This dataset presents summaries of the minimum and maximum discharge at gaging stations on the Colorado River and tributaries. Data were collected from USGS for each gaging station, and summarized into seasonal averages. The averages are for the period of record of each gage up to 9/30/2010; the period of record varies widely across the gaging stations. Data were summarized in the associated spreadsheet: Vector\Attributes\Aquatic\Documentation\SOD_selected_gaging_station_data.xlsx for each gaging station. The average minima and maxima values were attached to a copy of the gaging stations point dataset to create this dataset.