Trione-Annadel State Park

Last updated
Trione-Annadel State Park
Lupines AnnadelStateParkCA.jpg
Lupines in a meadow, Annadel State Park
Relief map of California.png
Red pog.svg
Usa edcp relief location map.png
Red pog.svg
Location Sonoma County, California, United States
Nearest city Kenwood, California; Santa Rosa, California
Coordinates 38°25′45″N122°37′30″W / 38.42917°N 122.62500°W / 38.42917; -122.62500 Coordinates: 38°25′45″N122°37′30″W / 38.42917°N 122.62500°W / 38.42917; -122.62500
Area5,092 acres (2,061 ha)
Governing body California Department of Parks and Recreation

Trione-Annadel State Park is a state park of California in the United States. It is situated at the northern edge of Sonoma Valley and is adjacent to Spring Lake Regional Park in Santa Rosa. It offers many recreational activities within its 5,092-acre (2,061 ha) property.


The rock formations of Trione-Annadel have played a central role in its history: its volcanic origins, the Native American use of obsidian, the early 1900s mining of cobblestones, and modern hikers' appreciation of its volcanic rock outcrops.

These lands were occupied by the Wappo and Pomo people in prehistoric times, who would have primarily inhabited the riparian zones and the marsh perimeter. Annadel includes what some biologists consider the best example of undisturbed northern oak woodlands in existence. [1] Visitors can enjoy the park's diverse wildlife and scenery during any time of the year but are perhaps most rewarded from April through June when most wildflowers are in bloom.

The park has gone through two Wildfires in its history, the 2017 Nuns fire that burned the majority of the park and the most recent Glass fire in 2020.


View from southern mountain flanks of Annadel looking toward Sonoma Mountain. Annadelviewofsonomamtn.jpg
View from southern mountain flanks of Annadel looking toward Sonoma Mountain.

Plant communities include California oak woodland, riparian woodland, Douglas fir forest, chaparral, grassland, and marsh. The dominant plant community is the oak woodland, which has a canopy of coast live oak, Garry oak, black oak, Pacific madrone, bigleaf maple, and California laurel. Canyon live oak occurs in swales and creeks. In the oak woodlands, the dominant understory plants are native bunchgrasses, toyon, wild blackberry, coyote brush, and western poison-oak. The latter covers nearly one quarter of the understory in the park. [2] Douglas fir occurs in some of the steeper, cooler riparian zones and on north-facing slopes.

Common animals in Annadel include black-tailed deer, western gray squirrel, raccoon, skunk, and opossum. Bobcat and mountain lion are occasionally observed. There are many bird species, including the California scrub jay, Steller's jay, acorn woodpecker, black phoebe, and dark-eyed junco. In moist areas, amphibians such as the rough-skinned newt can be found.

Hydrology and geology

Ledson Marsh within Annadel Annadelledsonmarsh.jpg
Ledson Marsh within Annadel

The southern reaches of Annadel are drained by Yulupa Creek and other tributaries of Sonoma Creek, while the northern flanks are part of the Santa Rosa Creek watershed. [3] Eastern slopes are drained by Yulupa and Sonoma Creeks, while the western slopes are part of the Spring Creek watershed. Many of Annadel's streams are dry in the summer, because rainfall is highly seasonal, with most of the approximately 30 inches (76 cm) of annual precipitation occurring between October and April. [1] Ledson Marsh, which drains into Yulupa Creek, retains some smaller pools of water throughout most of the year. The highest elevation in the park is the top of Bennett Mountain, 1,887 feet (575 m).

The entirety of Annadel was below the ocean floor as recently as twelve million years ago, around which time massive uplift and volcanic action formed the massif which comprises the park of today. Elevations in Annadel range from about 360 to 1,880 feet (110 to 570 m) above sea level. [1] Slopes within Annadel commonly range from 15 to 30 percent, but it is not uncommon to encounter slopes up to 70 percent on steep slopes above drainages which are covered in douglas fir forest. One of the major soil associations within the park is Goulding cobbly clay loam, which contains roughly 25 percent cobblestones with some basaltic exposures, evidence of the volcanic origins of the Sonoma Mountains. [4] Typical soil depths are 35 to 50 centimetres (14 to 20 in). Much of the soil type in the Yulupa Creek riparian zone consists of Laniger loam, with rhyolite outcrops, another relic of the igneous history.


Manzanita of 12-inch (30 cm) diameter, Annadel State Park Annadelmanzanita.jpg
Manzanita of 12-inch (30 cm) diameter, Annadel State Park

The Southern Pomo and Southern Wappo peoples inhabited these lands in prehistoric times. No full-scale villages have been discovered within the park boundaries. This site was valuable to the Native American tribes as a source of obsidian, which they used to make scrapers, knives, arrowheads, and spearheads. Archaeological evidence suggests they used the area as a quarry at least as far back as 3000 years. [5] Human use and settlement of this area changed markedly in the late 18th century when the Spanish came to this region. Cattle ranching and farming gradually replaced the prehistoric tribal hunting and gathering.

In 1837, Annadel was part of the Rancho Los Guilicos Mexican land grant. In 1848 the lands of Annadel were purchased by Scottish immigrant William Hood, for whom nearby Hood Mountain was named. In the late 19th century, sheep and cattle grazing was superseded by quarry uses. There was considerable demand for cobblestone material when many west coast cities were being developed, and especially in the reconstruction of San Francisco after the 1906 San Francisco earthquake. Cobblestone quarry operations were a major source of revenue to the Wymores and the Hutchinsons who were the principal land owners in this area around the year 1900. The park derives its name from Annie Hutchinson, since this locale was once termed "Annie's Dell". [1] In the early 1900s, author Jack London settled nearby in these same Sonoma Mountains, and he based much of his writings on these mountains that he loved. [6]

Demand for cobblestone subsided around the year 1920, since owners of the newly invented automobile expected a smoother ride than that derived from cobblestone streets. Joe Coney began to accumulate land holdings in this area during the 1930s. He used the land for agricultural purposes until the late 1960s, though he also mined perlite, an obsidian product used in the manufacture of certain insulation products. Annadel became part of the California State Park system in the year 1971.

The site of what became Trione-Annadel was being eyed for residential development when Henry Trione and hunting buddy Joe Long of Long's Drugs put together a $5 million package that led ultimately to the site's protection as a park. [7] Trione built his home on the hillside adjacent to Annadel. In 2012, he pitched in another $100,000 to keep the park running under county administration at a time when Annadel and dozens of other parks statewide were threatened with closure because of a budget crisis. It was due to these philanthropic efforts that the State of California ruled in July 2016 to officially change the name to Trione-Annadel State Park.

Practical issues

The main park access is from the north via the city of Santa Rosa. An important secondary access is from the Lawndale Road trailhead in Kenwood, which access is the shortest route to Ledson Marsh. There are 35 miles (56 km) of trails for running, hiking, mountain biking, and trail riding. [1] In addition, excellent black bass and bluegill fishing can be found at the park's largest body of water, Lake Ilsanjo. Dogs are not allowed in the park. There is no potable water available in the park.

Closure proposal

Annadel was of 70 California state parks scheduled to close in 2012 by California Governor Jerry Brown. The County of Sonoma took on park operations as a temporary measure to keep it open. [8]

See also

Related Research Articles

Wine Country Area of Northern California known as a wine-growing region

Wine Country is the region of California, in the northern Bay Area, known worldwide as a premier wine-growing region. The region is famed for its wineries, its cuisine, Michelin star restaurants, boutique hotels, luxury resorts, historic architecture, and culture. Viticulture and wine-making have been practiced in the region since the Spanish missionaries from Mission San Francisco Solano established the first vineyards in 1812.

Sonoma Valley

Sonoma Valley is a valley located in southeastern Sonoma County, California, in the North Bay region of the San Francisco Bay Area. Known as the birthplace of the California wine industry, the valley is home to some of the earliest vineyards and wineries in the state, some of which survived the phylloxera epidemic of the 1870s and the impact of prohibition in the early 20th century. Today, the valley's wines are protected by the U.S. Federal Government's Sonoma Valley and Carneros AVAs.

Sonoma Creek Stream in California

Sonoma Creek is a 33.4-mile-long (53.8 km) stream in northern California. It is one of two principal drainages of southern Sonoma County, California, with headwaters rising in the rugged hills of Sugarloaf Ridge State Park and discharging to San Pablo Bay, the northern arm of San Francisco Bay. The watershed drained by Sonoma Creek is roughly equivalent to the wine region of Sonoma Valley, an area of about 170 square miles (440 km2). The State of California has designated the Sonoma Creek watershed as a “Critical Coastal Water Resource”. To the east of this generally rectangular watershed is the Napa River watershed, and to the west are the Petaluma River and Tolay Creek watersheds.

California oak woodland

California oak woodland is a plant community found throughout the California chaparral and woodlands ecoregion of California in the United States and northwestern Baja California in Mexico. Oak woodland is widespread at lower elevations in coastal California; in interior valleys of the Coast Ranges, Transverse Ranges and Peninsular Ranges; and in a ring around the California Central Valley grasslands. The dominant trees are oaks, interspersed with other broadleaf and coniferous trees, with an understory of grasses, herbs, geophytes, and California native plants.

Mount Hood (California)

Mount Hood, also known as Hood Mountain is a mountain near the southeastern edge of Santa Rosa, California at the northeast of the Sonoma Valley and attains a height of 2,733 feet (833 m). The original name was Mount Wilikos, an Indian name meaning "willows." Most of the drainage from Mount Hood contributes to the headwaters of Sonoma Creek. A prominent feature is the extensive rock face visible on the upper half of the mountain as viewed from State Route 12. The habitats on the mountain include mixed oak forest, pygmy forest, chaparral and riparian zones. In prehistoric times the slopes of Mount Hood were inhabited by a division of the Yuki tribe. Most of Mount Hood is within the Hood Mountain Regional Park maintained by Sonoma County. Mount Hood is part of the inner coast Mayacamas Range, and lies mostly within Sonoma County, with a part of the mountain geographically within Napa County. Mount Hood affords overlooks of the Pacific Ocean, San Francisco Bay and "a spectacular view east to the Sierra Nevada Range."

Sonoma Mountain

Sonoma Mountain is a prominent landform within the Sonoma Mountains of southern Sonoma County, California. At elevation of 2,463 ft (751 m), Sonoma Mountain offers expansive views of the Pacific Ocean to the west and the Sonoma Valley to the east. In fact, the viticultural area extends in isolated patches up the eastern slopes of Sonoma Mountain to almost 1,700 feet (520 m) in elevation.

Santa Rosa Creek

Santa Rosa Creek is a 22-mile-long (35 km) stream in Sonoma County, California, which rises on Hood Mountain and discharges to the Laguna de Santa Rosa by way of the Santa Rosa Flood Control Channel. This article covers both the creek and the channel.

Brush Creek (Sonoma County, California)

Brush Creek or Rincon Creek is a tributary of Santa Rosa Creek in Sonoma County, California. Brush Creek rises in the southern slopes of the Mayacamas Mountains within Sonoma County. The lower reach of the creek is a suburban medium density residential area in the city of Santa Rosa, and that reach of Brush Creek has been restored during the 1990s under a U.S. Environmental Protection Agency grant to promote steelhead migration and spawning. Further restoration and incorporation into citywide park planning is currently underway as of 2006. The location of the confluence with Santa Rosa Creek is particularly noteworthy, since it was a locus of prehistoric life as a village of the Pomo people and a scenic geologic feature of massive flat boulder outcrops within the stream channel.

Fairfield Osborn Preserve

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, amphibians, reptiles and insects.

Copeland Creek (California)

Copeland Creek is a 9.0-mile-long (14.5 km) perennial stream that rises on Sonoma Mountain in Sonoma County, California.

Laguna de Santa Rosa

The Laguna de Santa Rosa is a 22-mile-long (35 km) wetland complex that drains a 254-square-mile (660 km2) watershed encompassing most of the Santa Rosa Plain in Sonoma County, California, United States.

Sonoma Mountains

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.

Yulupa Creek

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.

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.

Calabazas Creek (Sonoma County)

Calabazas Creek is a 5.5-mile-long (8.9 km) stream in the Sonoma Valley, California, United States, that rises in the southern Mayacamas Mountains and empties into Sonoma Creek near Glen Ellen.

Lake Ilsanjo

Lake Ilsanjo is a man-made lake located in Annadel State Park east of Santa Rosa in Sonoma County, California, United States. It is a place for fishing and swimming, especially in the summer months. Entrepreneur Joe Coney originally owned the land that is now Annadel State Park and named the lake after his wife Ilsa and himself. Thus it came to be called Lake Ilsanjo. It drains into Spring Creek.

Ledson Marsh

Ledson Marsh is a 30-acre (0.1 km2) freshwater marsh in Annadel State Park east of Santa Rosa in Sonoma County, California, United States. Located on the east flank of Bennett Mountain, it drains into Schultz Creek, a tributary of Yulupa Creek.

Pepperwood Preserve is a 3,117-acre plot of land owned by the Pepperwood Foundation, located in the Mayacamas Mountains in the coast ranges of California near the towns of Santa Rosa and Healdsburg in Sonoma County. The preserve includes the headwaters of Mark West Creek, Franz Creek, and Brooks Creek all of which feed into the Russian River. The highest point on the preserve is 1,560 feet.

Galbreath Wildlands Preserve

The Galbreath Wildlands Preserve is a 3,670-acre (14.9 km2) nature reserve in Mendocino County, California, USA, established in 2004 in honor of Fred Burckhalter Galbreath (1901-2000). The preserve, a former sheep ranch, is located in the Outer Coast Range 17 miles from the coast, near Yorkville. The Preserve features woodland, forest and grassland communities that lie at the edge of coastal fog influence. Lands are in the upper Rancheria sub-basin of the Navarro Watershed and contain 1st - 5th order streams. The Preserve's forests are primarily second-growth coniferous forest and hardwood.

Los Guillicos Preserve

The 40-acre Los Guillicos Preserve lies in the Valley of the Moon at the foot of Hood Mountain in the Mayacamas Mountain Range. Oak woodlands of the Preserve are within the Sonoma Creek Watershed. This land was included in the 1837 Rancho Los Guilicos Mexican Land Grant. Since 2011, the Preserve has been managed by Sonoma State University's Center for Environmental Inquiry.


  1. 1 2 3 4 5 Annadel State Park facts
  2. Hogan, C. M. (2008). Western poison-oak: Toxicodendron diversilobum. Archived July 21, 2009, at the Wayback Machine In: Strömberg, N. (ed.) GlobalTwitcher.
  3. Santa Rosa Quadrangle, Fifteen minute series, USGS Quadrangle Map, U.S. Government Printing Office, Washington DC (1958)
  4. Soil Survey, Sonoma County, California, U.S. Department of Agriculture, Soil Conservation Service, Government Printing Office, Washington DC, May 1972
  5. Krumbein, B. Annadel State Park: The First Twenty Years. 1st ed. Desktop Publishing. 1993. pg 96-97.
  6. Stienstra, T. and M. Hodgson. California Hiking, 1996-96 edition. Foghorn Press. 1995. ISBN   0-935701-93-1
  7. "Santa Rosa power broker, philanthropist Henry Trione dies at 94". Press Democrat. Retrieved 2019-05-07.
  8. Asimov, N. State parks director resigns amid surplus scandal. San Francisco Chronicle. July 20, 2012.