The AA Barn is a reservable day-use group picnic site located directly adjacent to the Colorado River in the Arapaho National Recreation Area, offering access to hiking trails and Rocky Mountain National Park.

The historic barn features electricity, picnic tables, chairs, and an ADA-accessible vault toilet, with parking available on-site and a maximum capacity of 100 people per day.

Access is via a gated road from the Green Ridge Complex (County Road 66), and the site is open June 1 - September 30 during daylight hours with a $100 daily reservation fee.