US Bridges

27040 371st Avenue over Platte Creek

Fair

Charles Mix County, South Dakota · 5.6N & 4.0E of Platte · Structure no. 000000012270024

Built
1968
57 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Concrete
Length
50 ft
2 main spans
Daily traffic
95
2022 count
Owner
County
County Highway Agency

About this bridge

27040 371st Avenue over Platte Creek is a concrete channel beam carrying 27040 371st Avenue over Platte Creek in Charles Mix County, South Dakota. It was built in 1968, so it is 57 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 95 vehicles a day, roughly 2% of them trucks, projected to reach 95 by 2032. The structure is 50 ft (15.2 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries27040 371st Avenue
CrossesPlatte Creek
Location5.6N & 4.0E of Platte
Coordinates43.46589, -98.7661
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection7 GoodSome minor problems.
Last inspectionOctober 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 geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadUnknown
Structure length50 ft (15.2 m)
Longest span25 ft (7.6 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95 (2022)
Projected traffic95 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 27040 371st Avenue over Platte Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is 27040 371st Avenue over Platte Creek 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 October 2023.

How much traffic does 27040 371st Avenue over Platte Creek carry?

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

How long is 27040 371st Avenue over Platte Creek?

The structure is 50 ft (15.2 m) long with a longest span of 25 ft (7.6 m) and a deck 32 ft wide.

Who owns 27040 371st Avenue over Platte Creek?

It is owned by the County Highway Agency.