City of Spearfish, SD
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HYDRO PLANT

Constructed by Homestake Mining Company to provide power for the mine site in Lead SD. and power for the Homestake Sawmill in Spearfish SD. which provided timber for various mining methods.

The Spearfish Hydro system was purchased by the City of Spearfish in 2004 from Homestake Mining Company to maintain water flow through the city and downstream users.

The diversion tunnel from Maurice intake to Forbay totals 5 miles in length. Mining was completed in one year with 14 headings working towards each other without any errors in elevations or horizontal mismatch. It is constructed of five feet high concrete side walls and a poured floor. The roof consists of either poured concrete, arched concrete blocks, or nature arched rock.

Hydro Plant

Spearfish Hydro Plant constructed in 1910

Maurice Intake
Diversion Tunnel

Maurice Intake

Diversion Tunnel

Stand Pipes are located on a ridge south of Spearfish and above the mouth of Spearfish Canyon. The Stand Pipes reduce the water shock within the pipelines feeding the plant, as the water flows change the height of the Stand Pipes changes.

Sand Pipes
Generators

Stand Pipes

Hydro Plant is equipped with two 2 megawatt generators

THE HYDRO PLANT TODAY:

Hydro Plant Hydro Plant
Hydro Plant Hydro Plant

 

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