Water Quality

Water quality within the Priest Rapids Project area supports domestic, industrial and agricultural water supply, stock watering, wildlife habitat, fish spawning, migration and rearing. Grant PUD currently operates and maintains four, fixed-site water quality stations within the Priest Rapids Project Area. These sites are located in the forebays and tailraces of Wanapum and Priest Rapids dams. A multi-probe water quality measuring device located at each station collects water temperature (Temp - Celsius - ° C), barometric pressure (mm/hg) and total dissolved gas (TDG - percent saturation) data on an hourly basis. Bi-weekly grab samples of turbidity, dissolved oxygen and pH are also collected from these sites.

Data collected from the four, fixed-site water quality stations is used to document the status of key water quality variables within the Priest Rapids Project area and to comply with Grant PUD’s 401 water quality certification.

Fish-Spill Season Total Dissolved Gas Summary Report - 2011 (pdf)

Water Quality Monitoring Report - 2010 (pdf)

Water Quality Monitoring Data

Quality Assurance Project Plan for Fixed Site Water Quality Monitoring Program (pdf)

Gas Abatement Plan - 2011 (pdf)

Section 401 Water Quality Certifications

Priest Rapids Hydropower Project 401 Water Quality Certification (pdf)

Aquatic Invasive Species