US Bridges

State Park RD over Stockade Lk Spillway

Fair

Custer County, South Dakota · 4.2E of Custer · Structure no. 000000017272072

Built
1988
37 years old
Condition
Fair
inspected October 2024
Type
Girder and Floorbeam System
Wood or Timber
Length
73 ft
3 main spans
Daily traffic
50
2022 count
Owner
State
Other State Agency

About this bridge

State Park RD over Stockade Lk Spillway is a wood or timber girder and floorbeam system carrying State Park RD over Stockade Lk Spillway in Custer County, South Dakota. It was built in 1988, so it is 37 years old, younger 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 2% of them trucks, projected to reach 50 by 2042. The structure is 73 ft (22.3 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesState Park RD
CrossesStockade Lk Spillway
Location4.2E of Custer
RouteState Lands Road 0
Coordinates43.76491, -103.51437
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating37 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length73 ft (22.3 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 by 2042
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$5,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was State Park RD over Stockade Lk Spillway built?

It was built in 1988, making it 37 years old in 2025.

What condition is State Park RD over Stockade Lk Spillway 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 Stockade Lk Spillway carry?

About 50 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is State Park RD over Stockade Lk Spillway?

The structure is 73 ft (22.3 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns State Park RD over Stockade Lk Spillway?

It is owned by the Other State Agency.