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

I 15

Fair

Over: INT BUXTON-BUXTON RD

5.6M S ROCKER, Silver Bow, MT

Built 1976 Load: 24.5 t ADT: 2,537

I 15

Fair

Over: SEP GALENA GULCH ROAD

4.3M E BASIN, Jefferson, MT

Built 1981 Load: 24.5 t ADT: 3,807

I 15

Fair

Over: ABANDONED RR

0.6M S MONTANA CITY, Jefferson, MT

Built 1969 Load: 24.5 t ADT: 3,739

I 90

Fair

Over: INT SALTESE

SALTESE, Mineral, MT

Built 1973 Load: 24.5 t ADT: 7,745

I 90

Fair

Over: ST. REGIS RVR-INT RAMP

3.7M W ST. REGIS, Mineral, MT

Built 1981 Load: 24.5 t ADT: 22

I 90

Fair

Over: INT ST. REGIS

ST. REGIS, Mineral, MT

Built 1983 Load: 24.5 t ADT: 3,513

I 90

Fair

Over: INT ST. REGIS

ST. REGIS, Mineral, MT

Built 1983 Load: 24.5 t ADT: 3,513

I 90 WB

Fair

Over: SEP RED HILL ROAD

0.6M E ST. REGIS, Mineral, MT

Built 1978 Load: 24.5 t ADT: 3,513

I 90 EB

Fair

Over: INT TURAH

TURAH, Missoula, MT

Built 1964 Load: 24.5 t ADT: 5,554

I 90

Fair

Over: KEYSER CREEK

1.2M W COLUMBUS, Stillwater, MT

Built 1971 Load: 24.5 t ADT: 5,961

I 90

Fair

Over: KEYSER CREEK

1.2M W COLUMBUS, Stillwater, MT

Built 1971 Load: 24.5 t ADT: 5,961

443 RAMP-I 90

Fair

Over: SHILOH INTERCHANGE

BILLINGS, Yellowstone, MT

Built 2001 Load: 24.5 t ADT: 5,463

I 90

Fair

Over: INT PINEHILL-I 94

3.7M E BILLINGS, Yellowstone, MT

Built 1967 Load: 24.5 t ADT: 8,381

I 90

Fair

Over: OLD HARDIN RD

4.3M E BILLINGS, Yellowstone, MT

Built 1969 Load: 24.5 t ADT: 4,191

I 94

Fair

Over: ARMELLS CR-RR

6M W FORSYTH, Rosebud, MT

Built 1972 Load: 24.5 t ADT: 2,138

I 94

Fair

Over: RR

SW FALLON, Prairie, MT

Built 1977 Load: 24.5 t ADT: 1,914

I 94

Fair

Over: GLENDIVE CREEK

1M E GLENDIVE, Dawson, MT

Built 1969 Load: 24.5 t ADT: 2,082

I 94

Fair

Over: GLENDIVE CREEK

1M E GLENDIVE, Dawson, MT

Built 1969 Load: 24.5 t ADT: 2,082

FRYING PAN RD

Fair

Over: SEP I 15 126

3M N DILLON, Beaverhead, MT

Built 1973 Load: 24.5 t ADT: 350

SWEETWATER RD

Fair

Over: EAST BENCH CANAL 060

3M E DILLON, Beaverhead, MT

Built 1962 Load: 24.5 t ADT: 100

BAGAN RD

Fair

Over: BATTLE CREEK 060

3M E CHINOOK, Blaine, MT

Built 1940 Load: 24.5 t ADT: 83

KLINDWORTH RD

Fair

Over: WOODY ISLAND COULEE 136

5M N HOGELAND, Blaine, MT

Built 2001 Load: 24.5 t ADT: 100

CENTRAL AVE W

Fair

Over: DRAINAGE 117

HARLEM, Blaine, MT

Built 1939 Load: 24.5 t ADT: 581

BRIDGER FROMBERG R

Fair

Over: BLUEWATER CREEK 001

2M SE FROMBERG, Carbon, MT

Built 1913 Load: 24.5 t ADT: 218

LOWER RIVER RD

Fair

Over: BLUEWATER CREEK 002

1M SE FROMBERG, Carbon, MT

Built 1932 Load: 24.5 t ADT: 100

OLD US 91

Fair

Over: NOVAK CREEK 005

12M S CASCADE, Cascade, MT

Built 1931 Load: 24.5 t ADT: 314

FRNTAGE ROAD 81020

Fair

Over: COTTONWOOD CREEK 083

19M NE MILES CITY, Custer, MT

Built 1928 Load: 24.5 t ADT: 504

KIRCHER CREEK RD

Fair

Over: T AND Y CANAL 032

4M NE MILES CITY, Custer, MT

Built 1938 Load: 24.5 t ADT: 100

POWDERVILLE RD

Fair

Over: SPRING CREEK 019

51M S MILES CITY, Custer, MT

Built 1912 Load: 24.5 t ADT: 47

FRONTAGE ROAD 315

Fair

Over: GLENDIVE CREEK 084

1M E GLENDIVE, Dawson, MT

Built 1969 Load: 24.5 t ADT: 623

SURENUFF RD

Fair

Over: S FORK MCDONALD CR 002

FOREST GROVE, Fergus, MT

Built 1982 Load: 24.5 t ADT: 100

E EDGEWOOD DR

Fair

Over: HASKILL CREEK 071

2M E WHITEFISH, Flathead, MT

Built 1994 Load: 24.5 t ADT: 1,188

BELMONT RD

Fair

Over: BIG COULEE CREEK 010

2M S LAVINA, Golden Valley, MT

Built 1975 Load: 24.5 t ADT: 10

FRESNO RES RD

Fair

Over: FRESNO RES SPILLWAY 038

12M NW HAVRE, Hill, MT

Built 1937 Load: 24.5 t ADT: 231

CATTLE DRIVE RD

Fair

Over: BOULDER RIVER 017

2M W BOULDER, Jefferson, MT

Built 1983 Load: 24.5 t ADT: 100

I 15 FRONTAGE RD

Fair

Over: BISON CREEK 047

4M W BASIN, Jefferson, MT

Built 1985 Load: 24.5 t ADT: 100

MT HWY 2

Fair

Over: BOULDER RIVER 064

1M E CARDWELL, Jefferson, MT

Built 1968 Load: 24.5 t ADT: 385

TEBAY LN

Fair

Over: JEFFERSON RIVER 012

3M W CARDWELL, Jefferson, MT

Built 1986 Load: 24.5 t ADT: 177

PHILBROOK RD

Fair

Over: JUDITH RIVER 013

4M W HOBSON, Judith Basin, MT

Built 1983 Load: 24.5 t ADT: 100

JOCKO CANYON RD

Fair

Over: JOCKO RIVER 012

7M E ARLEE, Lake, MT

Built 1976 Load: 24.5 t ADT: 100

N VALLEY CREEK RD

Fair

Over: VALLEY CREEK 055

3M S RAVALLI, Lake, MT

Built 1960 Load: 24.5 t ADT: 451

S RECREATION RD

Fair

Over: SHEEP CREEK 117

2M S WOLF CREEK, Lewis and Clark, MT

Built 1933 Load: 24.5 t ADT: 390

LAKE HELENA DR

Fair

Over: CAUSEWAY-LAKE HELENA 072

8M N EAST HELENA, Lewis and Clark, MT

Built 1944 Load: 24.5 t ADT: 861

GLASS DR

Fair

Over: HELENA VALLEY CANAL 150

11M N HELENA, Lewis and Clark, MT

Built 1958 Load: 24.5 t ADT: 615

STEMPLE PASS RD

Fair

Over: BLACKFOOT RIVER 118

.5M S LINCOLN, Lewis and Clark, MT

Built 1959 Load: 24.5 t ADT: 299

FISH CREEK RD

Fair

Over: INT FISH CREEK-I 90 009

4M E TARKIO, Mineral, MT

Built 1965 Load: 24.5 t ADT: 349

MULLAN GULCH RD

Fair

Over: ROCK CREEK 013

HENDERSON, Mineral, MT

Built 1931 Load: 24.5 t ADT: 147

BRACKETT CREEK RD

Fair

Over: SHIELDS RIVER 007

W CLYDE PARK, Park, MT

Built 1980 Load: 24.5 t ADT: 273

MAIN BOULDER RD

Fair

Over: BOULDER RIVER 040

31M S SPRINGDALE, Park, MT

Built 1938 Load: 24.5 t ADT: 156

MIDALE RD

Fair

Over: SECOND CREEK 047

43M S MALTA, Phillips, MT

Built 1983 Load: 24.5 t ADT: 100

Showing 1,001-1,050 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.