In November, 2009 a California Golden beaver family was caught in snares underwater and drowned in Griff Creek, a stream in King's Beach, California when Placer County Department of Public Works ordered their removal for fear that the beaver would cause flooding.
The early Spanish colonists referred to beaver as "nutria", perhaps because the Eurasian beaver had been extinct in Spain since the 17th century.
Juveniles have been found as far upstream as 12 km, e.g. in Ten Mile River, Mendocino County, and San Antonio Creek and the Santa Ynez River, Santa Barbara County, sometimes in sections of stream impounded by California Golden beavers (Castor canadensis subauratus) which provide ideal slow-moving water habitat for tidewater gobies.
Points of interest in the township include "Devils Tea-Table", a geological pillar formation on private land; the King Switch Tunnel, a timber tunnel on the Moonville Rail-Trail; a small natural bridge on Biddyville Road; and the county's largest beaver pond, also on Biddyville Road.
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North American beaver (Castor canadensis) have been thought to be non-native to San Luis Obispo Creek but Bolton recorded in "Anza's California Expeditions" that in April 1774, Father Cavaller of Mission San Luis Obispo de Tolosa gave Juan Bautista de Anza "thirty-odd beaver skins" along with other local gifts including fine Indian baskets and "the skins of eight bears, the animals for which the region was renowned".
Physician naturalist Edgar Alexander Mearns' 1907 report of beaver (Castor canadensis) on the Sonora River may be the southernmost extent of the range of this North American aquatic mammal.