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

ROLAND DR

Fair

Over: CANYON CREEK DITCH 056

5M SW BILLINGS, Yellowstone, MT

Built 1972 Load: 32.7 t ADT: 100

S 44TH ST W

Fair

Over: CANYON CREEK DITCH 190

7M NE LAUREL, Yellowstone, MT

Built 1965 Load: 32.7 t ADT: 100

ESTHER ROSE LN

Fair

Over: CANYON CREEK DITCH 192

7M NE LAUREL, Yellowstone, MT

Built 1985 Load: 32.7 t ADT: 100

ALKALI CREEK RD

Fair

Over: ALKALI CREEK 053

4M NW BILLINGS, Yellowstone, MT

Built 1969 Load: 32.7 t ADT: 989

SHAMROCK DR

Fair

Over: BBWA CANAL 039

BILLINGS-SHAMROCK DR, Yellowstone, MT

Built 2004 Load: 32.7 t ADT: 100

ARLINGTON AVE SW

Fair

Over: CITY COUNTY DRAIN 049

BILLINGS-ARLINGTON AVE, Yellowstone, MT

Built 1995 Load: 32.7 t ADT: 100

MCDOUGALL DR

Fair

Over: CITY COUNTY DRAIN 200

BILLINGS-MCDOUGALL DR, Yellowstone, MT

Built 1995 Load: 32.7 t ADT: 100

VALLEY DR

Fair

Over: HIGH DITCH 112

NW LAUREL-VALLEY DR, Yellowstone, MT

Built 1970 Load: 32.7 t ADT: 931

BROADWATER AVE

Fair

Over: BBWA CANAL

BILLINGS-BROADWATER AVE, Yellowstone, MT

Built 1984 Load: 32.7 t ADT: 8,657

HILLTOP RD

Fair

Over: BBWA CANAL

BILLINGS-HILLTOP RD, Yellowstone, MT

Built 1960 Load: 32.7 t ADT: 8,225

I 94

Fair

Over: GRIFFITH CREEK

7M E GLENDIVE, Dawson, MT

Built 1951 Load: 33.0 t ADT: 2,082

NO DATA ENTERED

Fair

Over: GOLD CREEK

JACKSON PARK ROAD, Granite, MT

Built 1975 Load: 33.0 t ADT: 40

STATE HIGHWAY 24

Fair

Over: FT. PECK SPILLWAY

4 Miles East of Fort Peck, McCone, MT

Built 1937 Load: 33.0 t ADT: 203

GATEWAY S RD

Fair

Over: GALLATIN RIVER 019

GALLATIN GATEWAY, Gallatin, MT

Built 2001 Load: 33.2 t ADT: 100

IRR BIA RTE 006

Fair

Over: BOX ELDER CREEK

2 KM SE OF BOX ELDER, Hill, MT

Built 2000 Load: 33.3 t ADT: 1,000

CANYON CREEK RD

Fair

Over: CANYON CREEK

1ST BRIDGE ON CANYON CR, Flathead, MT

Built 1976 Load: 33.4 t ADT: 5

746 VINAL LAKE RD.

Fair

Over: E FK YAAK

0.1 MI FROM JCT WITH 92, Lincoln, MT

Built 1968 Load: 33.4 t ADT: 50

473 KEELER/RATTLE

Fair

Over: N F KEELER CR

JUST PAST JCT WITH 404, Lincoln, MT

Built 1976 Load: 33.4 t ADT: 25

DAVID THOMPSON BRG

Fair

Over: KOOTENAI RIVER D/S DAM

LIBBY DAM, MONTANA, Lincoln, MT

Built 1967 Load: 33.4 t ADT: 100

LEDFORD CREEK RD

Fair

Over: RUBY RIVER 058

17M S ALDER, Madison, MT

Built 1960 Load: 33.4 t ADT: 100

NO DATA ENTERED

Fair

Over: EAST FK BULL RIVER

LOST GIRL NO 2, Sanders, MT

Built 1963 Load: 33.4 t ADT: 20

RD 7569

Fair

Over: FISHTRAP CR

RADIO MANTRAP, Sanders, MT

Built 1963 Load: 33.4 t ADT: 50

S 278

Fair

Over: WARM SPRING CREEK

JACKSON, Beaverhead, MT

Built 1970 Load: 33.5 t ADT: 389

3 MILE RD

Fair

Over: SALT CREEK 055

6M W SUFFOLK, Fergus, MT

Built 1962 Load: 33.5 t ADT: 100

DELREY RD

Fair

Over: LAZY CREEK 124

8M NW WHITEFISH, Flathead, MT

Built 1995 Load: 33.5 t ADT: 100

GREEN ACRES RD

Fair

Over: DODSON NORTH CANAL 005

NW MALTA, Phillips, MT

Built 1930 Load: 33.5 t ADT: 100

BOULDER RD

Fair

Over: SPECULATOR CREEK 011

20M S MCLEOD, Sweet Grass, MT

Built 1965 Load: 33.5 t ADT: 156

BELLVIEW RD

Fair

Over: TETON RIVER 061

2M SW CHOTEAU, Teton, MT

Built 1970 Load: 33.5 t ADT: 100

PISHKUN RD

Fair

Over: WILLOW CREEK 070

9M SW CHOTEAU, Teton, MT

Built 1970 Load: 33.5 t ADT: 100

20TH RD NW

Fair

Over: SPRING COULEE 017

6M NE FARMINGTON, Teton, MT

Built 1975 Load: 33.5 t ADT: 87

I 90

Fair

Over: SEP COUNTY ROAD

21.1M E BILLINGS, Big Horn, MT

Built 1972 Load: 33.6 t ADT: 4,152

I 90

Fair

Over: SEP COUNTY ROAD

21.1M E BILLINGS, Big Horn, MT

Built 1972 Load: 33.6 t ADT: 4,152

OLD HWY 87

Fair

Over: FLY CREEK 090

15M W HARDIN, Big Horn, MT

Built 2002 Load: 33.6 t ADT: 561

S 72

Fair

Over: CLARKS FORK YELLOWSTONE

1M N BELFRY, Carbon, MT

Built 2013 Load: 33.6 t ADT: 1,722

WILLOW CREEK RD

Fair

Over: LITTLE BELT CREEK 099

13M E BELT, Cascade, MT

Built 1950 Load: 33.6 t ADT: 157

S 200

Fair

Over: SUN RIVER

SUN RIVER, Cascade, MT

Built 1996 Load: 33.6 t ADT: 2,418

S 511

Fair

Over: S FORK WHITETAIL CREEK

3M N FLAXVILLE, Daniels, MT

Built 1999 Load: 33.6 t ADT: 131

I 94

Fair

Over: GRIFFITH CREEK

7M E GLENDIVE, Dawson, MT

Built 1980 Load: 33.6 t ADT: 2,082

STAR MEADOW RD

Fair

Over: LOGAN CREEK 177

17M SW OLNEY, Flathead, MT

Built 1981 Load: 33.6 t ADT: 100

I 90

Fair

Over: RR

BOZEMAN, Gallatin, MT

Built 1971 Load: 33.6 t ADT: 10,307

US 191 FH 42

Fair

Over: GRAYLING CREEK

10M N WEST YELLOWSTONE, Gallatin, MT

Built 2012 Load: 33.6 t ADT: 2,481

IRR - US 89

Fair

Over: AGENCY CREEK

15M SE BROWNING, Glacier, MT

Built 1966 Load: 33.6 t ADT: 1,184

RIMINI RD

Fair

Over: TEN MILE CREEK 106

1M S RIMINI, Lewis and Clark, MT

Built 1962 Load: 33.6 t ADT: 106

US 2

Fair

Over: YAAK RIVER

8M NW TROY, Lincoln, MT

Built 1934 Load: 33.6 t ADT: 2,286

US 2

Fair

Over: CALLAHAN CREEK

TROY, Lincoln, MT

Built 1989 Load: 33.6 t ADT: 4,850

US 93 FH 12

Fair

Over: GRAVE CREEK

2M NW FORTINE, Lincoln, MT

Built 1991 Load: 33.6 t ADT: 3,036

S 37 FH 57

Fair

Over: KOOTENAI RIVER

3M S LIBBY DAM, Lincoln, MT

Built 1969 Load: 33.6 t ADT: 649

JACK CR BENCH RD

Fair

Over: JACK CREEK 031

7M E ENNIS, Madison, MT

Built 1952 Load: 33.6 t ADT: 175

I 90

Fair

Over: CLARK FORK RIVER

3.7M W SUPERIOR, Mineral, MT

Built 1982 Load: 33.6 t ADT: 3,615

I 90

Fair

Over: CLARK FORK RIVER

2.5M W SUPERIOR, Mineral, MT

Built 1960 Load: 33.6 t ADT: 3,615

Showing 2,701-2,750 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.