The St. Johns River is the longest river in the U.S. state of Florida and is the most significant one for commercial and recreational use. At 310 miles long, it flows north and winds through or borders 12 counties. The drop in elevation from headwaters to mouth is less than 30 feet ; like most Florida waterways, the St. Johns has a very slow flow speed of 0.3 mph, an…The St. Johns River is the longest river in the U.S. state of Florida and is the most significant one for commercial and recreational use. At 310 miles long, it flows north and winds through or borders 12 counties. The drop in elevation from headwaters to mouth is less than 30 feet ; like most Florida waterways, the St. Johns has a very slow flow speed of 0.3 mph, and is often described as "lazy".
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