Just south of Guerneville Road, the Santa Rosa Flood Control Channel enters the Laguna, bring water from Santa Rosa Creek and its tributaries. The Laguna continues north, emptying into Mark West Creek amidst the wetlands east of Forestville.
South of Guerneville Road, the Santa Rosa Flood Control Channel connects to the Laguna, carrying water from Santa Rosa Creek and its tributaries. The Laguna flows northward, eventually merging with Mark West Creek in the wetlands east of Forestville.