From email from Reclamation (Kara Lamb):
We are in the process of filling both Horsetooth and Carter Lake. Currently, Horsetooth is roughly 80% full at an elevation of 5414 feet above sea level. This is its average water elevation high mark for the beginning of the summer season in a typical year. But, this is not a typical water year and Horsetooth’s water elevation is projected to continue going up.
Similarly, Carter Lake is 90% full at a water level elevation of about 5749 feet. Like Horsetooth, it is projected to continue filling. At this time, we are anticipating Carter will fill, hitting its highest water level elevation for the season by mid-May. Horsetooth will likely hit its highest water level elevation for the season by late June.