Lakes around Kenwood offer diverse natural landscapes and recreational opportunities within Sonoma County, California. The region is characterized by its rolling hills, oak woodlands, and proximity to state and regional parks. These areas provide a blend of serene natural settings and developed park amenities. Visitors can explore various lakes, many of which are man-made and integrated into extensive trail networks.
Last updated: June 24, 2026
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The Warren Richardson Trail is a gravel and dirt path that begins at the main entrance on the eastern side of the park. It ascends to the summit of the main ridge, then gently descends to the scenic Lake Ilsanjo, located near the park's center. It's one of the most scenic trails the park offers.
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This expansive 138-acre community park offers ample parking and restrooms and is a popular starting and ending point for local cyclists. There are plenty of outdoor activities, with the park boasting serene Lake Ralphine for fishing and boating, a softball field, tennis and pickleball courts, inviting picnic areas, and innovative playground structures. There is also a small amusement area with train rides for kids. It is a great gathering spot for families, with miles of trails to explore.
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Shallow lake with wide sandy beach next to Spring Lake, with food concessions, showers
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Lake Ilsanjo is a hidden gem in Annadel State Park: it's a small, quiet lake. There are many trails and even some swimming spots.
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Popular swimming lake with sandy beaches around the northern shore, with concession stands, picnic and restroom/shower facilities.
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Outdoor swimming better than any indoor pool: large lake with sandy beach, food and beverage vendors, life guards, restrooms, showers, drinking water fountains. Great for a civilized break and refreshing dip. The water is calm, though it can look a bit murky compared to neighboring Santa Rosa Creek Reservoir.
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Lake Ilsanjo is a hidden gem in Annadel State Park! There are lots of trails that take you up to the lake. It is also a great spot for a swim!
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Warren Richardson is an easy gravel road that takes you to the beautiful Lake Ilsanjo.
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The Kenwood area features a variety of lakes, including serene man-made lakes within state parks, and larger community park lakes. These offer diverse experiences, from tranquil natural settings to more developed recreational areas.
Yes, Lake Ilsanjo, located within Trione-Annadel State Park, is known for its quiet atmosphere and clean water, offering a peaceful escape. It's often described as a hidden gem for those seeking tranquility.
For swimming, the Santa Rosa Swimming Lagoon within Spring Lake Regional Park is a popular choice. It features sandy beaches and lifeguards during the summer months, along with concession stands and picnic areas.
Absolutely. Howarth Memorial Park, featuring Lake Ralphine, is an expansive community park with picnic areas, playground structures, and even train rides for kids. The Santa Rosa Swimming Lagoon is also very family-friendly with its beaches and amenities.
The lakes around Kenwood offer a wide range of activities. You can enjoy hiking, mountain biking, and horseback riding on the extensive trail networks, especially around Lake Ilsanjo. Fishing is popular at Lake Ilsanjo, Santa Rosa Creek Reservoir, and Lake Ralphine. Boating is available at Lake Ralphine and non-power boats at Santa Rosa Creek Reservoir. For more specific routes, explore the nearby cycling, MTB, and road cycling guides.
Yes, there are numerous hiking opportunities. Lake Ilsanjo is accessible via an extensive trail network within Annadel State Park, including the scenic Warren Richardson Trail. Spring Lake Regional Park, home to the Santa Rosa Creek Reservoir, also features paved hiking trails. You can find more detailed hiking routes in the MTB Trails around Kenwood guide, which often includes multi-use trails suitable for hiking.
Spring is a particularly good time to visit, especially around Lake Ilsanjo, to see vibrant wildflowers like golden poppies and lupines. The weather is generally pleasant for outdoor activities year-round, though summer offers the warmest swimming conditions.
Yes, fishing is a popular activity. Anglers can fish year-round at Lake Ilsanjo for bluegill and largemouth bass. The Santa Rosa Creek Reservoir is also a known fishing destination for largemouth bass, bluegill, and black crappie. Lake Ralphine in Howarth Memorial Park also permits fishing.
Yes, Howarth Memorial Park, which includes Lake Ralphine, is noted as dog-friendly, offering trails and open spaces for you and your pet to enjoy.
The areas around the lakes are rich in natural beauty. You'll find diverse terrain including oak woodlands, meadows, and volcanic hills, especially around Lake Ilsanjo. These environments provide opportunities for spotting wildlife such as black-tailed deer and various bird species. Many trails offer panoramic views of the lakes and the picturesque Sonoma County landscape.
Spring Lake Regional Park, home to the Santa Rosa Creek Reservoir, features paved hiking trails, which generally offer better accessibility. Howarth Memorial Park also provides ample parking and facilities, making it more accessible for visitors.
Visitors frequently praise the quiet atmosphere and clean waters of Lake Ilsanjo, often calling it a 'hidden gem' for swimming and relaxation. The extensive trail networks for hiking and biking, along with the family-friendly amenities and swimming opportunities at places like the Santa Rosa Swimming Lagoon and Howarth Memorial Park, are also highly valued.


Still not found your perfect lake around Kenwood? Check out the guides of these regions to see even more beautiful places.