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

US 12

Good

Over: GREASEWOOD CREEK

7M NW FORSYTH, Rosebud, MT

Built 2012 Load: 31.8 t ADT: 226

STONY CREEK

Good

Over: STONY LAKE CREEK

STONY CREEK, Sanders, MT

Built 2015 Load: 31.8 t ADT: 50

COUNTY ROAD 213

Good

Over: SUN RIVER SLOPE CANAL071

3M S PISHKUN RESERVOIR, Teton, MT

Built 2016 Load: 31.8 t ADT: 100

OILMONT HWY

Good

Over: MINERS COULEE

16M E OILMONT, Toole, MT

Built 1974 Load: 31.8 t ADT: 105

CUT ACROSS RD

Good

Over: CHERRY CREEK 004

6M N GLASGOW, Valley, MT

Built 2012 Load: 31.8 t ADT: 100

TIERNEY LOOP DR

Good

Over: MUSSELSHELL RIVER 008

4M E HARLOWTON, Wheatland, MT

Built 1988 Load: 31.8 t ADT: 100

US 191

Good

Over: MUSSELSHELL RIVER

1M S HARLOWTON, Wheatland, MT

Built 1969 Load: 31.8 t ADT: 800

BBP

Good

Over: YELLOWSTONE RIVER

1M NW LOCKWOOD, Yellowstone, MT

Built 2022 Load: 31.8 t ADT: 100

GRELCK LN

Good

Over: BBWA CANAL

BILLINGS HEIGHTS, Yellowstone, MT

Built 2022 Load: 31.8 t ADT: 100

1ST AVE

Good

Over: BIG DITCH

LAUREL-1ST AVE, Yellowstone, MT

Built 1968 Load: 31.8 t ADT: 2,540

COTTONWOOD CR RD

Good

Over: COTTONWOOD CREEK 027

7M SW LEWISTOWN, Fergus, MT

Built 2012 Load: 32.1 t ADT: 45

JUDITH RIVER RD

Good

Over: JUDITH RIVER 015

N HOBSON, Judith Basin, MT

Built 2014 Load: 32.1 t ADT: 69

NO DATA ENTERED

Good

Over: CLEARWATER RIVER

NO DATA ENTERED, Missoula, MT

Built 2005 Load: 32.1 t ADT: 50

MELVILLE ROAD

Good

Over: SWEET GRASS CREEK

11 M NW MELVILLE, Sweet Grass, MT

Built 2023 Load: 32.1 t ADT: 100

IRR BIA RTE 13

Good

Over: CUT BANK CREEK

6.4 KM N BLACKFEET SCHOOL, Glacier, MT

Built 1966 Load: 32.4 t ADT: 60

IRR BIA RTE 191

Good

Over: FORTY MILE CREEK

AT RED EAGLE CAMPGROUND, Glacier, MT

Built 1990 Load: 32.4 t ADT: 75

MARSH CREEK RD

Good

Over: LTL PRICKLY PEAR CR 096

5M W CANYON CREEK, Lewis and Clark, MT

Built 1976 Load: 32.4 t ADT: 100

OLD US 10

Good

Over: BIG DITCH 017

6M W PARK CITY, Stillwater, MT

Built 1955 Load: 32.4 t ADT: 1,607

S 7

Good

Over: BEAVER CREEK

1M S WIBAUX, Wibaux, MT

Built 2022 Load: 32.4 t ADT: 759

IRR BIA RTE 134

Good

Over: LITTLE PEOPLES CREEK

4 KM SE OF HAYS, Blaine, MT

Built 2000 Load: 32.5 t ADT: 100

KEIR LN

Good

Over: SPOKANE CREEK 143

4M SW CANYON FERRY, Lewis and Clark, MT

Built 2004 Load: 32.5 t ADT: 100

BRENNER LANE

Good

Over: BLOODY DICK CREEK

12 M W GRANT, Beaverhead, MT

Built 2020 Load: 32.7 t ADT: 100

CO RD 002 FH 73

Good

Over: WISE RIVER 106

7M S WISE RIVER, Beaverhead, MT

Built 1971 Load: 32.7 t ADT: 289

CO RD 002 FH 73

Good

Over: WISE RIVER 105

8M S WISE RIVER, Beaverhead, MT

Built 1971 Load: 32.7 t ADT: 289

CO RD 002 FH 73

Good

Over: WISE RIVER 021

10M S WISE RIVER, Beaverhead, MT

Built 1971 Load: 32.7 t ADT: 289

CO RD O02 FH 73

Good

Over: WISE RIVER 075

12M S WISE RIVER, Beaverhead, MT

Built 1971 Load: 32.7 t ADT: 289

COUNTY ROAD 278

Good

Over: BEAVERHEAD RIVER 124

1.2M S BARRETTS INT, Beaverhead, MT

Built 1988 Load: 32.7 t ADT: 26

IRR BIA RTE 209

Good

Over: ROSEBUD CREEK

8.1 KM WEST OF LAME DEER, Big Horn, MT

Built 1971 Load: 32.7 t ADT: 100

IRR BIA RTE 209

Good

Over: ROSEBUD CREEK

0.4 MILES WEST OF HWY 212, Big Horn, MT

Built 2019 Load: 32.7 t ADT: 100

IRR - S 313

Good

Over: TWO LEGGIN CANAL

7M SW HARDIN, Big Horn, MT

Built 1991 Load: 32.7 t ADT: 1,049

BAGAN RD

Good

Over: FORT BELKNAP CANAL 061

4M E CHINOOK, Blaine, MT

Built 2010 Load: 32.7 t ADT: 83

CHERRY RIDGE RD

Good

Over: FORT BELKNAP CANAL 066

1M W ZURICH, Blaine, MT

Built 2010 Load: 32.7 t ADT: 7

YANTIC RD

Good

Over: FORT BELKNAP CANAL 003

3M NE LOHMAN, Blaine, MT

Built 2012 Load: 32.7 t ADT: 40

S 325-ELLOAM RD

Good

Over: FORT BELKNAP CANAL

1M NE CHINOOK, Blaine, MT

Built 2012 Load: 32.7 t ADT: 213

PRYOR MOUNTAIN ROA

Good

Over: BRIDGER CREEK

3M S BRIDGER, Carbon, MT

Built 2020 Load: 32.7 t ADT: 100

OFF RAMP TO 14TH S

Good

Over: RR

GREAT FALLS, Cascade, MT

Built 1996 Load: 32.7 t ADT: 3,357

HUGHESVILLE RD

Good

Over: DRY FORK BELT CREEK 079

3M E MONARCH, Cascade, MT

Built 1962 Load: 32.7 t ADT: 100

UPPER MILLEGAN RD

Good

Over: HOUND CREEK 028

15M SE CASCADE, Cascade, MT

Built 1975 Load: 32.7 t ADT: 79

IRR - US 87

Good

Over: BIG SANDY CREEK

3M N BIG SANDY, Chouteau, MT

Built 1990 Load: 32.7 t ADT: 1,559

COUNTY ROAD 540

Good

Over: LOWER SEVEN MILE CR 008

18M SE BLOOMFIELD, Dawson, MT

Built 1969 Load: 32.7 t ADT: 26

S 200S

Good

Over: DRAINAGE

9M SE LINDSAY, Dawson, MT

Built 1966 Load: 32.7 t ADT: 866

MARSH RD

Good

Over: DRAINAGE

3M S GLENDIVE, Dawson, MT

Built 1970 Load: 32.7 t ADT: 381

MARSH RD

Good

Over: SAND CREEK

5M S GLENDIVE, Dawson, MT

Built 1966 Load: 32.7 t ADT: 93

STUMPTOWN RD

Good

Over: WARM SPRINGS CREEK 006

4M NW ANACONDA, Deer Lodge, MT

Built 2015 Load: 32.7 t ADT: 85

ANTICLINE RD

Good

Over: PENNEL CREEK 013

8M NW BAKER, Fallon, MT

Built 2009 Load: 32.7 t ADT: 30

CHRISTINA ST W

Good

Over: DOG CREEK

CHRISTINA, Fergus, MT

Built 2020 Load: 32.7 t ADT: 100

BAIN STREET

Good

Over: WOLF CREEK

DENTON-BAIN ST, Fergus, MT

Built 2022 Load: 32.7 t ADT: 100

MABEE RD

Good

Over: BLOOD CREEK 040

3M N ROY, Fergus, MT

Built 2013 Load: 32.7 t ADT: 100

S 200

Good

Over: MCDONALD CREEK

4M NE GRASS RANGE, Fergus, MT

Built 1967 Load: 32.7 t ADT: 726

INSIDE NORTH FORK

Good

Over: AKOKALA CREEK

2 Mi. N. of Jct. Hwy. 2 &, Flathead, MT

Built 1983 Load: 32.7 t ADT: 50

Showing 4,051-4,100 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.