The Trexler Nature Preserve is an 1,108-acre county park owned and maintained by Lehigh County in the Lehigh Valley region of Pennsylvania. The preserve is situated in Lowhill Township and North Whitehall Township and the land that comprises the preserve was originally purchased between 1901 and 1911 by local industrialist General Harr…The Trexler Nature Preserve is an 1,108-acre county park owned and maintained by Lehigh County in the Lehigh Valley region of Pennsylvania. The preserve is situated in Lowhill Township and North Whitehall Township and the land that comprises the preserve was originally purchased between 1901 and 1911 by local industrialist General Harry Clay Trexler.