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

JOHNSON BRIDGE RD

Good

Over: STILLWATER RIVER

2M NW ABSAROKEE, Stillwater, MT

Built 2021 Load: 17.2 t ADT: 66

PORTAL CREEK ROAD

Good

Over: PORTAL CREEK

NO DATA ENTERED, Gallatin, MT

Built 2005 Load: 17.5 t ADT: 50

0402: CAP WALLACE

Good

Over: ELK CREEK

2 mi S of Sunset Hill Rd, Missoula, MT

Built 1991 Load: 17.5 t ADT: 25

FDR 2475

Good

Over: WISE RIVER

ADSON CR., Beaverhead, MT

Built 1986 Load: 17.8 t ADT: 50

RED CLIFF CAMP RD

Good

Over: GALLATIN RIVER

RED CLIFF-GALLATIN CANYN, Gallatin, MT

Built 1968 Load: 17.8 t ADT: 99

NO DATA ENTERED

Good

Over: RANDOLF CREEK

NO DATA ENTERED, Mineral, MT

Built 1991 Load: 17.8 t ADT: 40

JARVI RD

Good

Over: LITTLE BELT CREEK 037

13M E BELT, Cascade, MT

Built 1971 Load: 18.1 t ADT: 100

SUN R CASCADE RD

Good

Over: LITTLE MUDDY CREEK 040

6M N CASCADE, Cascade, MT

Built 2004 Load: 18.1 t ADT: 67

CENTRAL AVE W

Good

Over: SUN RIVER 056

GREAT FALLS, Cascade, MT

Built 1987 Load: 18.1 t ADT: 1,578

CENTRAL AVE

Good

Over: MISSOURI RIVER-PED TRAIL

GREAT FALLS-CENTRAL AVE W, Cascade, MT

Built 1980 Load: 18.1 t ADT: 25,875

US 87

Good

Over: MARIAS RIVER

LOMA, Chouteau, MT

Built 1988 Load: 18.1 t ADT: 1,368

FRONTAGE ROAD 005

Good

Over: MOON CREEK 093

9M SW MILES CITY, Custer, MT

Built 2013 Load: 18.1 t ADT: 100

COUNTY ROAD

Good

Over: BEAVER CREEK 143

1M W GLENGARRY, Fergus, MT

Built 2012 Load: 18.1 t ADT: 100

IRR - US 89

Good

Over: N FORK CUT BANK CREEK

5M N KIOWA, Glacier, MT

Built 1987 Load: 18.1 t ADT: 830

RD 867

Good

Over: BIG CHERRY CR

CHERRY CR, Lincoln, MT

Built 1982 Load: 18.1 t ADT: 40

RD 7611

Good

Over: CLEAR CR

DIRTY-CLEAR RD, Sanders, MT

Built 1991 Load: 18.1 t ADT: 50

NO DATA ENTERED

Good

Over: PROSPECT CREEK

COX GULCH, Sanders, MT

Built 1974 Load: 18.1 t ADT: 50

OLD US 10

Good

Over: UPPER DEER CREEK 005

4M NW GREYCLIFF, Sweet Grass, MT

Built 1975 Load: 18.1 t ADT: 553

N CANAL DR

Good

Over: HUNTLEY MAIN CANAL 104

S HUNTLEY, Yellowstone, MT

Built 1975 Load: 18.1 t ADT: 100

MARY ST

Good

Over: FIVE MILE CREEK 118

NE BILLINGS-MARY ST, Yellowstone, MT

Built 2007 Load: 18.1 t ADT: 572

NO DATA ENTERED

Good

Over: BLOODY D--- CR

BLOODY D--- CR, Beaverhead, MT

Built 1998 Load: 18.5 t ADT: 40

NO DATA ENTERED

Good

Over: SHEEPHEAD CR

NO DATA ENTERED, Ravalli, MT

Built 2011 Load: 18.5 t ADT: 100

GALBREATH RD

Good

Over: ST MARY CANAL 045

18M NE BABB, Glacier, MT

Built 1991 Load: 19.1 t ADT: 100

BLACK PINE ROAD

Good

Over: FLINT CREEK 007

2M NW PHILLIPSBURG, Granite, MT

Built 1991 Load: 19.1 t ADT: 100

S FRESNO RD

Good

Over: SAGE CREEK 053

3M NE BOX ELDER, Hill, MT

Built 2009 Load: 19.1 t ADT: 46

NFSR #251

Good

Over: PLACER CREEK

19 MI. SW OF STANFORD, Judith Basin, MT

Built 1954 Load: 19.1 t ADT: 50

SIX MILE ROAD

Good

Over: SIX MILE CREEK

NO DATA ENTERED, Park, MT

Built 2014 Load: 19.1 t ADT: 50

S 544

Good

Over: LITTLE POWDER RIVER

BIDDLE, Powder River, MT

Built 1974 Load: 19.1 t ADT: 138

COUNTY ROAD 653

Good

Over: E FORK BITTERROOT R 107

4M NE SULA, Ravalli, MT

Built 1991 Load: 19.1 t ADT: 303

MATOVICH RD

Good

Over: MCDONALD CREEK

5M NE GRASS RANGE, Fergus, MT

Built 2023 Load: 19.4 t ADT: 100

NO DATA ENTERED

Good

Over: ARCHIBALD CR

NO DATA ENTERED, Lake, MT

Built 2004 Load: 19.8 t ADT: 50

SKYLINE DR

Good

Over: PABLO FEEDER CANAL 040

2M SE POLSON, Lake, MT

Built 2011 Load: 19.9 t ADT: 100

S 43 FH 20

Good

Over: TRAIL CREEK

19M W WISDOM, Beaverhead, MT

Built 1961 Load: 20.0 t ADT: 431

IRR - S 66

Good

Over: LITTLE PEOPLES CREEK

2M NW HAYS, Blaine, MT

Built 2015 Load: 20.0 t ADT: 971

IRR - S 66

Good

Over: LITTLE PEOPLES CREEK

4M NW HAYS, Blaine, MT

Built 2015 Load: 20.0 t ADT: 971

IRR - S 66

Good

Over: LITTLE PEOPLES CREEK

8M NW HAYS, Blaine, MT

Built 2015 Load: 20.0 t ADT: 971

S 234

Good

Over: SCOTTS COULEE

1M S HAVRE, Hill, MT

Built 1976 Load: 20.0 t ADT: 1,085

LT PRICKLY PEAR RD

Good

Over: LTL PRICKLY PEAR CR 097

6M W CANYON CREEK, Lewis and Clark, MT

Built 1952 Load: 20.0 t ADT: 121

S 83 FH 15

Good

Over: MORRELL CREEK

SEELEY LAKE, Missoula, MT

Built 1950 Load: 20.0 t ADT: 2,580

US 12

Good

Over: BIG PORCUPINE CREEK

13M NW FORSYTH, Rosebud, MT

Built 2004 Load: 20.0 t ADT: 226

DEMERSVILLE RD

Good

Over: ASHLEY CREEK 004

1M E FOUR CORNERS, Flathead, MT

Built 1999 Load: 20.1 t ADT: 100

NFSR 314

Good

Over: TROUT CREEK

SPOTTED DOG-TROUT, Powell, MT

Built 2004 Load: 20.1 t ADT: 50

E REEDER STREET

Good

Over: BLACKTAIL DEER CREEK 131

DILLON-E REEDER ST, Beaverhead, MT

Built 2010 Load: 20.4 t ADT: 1,925

FDR 267

Good

Over: CHAMBERLAIN CREEK

0.9 MI E. US89/FDR267 JCT, Cascade, MT

Built 2002 Load: 20.4 t ADT: 50

8TH LN NE

Good

Over: TETON RIVER 049

2M SW COLLINS, Teton, MT

Built 1998 Load: 20.4 t ADT: 100

2-LANE ROAD

Good

Over: ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 1970 Load: 20.7 t ADT: 50

050438: SAUERKRAUT

Good

Over: Sauerkraut Creek

4.5 mi. W of Lincoln, MT, Lewis and Clark, MT

Built 2010 Load: 20.7 t ADT: 5

NFSR 233

Good

Over: WILLOW CREEK

LITTLE WILLOW CREEK, Lewis and Clark, MT

Built 2004 Load: 20.7 t ADT: 26

RD 231

Good

Over: LIBBY CR

BOLYARDS, Lincoln, MT

Built 1998 Load: 20.7 t ADT: 50

TUTTLE LN

Good

Over: E ROSEBUD CREEK 003

3.7M NE ROSCOE, Carbon, MT

Built 2009 Load: 20.9 t ADT: 100

Showing 3,451-3,500 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.