Historical High Rock Lake Water Levels

(Measured at High Rock Dam)

The following chart indicates what typical lake levels have been each month, based on historical data from 1986-present.

Month Average Feet Below Full1 Range Of Average Highest To Average Lowest Feet Below Full2 Lowest Feet Below Full3 Median Feet Below Full4
January 6.1 3.2 - 9.8 19.4 5.6
February 5.9 3.2 - 8.7 17.9 5.5
March 3.8 1.7 - 6.5 16.5 2.8
April 2.6 1.0 - 4.5 11.4 1.8
May 2.0 0.9 - 3.2 6.4 1.8
June 2.4 1.2 - 3.6 16.4 2.0
July 3.1 1.9 - 4.2 24.0 1.9
August 3.9 2.5 - 5.1 19.8 3.0
September 4.1 2.6 - 5.5 16.4 3.7
October 4.6 2.7 - 6.7 10.9 4.1
November 5.8 4.0 - 7.7 13.4 5.3
December 5.7 3.2 - 8.4 14.2 5.4
1 This is the average of daily water level readings for each month.
2 This is the range of the average of the highest daily water level readings and the lowest daily water level readings for each month.
3 The maximum drawdowns generally occurred in drought years.
4 One half of the daily water level readings are above this figure and one half were below this figure for each month.