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

INSIDE NORTH FORK

Good

Over: LOGGING CREEK

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

Built 1965 Load: 32.7 t ADT: 75

BAKER AVE

Good

Over: RR

WHITEFISH-BAKER AVE, Flathead, MT

Built 1994 Load: 32.7 t ADT: 15,012

HAMILTON RD

Good

Over: REESE CREEK

8M NE BELGRADE, Gallatin, MT

Built 2020 Load: 32.7 t ADT: 100

Hatchery Facility

Good

Over: Bridger Creek

South of Maint. Buildings, Gallatin, MT

Built 2002 Load: 32.7 t ADT: 50

I 90

Good

Over: JEFFERSON RIVER

0.6M W THREE FORKS, Gallatin, MT

Built 1968 Load: 32.7 t ADT: 8,465

SWAMP RD

Good

Over: E GALLATIN RIVER 074

6M E MANHATTAN, Gallatin, MT

Built 2008 Load: 32.7 t ADT: 100

CUSHMAN RD

Good

Over: MUSSELSHELL RIVER 015

1M NE CUSHMAN, Golden Valley, MT

Built 2012 Load: 32.7 t ADT: 24

MT 38-SKALKAHO RD

Good

Over: W FORK ROCK CREEK 012

12M E SKALKAHO PASS, Granite, MT

Built 1974 Load: 32.7 t ADT: 219

UPPER ROCK CR RD

Good

Over: ROCK CREEK 010

20M W PHILLIPSBURG, Granite, MT

Built 1976 Load: 32.7 t ADT: 592

IRR BIA RTE 6

Good

Over: BOX ELDER CREEK

4 KM NW OF ROCKY BOYS, Hill, MT

Built 1992 Load: 32.7 t ADT: 400

WARRICK RD

Good

Over: BEAVER CREEK 008

20M S HAVRE, Hill, MT

Built 2004 Load: 32.7 t ADT: 100

BEAVER CREEK RD

Good

Over: BEAVER CREEK 010

22M S HAVRE, Hill, MT

Built 2004 Load: 32.7 t ADT: 100

S 255

Good

Over: O`BRIEN COULEE

9M N RUDYARD, Hill, MT

Built 1992 Load: 32.7 t ADT: 87

S 255

Good

Over: SAGE CREEK

19M N RUDYARD, Hill, MT

Built 2004 Load: 32.7 t ADT: 87

COTTONWOOD RD

Good

Over: BOULDER RIVER 009

1M NE CARDWELL, Jefferson, MT

Built 1983 Load: 32.7 t ADT: 100

TIZER CREEK ROAD

Good

Over: PRICKLY PEAR CREEK 085

3M S JEFFERSON CITY, Jefferson, MT

Built 2005 Load: 32.7 t ADT: 100

US 87

Good

Over: STOCKPASS

3M E GEYSER, Judith Basin, MT

Built 1961 Load: 32.7 t ADT: 2,614

IRR BIA RTE 12

Good

Over: MISSION DAM CREEK

3.2KM E OF ST IGNATIUS,MT, Lake, MT

Built 2010 Load: 32.7 t ADT: 30

KAISER RD

Good

Over: PABLO CANAL 031

6M W RONAN, Lake, MT

Built 2014 Load: 32.7 t ADT: 100

MINESINGER TRAIL

Good

Over: PABLO FEEDER CANAL 003

6M SE POLSON, Lake, MT

Built 1978 Load: 32.7 t ADT: 100

COURVILLE TRAIL

Good

Over: PABLO FEEDER CANAL 006

7M SW POLSON, Lake, MT

Built 1978 Load: 32.7 t ADT: 100

US 93

Good

Over: WILDLIFE CROSSING

2M NE RONAN, Lake, MT

Built 2007 Load: 32.7 t ADT: 10,600

US 93

Good

Over: AGRICULTURAL CROSSING

2M N RONAN, Lake, MT

Built 2007 Load: 32.7 t ADT: 10,600

IRR - US 93

Good

Over: PABLO FEEDER CANAL

2M SE POLSON, Lake, MT

Built 2006 Load: 32.7 t ADT: 15,561

LAKE HELENA DR

Good

Over: HELENA VALLEY CANAL 073

2M N EAST HELENA, Lewis and Clark, MT

Built 2004 Load: 32.7 t ADT: 4,240

VALLEY DR

Good

Over: HELENA VALLEY CANAL 074

2M N EAST HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 3,171

SIERRA ROAD E

Good

Over: TEN MILE CREEK 076

5M NE HELENA, Lewis and Clark, MT

Built 2001 Load: 32.7 t ADT: 619

BEAVER CREEK RD

Good

Over: BEAVER CREEK 142

2M W NELSON, Lewis and Clark, MT

Built 2001 Load: 32.7 t ADT: 100

LITTLE WOLF CR RD

Good

Over: WOLF CREEK 146

6M NW WOLF CREEK, Lewis and Clark, MT

Built 2007 Load: 32.7 t ADT: 128

LYONS CREEK RD

Good

Over: LITTLE PRICKLY PEAR 005

5M S WOLF CREEK, Lewis and Clark, MT

Built 2001 Load: 32.7 t ADT: 100

ELK CREEK RD

Good

Over: ELK CREEK 021

9M SW AUGUSTA, Lewis and Clark, MT

Built 2002 Load: 32.7 t ADT: 34

SMITH CREEK RD

Good

Over: SMITH CREEK 023

8M SW AUGUSTA, Lewis and Clark, MT

Built 2002 Load: 32.7 t ADT: 100

RIMINI RD

Good

Over: TEN MILE CREEK 104

14M SW HELENA, Lewis and Clark, MT

Built 1981 Load: 32.7 t ADT: 230

APPLEGATE DR

Good

Over: SILVER CREEK 144

5M NW HELENA, Lewis and Clark, MT

Built 2005 Load: 32.7 t ADT: 507

E RIGGS ST

Good

Over: PRICKLY PEAR CREEK 083

EAST HELENA-E RIGGS ST, Lewis and Clark, MT

Built 1982 Load: 32.7 t ADT: 314

MCHUGH LN

Good

Over: HELENA VALLEY CANAL 086

2M N HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 1,882

COUNTRY CLUB AVE

Good

Over: TEN MILE CREEK 113

3M W HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 2,975

VALLEY FORGE RD

Good

Over: TEN MILE CREEK 126

HELENA-VALLEY FORGE RD, Lewis and Clark, MT

Built 1988 Load: 32.7 t ADT: 100

LYNDALE AVE-US 12

Good

Over: GREAT NORTHERN AREA

HELENA-LYNDALE AVE, Lewis and Clark, MT

Built 2003 Load: 32.7 t ADT: 20,843

US 287

Good

Over: FLAT CREEK

14M SE AUGUSTA, Lewis and Clark, MT

Built 2007 Load: 32.7 t ADT: 426

S 200

Good

Over: BEAVER CREEK

2M W LINCOLN, Lewis and Clark, MT

Built 1993 Load: 32.7 t ADT: 2,066

S 200

Good

Over: KEEP COOL CREEK

2M W LINCOLN, Lewis and Clark, MT

Built 1993 Load: 32.7 t ADT: 2,066

GREEN MEADOW DR

Good

Over: HELENA VALLEY CANAL

4M N HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 4,165

GRAVE CREEK

Good

Over: GRAVE CREEK

GRAVE CREEK, Lincoln, MT

Built 2013 Load: 32.7 t ADT: 40

CHASE CUTOFF RD

Good

Over: LAKE CREEK 018

5M SE TROY, Lincoln, MT

Built 1988 Load: 32.7 t ADT: 100

E 5TH ST

Good

Over: LIBBY CREEK 122

NE EDGE LIBBY, Lincoln, MT

Built 1985 Load: 32.7 t ADT: 388

MCGINNIS MEADOWS R

Good

Over: FISHER RIVER 085

7M W HAPPY`S INN, Lincoln, MT

Built 1991 Load: 32.7 t ADT: 100

DOME MOUNTAIN AVE

Good

Over: PARMENTER CREEK 162

SW EDGE LIBBY, Lincoln, MT

Built 2000 Load: 32.7 t ADT: 100

W BALSAM ST

Good

Over: FLOWER CREEK 003

SW EDGE LIBBY, Lincoln, MT

Built 1991 Load: 32.7 t ADT: 100

US 2

Good

Over: SWAMP CREEK

24M NW HAPPYS INN, Lincoln, MT

Built 2013 Load: 32.7 t ADT: 1,597

Showing 4,101-4,150 of 5,122 bridges

Related

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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.