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

NO DATA ENTERED

Good

Over: GERMAN GULCH

GERMAN GULCH, Silver Bow, MT

Built 1966 Load: 13.3 t ADT: 50

TETRAULT RD

Good

Over: WHITEFISH RIVER 090

9M SE WHITEFISH, Flathead, MT

Built 1995 Load: 13.6 t ADT: 100

BROWNS MEADOW RD

Good

Over: MOUNT CREEK 171

13M W KALISPELL, Flathead, MT

Built 2008 Load: 13.6 t ADT: 100

GARCON GULCH ROAD

Good

Over: LITTLE BITTERROOT RIVER

7 M N HOT SPRINGS, Lake, MT

Built 2022 Load: 13.6 t ADT: 100

BULLHEAD RD

Good

Over: NO NAME COULEE 021

7M NE WILLIAMS, Pondera, MT

Built 1960 Load: 13.6 t ADT: 100

SPANISH CREEK ROAD

Good

Over: SOUTH FORK SPANISH CREEK

SPANISH CREEK, Madison, MT

Built 1967 Load: 13.9 t ADT: 50

YAAK 92

Good

Over: WEST FORK YAAK RIVER

JUST BEFORE JCT WITH 276, Lincoln, MT

Built 1976 Load: 14.3 t ADT: 99

OLD HWY RD E

Good

Over: BATTLE CREEK 025

5M E CHINOOK, Blaine, MT

Built 1938 Load: 14.5 t ADT: 100

SKYLINE DR

Good

Over: PABLO 3A CANAL 039

3M S POLSON, Lake, MT

Built 2015 Load: 14.5 t ADT: 100

MAJERUS RD

Good

Over: BULL MTN RR 023

14M SE ROUNDUP, Musselshell, MT

Built 2009 Load: 14.5 t ADT: 36

KOOTENAI CREEK RD

Good

Over: KOOTENAI CREEK 048

2M NW STEVENSVILLE, Ravalli, MT

Built 2008 Load: 14.5 t ADT: 100

17TH ST W

Good

Over: BBWA CANAL

BILLINGS-17TH ST W, Yellowstone, MT

Built 1974 Load: 14.5 t ADT: 8,983

414 S.F.CALLAHAN

Good

Over: NO FK CALLAHAN CR

0.9 MILES PAST JCT W/427, Lincoln, MT

Built 1978 Load: 14.6 t ADT: 20

NFSR 235

Good

Over: FORD CR.

FORD CR, Judith Basin, MT

Built 1983 Load: 14.9 t ADT: 50

OLD FREIGHT ROAD

Good

Over: MISSION CREEK 105

2M NW ST IGNATIUS, Lake, MT

Built 2012 Load: 14.9 t ADT: 100

NFSR 575

Good

Over: CAMAS CREEK

CAMAS CREEK, Meagher, MT

Built 1986 Load: 14.9 t ADT: 10

MILL CREEK RD.

Good

Over: MILL CREEK

NO DATA ENTERED, Park, MT

Built 2009 Load: 14.9 t ADT: 50

IRR - I 90

Good

Over: OWL CREEK

2.5M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 15.4 t ADT: 1,978

BOOTLEGGER TRAIL

Good

Over: TETON RIVER

25M NE DUTTON, Chouteau, MT

Built 1966 Load: 15.4 t ADT: 41

ALLEN ROAD

Good

Over: COFFEE CREEK

9M NE DENTON, Fergus, MT

Built 2021 Load: 15.4 t ADT: 100

MCDONALD LAKE RD

Good

Over: POST CREEK 078

6M N ST IGNATIUS, Lake, MT

Built 2015 Load: 15.4 t ADT: 100

NORRIS RD

Good

Over: HELENA VALLEY CANAL 114

4M NW HELENA, Lewis and Clark, MT

Built 1958 Load: 15.4 t ADT: 488

KELLY RD

Good

Over: PONDERA COULEE 019

5M NE CONRAD, Pondera, MT

Built 1960 Load: 15.4 t ADT: 100

ALKALI CREEK RD.

Good

Over: ALKALI CREEK

1M N BILLINGS, Yellowstone, MT

Built 2021 Load: 15.4 t ADT: 989

VERMILION RD

Good

Over: TWELVE MILE CREEK 091

4M S SHEPHERD, Yellowstone, MT

Built 2005 Load: 15.4 t ADT: 100

NO DATA ENTERED

Good

Over: BIG BEAVER

NO DATA ENTERED, Sanders, MT

Built 1976 Load: 15.6 t ADT: 20

UPPER HARB RD

Good

Over: BEAVER CREEK 095

20M E MALTA, Phillips, MT

Built 1979 Load: 15.9 t ADT: 100

COUNTY ROAD 122

Good

Over: USBR MAIN CANAL 003

3M SW SIDNEY, Richland, MT

Built 2000 Load: 15.9 t ADT: 100

ELK CREEK RD

Good

Over: ELK CREEK 113

12M S CLEARWATER JCT, Missoula, MT

Built 2005 Load: 16.2 t ADT: 100

7TH AVE N

Good

Over: MILK RIVER

HAVRE-7TH AVE N, Hill, MT

Built 1973 Load: 16.3 t ADT: 2,934

SINCLAIR CREEK RD

Good

Over: SINCLAIR CREEK 161

3M NE EUREKA, Lincoln, MT

Built 1977 Load: 16.3 t ADT: 100

RD 18720

Good

Over: WARD CREEK

WARD CREEK, Mineral, MT

Built 1972 Load: 16.3 t ADT: 50

COUNTY ROAD 405

Good

Over: USBR MAIN CANAL 005

6M SW SIDNEY, Richland, MT

Built 2006 Load: 16.3 t ADT: 100

PISHKUN RD

Good

Over: DEEP CREEK 076

14M SW CHOTEAU, Teton, MT

Built 1986 Load: 16.3 t ADT: 100

SHANNON RD

Good

Over: CANYON CREEK DITCH

2M E LAUREL, Yellowstone, MT

Built 1984 Load: 16.3 t ADT: 1,844

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Madison, MT

Built 2001 Load: 16.5 t ADT: 50

TAYLOR FORK ROAD

Good

Over: TAYLOR FORK CREEK

NO DATA ENTERED, Madison, MT

Built 2004 Load: 16.5 t ADT: 50

I 15

Good

Over: LITTLE MUDDY CREEK

6M N CASCADE, Cascade, MT

Built 1958 Load: 16.8 t ADT: 2,424

DRY FORK ROAD

Good

Over: E. BOULDER RIVER

NO DATA ENTERED, Sweet Grass, MT

Built 2007 Load: 16.8 t ADT: 50

I 15

Good

Over: BEAVERHEAD RIVER

0.6M N DILLON, Beaverhead, MT

Built 1973 Load: 17.2 t ADT: 1,996

I 15

Good

Over: BEAVERHEAD RIVER

0.6M N DILLON, Beaverhead, MT

Built 1973 Load: 17.2 t ADT: 1,996

S RAILROAD AVENUE

Good

Over: BLACKTAIL DEER CREEK 130

DILLON-S RAILROAD AVE, Beaverhead, MT

Built 2010 Load: 17.2 t ADT: 100

TULLOCK CR RD

Good

Over: TULLOCK CREEK 030

20M NE HARDIN, Big Horn, MT

Built 1985 Load: 17.2 t ADT: 35

I 15

Good

Over: LITTLE MUDDY CREEK

6M N CASCADE, Cascade, MT

Built 1958 Load: 17.2 t ADT: 2,424

GEYSER CUTOFF RD

Good

Over: COTTONWOOD CREEK 052

14M SW GERALDINE, Chouteau, MT

Built 1975 Load: 17.2 t ADT: 100

HINGHAM ROAD

Good

Over: SAGE CREEK 004

15M N HINGHAM, Hill, MT

Built 2009 Load: 17.2 t ADT: 11

US 2

Good

Over: BIG SANDY CREEK

5M W HAVRE, Hill, MT

Built 1954 Load: 17.2 t ADT: 1,457

COUNTY ROAD 290

Good

Over: HELENA VALLEY CANAL 085

N OF HELENA AIRPORT, Lewis and Clark, MT

Built 1958 Load: 17.2 t ADT: 100

S BOULDER RD

Good

Over: LWR S BOULDER RIVER 066

5M S JEFFERSON ISLAND, Madison, MT

Built 2003 Load: 17.2 t ADT: 100

HEIGHTS RD

Good

Over: LAKE FRANCIS CANAL 071

6M SW VALIER, Pondera, MT

Built 1960 Load: 17.2 t ADT: 100

Showing 3,401-3,450 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.