US Bridges

405th Ave over Foster Creek

PoorPosted for load

Spink County, South Dakota · 1W & 3.2N Bloomfield · Structure no. 000000058290388

Built
1910
115 years old, rebuilt 1935
Condition
Poor
inspected July 2023
Type
Truss - Thru
Steel
Length
68 ft
1 main span
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

405th Ave over Foster Creek is a steel truss - thru carrying 405th Ave over Foster Creek in Spink County, South Dakota. It was built in 1910 and reconstructed in 1935, so it is 115 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 50 by 2032. The structure is 68 ft (20.7 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries405th Ave
CrossesFoster Creek
Location1W & 3.2N Bloomfield
RouteCounty Highway 0
Coordinates44.6779, -98.11935
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, 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 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating3.4 US tons
Inventory rating3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1 (+2 approach)
Design loadUnknown
Structure length68 ft (20.7 m)
Longest span45 ft (13.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 by 2032
Trucks2%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.6 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 405th Ave over Foster Creek built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1935.

What condition is 405th Ave over Foster Creek 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 2023.

How much traffic does 405th Ave over Foster Creek carry?

About 50 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 405th Ave over Foster Creek?

The structure is 68 ft (20.7 m) long with a longest span of 45 ft (13.7 m) and a deck 24 ft wide.

Who owns 405th Ave over Foster Creek?

It is owned by the County Highway Agency.