US Bridges

Old Ft Thompson RD over Soldier Creek

Fair

Buffalo County, South Dakota · 1 Mi. So. of Ft. Thompson · Structure no. CEPMROSD0000018

Built
1973
52 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
113 ft
2 main spans
Daily traffic
50
2018 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Old Ft Thompson RD over Soldier Creek is a steel continuous stringer/multi-beam or girder carrying Old Ft Thompson RD over Soldier Creek in Buffalo County, South Dakota. It was built in 1973, so it is 52 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 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 75 by 2039. The structure is 113 ft (34.5 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesOld Ft Thompson RD
CrossesSoldier Creek
Location1 Mi. So. of Ft. Thompson
RouteFederal Lands Road 0
CountyBuffalo County
StateSouth Dakota
Coordinates44.05809, -99.44548
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length113 ft (34.5 m)
Longest span55 ft (16.7 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2018)
Projected traffic75 by 2039
Trucks5%
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

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Old Ft Thompson RD over Soldier Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Old Ft Thompson RD over Soldier 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 September 2023.

How much traffic does Old Ft Thompson RD over Soldier Creek carry?

About 50 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Old Ft Thompson RD over Soldier Creek?

The structure is 113 ft (34.5 m) long with a longest span of 55 ft (16.7 m) and a deck 33 ft wide.

Who owns Old Ft Thompson RD over Soldier Creek?

It is owned by the Corps of Engineers (Civil).