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

FDR 109

Good

Over: S FK TETON RIVER

3.5 MI. SW OF JCT 144/109, Teton, MT

Built 1965 Load: 29.8 t ADT: 99

BANNACK BENCH RD

Good

Over: GRASSHOPPER CREEK 009

BANNACK, Beaverhead, MT

Built 2012 Load: 29.9 t ADT: 100

BACK LOOP RD

Good

Over: LITTLE BIGHORN RIVER 023

1M N WYOLA, Big Horn, MT

Built 1986 Load: 29.9 t ADT: 100

ZURICH RD

Good

Over: MILK RIVER 033

S ZURICH, Blaine, MT

Built 1993 Load: 29.9 t ADT: 100

SIMMS CASCADE RD

Good

Over: FORT SHAW CANAL 041

2M SW SIMMS, Cascade, MT

Built 1938 Load: 29.9 t ADT: 100

US 89

Good

Over: RR

VAUGHN, Cascade, MT

Built 2002 Load: 29.9 t ADT: 5,533

US 89 FH 32

Good

Over: BELT CREEK

3M S BELT, Cascade, MT

Built 1968 Load: 29.9 t ADT: 702

FRENCH LN

Good

Over: POPLAR RIVER 009

4M NW SCOBEY, Daniels, MT

Built 2003 Load: 29.9 t ADT: 99

FOREST GROVE RD

Good

Over: S FORK MCDONALD CR

6M SW GRASSRANGE, Fergus, MT

Built 2021 Load: 29.9 t ADT: 146

JOYLAND RD

Good

Over: BIG SPRING CREEK

2M NW LEWISTOWN, Fergus, MT

Built 1999 Load: 29.9 t ADT: 66

FISH HATCHERY RD

Good

Over: BIG SPRING CREEK

5M SE LEWISTOWN, Fergus, MT

Built 1996 Load: 29.9 t ADT: 161

GOLDENSTEIN LN

Good

Over: SOURDOUGH CREEK 053

1M S BOZEMAN, Gallatin, MT

Built 1982 Load: 29.9 t ADT: 100

IRR - S 358

Good

Over: SPRING CREEK

5M S CUT BANK, Glacier, MT

Built 1968 Load: 29.9 t ADT: 265

S 3

Good

Over: PAINTED ROBE CREEK

6M S LAVINA, Golden Valley, MT

Built 1993 Load: 29.9 t ADT: 1,847

MT 38-SKALKAHO RD

Good

Over: ROCK CREEK 013

10M W PORTERS CORNER, Granite, MT

Built 1989 Load: 29.9 t ADT: 273

US 87

Good

Over: WOLF CREEK

1M W STANFORD, Judith Basin, MT

Built 1993 Load: 29.9 t ADT: 2,230

STASSO ROAD

Good

Over: PABLO CANAL 37A4

5 MILES SOUTH OF POLSON, Lake, MT

Built 2020 Load: 29.9 t ADT: 100

BRIDGE ST

Good

Over: MISSOURI RIVER 062

CRAIG, Lewis and Clark, MT

Built 2006 Load: 29.9 t ADT: 773

GREEN MEADOW DR

Good

Over: TEN MILE CREEK

1M N HELENA, Lewis and Clark, MT

Built 1992 Load: 29.9 t ADT: 4,808

GREEN MEADOW DR

Good

Over: HELENA VALLEY CANAL

2M N HELENA, Lewis and Clark, MT

Built 1992 Load: 29.9 t ADT: 4,483

MOFFAT RD

Good

Over: MARIAS RIVER 011

17M S CHESTER, Liberty, MT

Built 1995 Load: 29.9 t ADT: 100

UPPER FORD RD

Good

Over: YAAK RIVER 152

6M N YAAK, Lincoln, MT

Built 1995 Load: 29.9 t ADT: 100

US 191

Good

Over: LITTLE COTTONWOOD CREEK

17M NE MALTA, Phillips, MT

Built 2015 Load: 29.9 t ADT: 211

OLD SHELBY RD

Good

Over: DRY FK MARIAS RIVER 013

3M NE CONRAD, Pondera, MT

Built 1970 Load: 29.9 t ADT: 60

N OLD STAGE RD

Good

Over: ROCK CREEK 078

5M NW DEER LODGE, Powell, MT

Built 2007 Load: 29.9 t ADT: 100

US 93 FH 19

Good

Over: FERN CREEK

1M S DARBY, Ravalli, MT

Built 1990 Load: 29.9 t ADT: 3,081

US 12

Good

Over: DRAINAGE

8M NW FORSYTH, Rosebud, MT

Built 2012 Load: 29.9 t ADT: 226

GREEN MOUNTAIN RD

Good

Over: SWAMP CREEK 030

5M N TROUT CREEK, Sanders, MT

Built 1986 Load: 29.9 t ADT: 100

BIG GULCH RD

Good

Over: LITTLE BITTERROOT RIV018

9 M SE HOT SPRINGS, Sanders, MT

Built 2014 Load: 29.9 t ADT: 100

INGERSOLL CREEK RO

Good

Over: W ROSEBUD CREEK

10M SW ABSAROKEE, Stillwater, MT

Built 2019 Load: 29.9 t ADT: 100

2ND ROAD SW

Good

Over: BIG COULEE

5M SW FAIRFIELD, Teton, MT

Built 2019 Load: 29.9 t ADT: 100

US 89

Good

Over: BIG MUDDY CREEK

BYNUM, Teton, MT

Built 2010 Load: 29.9 t ADT: 570

S 220

Good

Over: MUDDY CREEK

12M N CHOTEAU, Teton, MT

Built 1981 Load: 29.9 t ADT: 383

OILMONT HWY

Good

Over: WILLOW CREEK

16M E OILMONT, Toole, MT

Built 1971 Load: 29.9 t ADT: 105

MEYERS RD

Good

Over: ALKALI CREEK

4M NW MYERS, Treasure, MT

Built 1977 Load: 29.9 t ADT: 95

US 191

Good

Over: LEBO CREEK

7M S HARLOWTON, Wheatland, MT

Built 2014 Load: 29.9 t ADT: 702

US 212

Good

Over: YELLOWSTONE RIVER

1M S LAUREL, Yellowstone, MT

Built 1997 Load: 29.9 t ADT: 12,460

US 87-ROUNDUP RD

Good

Over: FIVE MILE CREEK

2M N BILLINGS, Yellowstone, MT

Built 1977 Load: 29.9 t ADT: 5,986

ROAD 325

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Beaverhead, MT

Built 2014 Load: 30.1 t ADT: 50

NEW HOPE RD

Good

Over: SNAKE CREEK 044

6M W HARLEM, Blaine, MT

Built 2004 Load: 30.1 t ADT: 100

FORT MAGINNIS RD

Good

Over: FORDS CREEK 141

12M N CHEADLE, Fergus, MT

Built 2012 Load: 30.1 t ADT: 100

SCOTT CROSSING

Good

Over: BIG SPRING CREEK 033

5M NW LEWISTOWN, Fergus, MT

Built 2009 Load: 30.1 t ADT: 100

MT 38-SKALKAHO RD

Good

Over: W FORK ROCK CREEK 006

10M E SKALKAHO PASS, Granite, MT

Built 1991 Load: 30.1 t ADT: 219

LOWER SAGE CR RD

Good

Over: SAGE CREEK 007

16M NE STANFORD, Judith Basin, MT

Built 2012 Load: 30.1 t ADT: 100

FOREST ROAD

Good

Over: NORTH FORK LOST CREEK

SOUTH LOST, Lake, MT

Built 2014 Load: 30.1 t ADT: 40

NFSR 6438

Good

Over: SPRING CREEK

N 3.9 MI. JCT. US12& 6438, Meagher, MT

Built 2010 Load: 30.1 t ADT: 40

COUNTY ROAD 280,

Good

Over: SODA BUTTE CREEK

SILVER GATE, Park, MT

Built 2022 Load: 30.1 t ADT: 100

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Ravalli, MT

Built 2013 Load: 30.1 t ADT: 40

NO DATA ENTERED

Good

Over: SWIFT CREEK

NO DATA ENTERED, Ravalli, MT

Built 2011 Load: 30.1 t ADT: 10

REVAIS CREEK ROAD

Good

Over: REVAIS CREEK 102

2.7M S MT 200, Sanders, MT

Built 2012 Load: 30.1 t ADT: 100

Showing 3,901-3,950 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.