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

IRR BIA RTE 228

Fair

Over: ROSEBUD CREEK

18 KM WEST OF LAME DEER, Big Horn, MT

Built 1983 Load: 39.4 t ADT: 10

RD 600

Fair

Over: SEVENTEEN MILE CR

SEVENTEEN MILE, Lincoln, MT

Built 1968 Load: 39.5 t ADT: 40

300-1

Fair

Over: ST REGIS RIVER

ST REGIS RIVER, Mineral, MT

Built 1955 Load: 39.5 t ADT: 50

CONNER CUTOFF RD

Fair

Over: E FORK BITTERROOT R 050

E OF CONNER, Ravalli, MT

Built 1962 Load: 39.5 t ADT: 100

LARB CREEK RD

Fair

Over: SOUTH COULEE 085

21M S SACO, Valley, MT

Built 1960 Load: 39.7 t ADT: 51

MINER LAKE RD

Fair

Over: BIG HOLE RIVER 093

2M SW JACKSON, Beaverhead, MT

Built 2004 Load: 39.9 t ADT: 100

ANDERSON LANE

Fair

Over: WEST SIDE CANAL 1

6M NE DILLON, Beaverhead, MT

Built 2012 Load: 39.9 t ADT: 53

IRR - S 451

Fair

Over: PASS CREEK

4M S WYOLA, Big Horn, MT

Built 1949 Load: 39.9 t ADT: 297

1-LANE ROAD

Fair

Over: SOUTH FORK SPRING CREEK

8 MILES SW OF RED LODGE, Carbon, MT

Built 1979 Load: 39.9 t ADT: 50

US 212

Fair

Over: THOMPSON CREEK

3M NW ALZADA, Carter, MT

Built 1965 Load: 39.9 t ADT: 2,509

CARLSON RD

Fair

Over: FLAT CREEK 034

12M E CASCADE, Cascade, MT

Built 1938 Load: 39.9 t ADT: 100

I 15 NB

Fair

Over: ABANDONED RR

0.6M S MONTANA CITY, Jefferson, MT

Built 1969 Load: 39.9 t ADT: 3,739

US 93

Fair

Over: JOCKO RIVER SIDE CHANNEL

7.5M N ARLEE, Lake, MT

Built 2006 Load: 39.9 t ADT: 8,330

ENNIS LAKE RD

Fair

Over: MADISON RIVER 032

4M E MCALLISTER, Madison, MT

Built 1990 Load: 39.9 t ADT: 383

COTTONWOOD CR RD

Fair

Over: COTTONWOOD CREEK 025

9M S MARTINSDALE, Meagher, MT

Built 1970 Load: 39.9 t ADT: 100

I 90

Fair

Over: CLARK FORK RIVER

2.5M W SUPERIOR, Mineral, MT

Built 1976 Load: 39.9 t ADT: 3,615

COLD CREEK RD

Fair

Over: SWAN RIVER 045

1M N CONDON, Missoula, MT

Built 1954 Load: 39.9 t ADT: 100

US 12

Fair

Over: DRAINAGE

3M SW MELSTONE, Musselshell, MT

Built 2003 Load: 39.9 t ADT: 358

E LAKE RD

Fair

Over: DRY FK MARIAS RIVER 030

15M W CONRAD, Pondera, MT

Built 1960 Load: 39.9 t ADT: 122

S 16

Fair

Over: USBR MAIN CANAL

4M SW CRANE, Richland, MT

Built 1984 Load: 39.9 t ADT: 2,766

IRR - S 13

Fair

Over: W FORK POPLAR R OVERFLOW

17M S SCOBEY, Roosevelt, MT

Built 2005 Load: 39.9 t ADT: 179

I 15

Fair

Over: RR (TRACKS NOT IN USE)

BUTTE, Silver Bow, MT

Built 1986 Load: 39.9 t ADT: 2,113

N MAIN ST

Fair

Over: CANAL - WALKING PATH

BUTTE-N MAIN ST, Silver Bow, MT

Built 2009 Load: 39.9 t ADT: 2,094

ARONSON AVE

Fair

Over: BBWA CANAL 203

BILLINGS-ARONSON AVE, Yellowstone, MT

Built 2008 Load: 39.9 t ADT: 10,054

NFSR #1137

Fair

Over: JOHNSON CR.

BENDER CR., Beaverhead, MT

Built 2002 Load: 40.2 t ADT: 15

I 94

Fair

Over: COTTONWOOD CREEK

21M NE MILES CITY, Custer, MT

Built 1971 Load: 40.2 t ADT: 2,111

I 94

Fair

Over: COTTONWOOD CREEK

21M NE MILES CITY, Custer, MT

Built 1971 Load: 40.2 t ADT: 2,111

NO DATA ENTERED

Fair

Over: JERRY CR

JERRY CR, Deer Lodge, MT

Built 1973 Load: 40.2 t ADT: 50

RD 763

Fair

Over: FISHER RIVER

SMOKEY HOLLOW AREA, Lincoln, MT

Built 1969 Load: 40.2 t ADT: 50

HYALITE CREEK RD

Fair

Over: BIG CREEK 065

9M SW EMIGRANT, Park, MT

Built 1990 Load: 40.5 t ADT: 100

IRR BIA RTE 131

Fair

Over: SOUTH FORK PEOPLES CREEK

4.2KM E JCT FAS 376 & 131, Blaine, MT

Built 1991 Load: 40.8 t ADT: 75

I 15 NB

Fair

Over: SUN RIVER

GREAT FALLS, Cascade, MT

Built 1966 Load: 40.8 t ADT: 5,101

I 15 SB

Fair

Over: SUN RIVER

GREAT FALLS, Cascade, MT

Built 1966 Load: 40.8 t ADT: 5,101

COUNTY ROAD 516

Fair

Over: S FK BURNS CREEK 063

14M NE BLOOMFIELD, Dawson, MT

Built 1984 Load: 40.8 t ADT: 40

CEDAR STREET

Fair

Over: WARM SPRINGS CREEK 007

ANACONDA-CEDAR ST, Deer Lodge, MT

Built 1997 Load: 40.8 t ADT: 100

COLUMBIA AVE

Fair

Over: WHITEFISH RIVER 109

WHITEFISH-COLUMBIA AVE, Flathead, MT

Built 1979 Load: 40.8 t ADT: 3,544

FRONTAGE RD-S 205

Fair

Over: RR

MANHATTAN, Gallatin, MT

Built 2010 Load: 40.8 t ADT: 2,232

IRR - US 89

Fair

Over: BADGER CREEK

15M SE BROWNING, Glacier, MT

Built 1966 Load: 40.8 t ADT: 1,184

I 15

Fair

Over: BOULDER RIVER

2.5M S BASIN, Jefferson, MT

Built 1985 Load: 40.8 t ADT: 3,141

I 15

Fair

Over: BOULDER RIVER

1.9M S BASIN, Jefferson, MT

Built 1985 Load: 40.8 t ADT: 3,141

I 15

Fair

Over: BOULDER RIVER

1.2M S BASIN, Jefferson, MT

Built 1985 Load: 40.8 t ADT: 3,141

I 90 WESTBOUND

Fair

Over: BOULDER RIVER

0.6M E CARDWELL, Jefferson, MT

Built 1968 Load: 40.8 t ADT: 5,527

FOREST ROAD

Fair

Over: SWAN RIVER

PORCUPINE CREEK ROAD, Lake, MT

Built 1956 Load: 40.8 t ADT: 20

BOOTLEGGER RD

Fair

Over: PONDERA COULEE

30M E CONRAD, Liberty, MT

Built 1984 Load: 40.8 t ADT: 18

CINNABAR BASIN RD

Fair

Over: YELLOWSTONE RIVER 068

CORWIN SPRINGS, Park, MT

Built 2008 Load: 40.8 t ADT: 100

US 12

Fair

Over: LITTLE BLACKFOOT RIVER

1M E ELLISTON, Powell, MT

Built 1988 Load: 40.8 t ADT: 3,311

S 253

Fair

Over: CHERRY CREEK

4M N TERRY, Prairie, MT

Built 2007 Load: 40.8 t ADT: 438

NO DATA ENTERED

Fair

Over: TIN CUP CREEK

NO DATA ENTERED, Ravalli, MT

Built 1972 Load: 40.8 t ADT: 5

HWY 10

Fair

Over: KEYSER CREEK

1M W COLUMBUS, Stillwater, MT

Built 2004 Load: 40.8 t ADT: 1,272

6TH LN NE

Fair

Over: GREENFIELD CANAL 042

N GREENFIELD, Teton, MT

Built 1969 Load: 40.8 t ADT: 100

Showing 3,051-3,100 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.