We rented a boat on lake dillon fom 3pm to 7pm, a commercial plane flew overhead, we looked up at the plane and we noticed a white sphere floating overhead underneath the light cloud cover. we dimissed it as being a ballon as it had no strings or tethers, it was a perfect sphere, glossy white, it never moved position with the wind or breeze. i recorded a video of the object but when i tried to watch it the video wasn`t on the memory card. i was able to snap a photo on my phone but the photo is of poor quality as cell phone lenses suck. it just looks like a white fuzzy blob in the photo. we observed it for almost 2 hrs when clouds moved in the object dissapeared after the clouds dissipated it was gone.