Blue Spring State Park Orange City FL is the largest spring on the St. Johns River and discharges an average of 165 million gallons per day. The spring pool is circular, with a notable boil in the center and steep sandy banks that rise approximately 15 to 20 feet above water level. The spring run flows about 1,050 feet to the St. Johns River through a dense hardwood and palm forest, with picturesque live oak trees leaning over the run. There is a growing manatee population giving park visitors a great viewing experience from the boardwalks and overlooks along the spring run. The spring serves as a winter home for many Florida manatees that come up the St. Johns to enjoy the relatively warm waters, a constant 72 Fahrenheit. The manatees are a lot of fun to photograph they are very playful with each other and they are usually several mama’s with their calves. The spring is so clear and beautiful you can see lots of native fish, there is a photo of a carp with a manatee in the background. The park also has a historic house built on a prehistoric shell midden, boat tours on the St. Johns River, picnic areas, cabins, a campground, and trails.