A massive canal 80 feet (24 m) wide and 6 feet (1.8 m) deep was also dug through the Caloosahatchee River; when the lake rose too high, the excess water left through the canal to the Gulf of Mexico. Exotic trees were planted along the north shore levee: Australian pines, Australian oaks, willows, and bamboo.[12] More than $20 million was spent on the entire project. Sugarcane production soared after the dike and canal were built. The populations of the small towns surrounding the lake jumped from 3,000 to 9,000 after World War II.[65]