US Bridges

41790 246 St. over Rock Ck

Fair

Hanson County, South Dakota · 6 N & 1.1 W Fulton · Structure no. 000000031059020

Built
1985
40 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
35
2022 count
Owner
County
County Highway Agency

About this bridge

41790 246 St. over Rock Ck is a prestressed concrete tee beam carrying 41790 246 St. over Rock Ck in Hanson County, South Dakota. It was built in 1985, so it is 40 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 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 35 vehicles a day, roughly 2% of them trucks, projected to reach 35 by 2032. The structure is 40 ft (12.2 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Carries41790 246 St.
CrossesRock Ck
Location6 N & 1.1 W Fulton
RouteCounty Highway 0
Coordinates43.81871, -97.85062
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2022)
Projected traffic35 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$16,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 41790 246 St. over Rock Ck built?

It was built in 1985, making it 40 years old in 2025.

What condition is 41790 246 St. over Rock Ck 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 July 2023.

How much traffic does 41790 246 St. over Rock Ck carry?

About 35 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 41790 246 St. over Rock Ck?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 31 ft wide.

Who owns 41790 246 St. over Rock Ck?

It is owned by the County Highway Agency.