about 73000 acre of farmland in an area that receives less than 4.5 inch of annual precipitation.

The dam is not designed for water storage. It is a low 31 ft high concrete structure that diverts water from the Truckee River into the Truckee Canal and then two main project canals, the Southside Main Canal ("V" Line) and the Northside Main Canal ("T" Line). It was listed on the National Register of Historic Places in 1978 as the "Derby Diversion Dam."

Environmental impact

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