US Bridges

29640 396th Avenue over Choteau Creek

Fair

Charles Mix County, South Dakota · 0.6N & 1.0E of Wagner · Structure no. 000000012520284

Built
1986
39 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
48
2022 count
Owner
County
County Highway Agency

About this bridge

29640 396th Avenue over Choteau Creek is a prestressed concrete tee beam carrying 29640 396th Avenue over Choteau Creek in Charles Mix County, South Dakota. It was built in 1986, so it is 39 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 48 vehicles a day, roughly 2% of them trucks, projected to reach 48 by 2032. The structure is 51 ft (15.4 m) long and 23 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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Carries29640 396th Avenue
CrossesChoteau Creek
Location0.6N & 1.0E of Wagner
CountyCharles Mix County
StateSouth Dakota
Coordinates43.09087, -98.26824
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length51 ft (15.4 m)
Longest span49 ft (14.9 m)
Deck width23 ft (7 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48 (2022)
Projected traffic48 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 29640 396th Avenue over Choteau Creek built?

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

What condition is 29640 396th Avenue over Choteau Creek 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 October 2023.

How much traffic does 29640 396th Avenue over Choteau Creek carry?

About 48 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 29640 396th Avenue over Choteau Creek?

The structure is 51 ft (15.4 m) long with a longest span of 49 ft (14.9 m) and a deck 23 ft wide.

Who owns 29640 396th Avenue over Choteau Creek?

It is owned by the County Highway Agency.