Annie - I frequently camp in the area and found this campground on the Web. I camped there in May 2002.
Campground Review
Even though this is a Forest Service campground near Rocky Mountain National Park, it is quiet and for the most part not crowded. We were there on Memorial Day weekend and were only one of three campers that were in the sites near the water on the north side of the campground. In fact, we were the only campers there on Memorial day itself. The water in the lake is way down this year and probably will be for a few years to come, if there isn't considerable rain and snowfall this year and next. It is still a great place to camp. Reservations can be made online at ReserveUSA.