Dear Cheese,
Thank you for these links.
I have found the following, among other sources:
BBM
http://www.eatstayplay.com/html/co/a2198p306c2053.html
which notes that:
Vallecito Reservoir is a scenic, high mountain reservoir built in 1941 and has 2,700 surface acres of water and 22.0 miles of shoreline.
The mountain lake is approximately 167 feet deep at the dam and is at an elevation of 7,665 feet. It is a cold water lake with fishing and boating being the main activities.
As well as this:
http://4cornershikesdol.blogspot.com/2011/08/vallecito-lake-walk-path.html
which says:
There is a small parking area with a restroom and the Walk Path is clearly marked. The top of the dam elevation is about 7673 feet.
The normal depth of water is 121.5 feet.
(BTW, for anyone interested, the second link has some good lake photos.)
Hopefully, these explain my interest in your sources. I'll check back for the other links tomorrow.
Thanks again.