US Bridges

41680 306th Street over Silver Creek

Fair

Bon Homme County, South Dakota · 2S & 0.2W of Tyndall · Structure no. 000000005158150

Built
1930
95 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
60
2022 count
Owner
County
County Highway Agency

About this bridge

41680 306th Street over Silver Creek is a concrete continuous culvert carrying 41680 306th Street over Silver Creek in Bon Homme County, South Dakota. It was built in 1930, so it is 95 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 60 vehicles a day, roughly 2% of them trucks, projected to reach 60 by 2032. The structure is 21 ft (6.3 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries41680 306th Street
CrossesSilver Creek
Location2S & 0.2W of Tyndall
Coordinates42.95173, -97.85624
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum 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 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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$332,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 41680 306th Street over Silver Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is 41680 306th Street over Silver 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 41680 306th Street over Silver Creek carry?

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

How long is 41680 306th Street over Silver Creek?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns 41680 306th Street over Silver Creek?

It is owned by the County Highway Agency.