US Bridges

299th Avenue over Unnamed Creek

Good

Lyman County, South Dakota · 6W & 7.8N of Presho · Structure no. 000000043090122

Built
1968
57 years old
Condition
Good
inspected June 2022
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
25
2022 count
Owner
County
County Highway Agency

About this bridge

299th Avenue over Unnamed Creek is a concrete continuous culvert carrying 299th Avenue over Unnamed Creek in Lyman County, South Dakota. It was built in 1968, so it is 57 years old, older 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 21 ft (6.3 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Carries299th Avenue
CrossesUnnamed Creek
Location6W & 7.8N of Presho
RouteCounty Highway 0
Coordinates44.01882, -100.18633
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 protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating28.1 US tons
Inventory rating21.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.3 m)
Longest span10 ft (3 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 closed8.7 mi (14 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 299th Avenue over Unnamed Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is 299th Avenue over Unnamed 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 June 2022.

How much traffic does 299th Avenue over Unnamed Creek carry?

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

How long is 299th Avenue over Unnamed Creek?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns 299th Avenue over Unnamed Creek?

It is owned by the County Highway Agency.