Lawler, also known as Petaluma Reservoir, is a crucial water resource in Sonoma, California, owned and regulated by the local government. This Earth type dam, completed in 1910, stands at a height of 40 feet and has a hydraulic height of 34.5 feet. The reservoir has a capacity of 227 acre-feet and serves the primary purpose of water supply for the surrounding area.

Located in Petaluma and fed by North Creek, Lawler plays a vital role in supplying water to the region. Despite its low hazard potential and satisfactory condition assessment, the dam is regularly inspected and maintained by the Department of Water Resources, Safety of Dams. With a drainage area of 0.5 square miles and a surface area of 10 acres, Lawler remains a critical piece of infrastructure for water supply in the area.

Lawler's history dates back over a century, and its continued operation underscores its importance in managing water resources in California. With its low-risk profile and reliable water storage capacity, Lawler stands as a testament to effective water management practices and serves as a valuable asset for the local community in Petaluma.