US Bridges

475th Avenue over Ck

FairPosted for load

Brookings County, South Dakota · 2.9N & 3W Bushnell · Structure no. 000000006210121

Built
1930
95 years old
Condition
Fair
inspected September 2023
Type
Truss - Thru
Steel
Length
43 ft
1 main span
Daily traffic
92
2022 count
Owner
County
County Highway Agency

About this bridge

475th Avenue over Ck is a steel truss - thru carrying 475th Avenue over Ck in Brookings County, South Dakota. It was built in 1930, so it is 95 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 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. Its operating status is: posted for load restriction.

It carries about 92 vehicles a day, roughly 2% of them trucks, projected to reach 92 by 2032. The structure is 43 ft (13.1 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries475th Avenue
CrossesCk
Location2.9N & 3W Bushnell
RouteCounty Highway 0
CountyBrookings County
StateSouth Dakota
Coordinates44.36889, -96.70716
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating22.5 US tons
Inventory rating10.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length43 ft (13.1 m)
Longest span40 ft (12.3 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic92 (2022)
Projected traffic92 by 2032
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 statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$921,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 475th Avenue over Ck built?

It was built in 1930, making it 95 years old in 2025.

What condition is 475th Avenue 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 September 2023.

How much traffic does 475th Avenue over Ck carry?

About 92 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 475th Avenue over Ck?

The structure is 43 ft (13.1 m) long with a longest span of 40 ft (12.3 m) and a deck 18 ft wide.

Who owns 475th Avenue over Ck?

It is owned by the County Highway Agency.