Event Sold Out
Free Day Update as of 7/17/26 at 2:50pm
Parker Water & Sanitation District has confirmed that recent water quality testing found no harmful algal bloom at Rueter-Hess Reservoir.
The reservoir is open and operating as normal, including access for paddleboards, kayaks and other watercraft, and fishing.
Lone Tree’s Free Day at Rueter-Hess Reservoir will proceed as planned, and all reservations will be honored.
Residents who would still prefer to visit on another day may pick up a free general admission pass at the City of Lone Tree Municipal Building, 9220 Kimmer Drive, during regular business hours. Passes are valid for any day the reservoir is open.