Lower Snake-Tucannon

Watershed Hydrology

The Lower Snake Tucannon Watershed (HUC 17060107) covers approximately 1,224 square miles in southeastern Washington State. The area is characterized by steep, rugged terrain with elevations ranging from 650 to 6,000 feet above sea level. The watershed is fed by the snowmelt from the Blue Mountains, which results in a significant flow of surface water in the spring and early summer months. The Tucannon River is the primary surface water source, and it is supplemented by several reservoirs, including the Little Goose Reservoir and Lower Granite Reservoir. The area experiences a semi-arid climate, with precipitation averaging around 12 inches per year. In recent years, the area has experienced a trend of declining snowpack, which has led to lower water availability for agricultural and recreational purposes. The region is also prone to wildfires, which have become more frequent and severe with climate change.


Surface Flows

Lower Snake-Tucannon Watershed

Snowpack Depths

Lower Snake-Tucannon Watershed

Dams & Reservoirs

Lower Snake-Tucannon Watershed

Groundwater Levels

Lower Snake-Tucannon Watershed

Lower Snake-Tucannon Rivers

Rivers of the Watershed