Water Tracker


Welcome to Water Tracker—an automated system that provides up-to-date and accurate data on surface water distributions in the Central Valley. This information is useful for water and wetland managers when making decisions about water management.
Download the most recent (and historic) data here!


The Central Valley is a nexus for water resources in California. Despite the importance of water resources in this region, data on open surface water have not been available until now.
Explore data summaries here! Explore maps here!


This innovative water tracking system helps water, wetland, and conservation program managers know in near real-time how to allocate limited freshwater resources to meet the needs of wildlife and people.
See Data in Action here.

Surface Water Probability