The United States Geological Survey (USGS) operates five stream gauges along the Rogue River. They are located, from uppermost to lowermost, near Prospect,[11] Eagle Point,[12] Central Point,[13] Grants Pass,[14] and Agness. Between 1960 and 2007, the average discharge recorded by the Agness gauge at river mile (RM) 29.7 or river kilometer (RK) 47.8 was 6,622 cubic feet per second (188 m3/s). The maximum discharge during this period was 290,000 cubic feet per second (8,200 m3/s) on December 23, 1964, and the minimum discharge was 608 cubic feet per second (17 m3/s) on July 9 and 10, 1968. This was from a drainage basin of 3,939 square miles (10,202 km2), or about 76 percent of the entire Rogue watershed.[6] The maximum flow occurred between December 1964 and January 1965 during the Christmas flood of 1964, which was rated by the National Weather Service as one of Oregon's top 10 weather events of the 20th century.
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