Sonoma Mountain

Petaluma Reservoir is a small, man-made lake located about 5 miles (8 km) northeast of Petaluma in Sonoma County, California, United States. Also known as Lawler Reservoir, its waters are impounded by Lawler Dam, a rock fill dam 40 feet (12 m) high and 1,150 feet (350 m) long that was built in 1910. The City of Petaluma owns the reservoir.In 1992, the State of California declared the reservoir unsafe in the event of an earthquake. Rather than perform a seismic retrofit of the dam, the City decided to stop using it for water supply.

The Fairfield Osborn Preserve is a 450-acre nature reserve situated on the northwest flank of Sonoma Mountain in Sonoma County, California. There are eight plant communities within the property, oak woodland being the dominant type. Other communities include chaparral, Douglas fir woodland, native Bunch grass, freshwater marsh, vernal pool, pond and riparian woodland. The flora is extremely diverse including many native trees, shrubs, wildflowers, grasses, lichens and mosses. A diverse fauna inhabits this area including black-tailed deer, coyote, bobcat and an occasional mountain lion; moreover, there are abundant avifauna (including some neotropical migrants), amphibians, reptiles and insects. Copeland Creek and its tributaries drain the Preserve as they wend their way down steep ravines toward eventual discharge to the Laguna de Santa Rosa. The property was originally a Spanish Land Grant holding, devolving to private ownership and eventually given to The Nature Conservancy; the preserve is now owned and managed by Sonoma State University as a research and education site. An understated natural trail system weaves through the property to provide access to creek canyons, ridges and marshy areas. The preserve is situated at elevations 1,350 to 2,300 feet (411 to 701 meters) above sea level and features a landscape riddled with basalt exposures that betray the volcanic prehistory of Sonoma County. The climate at the Preserve is mild, with most rainfall occurring in the winter months and with some influence of the Pacific Ocean providing moderating temperatures and some marine fog on early summer mornings.

The Sonoma Mountains are a northwest–southeast trending mountain range of the Inner Coast Ranges in the California Coast Ranges System, located in Sonoma County, Northern California.

The Sonoma Mountain AVA is an American Viticultural Area in Sonoma County, California, United States. It is centered on the Sonoma Mountain landform in the Sonoma Mountains. The appellation includes the town of Glen Ellen, California and is nearly surrounded by the Sonoma Valley AVA. The area is known for the diverse micro-climates that occur on exposed hillsides and shaded drainages, and as such is home to production for a wide range of varieties including Cabernet Sauvignon, Chardonnay, Pinot noir, Sauvignon blanc, Semillon, and Zinfandel.

Wolf House was a 26-room mansion in Glen Ellen, California, built by novelist Jack London and his wife Charmian London. The house burned on August 22, 1913, shortly before the Londons were planning to move in. Stone ruins of the never-occupied home still stand, and are part of Jack London State Historic Park, which has been a National Historic Landmark since 1963.

Jack London State Historic Park, also known as Jack London Home and Ranch, is a California State Historic Park near Glen Ellen, California, United States, situated on the eastern slope of Sonoma Mountain. It includes the ruins of a house burned a few months before Jack London and family were to move in, a cottage in which they had lived, another house built later, and the graves of Jack London and his wife. The property is both a California Historical Landmark and a National Historic Landmark. The Jack London home, called the Wolf House, is a sizable stone structure, which was destroyed by fire and whose ruins are visible within the state park property. The sloping terrain of the park has a considerable occurrence of Goulding clay loam soils, particularly in the lower reaches.

Sonoma Mountain Zen Center (or, Genjoji) is a Soto Zen practice center located on 80 acres (30 ha) in the mountainous region of Sonoma County in California—near Santa Rosa—carrying on the tradition and lineage of Shunryu Suzuki. Founded by Jakusho Kwong and his wife Laura Kwong in 1973, Kwong-roshi is the current guiding teacher of the Zen center. Offering residential training, Saturday Community and group retreats. Sonoma Mountain Zen Center also offers a practice regimen for members of the surrounding area and elsewhere who are not residents.

Graham Creek is a 2.9-mile-long (4.7 km) perennial stream in Sonoma County, California, tributary to Sonoma Creek. Graham Creek rises in the northern Sonoma Mountains and flows generally northeasterly down the northeastern flank of Sonoma Mountain. Historically this watercourse was called Wild Water Creek, a name used in the time of author Jack London, some of whose work was inspired by the stream. Steelhead, Oncorhynchus mykiss, have historically entered Graham Creek via Sonoma Creek for spawning. Stream surveys conducted from 1966 to 1986 indicated significant, but declining populations of anadromous fish. The spawning habitat of Graham Creek is considered medium to high value, with both winter and summer sheltering characteristics.Land uses in the watershed are primarily open space, agriculture and low density residential uses; waste disposal within the watershed contains no municipal collection system and consists totally of septic and lagoon treatment. Most of the watershed is covered with native California oak woodland habitat populated with a variety of riparian and upland flora and fauna. Historical grazing that began in the 19th century caused certain ecological damage, some of which has been reversed by the present time.

Yulupa Creek is a 2.8-mile-long (4.5 km) southeast-flowing perennial stream that rises on the southeastern flanks of the northern Sonoma Mountains in Sonoma County, California, United States. This creek, which drains the eastern slopes of Bennett Mountain, is tributary to Sonoma Creek, which in turn discharges to San Pablo Bay. Yulupa Avenue in Santa Rosa is presumably named after this creek.

Glen Ellen is a census-designated place (CDP) in Sonoma Valley, Sonoma County, California, United States. The population was 784 at the 2010 census, down from 992 at the 2000 census. Glen Ellen is the location of Jack London State Historic Park (including the Wolf House), Sonoma Valley Regional Park, and a former home of Hunter S. Thompson. The whole of Glen Ellen was severely damaged by the Nuns Fire during the October 2017 Northern California wildfires.

The Sonoma Developmental Center (SDC) was a large state school in California, United States for people with developmental disabilities, and is located in Eldridge in Sonoma County. Former names for this hospital include California Home for the Care and Training of Feeble Minded Children (1883); Sonoma State Home (1909); Sonoma State Hospital (1953); and Sonoma Developmental Center starting in 1986. The center closed on 31 December 2018.

The Arnold Drive Bridge (also called the Jim Berkland Memorial Bridge and the Sonoma Creek Bridge) is a historic truss bridge in Eldridge, California in the United States. The bridge was built in 1930 over Sonoma Creek. The bridge serves as a connecting point between Eldridge and the village of Glen Ellen. In 1998, the bridge was named a historic bridge by the Sonoma League for Historic Preservation and was named a historic landmark by the County of Sonoma.