Colorado /
Lake John
Reservoir in Colorado · 785 acres · near Fort Boettcher, Walden
Lake John has 2 boat ramps listed as public.
Past algal blooms
Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2026.
state reports compiled by U.S. EPA · checked October 18, 2026
Boating rules
- Gas motors allowed · all of Lake John rule
From the boating rules map of Colorado Parks and Wildlife, read October 18, 2026. A map of rules is a guide: the regulation's text and the posted signs govern.
Launches
- Lake John Boat Launch near Fort Boettcher · Boat ramp · near Fort Boettcher
- Lake John Boat Launch near Walden · Boat ramp · near Walden
Community
Where people who fish, boat and paddle Lake John talk about it. Lake associations, clubs and local groups will be added as we find them.