Flow Rate
The United States Geological Survey operates a stream gauge on the Blue Earth River below Rapidan Dam in Rapidan Township, downstream of the mouth of the Watonwan River and upstream of the mouth of the Le Sueur River, and 12 miles (19 km) upstream from the river's mouth. The annual mean flow of the river at the gauge between 1909 and 2005 was 1,076 cubic feet per second (30 m³/s). The highest recorded flow during the period was 43,100 ft³/s (1,220 m³/s) on April 9, 1965. The lowest recorded flow was 6.9 ft³/s (0.2 m³/s) on October 12, 1955.
Read more about this topic: Blue Earth River
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