US Bridges

420th Avenue over Creek

Good

Day County, South Dakota · 1E & 1.7N of Pierpont · Structure no. 000000019080043

Built
2009
16 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
25
2022 count
Owner
County
County Highway Agency

About this bridge

420th Avenue over Creek is a concrete continuous culvert carrying 420th Avenue over Creek in Day County, South Dakota. It was built in 2009, so it is 16 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 25 vehicles a day, roughly 2% of them trucks, projected to reach 25 by 2032. The structure is 26 ft (8 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Carries420th Avenue
CrossesCreek
Location1E & 1.7N of Pierpont
RouteCounty Highway 0
Coordinates45.52603, -97.8165
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
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating43.4 US tons
Inventory rating33.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length26 ft (8 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2022)
Projected traffic25 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 420th Avenue over Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is 420th Avenue over Creek 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 September 2024.

How much traffic does 420th Avenue over Creek carry?

About 25 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 420th Avenue over Creek?

The structure is 26 ft (8 m) long with a longest span of 11 ft (3.4 m).

Who owns 420th Avenue over Creek?

It is owned by the County Highway Agency.