Historic Sites and Points of Interest in Nevada County
Calanan Park is an open air museum containing devices which were used to mine gold.
A marker for The Monitor reads:The first hydraulic mining originated on American Hill near Nevada City, California in 1853. This miners giant known as The Monitor washed hillsides away under high pressure uncovering gold bearing gravel beds. This mining technique flourished profitably until 1884 when the Sawyer decision closed hydraulic mining. Rivers were being filled with mud debris causing flooding of the rich farmlands below.
Placed November 11, 1965
By Hydraulic Parlor No. 56
Native Sons of the Golden West