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 5.8 3.0 - 9.4 19.4 4.7
February 5.7 3.1 - 8.4 17.9 5.3
March 3.7 1.7 - 6.4 16.5 2.6
April 2.6 1.0 - 4.4 11.4 1.9
May 2.0 0.9 - 3.2 6.4 1.8
June 2.4 1.2 - 3.6 16.4 2.1
July 3.1 1.9 - 4.2 24.0 2.0
August 3.8 2.4 - 5.0 19.8 2.9
September 4.1 2.6 - 5.5 16.4 3.7
October 4.6 2.6 - 6.8 14.8 4.0
November 5.8 3.9 - 7.7 15.4 5.2
December 5.6 3.2 - 8.0 14.2 5.3
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.