The department has requested DOTD’s assistance to close the Lake Bistineau water control gates on Wednesday, July 14, 2010. Fisheries staff are beginning to observe giant salvinia accumulating in some areas of the lake and agreed that it’s time to initiate some water fluctuation and attempt to strand plants. Of course, present water levels need to rise in order to initiate this method. Opening the gates in the future will depend on rain events and plant accumulations.
It will not necessarily be our goal to allow the lake level to rise to pool stage in order to initiate water fluctuation. We plant to alert the public a week in advance of either opening or closing the gates.
While the lake has been down, fisheries staff have been evaluating salvinia re-emergence and assessing the lake bed. Aspects of the plan remain incomplete pending the completion of this work. Central to our efforts include a lake bed contour map and identifying areas for “dirt work” and tree removal. Some of this work is best completed while the lake is down. Allowing the lake to rise at this point is not expected to complicate these efforts.
Spray crews have treated some salvinia accumulations with herbicide spray applications. As the lake level rises, our crews will have easier access to shallow areas and our efforts will increase.
In addition, some areas have been designated to evaluate SONAR treatments. These treatments, similar to Galleon treatments, require that water volume remain constant for several weeks to obtain desirable results. Applications are expected in July.
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