US Bridges

425th Ave over Ck

PoorPosted for load

Kingsbury County, South Dakota · 2 E & 0.1 S Bancroft · Structure no. 000000039070041

Built
1935
90 years old, rebuilt 1967
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
22 ft
1 main span
Daily traffic
95
2022 count
Owner
County
County Highway Agency

About this bridge

425th Ave over Ck is a steel stringer/multi-beam or girder carrying 425th Ave over Ck in Kingsbury County, South Dakota. It was built in 1935 and reconstructed in 1967, so it is 90 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 95 vehicles a day, roughly 2% of them trucks, projected to reach 110 by 2036. The structure is 22 ft (6.7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries425th Ave
CrossesCk
Location2 E & 0.1 S Bancroft
RouteCounty Highway 0
Coordinates44.48315, -97.71361
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating26.1 US tons
Inventory rating15.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width28 ft (8.6 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95 (2022)
Projected traffic110 by 2036
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$281,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 425th Ave over Ck built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1967.

What condition is 425th Ave over 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 July 2024.

How much traffic does 425th Ave over Ck carry?

About 95 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 425th Ave over Ck?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 28 ft wide.

Who owns 425th Ave over Ck?

It is owned by the County Highway Agency.