US Bridges

27180 369th Avenue over Platte Creek

PoorPosted for load

Charles Mix County, South Dakota · 4.2N & 2.0E of Platte · Structure no. 000000012250038

Built
1940
85 years old, rebuilt 1972
Condition
Poor
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
48
2022 count
Owner
County
County Highway Agency

About this bridge

27180 369th Avenue over Platte Creek is a steel stringer/multi-beam or girder carrying 27180 369th Avenue over Platte Creek in Charles Mix County, South Dakota. It was built in 1940 and reconstructed in 1972, 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 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 48 vehicles a day, roughly 2% of them trucks, projected to reach 48 by 2032. The structure is 40 ft (12.2 m) long and 21 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries27180 369th Avenue
CrossesPlatte Creek
Location4.2N & 2.0E of Platte
Coordinates43.44467, -98.80592
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment8: Equal to present desirable criteria
Operating rating27 US tons
Inventory rating20.3 US tons

Structure

MaterialSteel
DeckOpen grating
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width21 ft (6.4 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48 (2022)
Projected traffic48 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$624,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 27180 369th Avenue over Platte Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1972.

What condition is 27180 369th Avenue over Platte 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 October 2023.

How much traffic does 27180 369th Avenue over Platte Creek carry?

About 48 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 27180 369th Avenue over Platte Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 21 ft wide.

Who owns 27180 369th Avenue over Platte Creek?

It is owned by the County Highway Agency.