US Bridges

39550 280 ST over Choteau Ck

Good

Douglas County, South Dakota · 0.5N & 3.5E of Armour · Structure no. 000000022215120

Built
2023
2 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete Continuous
Length
65 ft
5 main spans
Daily traffic
407
2022 count
Owner
County
County Highway Agency

About this bridge

39550 280 ST over Choteau Ck is a concrete continuous culvert carrying 39550 280 ST over Choteau Ck in Douglas County, South Dakota. It was built in 2023, so it is 2 years old, younger than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 407 vehicles a day, roughly 3% of them trucks, projected to reach 407 by 2032. The structure is 65 ft (19.8 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries39550 280 ST
CrossesChoteau Ck
Location0.5N & 3.5E of Armour
RouteCounty Highway 0
Coordinates43.32575, -98.27568
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating59.3 US tons
Inventory rating45.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans5
Design loadHL 93
Structure length65 ft (19.8 m)
Longest span12 ft (3.8 m)
Deck width24 ft (7.3 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic407 (2022)
Projected traffic407 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 39550 280 ST over Choteau Ck built?

It was built in 2023, making it 2 years old in 2025.

What condition is 39550 280 ST over Choteau Ck in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does 39550 280 ST over Choteau Ck carry?

About 407 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 39550 280 ST over Choteau Ck?

The structure is 65 ft (19.8 m) long with a longest span of 12 ft (3.8 m) and a deck 24 ft wide.

Who owns 39550 280 ST over Choteau Ck?

It is owned by the County Highway Agency.