I think it is because Dillion is Denver's drinking water and they don't like the idea of your body stewing in it. You can pump your boat's bilge out and they are ok with that though.Matty for 10 Mile Kayak in Frisco told me that SUP boards are banned from Lake Dillon as well. It seamed like the perfect spot, but not as far as the law is concerned.
Every river runner should read that book "We Swam the Grand Canyon" Awesome story!You should be able to swim that shit if you want to. People swam the entire Grand Canyon. After some discussion, the rangers let them continue and they made it alive.
Adventure on public lands should be allowed and safety education should be encouraged.
"You can tell how corrupt a society is by the number of laws it has." -Mr. Abbey