From Devils Lake District Manager Paul Robertson
It seems like a simple concept, but there was a lot of loud misinformation and misunderstanding at our last meeting about a proposal the DLWID has been considering for improving the function of the dam. So, let us explain:
The summer dam at the lake’s outlet to the D river has a permanent concrete base, the top of which is 8.03 feet above mean sea level. Between June and October, boards are placed in brackets on top of the base to create the dam in order to raise the lake level above its natural level. During the winter, after the boards have been removed, the concrete base slows the flow of water at the outlet to the D river. The slowed velocity reduces the ability of the water to carry sediment (mostly sand) out of the Lake. As a result, sand has accumulated behind the base over the years. This accumulation of sand obstructs the flow of water and slows the flushing of the lake between October and June even though, again, the dam is not installed during these months.
The investigation and reports of two professional hydrologists have confirmed these observations (see pages 11 and 12 of the Manager’s Report for the April 2015 meeting of the Board). As a result, the Board is considering removing the concrete base and damming the lake between June and October with materials that can be removed for the winter months. Removal of the concrete base should promote faster flow to the D River in the winter months, better flushing of harmful algae and unwanted nutrients, and less flooding in low-lying areas around the lake during the wintertime.
The board is moving forward with the long process of obtaining permits while continuing to investigate and receive further information on this proposal.
“Know Your Lake” articles 1 through 9 can be found by searching the web for “Devils Lake Water Improvement District” or visiting our website at www.DLWID.org.
THANKS FOR SUPPORTING
A HEALTHY DEVILS LAKE!
THE DEVILS LAKE WATER IMPROVEMENT DISTRICT
P.O. Box 974, Lincoln City, OR 97367