State profile · Near median Poor share

Montana bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in Montana.

5,224
Public bridges
31.5%
Good condition
6.8%
Poor condition

Montana holds 5,224 public highway bridges (#36 of 52 by inventory) with a 6.81% Poor share (#20 of 52 by Poor share).

That is 6.8% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 33 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

5,224

Public highway bridges in Montana

Good Condition

31.5%

1,646 bridges rated 7-9

-18.5pp vs 50% benchmark

Poor Condition

6.8%

356 bridges whose lowest applicable component is rated 0-4

-0.7pp vs national avg 7.5%

Montana vs national bridge condition

Montana - Good condition share 31.5%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Montana - Poor-condition share 22.7%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

Montana in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: Montana has 5,224 bridges and a 6.8% Poor-condition share in the 2024 NBI, rank #33 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: Montana has 5,224 bridges and a 6.8% Poor-condition share in the 2024 NBI, rank #33 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

Montana vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

5,224 36th of 54 higher than 18 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for Montana

The highlighted point is Montana: 5,224 bridges and 6.81% in Poor condition, rank #33 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below Montana on that same Poor-share ordering:

  • Hawaii: 1,195 bridges · 6.53% Poor
  • North Carolina: 19,210 bridges · 6.76% Poor
  • Montana: 5,224 bridges · 6.81% Poor
  • Kentucky: 14,548 bridges · 7.37% Poor
  • New Hampshire: 2,542 bridges · 7.51% Poor

The full national sortable table lives on the rankings page.

Material families in Montana

Exclusive FHWA material families across all 5,224 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains Montana’s inventory

State agency holds 46.3% of the 5,224 public highway bridges filed under Montana in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When Montana’s bridges were built

Pre-1950 construction accounts for 11.7% of the 5,224 bridges with a recorded original year in Montana. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

Montana31.5%61.7%GoodFairPoor
Bridge inventory deck-condition mix - Montana (FHWA NBI)

Counties (56)

Beaverhead 226 Big Horn 135 Blaine 102 Broadwater 37 Carbon 80 Carter 41 Cascade 185 Chouteau 42 Custer 71 Daniels 33 Dawson 109 Deer Lodge 68 Fallon 37 Fergus 158 Flathead 204 Gallatin 210 Garfield 26 Glacier 71 Golden Valley 17 Granite 73 Hill 46 Jefferson 134 Judith Basin 48 Lake 117 Lewis and Clark 200 Liberty 11 Lincoln 190 Madison 97 McCone 44 Meagher 53 Mineral 152 Missoula 206 Musselshell 28 Park 124 Petroleum 26 Phillips 101 Pondera 96 Powder River 23 Powell 113 Prairie 46 Ravalli 148 Richland 97 Roosevelt 57 Rosebud 114 Sanders 120 Sheridan 66 Silver Bow 68 Stillwater 92 Sweet Grass 94 Teton 82 Toole 35 Treasure 26 Valley 104 Wheatland 26 Wibaux 25 Yellowstone 290

Montana vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Montana on the same metric.

HI

Hawaii

6.53% top marginal rate
Structure
Progressive
Burden @ $100K
$1,195

NC

North Carolina

6.76% top marginal rate
Structure
Progressive
Burden @ $100K
$19,210
Selected

MT

Montana

6.81% top marginal rate
Structure
Progressive
Burden @ $100K
$5,224

KY

Kentucky

7.37% top marginal rate
Structure
Progressive
Burden @ $100K
$14,548

NH

New Hampshire

7.51% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

Bridges Needing Most Attention in Montana

Six lowest-condition bridges in Montana, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

UPPER HIGHWOOD CR

Poor

Over: HIGHWOOD CREEK 076

4M SE HIGHWOOD, Chouteau, MT

Built 1969 Load: 0.0 t ADT: 100

ROAD 290 N

Poor

Over: CANADIAN COULEE 036

30M N INVERNESS, Hill, MT

Built 1980 Load: 0.0 t ADT: 100

BLACK COULEE RD

Poor

Over: BLACK COULEE 072

28M N DODSON, Phillips, MT

Built 1950 Load: 0.0 t ADT: 49

SLEEPY HOLLOW LN

Poor

Over: PRICKLY PEAR CREEK

3 M S MONTANA CITY, Jefferson, MT

Built 2010 Load: 2.7 t ADT: 100

HWY 91 N

Poor

Over: BIG HOLE RIVER 041

22M N DILLON, Beaverhead, MT

Built 1940 Load: 2.7 t ADT: 155

CARBINE RD

Poor

Over: PABLO CANAL 026

4M W PABLO, Lake, MT

Built 1986 Load: 2.7 t ADT: 100

All Bridges in Montana

W GROVE ST

Good

Over: ROSEBUD CREEK

ABSAROKEE-W GROVE ST, Stillwater, MT

Built 1989 Load: 44.5 t ADT: 504

MULLOWNEY LN

Good

Over: RR

BILLINGS-MULLOWNEY LN, Yellowstone, MT

Built 2007 Load: 44.5 t ADT: 20,106

E CUSTER AVE

Good

Over: HELENA VALLEY CANAL

HELENA-E CUSTER AVE, Lewis and Clark, MT

Built 2012 Load: 44.5 t ADT: 13,133

IRR BIA RTE 55

Good

Over: BOX ELDER CREEK

3.6 KM NW OF ROCKY BOYS, Hill, MT

Built 2003 Load: 44.6 t ADT: 10

NO DATA ENTERED

Good

Over: SF LITTLE JOE CREEK

NO DATA ENTERED, Mineral, MT

Built 2020 Load: 45.0 t ADT: 50

MT-43 FH 20

Good

Over: TRAIL CREEK

17 M W WISDOM, Beaverhead, MT

Built 2021 Load: 45.4 t ADT: 431

MT-43 FH 20

Good

Over: TRAIL CREEK

16 M W WISDOM, Beaverhead, MT

Built 2021 Load: 45.4 t ADT: 431

AUTO TOUR ROAD

Good

Over: DIKE TO BEAVER CREEK

SECT 1 BOWDOIN LAKE, Phillips, MT

Built 1987 Load: 45.4 t ADT: 20

I 15

Good

Over: SEP LYONS CREEK ROAD

6M S WOLF CREEK, Lewis and Clark, MT

Built 1964 Load: 45.4 t ADT: 2,522

I 15

Good

Over: RR

2M N CRAIG, Lewis and Clark, MT

Built 1967 Load: 45.4 t ADT: 2,224

ACKLEY LAKE RD

Good

Over: JUDITH RIVER 009

1M E UTICA, Judith Basin, MT

Built 2008 Load: 45.4 t ADT: 100

US 93

Good

Over: SPRING CREEK

3M S RAVALLI, Lake, MT

Built 2006 Load: 45.4 t ADT: 8,330

US 93

Good

Over: SOUTH BASS CREEK

4M N STEVENSVILLE, Ravalli, MT

Built 2005 Load: 45.4 t ADT: 11,080

OVERLOOK DR

Good

Over: RR BY WATERWORKS

GREAT FALLS-OVERLOOK DR, Cascade, MT

Built 2009 Load: 45.4 t ADT: 5,117

SHIELDS RIVER ROAD

Good

Over: SHIELDS RIVER

NO DATA ENTERED, Meagher, MT

Built 2016 Load: 45.7 t ADT: 50

ROCK CREEK LAKE RD

Good

Over: ROCK CREEK 079

8M NW DEER LODGE, Powell, MT

Built 2009 Load: 45.7 t ADT: 100

I 15

Good

Over: SILVERBOW CREEK-RR

1.2 N W BUTTE, Silver Bow, MT

Built 2019 Load: 46.3 t ADT: 6,807

S 327

Good

Over: LITTLE MUDDY CREEK

3M SE BAINVILLE, Roosevelt, MT

Built 2020 Load: 46.3 t ADT: 280

I 15

Good

Over: BOULDER RIVER

4.3M S BASIN, Jefferson, MT

Built 1985 Load: 46.3 t ADT: 1,571

I 90

Good

Over: BAKER CREEK

1.9M E MANHATTAN, Gallatin, MT

Built 1965 Load: 46.3 t ADT: 9,601

I 90

Good

Over: BAKER CREEK

1.9M E MANHATTAN, Gallatin, MT

Built 1965 Load: 46.3 t ADT: 9,601

PIONEER RD

Good

Over: JUDITH RIVER 011

4M NE HOBSON, Judith Basin, MT

Built 2006 Load: 46.3 t ADT: 18

MCDONALD LAKE RD

Good

Over: PABLO FEEDER CANAL 077

7M NE ST IGNATIUS, Lake, MT

Built 2004 Load: 46.3 t ADT: 100

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

1M S RAVALLI, Lake, MT

Built 2006 Load: 46.3 t ADT: 8,330

US 87

Good

Over: OTTER CREEK

5M SE BELT, Cascade, MT

Built 1959 Load: 46.3 t ADT: 1,078

IRR - US 191

Good

Over: WEST ALKALI CREEK

13M SW MALTA, Phillips, MT

Built 2008 Load: 46.3 t ADT: 375

BROADWAY AVE

Good

Over: HIGHWOOD CREEK

HIGHWOOD, Chouteau, MT

Built 1999 Load: 46.3 t ADT: 370

S 508 FH 62

Good

Over: HELLROARING CREEK

10M SW YAAK, Lincoln, MT

Built 1994 Load: 46.3 t ADT: 255

NO DATA ENTERED

Good

Over: WARM SPRINGS CR

HIGHWAY ENTERANCE TO AJC, Deer Lodge, MT

Built 1979 Load: 46.7 t ADT: 50

FIELDS GULCH ROAD

Good

Over: POORMAN CREEK

FIELDS GULCH ROAD, Lewis and Clark, MT

Built 2013 Load: 47.0 t ADT: 20

ROAD 522

Good

Over: BARNUM CR

522 AT .6 MP, Flathead, MT

Built 1986 Load: 47.0 t ADT: 50

US 287

Good

Over: SIX MILE CREEK

1M N TOSTON, Broadwater, MT

Built 2020 Load: 47.2 t ADT: 4,885

I 15

Good

Over: INT N CASCADE

CASCADE, Cascade, MT

Built 1977 Load: 47.2 t ADT: 2,162

CAMP NINE RD

Good

Over: ST MARY RIVER 054

7M N BABB, Glacier, MT

Built 2008 Load: 47.2 t ADT: 100

RIVULET RD

Good

Over: FISH CREEK 058

2M E RIVULET, Mineral, MT

Built 1986 Load: 47.2 t ADT: 349

US 2

Good

Over: SAGE CREEK

GILDFORD, Hill, MT

Built 1958 Load: 47.2 t ADT: 1,313

US 87

Good

Over: OTTER CREEK

3M SE BELT, Cascade, MT

Built 1959 Load: 47.2 t ADT: 1,078

US 87

Good

Over: OTTER CREEK

4M SE BELT, Cascade, MT

Built 1959 Load: 47.2 t ADT: 1,078

S 200

Good

Over: OLIVER COULEE

4M E JORDAN, Garfield, MT

Built 2004 Load: 47.2 t ADT: 514

S 213

Good

Over: RR

CUT BANK, Glacier, MT

Built 2012 Load: 47.2 t ADT: 1,313

PRAIRIE VIEW DR

Good

Over: SANDSTONE CREEK 059

W EDGE BAKER, Fallon, MT

Built 2012 Load: 48.1 t ADT: 100

NORTH FORK RD

Good

Over: COAL CREEK 052

8M SE POLEBRIDGE, Flathead, MT

Built 1979 Load: 48.1 t ADT: 530

COUNTY ROAD 141

Good

Over: S FK SANDSTONE CREEK 048

8M SE PLEVNA, Fallon, MT

Built 2012 Load: 49.0 t ADT: 100

CAMP CREEK RD

Good

Over: CAMP CREEK 017

AMSTERDAM, Gallatin, MT

Built 2002 Load: 49.0 t ADT: 100

WILLOUGHBY LN

Good

Over: SUPPLY DITCH 085

4M S STEVENSVILLE, Ravalli, MT

Built 2014 Load: 49.0 t ADT: 629

S 508 FH 62

Good

Over: CYCLONE CREEK

15M SW YAAK, Lincoln, MT

Built 1994 Load: 49.0 t ADT: 255

AIRPORT RD

Good

Over: E GALLATIN RIVER 097

3M E BELGRADE, Gallatin, MT

Built 2012 Load: 49.2 t ADT: 100

S 13

Good

Over: DRAINAGE

1M N VIDA, McCone, MT

Built 1994 Load: 49.9 t ADT: 896

US 87

Good

Over: OTTER CREEK

3M SE BELT, Cascade, MT

Built 1959 Load: 49.9 t ADT: 1,078

IRR - S 313

Good

Over: SOAP CREEK

9M SW ST XAVIER, Big Horn, MT

Built 1963 Load: 49.9 t ADT: 617

Showing 4,701-4,750 of 5,224 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

What to do with this

Use Montana's inventory picture to drill to a county or a specific span.

  • Browse counties in Montana and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Montana Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.