Our work at the dam continues, although its been made a lot more challenging given the 9.2" of rain we received over the weekend. This morning, we installed another 10" siphon to lower the water, and we are still losing ground. Keep in mind, last week, an 8" siphon was able to drop the water level one foot, in as little as one hour! Once we are able to get the water below the dam level, we'll be able to proceed with the valve replacement.
