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17 October 2011
Here is some interesting information the LCRA recently released regarding Lake Travis lake levels. According to the latest projections we should not see much change in the lake levels if the drought continues. One main factor is that several local municipalities have water intakes nearing the water’s surface which will require the LCRA to send additional water down from Lake Buchannan in order to maintain an elevation sufficient for these water districts to be able to pump water to their customers. Lake elevations are currently 628.79 feet above sea level http://www.lcra.org/water/conditions/lake.html. Lake levels should level off around this elevation according to the projections below.
The graph below illustrates the historical changes in water elevation on the Highland Lakes since 1940. The Highland Lakes have had major fluctuations in volume since the dam system has been in place. http://www.lcra.org/library/media/public/docs/water/wmp/July_1_Content.pdf
Here are some interesting facts about the Travis elevation taken directly from the LCRA.org website:
Below are the top 5 lowest elevations recorded since the reservoirs have been in use:
August 1951 614' (2 months later the lake was at 677')
November 1963 615' (2 years later it was 680')
October 2009 630' (6 months later it was 680')
October 1984 636' (5 months later it was at 680')
October 2000 640' (1 month later it was at 675')
December 2006 643' (3 months later it was at 675')
The biggest swing in a short time was 63' in 2 MONTHS.