At this time, I have one standing and 2 former sites but some sources claim that there was a total of 4 sites and that the Civilian Conservation Corps (CCC) had built them all.
WillhiteWeb.com
Rocky Mountain National Park Lookouts
Shadow Mountain
One Standing Lookout
Twin Sisters Peak
Longs Peak
2 Former Lookouts
Meadow Mountain
Unknown near Thompson River (likely Mt. Dickinson)
Panoramic Sites
These were likely considered sites or sites that were used during high fire danger or just observation points occasionally used. I have not been able to view the panoramic images yet. If you know where they are online, please contact me.
Trail Ridge
Fall River
Mount Dickinson
Fairview Curve
Many Parks Curve
Rainbow Curve
Mount Dickinson (East Point)
Twin Sisters #2
Shadow Mountain Lookout
Twin Sisters Peak Lookout