We rely on a variety of data sources to evaluate the state's current and future water supply. Explore some of these sources here.
See a collection of maps that show June and July water supply conditions from 2014 to 2018.
Rivers and streams are an important part of the state's water supply. These online tools track flow levels.
Mountain snow acts like a water supply reservoir as it slowly melts during spring and summer.
Rain, lowland snow, and other precipitation are important contributors to water supply.
Groundwater, water held in aquifers, is critical to the water cycle.
We use these data sources to look for the first signs of drought.
Short- and long-range climate forecasts allow us to better understand potential impacts to the state's water supply.
The Yakima River basin is an important agricultural center for the state. Many farmers there depend on water from federally managed reservoirs.