US Bridges

41800 247 Street over Rock Ck

Fair

Hanson County, South Dakota · 3 E of Plano · Structure no. 000000031060030

Built
1965
60 years old
Condition
Fair
inspected July 2023
Type
Channel Beam
Concrete
Length
62 ft
2 main spans
Daily traffic
245
2022 count
Owner
County
County Highway Agency

About this bridge

41800 247 Street over Rock Ck is a concrete channel beam carrying 41800 247 Street over Rock Ck in Hanson County, South Dakota. It was built in 1965, so it is 60 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 245 vehicles a day, roughly 3% of them trucks, projected to reach 245 by 2032. The structure is 62 ft (18.9 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Carries41800 247 Street
CrossesRock Ck
Location3 E of Plano
RouteCounty Highway 0
Coordinates43.80422, -97.85065
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadUnknown
Structure length62 ft (18.9 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic245 (2022)
Projected traffic245 by 2032
Trucks3%
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$23,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 41800 247 Street over Rock Ck built?

It was built in 1965, making it 60 years old in 2025.

What condition is 41800 247 Street 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 41800 247 Street over Rock Ck carry?

About 245 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 41800 247 Street over Rock Ck?

The structure is 62 ft (18.9 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns 41800 247 Street over Rock Ck?

It is owned by the County Highway Agency.