Onion Creek Metropolitan Park is a 517-acre regional park located in Southeast Travis County. The park is divided into north and south sections which are connected through the 250-acre Onion Creek Greenbelt which primarily lies on the north side of Onion Creek. The southern section of Onion Creek was purchased by the City of Austin in the late 1990’s while the northern section, which is part of the Lower Onion Creek Flood Buyout, was added in 2019. The Metro Park is mostly undeveloped but does contain nature and groomed trails, pavilions, restroom and open play fields. The adjacent greenbelt contains additional nature trails, an off-leash area, playground, picnic areas and creek crossing.