US Bridges

230th Street over Redstone Ck

Good

Sanborn County, South Dakota · 2N & 1.6E Forestburg · Structure no. 000000056126100

Built
1992
33 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
115 ft
3 main spans
Daily traffic
75
2022 count
Owner
County
County Highway Agency

About this bridge

230th Street over Redstone Ck is a concrete continuous slab carrying 230th Street over Redstone Ck in Sanborn County, South Dakota. It was built in 1992, so it is 33 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 75 vehicles a day, roughly 3% of them trucks, projected to reach 75 by 2032. The structure is 115 ft (35.1 m) long and 33 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Carries230th Street
CrossesRedstone Ck
Location2N & 1.6E Forestburg
RouteCounty Highway 0
Coordinates44.05414, -98.07845
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating78.9 US tons
Inventory rating47.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length115 ft (35.1 m)
Longest span43 ft (13.1 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic75 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 230th Street over Redstone Ck built?

It was built in 1992, making it 33 years old in 2025.

What condition is 230th Street over Redstone Ck in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does 230th Street over Redstone Ck carry?

About 75 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 230th Street over Redstone Ck?

The structure is 115 ft (35.1 m) long with a longest span of 43 ft (13.1 m) and a deck 33 ft wide.

Who owns 230th Street over Redstone Ck?

It is owned by the County Highway Agency.