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

FDR 6414

Fair

Over: SHEEP CREEK

0.1 MI N US89/FDR6413 JCT, Meagher, MT

Built 1958 Load: 19.8 t ADT: 50

RD 56

Fair

Over: W F THOMPSON RIV

THOMPSON RIVER, Sanders, MT

Built 1935 Load: 19.8 t ADT: 50

1-LANE ROAD

Fair

Over: WEST ROSEBUD CREEK

EMERALD LAKE INLET, Stillwater, MT

Built 1965 Load: 19.8 t ADT: 50

BALA ST

Fair

Over: LITTLE BIGHORN RIVER 069

CROW AGENCY, Big Horn, MT

Built 1958 Load: 20.0 t ADT: 100

IRR - S 313

Fair

Over: INDIAN SERVICE CANAL

10M SW ST XAVIER, Big Horn, MT

Built 1962 Load: 20.0 t ADT: 500

CLEVELAND RD

Fair

Over: MILK RIVER

CHINOOK, Blaine, MT

Built 1964 Load: 20.0 t ADT: 849

MILLEGAN RD

Fair

Over: SMITH RIVER

5M SE ULM, Cascade, MT

Built 1950 Load: 20.0 t ADT: 292

ROAD 261

Fair

Over: IRRIGATION CANAL 042

15M SW GLENDIVE, Dawson, MT

Built 1920 Load: 20.0 t ADT: 21

S 569

Fair

Over: FRENCH CREEK 043

21M SW ANACONDA, Deer Lodge, MT

Built 1950 Load: 20.0 t ADT: 288

16 MILE CREEK RD

Fair

Over: MID FORK 16-MILE CR 072

4M E MAUDLOW, Gallatin, MT

Built 1996 Load: 20.0 t ADT: 100

PINE BUTTE RD

Fair

Over: HIGHLINE CANAL 114

6M S BELGRADE, Gallatin, MT

Built 1992 Load: 20.0 t ADT: 100

US 191

Fair

Over: GALLATIN RIVER

23M N WEST YELLOWSTONE, Gallatin, MT

Built 1955 Load: 20.0 t ADT: 2,481

I 90

Fair

Over: RR

5.6M W WHITEHALL, Jefferson, MT

Built 1966 Load: 20.0 t ADT: 4,591

FISH HATCHERY RD

Fair

Over: POST CREEK 075

4M N ST IGNATIUS, Lake, MT

Built 1920 Load: 20.0 t ADT: 100

IRR - US 93

Fair

Over: FLATHEAD RIVER

POLSON, Lake, MT

Built 1966 Load: 20.0 t ADT: 8,324

US 287

Fair

Over: DEARBORN RIVER

14M NW WOLF CREEK, Lewis and Clark, MT

Built 1963 Load: 20.0 t ADT: 457

N MONTANA AVE

Fair

Over: HELENA VALLEY CANAL

1M N HELENA, Lewis and Clark, MT

Built 1958 Load: 20.0 t ADT: 11,526

US 2

Fair

Over: FISHER RIVER

14M W HAPPY`S INN, Lincoln, MT

Built 1987 Load: 20.0 t ADT: 1,480

BURMA RD

Fair

Over: BIG HOLE RIVER 015

14M NW SHERIDAN, Madison, MT

Built 1987 Load: 20.0 t ADT: 100

I 90

Fair

Over: ST. REGIS RIVER

4.3M W ST. REGIS, Mineral, MT

Built 1981 Load: 20.0 t ADT: 3,180

I 90

Fair

Over: RR

0.6M W BONNER, Missoula, MT

Built 1963 Load: 20.0 t ADT: 6,035

STYLER DR

Fair

Over: GLACIER CREEK 059

1M SW CONDON, Missoula, MT

Built 1970 Load: 20.0 t ADT: 100

S ORANGE ST

Fair

Over: CLARK FORK RIVER

MISSOULA-S ORANGE ST, Missoula, MT

Built 2003 Load: 20.0 t ADT: 22,614

I 90

Fair

Over: MISSION CREEK

9.9M E LIVINGSTON, Park, MT

Built 1987 Load: 20.0 t ADT: 5,692

US 89

Fair

Over: YELLOWSTONE RIVER

6M NE LIVINGSTON, Park, MT

Built 1955 Load: 20.0 t ADT: 2,146

ROAD 201

Fair

Over: NICHOLS COULEE

SECT 10 T21N R27E, Phillips, MT

Built 1963 Load: 20.0 t ADT: 15

SWANSON RD

Fair

Over: DRAINAGE 062

3M N VALIER, Pondera, MT

Built 1986 Load: 20.0 t ADT: 100

S 366-LEDGER RD

Fair

Over: DRY FORK MARIAS RIVER

LEDGER, Pondera, MT

Built 1952 Load: 20.0 t ADT: 128

YELLOWSTONE TRAIL

Fair

Over: RACETRACK CREEK 036

2M W RACETRACK, Powell, MT

Built 2006 Load: 20.0 t ADT: 100

NO DATA ENTERED

Fair

Over: HUGHES CR

NO DATA ENTERED, Ravalli, MT

Built 1964 Load: 20.0 t ADT: 10

E FORK RD

Fair

Over: E FORK BITTERROOT R 009

14M NE SULA, Ravalli, MT

Built 1947 Load: 20.0 t ADT: 303

S 201

Fair

Over: N FORK FIRST HAY CREEK

10M W FAIRVIEW, Richland, MT

Built 1937 Load: 20.0 t ADT: 851

S 201

Fair

Over: SECOND HAY CREEK

5M W FAIRVIEW, Richland, MT

Built 1937 Load: 20.0 t ADT: 722

S 261

Fair

Over: O`BRIEN CREEK

9M S SIDNEY, Richland, MT

Built 1977 Load: 20.0 t ADT: 86

US 12

Fair

Over: DRY WASH

3M W INGOMAR, Rosebud, MT

Built 1947 Load: 20.0 t ADT: 144

S 446

Fair

Over: RR

1M W ROSEBUD, Rosebud, MT

Built 1970 Load: 20.0 t ADT: 255

IRR - S 28

Fair

Over: HOT SPRINGS CREEK

2M NE CAMAS, Sanders, MT

Built 1959 Load: 20.0 t ADT: 2,140

E BOULDER RD

Fair

Over: E BOULDER RIVER 033

5M S MCLEOD, Sweet Grass, MT

Built 1969 Load: 20.0 t ADT: 100

CACHE CREEK RD

Fair

Over: MIDDLE FORK CASH CR 049

12M N HINSDALE, Valley, MT

Built 1960 Load: 20.0 t ADT: 100

I 94

Fair

Over: BIGHORN RIVER

0.6M W BIGHORN, Yellowstone, MT

Built 1963 Load: 20.0 t ADT: 2,580

NPS SERVICE ROAD

Fair

Over: UPPER DIVIDE CREEK

Just south of Going-to-th, Glacier, MT

Built 1970 Load: 20.1 t ADT: 50

NO DATA ENTERED

Fair

Over: FLINT CREEK

5 MI. N. OF P-BURG ON HWY, Granite, MT

Built 2001 Load: 20.1 t ADT: 50

GRIZZLE CAMP RD

Fair

Over: RANCH CR

GRIZZLY CAMP, Granite, MT

Built 1958 Load: 20.1 t ADT: 50

UPPER ROCK CR RD

Fair

Over: STONY CREEK 011

19M W PHILLIPSBURG, Granite, MT

Built 1999 Load: 20.1 t ADT: 592

FRONTAGE ROAD 153

Fair

Over: CLARK FORK RIVER 034

14M W DRUMMOND, Granite, MT

Built 1970 Load: 20.1 t ADT: 267

NFSR #487

Fair

Over: S FK JUDITH RIVER

16 MI SW OF UTICA, Judith Basin, MT

Built 1958 Load: 20.1 t ADT: 65

NFSR #487

Fair

Over: S FK JUDITH RIVER

19 MI. SW OF UTICA, Judith Basin, MT

Built 1958 Load: 20.1 t ADT: 65

RUBY-CENTENNTIAL

Fair

Over: EAST FK RUBY RIVER

EAST FK RUBY RIVER, Madison, MT

Built 1954 Load: 20.1 t ADT: 50

RD 153

Fair

Over: CLEAR CR

CLEAR CR, Sanders, MT

Built 1968 Load: 20.1 t ADT: 50

CASTLE BUTTE RD

Fair

Over: HIBBARD CREEK 187

12M N POMPEY`S PILLAR, Yellowstone, MT

Built 1997 Load: 20.1 t ADT: 100

Showing 1,101-1,150 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.