US Bridges

401st Avenue over Enemy Ck

Good

Davison County, South Dakota · 5.3S & 4E Mt Vernon · Structure no. 000000018070153

Built
2021
4 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
64
2022 count
Owner
County
County Highway Agency

About this bridge

401st Avenue over Enemy Ck is a prestressed concrete stringer/multi-beam or girder carrying 401st Avenue over Enemy Ck in Davison County, South Dakota. It was built in 2021, so it is 4 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 64 vehicles a day, roughly 2% of them trucks, projected to reach 64 by 2032. The structure is 87 ft (26.5 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries401st Avenue
CrossesEnemy Ck
Location5.3S & 4E Mt Vernon
RouteCounty Highway 0
Coordinates43.62538, -98.18648
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating67.6 US tons
Inventory rating51.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length87 ft (26.5 m)
Longest span83 ft (25.3 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64 (2022)
Projected traffic64 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 401st Avenue over Enemy Ck built?

It was built in 2021, making it 4 years old in 2025.

What condition is 401st 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 401st Avenue over Enemy Ck carry?

About 64 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 401st Avenue over Enemy Ck?

The structure is 87 ft (26.5 m) long with a longest span of 83 ft (25.3 m) and a deck 31 ft wide.

Who owns 401st Avenue over Enemy Ck?

It is owned by the County Highway Agency.