The address is 3115 Thornhill Rd, Winter Haven, FL 33880. In the Winter Haven, Florida area you are looking for the intersection of Thornhill Road and Winter Lake Road. The parking area is only about three hundred yards down Thornhill Road from the intersection and is well signed. This website might be helpful in planning a trip to this fine photographic site. http://polknature.com/explore/marshall-hampton-reserve
This currently occupied Osprey nest is approximately three miles down the Panther Point Trail at the Marshall Hampton Preserve in Polk County, Florida. I was unable to tell if the nest contains eggs or chicks as yet. But the two Ospreys in the picture definitely showed possession of the nest site.