Question: what is the deepest part of the st johns river

title: St. Johns River
text: The St. Johns River is under consideration as an additional water source to meet growing public water needs . In 2008 , the river 's Water Management District undertook a Water Supply Impact Study of the proposed water withdrawals and asked the National Research Council to review science aspects of the study as it progressed . This resulted in a series of four reports that assessed the impact of water withdrawal on river level and flow , reviewed potential impacts on wetland ecosystems , and presented overall perspectives on the Water Management District study . The National Research Council found that , overall , the District performed a competent job in relating predicted environmental responses , including their magnitude and general degree of uncertainty , to the proposed range of water withdrawals . However , the report noted that the District 's final report should acknowledge such critical issues as include future sea - level rises , population growth , and urban development . Although the District predicted that changes in water management would increase water levels and flows that exceed the proposed surface water withdrawals , these predictions have high uncertainties .