Mercy Clinics has begun construction on a new family practice clinic in the Prairie Trail development in Ankeny. The new clinic, Mercy Prairie Trail Family Medicine Clinic, will be located at 2605 S.W. White Birch Drive and is expected to be complete next summer. The 10,600-square-foot clinic will be home to three family practice physicians with room to add additional doctors in the future. West Des Moines-based Ball Construction Services LLC is leading the construction project, and its sister company, Ladco Development Co., will own the building.