From email from Reclamation (Kara Lamb):
As more run-off comes down from the mountains above Estes, more of the east slope water rights come into play for the Colorado-Big Thompson Project. We call the east slope water rights “priority” water. As we continue to curtail our imports from the west slope accordingly, we are pulling more priority water into the C-BT system.
Changes to the system will be made late tonight [June 7 or] Wednesday morning around 2 a.m. We will cut back some additional C-BT water imported through the Adams Tunnel and collect a matching amount of priority water here on the east slope. As a result, the Olympus Dam release to the lower Big Thompson River will be cut back from around 905 cfs to about 780 cfs.
More Colorado-Big Thompson Project coverage here.