My understanding is that statistically the Eagles tend to congregate and feed close to the dam, making your spot the best spot in that regard.
The best shooting I've done is sometimes down at the south end, but only in the afternoon, and that requires the turbines to be on in the afternoon, and the eagles have to be fishing there. Or down on the boat ramp, to get low without dealing with the rocks, but that needs the birds feeding rather far south too.
With all the space there along that promenade it is amazing that there aren't any really outstanding spots to shoot from; it's mostly a choice of lesser evils, all surrounding the obstruction of the power lines.
Your spot is a good starting point, although I've gotten some nice shots of perched eagles and eagles flying about just north of the first porta-potties, shooting into the first set of trees by the river. There is some nice light there. But that could be argued on the north end too
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