US Bridges

38830 279 ST over Andes Ck

Fair

Douglas County, South Dakota · 1.5N 3.7W of Armour · Structure no. 000000022143110

Built
1940
85 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
10
2022 count
Owner
County
County Highway Agency

About this bridge

38830 279 ST over Andes Ck is a prestressed concrete tee beam carrying 38830 279 ST over Andes Ck in Douglas County, South Dakota. It was built in 1940, so it is 85 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.

It carries about 10 vehicles a day, roughly 2% of them trucks, projected to reach 10 by 2032. The structure is 40 ft (12.2 m) long and 19 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Carries38830 279 ST
CrossesAndes Ck
Location1.5N 3.7W of Armour
RouteCounty Highway 0
Coordinates43.34109, -98.41654
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width19 ft (5.9 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2022)
Projected traffic10 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 38830 279 ST over Andes Ck built?

It was built in 1940, making it 85 years old in 2025.

What condition is 38830 279 ST over Andes 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 July 2023.

How much traffic does 38830 279 ST over Andes Ck carry?

About 10 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 38830 279 ST over Andes Ck?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 19 ft wide.

Who owns 38830 279 ST over Andes Ck?

It is owned by the County Highway Agency.