Lawndale and Lake Ilsanjo Loop

The Lawndale Trail, which is part of this loop, begins at the eastern end of Trione-Annadel State Park off Lawndale Road. There are parking areas available at various trailheads within the park, including the main Spring Lake Regional Park entrance (which connects to Annadel) or the Lawndale Road access point. Always check signage for specific parking regulations and fees.

No, dogs are generally not permitted on the dirt trails within Trione-Annadel State Park, including sections of this loop. They are only allowed on paved roads and in developed areas like picnic spots. Please respect park regulations to protect wildlife and natural habitats. For more details, you can check the official Trione-Annadel State Park website.

Spring is an excellent time to visit, as wildflowers like golden poppy, iris, lupine, and buttercups are in bloom, especially around Lake Ilsanjo. Fall also offers pleasant temperatures and changing foliage. Summers can be hot, particularly on exposed sections like the Rough-Go Trail, so an early start is recommended if hiking during warmer months.

Trione-Annadel State Park typically requires a day-use fee for vehicle entry. This fee helps maintain the park's facilities and trails. You can usually pay at the entrance kiosk or via self-pay stations. No specific hiking permits are generally required for day use on the trails themselves. Check the official California State Parks website for current fee information.

The loop features diverse terrain, including natural dirt paths, gravel sections, and unpaved areas. You'll traverse northern oak woodlands, forests of Douglas-fir and redwood, grasslands, and chaparral. Expect rolling hills and some volcanic rock formations. Some sections, like the Rough-Go Trail, are steep and rough, while others, like Steve's "S" Trail, are steep but shaded.

A major highlight is Lake Ilsanjo, a tranquil 26-acre man-made lake. As you gain elevation, you'll be rewarded with panoramic views of the lake, the city of Santa Rosa, the coastal mountain range, and the picturesque Sonoma County landscape, including the Mayacamas Mountains. The Ridge Trail section offers some of the best vistas.

Yes, the route also passes through sections of the Bay Area Ridge Trail - 01 - North Bay, the Ridge Trail, South Burma, Marsh Trail, and the Lawndale Trail. This network allows for various extensions or alternative routes within Trione-Annadel State Park.

Hikers often spot black-tailed deer and various bird species. Coyotes are common, especially around sunset. Keep an eye out for threatened California red-legged frogs near Ledson Marsh, where the Marsh Trail terminates. Be aware of potential hazards like rattlesnakes, mountain lions, and ticks, and always give wildlife ample space.

While Lake Ilsanjo is a central feature, it's primarily for recreation like fishing and swimming, not a potable water source. Restrooms and picnic tables are available near the lake. It's always best to carry sufficient water for your entire hike, especially given the length and difficulty of this loop.

Given the trail's length and difficulty, bring plenty of water, snacks, and appropriate footwear for varied terrain. Sun protection (hat, sunscreen) is crucial, especially on exposed sections. A map or GPS device is recommended due to the extensive trail network. Consider trekking poles for steep descents, and always carry a first-aid kit.

The full Lawndale and Lake Ilsanjo Loop, as described, is a challenging 20.8 km (12.9 miles) hike with significant elevation gain, estimated to take around 5 hours and 55 minutes. However, there are shorter, moderate options around Lake Ilsanjo that can be completed in 2-3 hours if you're looking for a less strenuous experience.