US Bridges

Cottonwood CR RD over Willow Creek 020

FairPosted for load

Carter County, Montana · 8M NW Alzada · Structure no. L06042020+05001

Built
1986
39 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
89 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Cottonwood CR RD over Willow Creek 020 is a steel stringer/multi-beam or girder carrying Cottonwood CR RD over Willow Creek 020 in Carter County, Montana. It was built in 1986, so it is 39 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 89 ft (27.1 m) long and 18 ft wide. If it were closed, the detour would be 62.1 mi (100 km).

CarriesCottonwood CR RD
CrossesWillow Creek 020
Location8M NW Alzada
RouteCounty Highway 6042
StateMontana
Coordinates45.09927, -104.53278
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating5 US tons
Inventory rating5 US tons

Structure

MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length89 ft (27.1 m)
Longest span60 ft (18.3 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed62.1 mi (100 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$261,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Cottonwood CR RD over Willow Creek 020 built?

It was built in 1986, making it 39 years old in 2025.

What condition is Cottonwood CR RD over Willow Creek 020 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does Cottonwood CR RD over Willow Creek 020 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Cottonwood CR RD over Willow Creek 020?

The structure is 89 ft (27.1 m) long with a longest span of 60 ft (18.3 m) and a deck 18 ft wide.

Who owns Cottonwood CR RD over Willow Creek 020?

It is owned by the County Highway Agency.