Since 2019 Sonoma County Parks and the Graton Rancheria have co-managed Tolay Lake Regional Park outside Petaluma. That interim agreement has been cemented for the next 20 years. Tucked away at the end of a quiet lane off Lakeville Highway sits Tolay Lake. Though reduced from its original size after settlers in the 1850’s dynamited the natural levee at the lake’s southern end to clear part of the shallow lake for agricultural use, Tolay’s cultural significance to the Indians of the Graton Rancheria remains. … The origins of the co-management agreement stretch back to the county’s 2005 acquisition of Cardoza Ranch, the property built upon Tolay. Melanie Parker with Sonoma County Parks explained co-management of the 3400-acre property…