US Bridges

4th Avenue SW over Big Sioux River

Fair

Codington County, South Dakota · 0.3E of 10th Street SW · Structure no. 000000015181175

Built
1977
48 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
144 ft
5 main spans
Daily traffic
1,831
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

4th Avenue SW over Big Sioux River is a concrete continuous slab carrying 4th Avenue SW over Big Sioux River in Codington 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 6 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 1,831 vehicles a day, roughly 1% of them trucks, projected to reach 1,831 by 2032. The structure is 144 ft (43.9 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries4th Avenue SW
CrossesBig Sioux River
Location0.3E of 10th Street SW
RouteCity Street 0
CountyCodington County
StateSouth Dakota
Coordinates44.8974, -97.12582
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.5 US tons
Inventory rating27.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length144 ft (43.9 m)
Longest span32 ft (9.8 m)
Deck width49 ft (14.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,831 (2022)
Projected traffic1,831 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$2.2 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 4th Avenue SW over Big Sioux River built?

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

What condition is 4th Avenue SW over Big Sioux River 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 2023.

How much traffic does 4th Avenue SW over Big Sioux River carry?

About 1,831 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is 4th Avenue SW over Big Sioux River?

The structure is 144 ft (43.9 m) long with a longest span of 32 ft (9.8 m) and a deck 49 ft wide.

Who owns 4th Avenue SW over Big Sioux River?

It is owned by the City or Municipal Highway Agency.