US Bridges

Robins Roost Road over Spring Ck

FairPosted for load

Pennington County, South Dakota · 2E & 0.8N Hill City · Structure no. 000000052261399

Built
1964
61 years old
Condition
Fair
inspected June 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
65
2022 count
Owner
County
County Highway Agency

About this bridge

Robins Roost Road over Spring Ck is a concrete channel beam carrying Robins Roost Road over Spring Ck in Pennington County, South Dakota. It was built in 1964, so it is 61 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. Its operating status is: posted for load restriction.

It carries about 65 vehicles a day, roughly 2% of them trucks, projected to reach 65 by 2034. The structure is 31 ft (9.4 m) long and 22 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesRobins Roost Road
CrossesSpring Ck
Location2E & 0.8N Hill City
RouteCounty Highway 0
Coordinates43.94248, -103.53611
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating20.4 US tons
Inventory rating15.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width22 ft (6.8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2022)
Projected traffic65 by 2034
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Robins Roost Road over Spring Ck built?

It was built in 1964, making it 61 years old in 2025.

What condition is Robins Roost Road over Spring 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 June 2023.

How much traffic does Robins Roost Road over Spring Ck carry?

About 65 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Robins Roost Road over Spring Ck?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.

Who owns Robins Roost Road over Spring Ck?

It is owned by the County Highway Agency.