Catasauqua Creek is an ENE–SSW oriented creek draining 6.6 miles (10.6 km) (straight line distance) from springs of the Blue Mountain barrier ridge several miles below the Lehigh Gap in the ridge-and-valley Appalachians located upriver and opposite from Allentown in Lehigh and Northampton counties in the Lehigh Valley region of eastern Pennsylvania. — Ann Bartholomew & Lance E. Metz, page 5, DELAWARE and LEHIGH CANALS Catasauqua Creek is a left bank tributary entering from the East shore of the historic Lehigh River/Canal and is often known as "Catty Creek".