Actually I found a great website for the Lake Levels.
http://www.lakepowellfun.com/water.html Looks like Castle rock still has at least 13 feet or more to go.
SITE/LAUNCH NAME -Castle Rock Cut-Off
MINIMUM SAFE ELEVATION - 3620.00
ABSOLUTE MINIMUM USABLE ELEVATION - 3612.00
CURRENT LEVEL VS. ABSOLUTE MINIMUM - 12.49 Below