US Bridges

Sd Route 87 over Wash

Fair

Custer County, South Dakota · On Sd Route 87 MP 46.3; · Structure no. 1560002P0000000

Built
1956
69 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
326
2022 count
Owner
Federal
National Park Service

About this bridge

Sd Route 87 over Wash is a concrete continuous culvert carrying Sd Route 87 over Wash in Custer County, South Dakota. It was built in 1956, so it is 69 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 326 vehicles a day, roughly 2% of them trucks, projected to reach 391 by 2042. The structure is 21 ft (6.3 m) long. If it were closed, the detour would be 41 mi (66 km).

Location

Open in Google Maps
CarriesSd Route 87
CrossesWash
LocationOn Sd Route 87 MP 46.3;
RouteFederal Lands Road 31087
CountyCuster County
StateSouth Dakota
Coordinates43.63647, -103.47902
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.1 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic326 (2022)
Projected traffic391 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed41 mi (66 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sd Route 87 over Wash built?

It was built in 1956, making it 69 years old in 2025.

What condition is Sd Route 87 over Wash 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 January 2024.

How much traffic does Sd Route 87 over Wash carry?

About 326 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Sd Route 87 over Wash?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns Sd Route 87 over Wash?

It is owned by the National Park Service.