Portal Campground is at the end of Lincoln Creek Rd by Grizzly Reservoir in White River National Forest. You can access Lincoln Creek Rd from Highway 82 (Independence Pass) it is about 10 miles out of Aspen. Once you get on Lincoln Creek Rd there is the Lincoln Gulch campground, which is fee camping. As you proceed up Lincoln Creek Rd there are about 20 free, dispersed campsites along the road. After around 6 miles on Lincoln Creek Rd, you will reach Grizzly Reservoir and the road will lead you into Portal Campground. There are only 5 sites in the campground. There are fire pits, picnic tables, and vault toilets. It is free to camp and the sites are not reservable so get there early. Four wheel drive and high clearance is recommended on Lincoln Creek Rd. I wouldn't say you need it; there were people driving Honda Civics up that road. You could make it in a car if you just go slow and the road is dry.

Portal campground is almost at 10,000 ft so it does get cold at night in the summer, but the views are worth it. The campground and reservoir are surrounded by snow capped mountains. There are a few day hikes from the campground. One of them is 7 mile Grizzly Lake Trail that leads to Grizzly Lake. The 4x4 trail also continues up from the campground if you want more off-roading. You're also near the popular cliff jumping site Devils Punch Bowl off Highway 85 that is a must do in late summer when the water is low. If you're not into jumping off cliffs you're also near the Grottos trail off Highway 85 which has ice caves. Overall, the campsite is beautiful, free, and near a lot of things to do!