US Bridges

300 Avenue over Sand Ck

PoorPosted for load

Tripp County, South Dakota · 1.4W & 2.1S Keyapaha · Structure no. 000000062040481

Built
1965
60 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
2 main spans
Daily traffic
29
2022 count
Owner
County
County Highway Agency

About this bridge

300 Avenue over Sand Ck is a wood or timber stringer/multi-beam or girder carrying 300 Avenue over Sand Ck in Tripp 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 29 vehicles a day, roughly 3% of them trucks, projected to reach 29 by 2032. The structure is 32 ft (9.8 m) long and 23 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries300 Avenue
CrossesSand Ck
Location1.4W & 2.1S Keyapaha
RouteCounty Highway 0
Coordinates43.08058, -100.16649
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, 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 evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating10.6 US tons
Inventory rating8 US tons

Structure

MaterialWood or Timber
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span16 ft (4.9 m)
Deck width23 ft (6.9 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29 (2022)
Projected traffic29 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 300 Avenue over Sand Ck built?

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

What condition is 300 Avenue over Sand Ck in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does 300 Avenue over Sand Ck carry?

About 29 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 300 Avenue over Sand Ck?

The structure is 32 ft (9.8 m) long with a longest span of 16 ft (4.9 m) and a deck 23 ft wide.

Who owns 300 Avenue over Sand Ck?

It is owned by the County Highway Agency.