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

GROVE CREEK RD

Good

Over: FISHTAIL CREEK 038

1M NW FISHTAIL, Stillwater, MT

Built 2004 Load: 22.7 t ADT: 100

STILLWATER RIV RD

Good

Over: STILLWATER RIVER 026

10M SW ABSAROKEE, Stillwater, MT

Built 2009 Load: 22.7 t ADT: 100

IRR BIA RTE 8

Good

Over: PRYOR CREEK

1.7 KM WEST OF PRYOR, Big Horn, MT

Built 1997 Load: 23.0 t ADT: 100

GLENGARY RD

Good

Over: COTTONWOOD CREEK 022

1M N GLENGARRY, Fergus, MT

Built 2013 Load: 23.3 t ADT: 31

FOREST ROAD

Good

Over: WOUNDED BUCK CREEK

WOUNDED BUCK CREEK, Flathead, MT

Built 2009 Load: 23.3 t ADT: 40

NFSR

Good

Over: LOGAN CREEK

TALLY LAKE CAMPGROUND, Flathead, MT

Built 2011 Load: 23.3 t ADT: 40

SHIELDS RIVER ROAD

Good

Over: SHIELDS RIVER

SHIELDS - N. CRAZIES, Park, MT

Built 1976 Load: 23.3 t ADT: 50

S 88TH ST W

Good

Over: CANYON CREEK

6M W BILLINGS, Yellowstone, MT

Built 1975 Load: 23.3 t ADT: 780

CORINNE TRAIL

Good

Over: HORSE PRAIRE CREEK 042

3M E GRANT, Beaverhead, MT

Built 1951 Load: 23.5 t ADT: 100

BLAINE ST

Good

Over: SAND COULEE CREEK 087

TRACY, Cascade, MT

Built 1950 Load: 23.5 t ADT: 100

VANZANDT RD

Good

Over: TWO LEGGIN`S CANAL 047

1M W HARDIN, Big Horn, MT

Built 1994 Load: 23.6 t ADT: 44

8 MILE RD

Good

Over: HARLEM CANAL 077

5M SE ZURICH, Blaine, MT

Built 2004 Load: 23.6 t ADT: 100

MILLEGAN RD

Good

Over: DRAINAGE-STOCKPASS

14M S ULM, Cascade, MT

Built 2000 Load: 23.6 t ADT: 292

MILLEGAN RD

Good

Over: SMITH RIVER

15M SE ULM, Cascade, MT

Built 1962 Load: 23.6 t ADT: 292

BUCK BRIDGE RD

Good

Over: TETON RIVER

5M N CARTER, Chouteau, MT

Built 1981 Load: 23.6 t ADT: 98

FRONTAGE ROAD 146

Good

Over: DRAINAGE 032

3M S WARM SPRINGS, Deer Lodge, MT

Built 1931 Load: 23.6 t ADT: 100

COUNTY ROAD 144

Good

Over: DOG CREEK

5M S WINIFRED, Fergus, MT

Built 2022 Load: 23.6 t ADT: 100

JUDITH RIVER RD

Good

Over: JUDITH RIVER 012

10M W WINIFRED, Fergus, MT

Built 2001 Load: 23.6 t ADT: 13

ROSE CROSSING

Good

Over: WHITEFISH RIVER 091

2M NW EVERGREEN, Flathead, MT

Built 1995 Load: 23.6 t ADT: 100

NORTH FORK RD

Good

Over: TEPEE CREEK 010

8M NW POLEBRIDGE, Flathead, MT

Built 2009 Load: 23.6 t ADT: 59

JUDY LN

Good

Over: RUBY RIVER 025

2M S ALDER, Madison, MT

Built 2009 Load: 23.6 t ADT: 100

DEER CREEK RD

Good

Over: CLARK FORK RIVER 11

2M E MISSOULA, Missoula, MT

Built 1975 Load: 23.6 t ADT: 1,442

MIDWAY RD E

Good

Over: S PONDERA COULEE 002

12M NE BRADY, Pondera, MT

Built 1960 Load: 23.6 t ADT: 59

S 44

Good

Over: DUPUYER CREEK

4M W VALIER, Pondera, MT

Built 2003 Load: 23.6 t ADT: 962

US 93

Good

Over: SWEATHOUSE CREEK

VICTOR, Ravalli, MT

Built 2010 Load: 23.6 t ADT: 13,545

S 203-EASTSIDE HWY

Good

Over: BITTERROOT RIVER

1M E FLORENCE, Ravalli, MT

Built 2014 Load: 23.6 t ADT: 10,617

S 220

Good

Over: JONES CREEK

13M N CHOTEAU, Teton, MT

Built 1981 Load: 23.6 t ADT: 383

ANITA DAM RD

Good

Over: FLY CREEK 138

4M SW POMPEY`S PILLAR, Yellowstone, MT

Built 2015 Load: 23.6 t ADT: 3

MAXVILLE RD

Good

Over: BOULDER CREEK 014

1M S MAXVILLE, Granite, MT

Built 2012 Load: 23.7 t ADT: 100

COPPER CREEK ROAD

Good

Over: COPPER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2005 Load: 23.7 t ADT: 169

ROUTE 471

Good

Over: SEVENTEEN MILE CREEK

NO DATA ENTERED, Lincoln, MT

Built 2012 Load: 23.7 t ADT: 40

NO DATA ENTERED

Good

Over: BURNT CREEK

NO DATA ENTERED, Lincoln, MT

Built 2012 Load: 23.7 t ADT: 40

COUNTY ROAD

Good

Over: COLD CREEK

COLD CREEK ROAD, Missoula, MT

Built 2012 Load: 23.7 t ADT: 40

INSIDE NORTH FORK

Good

Over: CAMAS CREEK

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

Built 1983 Load: 23.8 t ADT: 50

RACE HORSE GULCH R

Good

Over: CAMAS CREEK 016

E PERMA, Sanders, MT

Built 1992 Load: 23.8 t ADT: 100

COUNTY ROAD 801 NW

Good

Over: BEAVER CREEK 047

2M W HAVRE, Hill, MT

Built 1991 Load: 23.9 t ADT: 57

FOREST ROAD

Good

Over: QUINTONKON CREEK

ROAD 2806, Flathead, MT

Built 1989 Load: 24.0 t ADT: 5

RD 236

Good

Over: DEER CREEK

DEER CREEK, Mineral, MT

Built 1991 Load: 24.0 t ADT: 50

BRANCH I 15-U.S. 8

Good

Over: RR

GREAT FALLS, Cascade, MT

Built 1946 Load: 24.3 t ADT: 6,196

NFSR 274

Good

Over: MUSSELSHELL RIVER

SPRING CREEK 1, Meagher, MT

Built 1996 Load: 24.3 t ADT: 40

NO DATA ENTERED

Good

Over: TRAPPER CREEK

NO DATA ENTERED, Ravalli, MT

Built 1979 Load: 24.3 t ADT: 5

IRR BIA RTE 210

Good

Over: WEST FORK MUDDY CREEK

17.4 KM SW OF LAME DEER, Big Horn, MT

Built 1977 Load: 24.5 t ADT: 80

RAIL RD

Good

Over: TWO LEGGIN'S CANAL

1M SW HARDIN, Big Horn, MT

Built 2021 Load: 24.5 t ADT: 100

PERITSA CREEK RD

Good

Over: TWO LEGGIN`S CANAL 048

1M W HARDIN, Big Horn, MT

Built 2014 Load: 24.5 t ADT: 100

IRR - S 313

Good

Over: TWO LEGGIN CANAL

5M S HARDIN, Big Horn, MT

Built 1989 Load: 24.5 t ADT: 1,049

NEW HOPE RD

Good

Over: SNAKE CREEK 043

8M W HARLEM, Blaine, MT

Built 1987 Load: 24.5 t ADT: 100

JOHNSON RD

Good

Over: SAND COULEE CREEK 076

2M N TRACY, Cascade, MT

Built 2002 Load: 24.5 t ADT: 100

PEERLESS RD

Good

Over: W FORK POPLAR RVER 033

6M S PEERLESS, Daniels, MT

Built 1992 Load: 24.5 t ADT: 55

S 43

Good

Over: LAMARCHE CREEK

14M NW WISE RIVER, Deer Lodge, MT

Built 1941 Load: 24.5 t ADT: 454

BIRCH GROVE W

Good

Over: WHITEFISH RIVER 092

6M N KALISPELL, Flathead, MT

Built 1993 Load: 24.5 t ADT: 100

Showing 3,551-3,600 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.