 When local students reach sixth grade in Hillsborough County, they take a visit to the river for one to three days to learn about the ecosystem, watershed, and native Florida animals at a place called 'Natures Classroom'.The Hillsborough River dam (originally built in 1895 and since rebuilt) at Rowlett Park allows for the supply water for the City of Tampa.SWFWMD and Tampa Bay Water erroneously refer to the river immediately above the dam as "a reservoir", when in reality, it is still the Hillsborough River.