US Bridges

48296 307th ST over Ck

Fair

Union County, South Dakota · 5.5S & 3.9E Alcester · Structure no. 000000064129100

Built
1977
48 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
55
2022 count
Owner
County
County Highway Agency

About this bridge

48296 307th ST over Ck is a prestressed concrete tee beam carrying 48296 307th ST over Ck in Union County, South Dakota. It was built in 1977, so it is 48 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 55 vehicles a day, roughly 3% of them trucks, projected to reach 55 by 2032. The structure is 26 ft (7.8 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries48296 307th ST
CrossesCk
Location5.5S & 3.9E Alcester
RouteCounty Highway 0
Coordinates42.93781, -96.54954
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length26 ft (7.8 m)
Longest span24 ft (7.2 m)
Deck width27 ft (8.2 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2022)
Projected traffic55 by 2032
Trucks3%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 48296 307th ST over Ck built?

It was built in 1977, making it 48 years old in 2025.

What condition is 48296 307th ST over 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 August 2024.

How much traffic does 48296 307th ST over Ck carry?

About 55 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 48296 307th ST over Ck?

The structure is 26 ft (7.8 m) long with a longest span of 24 ft (7.2 m) and a deck 27 ft wide.

Who owns 48296 307th ST over Ck?

It is owned by the County Highway Agency.