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

S 556-THOMPSON R R

Good

Over: THOMPSON RIVER

30M SW MARION, Sanders, MT

Built 1988 Load: 32.7 t ADT: 55

SANDHILLS RD

Good

Over: SAND CREEK 057

15M E MEDICINE LAKE, Sheridan, MT

Built 1988 Load: 32.7 t ADT: 100

LAKE CREEK RD

Good

Over: LAKE CREEK 078

20M E PLENTYWOOD, Sheridan, MT

Built 1983 Load: 32.7 t ADT: 100

LOST CREEK RD

Good

Over: LOST CREEK 050

2M S HOMESTEAD, Sheridan, MT

Built 1991 Load: 32.7 t ADT: 100

S 5

Good

Over: REDSTONE CREEK

2M SE REDSTONE, Sheridan, MT

Built 2011 Load: 32.7 t ADT: 508

S 5

Good

Over: MCCOY CREEK

3M W PLENTYWOOD, Sheridan, MT

Built 2001 Load: 32.7 t ADT: 585

I 90

Good

Over: BERRY CREEK

7.4M E REED POINT, Stillwater, MT

Built 1963 Load: 32.7 t ADT: 5,353

VALLEY CREEK RD

Good

Over: VALLEY CREEK 009

6M NW PARK CITY, Stillwater, MT

Built 2008 Load: 32.7 t ADT: 100

COUNTRYMAN CR RD

Good

Over: COUNTRYMAN CREEK 050

6M SW COLUMBUS, Stillwater, MT

Built 1996 Load: 32.7 t ADT: 100

W FORK RD

Good

Over: LIMESTONE CREEK 051

3M NW NYE, Stillwater, MT

Built 2004 Load: 32.7 t ADT: 100

W ROSEBUD RD

Good

Over: W ROSEBUD CREEK 033

12M SW ABSAROKEE, Stillwater, MT

Built 2004 Load: 32.7 t ADT: 100

NYE RD-S 419

Good

Over: FISHTAIL CREEK

3M SW FISHTAIL, Stillwater, MT

Built 1994 Load: 32.7 t ADT: 1,055

OLD BOULDER ROAD

Good

Over: BOULDER RIVER 029

EAST BIG TIMBER, Sweet Grass, MT

Built 2020 Load: 32.7 t ADT: 100

I 90

Good

Over: LOWER DEER CREEK

0.6M W GREYCLIFF, Sweet Grass, MT

Built 1980 Load: 32.7 t ADT: 6,415

E BOULDER RD

Good

Over: BOULDER RIVER 030

2M S MCLEOD, Sweet Grass, MT

Built 2002 Load: 32.7 t ADT: 100

3RD RD NE

Good

Over: NO NAME DITCH 012

10M NE FAIRFIELD, Teton, MT

Built 1995 Load: 32.7 t ADT: 100

DEEP CREEK RD

Good

Over: DEEP CREEK 065

27M SW CHOTEAU, Teton, MT

Built 1976 Load: 32.7 t ADT: 100

IRR BIA RTE 30

Good

Over: MAIN CANAL

.8 KM E OF PUMP STATION, Valley, MT

Built 2010 Load: 32.7 t ADT: 50

FUHRMAN RD

Good

Over: MIDDLE FK PORCUPINE 020

17M S OPHEIM, Valley, MT

Built 1981 Load: 32.7 t ADT: 100

RED BRIDGE RD

Good

Over: MUSSELSHELL RIVER 016

2M SE HARLOWTON, Wheatland, MT

Built 1977 Load: 32.7 t ADT: 100

RED BRIDGE RD

Good

Over: AMERICAN FORK CREEK 015

6M SE HARLOWTON, Wheatland, MT

Built 1993 Load: 32.7 t ADT: 100

N 15TH RD

Good

Over: NO NAME 149

1M N WORDEN, Yellowstone, MT

Built 2004 Load: 32.7 t ADT: 100

N 17TH RD

Good

Over: ARROW CREEK 147

2M NE WORDEN, Yellowstone, MT

Built 2002 Load: 32.7 t ADT: 100

PRYOR RD

Good

Over: PRYOR CREEK 009

13M S BILLINGS, Yellowstone, MT

Built 2003 Load: 32.7 t ADT: 760

PRYOR RD

Good

Over: 4TH OF JULY CREEK 013

20M S BILLINGS, Yellowstone, MT

Built 2001 Load: 32.7 t ADT: 592

BRIARWOOD BLVD

Good

Over: BLUE CR-GOLF PATH 121

3M SE BILLINGS, Yellowstone, MT

Built 1979 Load: 32.7 t ADT: 100

S 64TH ST W

Good

Over: CANYON CREEK 048

8M NE LAUREL, Yellowstone, MT

Built 1967 Load: 32.7 t ADT: 876

S 48TH ST W

Good

Over: CANYON CREEK 106

2M SW BILLINGS, Yellowstone, MT

Built 1970 Load: 32.7 t ADT: 1,146

S 48TH ST W

Good

Over: BBWA CANAL 107

7M NE LAUREL, Yellowstone, MT

Built 2003 Load: 32.7 t ADT: 1,146

CANYON CREEK RD

Good

Over: CANYON CREEK 185

9M NW LAUREL, Yellowstone, MT

Built 1996 Load: 32.7 t ADT: 100

BENEDICT GULCH RD

Good

Over: COVE DITCH 046

5M W LAUREL, Yellowstone, MT

Built 1996 Load: 32.7 t ADT: 67

N HART RD

Good

Over: BIG DITCH 065

4M W LAUREL, Yellowstone, MT

Built 1994 Load: 32.7 t ADT: 100

S LAUREL RD

Good

Over: BBWA CANAL 028

3M E LAUREL, Yellowstone, MT

Built 2002 Load: 32.7 t ADT: 100

ALEXANDER RD

Good

Over: BBWA CANAL 077

5M N BILLINGS, Yellowstone, MT

Built 1998 Load: 32.7 t ADT: 100

HOMER DAVIS RD

Good

Over: BBWA CANAL 095

6M SW SHEPHERD, Yellowstone, MT

Built 2000 Load: 32.7 t ADT: 100

SCANDIA RD

Good

Over: RAZOR CREEK 092

3M NE SHEPHERD, Yellowstone, MT

Built 2005 Load: 32.7 t ADT: 100

12 MILE ROAD

Good

Over: 12 MILE CREEK 197

3M SW SHEPHERD, Yellowstone, MT

Built 2005 Load: 32.7 t ADT: 100

OLD HWY 312

Good

Over: BBWA CANAL 166

4M NE BILLINGS, Yellowstone, MT

Built 2005 Load: 32.7 t ADT: 11,193

11TH ST W

Good

Over: BBWA CANAL 047

BILLINGS-11TH ST W, Yellowstone, MT

Built 2007 Load: 32.7 t ADT: 100

S 32ND ST W

Good

Over: BBWA CANAL 115

2M SW BILLINGS, Yellowstone, MT

Built 2004 Load: 32.7 t ADT: 2,993

ARONSON AVE

Good

Over: ALKALI CREEK 202

BILLINGS-ARONSON AVE, Yellowstone, MT

Built 2008 Load: 32.7 t ADT: 10,054

INNER BELT LOOP

Good

Over: ALKALI CREEK 208

3M NW BILLINGS, Yellowstone, MT

Built 2014 Load: 32.7 t ADT: 1,171

VALLEY DR

Good

Over: BIG DITCH 111

LAUREL-VALLEY DR, Yellowstone, MT

Built 2008 Load: 32.7 t ADT: 931

VIRGINIA LN

Good

Over: BBWA CANAL

BILLINGS-VIRGINIA LN, Yellowstone, MT

Built 1988 Load: 32.7 t ADT: 4,048

NO DATA ENTERED

Good

Over: WEST FORK ROCK CREEK

NO DATA ENTERED, Carbon, MT

Built 2010 Load: 33.0 t ADT: 40

FOREST ROAD

Good

Over: LOWER TWIN CREEK

CABLE CAR SLIDE AREA, Flathead, MT

Built 1965 Load: 33.0 t ADT: 120

NFSR

Good

Over: BATTERY CREEK

SOUTH FORK FLATHEAD, Flathead, MT

Built 2009 Load: 33.0 t ADT: 40

HYALITE ROAD

Good

Over: HYALITE CREEK

HYALITE CANYON, Gallatin, MT

Built 1988 Load: 33.0 t ADT: 99

WEAVER RD

Good

Over: PINKHAM CREEK

PINKHAM CREEK, Lincoln, MT

Built 1988 Load: 33.0 t ADT: 50

NO DATA ENTERED

Good

Over: SHEEP CREEK

DEADMAN 1, Meagher, MT

Built 1993 Load: 33.0 t ADT: 40

Showing 4,201-4,250 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.