|Location||Sonoma County, California|
|Primary inflows||Piner Creek|
|Primary outflows||Piner Creek|
|Catchment area||0.52 sq mi (1.3 km2)|
|Basin countries||United States|
|Surface area||33 acres (130,000 m2)|
|Water volume||427 acre⋅ft (527,000 m3)|
|Surface elevation||495 ft (151 m)|
Fountaingrove Lake is a reservoir in the city of Santa Rosa, California, United States. Formed by the Fountaingrove Dam, the lake is fed from the east by Piner Creek, which is also the lake's sole outlet.
Fountaingrove Dam is an earthen dam built in 1953. It is 38 ft (12 m) high, 500 ft (150 m) long, and 15 ft (5 m) wide.
The dam and half the lake is owned by the city of Santa Rosa as the Nagasawa Community Park.
Within the lake at its verges are significant densities of wetland plants; moreover, at upland locations there are many native trees, particularly Coast live oak, Quercus agrifolia and Garry oak, Quercus garryana. Fishing has historically been conducted within the lake, although golf course and other urban development around the perimeter has reduced these practices.
The microclimate at Fountaingrove Lake is a mild Mediterranean climate typical of southern and central Sonoma County. Approximately 29.2 inches (74.2 cm) of precipitation occur at Fountaingrove Lake annually, almost entirely in the form of rainfall. The record high and low temperatures for this locale are 110 °F (43 °C) and 16 °F (-9 °C) respectively. Air quality is generally good since prevailing winds are from the northwest and intercept little industry as the winds travel from the Pacific Ocean. Sound levels have increased steadily with the growth of Santa Rosa, with the principal local sound source being Fountaingrove Parkway; sound levels from vehicles ascending the steep grades of that arterial can attain levels of 55 to 58 dBA at the environs of Fountaingrove Lake.
A 500,000 US gal (1,900 kl) water storage tank was proposed near the southern end of Fountaingrove Lake; the city of Santa Rosa has approved this project to add to the municipal drinking water supply, subject to erosion control measures to protect Fountaingrove Lake from excessive siltation. A substantial retirement community known as Varenna is under development as of 2007 on the ridgetop at the southeastern perimeter of Fountaingrove Lake. The Varenna project had not made wetlands mitigation environmental filings in a timely manner with the California Regional Water Quality Control Board regarding certain filling of perimeter wetlands of Fountaingrove Lake associated with its development project; therefore, additionally off-site mitigation was required of the project to compensate the people of California for the wetlands destruction at Fountaingrove Lake. On site mitigation measures include extensive erosion protection for cut slopes and installation of bioswales.
- U.S. Geological Survey Geographic Names Information System: Fountaingrove Lake
- "Dams Within the Jurisdiction of the State of California" (PDF). Retrieved 2008-01-03.
- Fountaingrove Lake, Sonoma County, California Archived 2007-09-27 at the Wayback Machine
- Santa Rosa Quadrangle, Fifteen minute series, USGS Quadrangle Map, U.S. Government Printing Office, Washington DC (1958)
- The Fountaingrove Club Course History
- "City of Santa Rosa Creeks Master Plan" (PDF). Archived from the original (PDF) on 2007-09-26. (1.00 MiB)
- "Species of Special Concern". Sacramento Fish and Wildlife Office, U.S. Fish and Wildlife Service. Retrieved 2007-03-09.
- Sonoma county Bass Fishing Club
- Historic meteorological data for Santa Rosa, California
- Panzar, Sonali Kohli, Paige St John, Javier. "Santa Rosa under siege as huge fire carves path of destruction". latimes.com. Retrieved 2018-02-25.
- Minutes of Santa Rosa City Council Meeting October 10, 2000 Archived September 26, 2007, at the Wayback Machine