US Bridges

30640 418th Avenue over Deadman Creek

Fair

Bon Homme County, South Dakota · 1.5E & 2.4S of Tyndall · Structure no. 000000005170154

Built
1941
84 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
25
2022 count
Owner
County
County Highway Agency

About this bridge

30640 418th Avenue over Deadman Creek is a concrete continuous culvert carrying 30640 418th Avenue over Deadman Creek in Bon Homme County, South Dakota. It was built in 1941, so it is 84 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 5 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 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 1.9 mi (3 km).

Location

Open in Google Maps
Carries30640 418th Avenue
CrossesDeadman Creek
Location1.5E & 2.4S of Tyndall
CountyBon Homme County
StateSouth Dakota
Coordinates42.94504, -97.83259
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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 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 adequacy7: Better than present minimum 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 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 closed1.9 mi (3 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 30640 418th Avenue over Deadman Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is 30640 418th Avenue over Deadman 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 30640 418th Avenue over Deadman Creek carry?

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

How long is 30640 418th Avenue over Deadman Creek?

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

Who owns 30640 418th Avenue over Deadman Creek?

It is owned by the County Highway Agency.