75% completed plans January 10th, 2023
To All Members,
The Dam Committee and Board have approved going for Option 4 of Kathryn's (CT Male's) four options with modifications (4A see plans below). This option seemed to be the best to provide us with a water level somewhat near our previous historical level (summertime boards). Note, this is the option which has 5 culverts. The bottoms (inverts) of four of them are 6" higher than the fifth culvert invert. We requested a modification to Option 4 to increase the water level of our lake to closer to what it had historically been based on the boards used in the past. Her original Option 4 would basically leave the water level at its current level - at the bottom of the present dam inverts, but with a transient level 6" higher until the water level comes down to the lowest culvert. Kathryn agreed to review the impact of raising the height of the bottom of all Option 4 culverts by 6 inches. This would have the effect of potentially raising the water level to about 12" above current low levels after a big rain for a relatively short time. The level would then decrease to the lower culvert level which is 6" above current levels. It should be noted that measurements of the “waterline” around the lake on exposed cliffs, rocks and the face of the dam seem to demonstrate that our previous water level was from 8 to 12” higher than present. It is expected that these low water levels in addition to putting stumps everywhere, have also contributed to the demise of previous floating bogs in certain areas of the lake. The possibility of putting a small "V" in the lower culvert to keep a minimal flow going might be in the next design phase.
Kathryn submitted Option 4A to us on October 13 which addressed our comments. The Dam Committee and Board have reviewed the Option 4A and have provided a few comments which appear to be more applicable after the next phase of project development. We have had a few more questions on bridge width, construction, wing walls, which she says would be part of reviewing the 75% design phase. For information, we have completed the 35% design phase and are now in the 75% design phase which according to her original proposal letter “includes complete design of the new dam, wing walls, downstream slope armoring, energy dissipation, flashboards or gates (if chosen), re-grading, etc. 75% level plans are sufficient to develop a cost estimate for the project but are not considered construction-level plans.”
Roy Keats, Chair Dam Committee