US Bridges

400th Avenue over Enemy Ck

Good

Davison County, South Dakota · 9 W & 5.3 S Mitchell · Structure no. 000000018060153

Built
1990
35 years old
Condition
Good
inspected July 2024
Type
Tee Beam
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
38
2022 count
Owner
County
County Highway Agency

About this bridge

400th Avenue over Enemy Ck is a prestressed concrete tee beam carrying 400th Avenue over Enemy Ck in Davison County, South Dakota. It was built in 1990, so it is 35 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 38 vehicles a day, roughly 2% of them trucks, projected to reach 38 by 2032. The structure is 50 ft (15.1 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries400th Avenue
CrossesEnemy Ck
Location9 W & 5.3 S Mitchell
RouteCounty Highway 0
Coordinates43.62563, -98.20553
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length50 ft (15.1 m)
Longest span49 ft (14.9 m)
Deck width27 ft (8.2 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38 (2022)
Projected traffic38 by 2032
Trucks2%
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 400th Avenue over Enemy Ck built?

It was built in 1990, making it 35 years old in 2025.

What condition is 400th Avenue over Enemy 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 July 2024.

How much traffic does 400th Avenue over Enemy Ck carry?

About 38 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 400th Avenue over Enemy Ck?

The structure is 50 ft (15.1 m) long with a longest span of 49 ft (14.9 m) and a deck 27 ft wide.

Who owns 400th Avenue over Enemy Ck?

It is owned by the County Highway Agency.