US Bridges

Mail RD over Ck

Good

Butte County, South Dakota · 2W 7N Nisland · Structure no. 000000010230302

Built
1998
27 years old
Condition
Good
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
53
2022 count
Owner
County
County Highway Agency

About this bridge

Mail RD over Ck is a prestressed concrete tee beam carrying Mail RD over Ck in Butte County, South Dakota. It was built in 1998, so it is 27 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 53 vehicles a day, roughly 2% of them trucks, projected to reach 60 by 2032. The structure is 62 ft (18.8 m) long and 27 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesMail RD
CrossesCk
Location2W 7N Nisland
RouteCounty Highway 0
Coordinates44.77463, -103.58807
Functional classRural Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 alignment9: Superior 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 length62 ft (18.8 m)
Longest span60 ft (18.2 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53 (2022)
Projected traffic60 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Mail RD over Ck built?

It was built in 1998, making it 27 years old in 2025.

What condition is Mail RD over 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 Mail RD over Ck carry?

About 53 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Mail RD over Ck?

The structure is 62 ft (18.8 m) long with a longest span of 60 ft (18.2 m) and a deck 27 ft wide.

Who owns Mail RD over Ck?

It is owned by the County Highway Agency.