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

Fair

Over: MCGINNIS CREEK

NO DATA ENTERED, Sanders, MT

Built 1960 Load: 30.5 t ADT: 40

SIGNAL BUTTE RD

Fair

Over: T AND Y CANAL 074

3M SE MILES CITY, Custer, MT

Built 2001 Load: 30.6 t ADT: 100

LITTLE BEAR RD

Fair

Over: W GALLATIN CANAL 119

2M S GALLATIN GATEWAY, Gallatin, MT

Built 2005 Load: 30.7 t ADT: 100

LIMA DAM ROAD

Fair

Over: RED ROCK RIVER

5M E LIMA, Beaverhead, MT

Built 2019 Load: 30.8 t ADT: 116

IRRC0UNTY ROAD 223

Fair

Over: SOAP CREEK 020

9M SW ST XAVIER, Big Horn, MT

Built 1980 Load: 30.8 t ADT: 100

OLD HWY 87

Fair

Over: RR 025

12M W HARDIN, Big Horn, MT

Built 2006 Load: 30.8 t ADT: 561

CLEVELAND RD

Fair

Over: BEAN CREEK

11M S CHINOOK, Blaine, MT

Built 1957 Load: 30.8 t ADT: 159

DUTCH LN

Fair

Over: SILVERTIP CREEK 060

1M NE BELFRY, Carbon, MT

Built 2006 Load: 30.8 t ADT: 100

A-6 LANE

Fair

Over: BELT CREEK

4.8 KM SE OF MONARCH, Cascade, MT

Built 1960 Load: 30.8 t ADT: 20

CORA CREEK RD

Fair

Over: CORA CREEK 075

7M SE BELT, Cascade, MT

Built 1950 Load: 30.8 t ADT: 100

LANDER CROSSING

Fair

Over: HIGHWOOD CREEK 060

7M NW HIGHWOOD, Chouteau, MT

Built 1986 Load: 30.8 t ADT: 100

PN BRIDGE RD

Fair

Over: MISSOURI RIVER

25M NW WINIFRED, Chouteau, MT

Built 1982 Load: 30.8 t ADT: 39

FRNTAGE ROAD 81020

Fair

Over: MACKS CREEK 038

23M NE MILES CITY, Custer, MT

Built 1929 Load: 30.8 t ADT: 504

S 248

Fair

Over: SPRING COULEE

2M NW RICHLAND, Daniels, MT

Built 1950 Load: 30.8 t ADT: 153

ROAD 250

Fair

Over: IRRIGATION CANAL 047

12M S GLENDIVE, Dawson, MT

Built 1979 Load: 30.8 t ADT: 100

LOWER RD

Fair

Over: WOLF CREEK 086

5M SW DENTON, Fergus, MT

Built 1962 Load: 30.8 t ADT: 73

US 87

Fair

Over: COTTONWOOD CREEK

5M SW LEWISTOWN, Fergus, MT

Built 2009 Load: 30.8 t ADT: 2,443

S 81

Fair

Over: WARM SPRING CREEK

7M SW HILGER, Fergus, MT

Built 1949 Load: 30.8 t ADT: 375

S 81

Fair

Over: WARM SPRING CREEK

5M SW HILGER, Fergus, MT

Built 1969 Load: 30.8 t ADT: 375

CAMAS ROAD

Fair

Over: MCDONALD CREEK

2 miles north of U.S. Rou, Flathead, MT

Built 1962 Load: 30.8 t ADT: 560

POLEBRIDGE ROAD

Fair

Over: NORTH FORK FLATHEAD RIVE

2 miles north of U.S. Rou, Flathead, MT

Built 1991 Load: 30.8 t ADT: 100

S 35

Fair

Over: SPRING CREEK

1M E KALISPELL, Flathead, MT

Built 1966 Load: 30.8 t ADT: 12,559

I 90

Fair

Over: MADISON RIVER-RR

0.6M E THREE FORKS, Gallatin, MT

Built 1964 Load: 30.8 t ADT: 9,524

PENWELL BRIDGE RD

Fair

Over: E GALLATIN RIVER 059

3M NE BELGRADE, Gallatin, MT

Built 1985 Load: 30.8 t ADT: 560

SPAIN BRIDGE RD

Fair

Over: E GALLATIN RIVER 058

5M E BELGRADE, Gallatin, MT

Built 1975 Load: 30.8 t ADT: 100

CANAL RD

Fair

Over: GODFREY CREEK 083

2M S CHURCHILL, Gallatin, MT

Built 1988 Load: 30.8 t ADT: 100

SPRINGHILL RD

Fair

Over: EAST GALLATIN RIVER

3M NW BOZEMAN, Gallatin, MT

Built 1990 Load: 30.8 t ADT: 9,053

SPRINGHILL RD

Fair

Over: CHURN CREEK

4M NW BOZEMAN, Gallatin, MT

Built 1990 Load: 30.8 t ADT: 9,053

E KAGY BLVD

Fair

Over: BOZEMAN CREEK

BOZEMAN-E KAGY BLVD, Gallatin, MT

Built 1984 Load: 30.8 t ADT: 9,638

NO DATA ENTERED

Fair

Over: SPILLWAY

SPILLWAY, Granite, MT

Built 1958 Load: 30.8 t ADT: 50

IRR - S 448

Fair

Over: BIG SANDY CREEK

2M W BOX ELDER, Hill, MT

Built 1961 Load: 30.8 t ADT: 95

I 15

Fair

Over: BOULDER RIVER

2.5M W BOULDER, Jefferson, MT

Built 1980 Load: 30.8 t ADT: 1,904

MT HWY 2

Fair

Over: COLBERT CREEK 063

7M W WHITEHALL, Jefferson, MT

Built 1931 Load: 30.8 t ADT: 579

IRR - S 200

Fair

Over: JOCKO RIVER-RR

RAVALLI, Lake, MT

Built 1998 Load: 30.8 t ADT: 1,902

FIELDS GLCH ROAD

Fair

Over: POORMAN CREEK

FIELDS GULCH, Lewis and Clark, MT

Built 1979 Load: 30.8 t ADT: 20

LINCOLN RD W

Fair

Over: CANYON CREEK

5M NW CANYON CREEK, Lewis and Clark, MT

Built 1949 Load: 30.8 t ADT: 394

US 2

Fair

Over: LIBBY CREEK

11M S LIBBY, Lincoln, MT

Built 1988 Load: 30.8 t ADT: 1,597

S 24

Fair

Over: NELSON CREEK

15M N FLOWING WELLS, McCone, MT

Built 1963 Load: 30.8 t ADT: 134

SCHWARTZ CREEK RD

Fair

Over: CLARK FORK 093

1M S CLINTON, Missoula, MT

Built 1956 Load: 30.8 t ADT: 100

SCOTT ST

Fair

Over: RR

MISSOULA-SCOTT ST, Missoula, MT

Built 1979 Load: 30.8 t ADT: 6,596

NF 132-BIG CREEK R

Fair

Over: BIG CREEK 063

11M SW EMIGRANT, Park, MT

Built 1997 Load: 30.8 t ADT: 100

US 2

Fair

Over: DODSON NORTH CANAL

DODSON, Phillips, MT

Built 1976 Load: 30.8 t ADT: 1,189

IRR - US 191

Fair

Over: FORK OF BEAVER CREEK

38M SW MALTA, Phillips, MT

Built 1948 Load: 30.8 t ADT: 375

S 208

Fair

Over: WHITEWATER CREEK

WHITEWATER, Phillips, MT

Built 2001 Load: 30.8 t ADT: 119

BLAZEN RD

Fair

Over: PONDERA COULEE 079

CONRAD-BLAZEN RD, Pondera, MT

Built 2004 Load: 30.8 t ADT: 100

CONRAD DUPUYER RD

Fair

Over: DRAINAGE

8M E DUPUYER, Pondera, MT

Built 1953 Load: 30.8 t ADT: 53

I 90

Fair

Over: CLARK FORK RIVER

1.2M S DEER LODGE, Powell, MT

Built 1961 Load: 30.8 t ADT: 4,928

OVANDO HELMVILLE R

Fair

Over: N FK BLACKFOOT RIVER 005

13M N HELMVILLE, Powell, MT

Built 2000 Load: 30.8 t ADT: 50

US 12

Fair

Over: LITTLE BLACKFOOT RIVER

AVON, Powell, MT

Built 1982 Load: 30.8 t ADT: 2,794

US 12

Fair

Over: RR

GARRISON, Powell, MT

Built 1949 Load: 30.8 t ADT: 1,377

Showing 2,251-2,300 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.