8AM to Sunset.
Trione-Annadel State Park
Ledson Marsh Dam Repair in Progress!
CONSTRUCTION AREA – Please Use Caution
From 8/20/18 – 10/5/18, crews will be replacing the concrete spillway in the dam at Ledson Marsh, which has been undermined and no longer functions properly. Please do not enter the construction area.
Public Sign for the Ledson Marsh Dam Repair Project
The park, 60 miles north of San Francisco on the eastern edge of Santa Rosa offers miles of trails for hiking, mountain biking, and trail riding.
For wildflower lovers, Trione-Annadel State Park offers a great variety of flowers from early Spring until early Summer, especially on a hike around Lake Ilsanjo. The best months to see the park's wildflowers are April and May, but there are some plants in bloom as early as January and as late as September.
- Dogs are not allowed on trails. Dogs are allowed on a leash under your control only on Channel Drive (a paved road) within the park.
- Model Aircraft (“drones”)/Unmanned Aircraft Systems (UAS)/Glider Use is not allowed in the park per Bay Area District Order No. 660-16-036.
- Electric-Assist or “E-bikes” are considered motorized vehicles and are not allowed in the park.
Fishing Lake Ilsanjo offers excellent fishing for black bass and bluegill. Black bass weighing nine pounds and more have been caught here. A purple plastic worm is a favored bait for the bass, while the bluegill favor garden worms, small crayfish, and grubs. If you are 16 years of age or older, you must have a California fishing license. Ledson Marsh dries up by late August or early September and so no fish are found there.
Location - Directions
The park is east of Santa Rosa and south of Highway 12 on Channel Drive via Montgomery Drive. 6201 Channel Drive Santa Rosa, California, 95409
Latitude/Longitude: 38.4292 / -122.6236
Temperatures during the Summer are in the 80s and 90s. Wintertime highs are in the 50s.
Rainfall averages about 30 inches a year, most of it during the winter and early spring.
Snow is quite rare, and there is little fog.
Facilities and Activities
There is no camping in the park. Fires, campstoves, and barbecues are not allowed.
Campsites are available at the county campground at Spring Lake and at Sugarloaf Ridge State Park, about ten miles east of Annadel via Highway 12 and Adobe Canyon Road.
Horses and bicycles are allowed only on designated trails. Off-trail riding is not permitted.
Drinking water should be carried on the trails. The water in Hunter Springs is suitable for horses only.
Motor vehicles are allowed only on the entrance road and in the parking lot within the park.
Dogs are allowed only on Channel Drive and in the parking lot. They must be kept on leash at all times and are not allowed on the trails.
Lock your car and take your valuables with you. Don't Litter! If you bring it in, take it back out.
Available Activities and Facilities at Trione-Annadel State Park
Env. Learning/Visitor Center
Exhibits and Programs
Nature & Wildlife Viewing
Drinking Water Available