Columbia-Pacific Northwest Region

Data were collected from a string of temperature loggers from 1999-2017. The string was hung from a log boom approximately 2000 feet upstream of Grand Coulee Dam. Temperature data were collected at the following elevations (in feet): 5’, 15’, 30’, 45’, 60’, 75’, 90’, 120’, 150’, 180’, 240’, 270’, and 300’. Sensor elevations are referenced from water surface (0’) and NOT distance from the lake bottom; therefore, 240’, 270’ and 300’ readings may not be available at lower forebay surface elevations. Hourly forebay elevations are also included in the dataset.

Basic quality assurance has been performed to remove any anomalous readings such as temperature readings while loggers were outside of the waterbody; however, this data should be considered provisional. No guarantee is made for its accuracy.