I used to wakeboard in a lake in central Illinois that was a cooling lake for a local power station (Clinton Lake, Illinois). Obviously boating and skiing was allowed there, so it must've been deemed safe. It was effectively a heated lake, which was great because you could ski way later/earlier in the season compared to other waterways in the region. As you got closer to where the waste water fed into the lake, you could definitely feel it get warmer. On colder days it would also get foggier around that area. Water temps could be around 80 F while the air temp would be 60 F or even 50 F.<br><br>So to answer the question in the video title: yes, and it was really cool (in a figurative, not literal sense).