US Bridges

29570 418th Avenue over Beaver Creek

Fair

Bon Homme County, South Dakota · 8.3N & 1.5E of Tyndall · Structure no. 000000005170047

Built
1925
100 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
60
2022 count
Owner
County
County Highway Agency

About this bridge

29570 418th Avenue over Beaver Creek is a concrete continuous culvert carrying 29570 418th Avenue over Beaver Creek in Bon Homme County, South Dakota. It was built in 1925, so it is 100 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 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 60 vehicles a day, roughly 2% of them trucks, projected to reach 60 by 2032. The structure is 29 ft (8.8 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries29570 418th Avenue
CrossesBeaver Creek
Location8.3N & 1.5E of Tyndall
RouteCounty Highway 0
Coordinates43.10223, -97.83235
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2022)
Projected traffic60 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 29570 418th Avenue over Beaver Creek built?

It was built in 1925, making it 100 years old in 2025.

What condition is 29570 418th Avenue over Beaver 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 May 2023.

How much traffic does 29570 418th Avenue over Beaver Creek carry?

About 60 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 29570 418th Avenue over Beaver Creek?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 26 ft wide.

Who owns 29570 418th Avenue over Beaver Creek?

It is owned by the County Highway Agency.