US Bridges

State Park RD over French Ck

FairPosted for load

Custer County, South Dakota · 6.2E 3.5S Custer · Structure no. 000000017292105

Built
1950
75 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
3 main spans
Daily traffic
5
2022 count
Owner
State
Other State Agency

About this bridge

State Park RD over French Ck is a steel stringer/multi-beam or girder carrying State Park RD over French Ck in Custer County, South Dakota. It was built in 1950, so it is 75 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. Its operating status is: posted for load restriction.

It carries about 5 vehicles a day, roughly 2% of them trucks, projected to reach 5 by 2032. The structure is 66 ft (20 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesState Park RD
CrossesFrench Ck
Location6.2E 3.5S Custer
RouteState Lands Road 0
CountyCuster County
StateSouth Dakota
Coordinates43.71619, -103.47517
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
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.
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 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating17 US tons
Inventory rating13 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans3
Design loadUnknown
Structure length66 ft (20 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2022)
Projected traffic5 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

OwnerOther State Agency
Maintained byOther State Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$100,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was State Park RD over French Ck built?

It was built in 1950, making it 75 years old in 2025.

What condition is State Park RD over French 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 October 2024.

How much traffic does State Park RD over French Ck carry?

About 5 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is State Park RD over French Ck?

The structure is 66 ft (20 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns State Park RD over French Ck?

It is owned by the Other State Agency.