The U.S. Army Corps of Engineers has issued statements addressing issues they are currently having with those at Tuttle Creek Lake. 
“The outlet tubes are still open for visitors who want to observe the high water release. The Country Stampede parking services will issue short term parking passes for visitors to park in the Shelter #3 lot and walk down to the outlet tubes. If visitors should walk in to the Stampede event, they are subject to towing per Country Stampedes towing regulations.
There have also been reports of Stampede campers staying overnight in Outlet Park. This is prohibited by Title 36 regulations. If campers are found in the Outlet Park area, they are subject to towing per Country Stampede regulations and ticketing from the US Army Corps of Engineers. If you arrive after hours you will need to find other accommodations until the morning.”
Everyone is also advised to stay out of the water at the lake.