I know that there are a lot of people in Utah right now who are pretty bummed about the toxic algae bloom that is currently affecting Utah Lake, the Jordan River, and some canals in the area. Here is a wonderful alternative! Millsite State Park is a very clean (looking) reservoir with a boat ramp and swimming area. There is a campground with pavilions, and many activities to be had, including fishing (offering rainbow and cutthroat trout), boating, bike riding, ATVing, and endless hiking in the nearby Ferron Canyon. A public 9-hole golf course is adjacent to the park as well.
In my opinion, Millsite State Park is one of Utah’s best kept secrets. I was there on a holiday, and there were maybe like 7 people there, tops. The Millsite Reservoir is part of the Ferron Watershed Project, a water containment area that was created in 1970. You can walk all the way across the breakaway to an incredible hike full of interesting rock formations, desert plants, and wildlife. The elevation at the park is 6,100 feet, and it is full of incredible views and panoramas. This spot is the perfect day trip or weekend getaway.