<P> Corsicana is located at 32 ° 5 ′ 33" N 96 ° 28 ′ 10" W ﻿ / ﻿ 32.09250 ° N 96.46944 ° W ﻿ / 32.09250; - 96.46944 (32.092480, − 96.469407). </P> <P> According to the United States Census Bureau, the city has a total area of 21.7 square miles (56 km), of which 20.7 square miles (54 km) is land and 1.0 square mile (2.6 km) is water . </P> <P> Corsicana is home to the Lake Halbert dam and recreational park, and is less than fifteen miles (24 km) from Richland Chambers Reservoir, with recreational fishing, public boat ramps, and 330 miles (530 km) of treed and green shorelines . Richland Chambers Reservoir is the third - largest lake by surface area and the eighth - largest reservoir by water volume in Texas . </P> <P> Corsicana has a moderate humid subtropical climate . The range of low - high average temperatures in January, April, July, and October is 34 / 55, 53 / 75, 73 / 95, and 55 / 79 degrees Fahrenheit . </P>

Where does corsicana tx water source come from