Caveat - This is not an everyday event. I've only witnessed 2 close up feeding events and the last was 2 years ago. The eagle was kind enough to allow one of the arcaheologsts to approach reasonably close..
it was interesting because at that point the bird, would not leave the meal, but put on a defensive display that was both raised feathers and a nictitating membrane across the eye. (K100-D, handheld with Da 55-300mm)
So close up eagle feeding is not a common event, however, as a 5 mile wetland National Park Reserve in the midst of developing urban tidewater, birds tend to visit at lot and sometimes you can catch an eagle atop one of the historical recreations...
More common are the distant sightings in trees or out over the river snapping a fish. In addition, come winter there is one nest visible from the parking lot of the Visitor Center, however, its at the limit of my 300mm glass....
While eagle sightings up close are not always predictable. There are many other birds which seem to be comfortable with people, I guess its the large volume of tourists that de-sensitize the animals to people. For example, one day walking off the field, this red tailed hawk sat on a tree almost within reach as I crossed the bridge (once again not a common event, but certainly unforgettable). I've also found this de-sensitization to wildlife occurring at the C&O Canal (outside DC) which makes from great Great Heron photos.
So, if you are willing to take a chance on what nature provides Jamestown Island (Historic Jamestown) is at the end of the Colonial Parkway which can be reached from Rte 64 via Rte 199. (Please don't go to Jamestown Settlement which has 3 ships, but is an amusement park without the wildlife.)
Also the Jamestown/Scotland ferry is a great source for birds. This spring, an osprey nest was occupied right next to the pier on the North side of the James on a couple of occasions I rode the ferry for a couple of hours so that I could shoot down into the nest. (Unfortuntely, I'm still trying to overcome the vibration problems from the ferry engine).
Sorry to run long, but its a great secret to share. Hope to see more Pentaxians out and about the island.....