Events at Lake Sonoma Ironman Santa Rosa -- July 28, 2018 The second of two Ironman Santa Rosa triathalons will start in the wee hours of the morning on Saturday, July 28, at Lake Sonoma. Competitors will swim across the lake before mounting their bicycles for the intense ride/run to Santa Rosa. Expect increased traffic at the lake on Friday, July 27, as athletes unload bicycles, and again early on Saturday as they embark on their journey south. Projections are that all of the participants should be out of the park by 10 a.m. on Saturday. Lake Sonoma Steelhead Run Tours From January through April, guided tours for school children and other groups are available weekdays by appointment. Self-guided tours are available every day. The fish hatchery sorts fish daily and does its artificial spawning on Thursday mornings. To watch the magnificent steelhead push their way up Dry Creek to the fish ladder to spawn the next generation of fish, come out to the park or call 707-431-4533 to make an appointment for a guided group tour! Tours are free. Lake Sonoma Steelhead Festival -- February 9, 2019 This great free event will be held Saturday, February 9, 2019, at the Milt Brandt Visitors Center. Festivities begin at 10 a.m. and run until 4 p.m. This event is hosted by the Friends of Lake Sonoma, the U.S. Army Corps of Engineers, the Sonoma County Water Agency and the California Department of Fish and Wildlife. For more information, please refer to the Lake Sonoma Steelhead Festival Page under "Support Lake Sonoma" on this website. Want to hold an event at Lake Sonoma? Lake Sonoma is the perfect venue for all kinds of events, ranging from family reunions to mountain bike racing. Fees for venue rental are set by the U.S. Army Corps of Engineers, but if you're planning an event, you can designate the Friends of Lake Sonoma as an event sponsor and your fees will then be a donation -- with all funds returned directly to the park in support of programs and maintenance. To hold an event, contact the USACE at 707-431-4590 and mention to the park ranger that you would like to partner with the Friends of Lake Sonoma. It's as simple as that!