The Midpeninsula Regional Open Space District (MROSD) manages numerous water bodies (ponds and lakes) throughout the District – throughout San Mateo and Santa Clara Counties. Water impounded in these lakes and ponds is fully adjudicated, however the volume of water in several water bodies is unknown. MROSD requested Balance Hydrologics (Balance) to install staff plates on several water bodies within the District in to obtain information regarding current water levels. Through discussions with MROSD staff, Balance expanded the scope of work to include bathymetric surveys of two ponds and a volume calculation based on a bathymetric map of a third pond. Balance installed staff plates on three water bodies: Mud Lake, Upper/Front Lake, and Lower Lake. Bathymetric surveys were completed with a total station and a boat-mounted, GPS-enabled Acoustic Doppler Current Profiler (ADCP) on Upper Lake and Lower Lake. Additionally, Balance staff integrated ground survey by others to complete a topographic map and volume estimate for Upper/Front Lake. To augment ground survey and ADCP survey data, recent LiDAR data was also incorporated to the site mapping. Stage-volume calculations were completed utilizing the survey data from the Lakes, survey data by others, and the LiDAR data. Results were provided to the MROSD in both digital and hardcopy format.