Fair

Over: BBWA CANAL

2M W BILLINGS, Yellowstone, MT

Built 2000 Load: 35.4 t ADT: 12,427

FOREST ROAD

Fair

Over: TIGER CREEK

ROAD 38, Flathead, MT

Built 1965 Load: 35.6 t ADT: 200

NO DATA ENTERED

Fair

Over: ROSS FORK

ROSS FORK, Granite, MT

Built 1967 Load: 35.6 t ADT: 50

NO DATA ENTERED

Fair

Over: ST REGIS RIVER

NO DATA ENTERED, Mineral, MT

Built 1900 Load: 35.6 t ADT: 50

MAIN ST

Fair

Over: CLARK FORK RIVER

S DEER LODGE, Powell, MT

Built 1949 Load: 35.6 t ADT: 2,287

BRACKETT CR RD

Fair

Over: BRACKETT CREEK 121

19M N BOZEMAN, Gallatin, MT

Built 1989 Load: 35.7 t ADT: 257

FLAT CREEK ROAD

Fair

Over: SUTTON CREEK

SUTTON CREEK, Lincoln, MT

Built 1980 Load: 36.0 t ADT: 40

SPOOK LAKE RD

Fair

Over: OWL CREEK

SPOOK LAKE, Missoula, MT

Built 1980 Load: 36.0 t ADT: 50

IRR BIA RTE 30

Fair

Over: MAIN CANAL

7.2 KM SW OF OSWEGO, Valley, MT

Built 1983 Load: 36.0 t ADT: 225

Showing 2,851-2,900 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.