Terry and I went there two years ago. Check the tide charts. The best time to go is during a very low tide. That is when the eagles gather to catch fish trapped in the exposed oyster beds.
http://www.pnwphotos.com/forum/showthread.php?8552-Seabeck-Washington-Bald-Eagles
http://www.pnwphotos.com/forum/showthread.php?8609-More-Seabeck-Bald-Eagles
Actually show up at least two hours BEFORE low tide. Three hours if you're dedicated. They do their best fishing as the tide goes out.

Man! Nice series. The shots you guys are getting with your Tamrons are off the hook!
Chad
Midshipman fish belong to the genus Porichthys of toadfishes. They are distinguished by having photophores (which they use to attract prey and after which they are named, reminding some of a naval uniform's buttons) and four lateral lines. Typical midshipman fishes, such as the plainfin midshipman (Porichthys notatus), are nocturnal and bury themselves in sand or mud in the intertidal zone during the day. At night they float just above the seabed. Some species have venomous dorsal spines and are capable of inflicting serious injuries if handled.
There are three genders of midshipman fish: females, type I males, and type II males. Type I and type II males have different reproductive strategies, and can be distinguished from each other based on physical characteristics. Type I males are eight times larger in body mass, and have much larger vocal organs. Type II males’ reproductive organs are seven times the size of type I males.
I am really amazed with the Tamron. I was a tried and true Nikon guy. Many years ago, in my films days, I bought a 3 party lens. It ended up being soft, and I vowed I'd never make that mistake again. So I stuck with Nikon glass for all of my lense. That is until I decided to "Go Big". Well, to get a 600 mm in Nikon flavor, you have to go big all right. $13,000 worth of big, and it's not a zoom lens. That wasn't in my budget, so when a friend showed me the 150-600 I was intrigued. I did a bit of research and I was impressed. Is it as good as the Nikkor 600 mm prime? Well, I wouldn't know but the reviews say it's not. I think that's only fair, considering how you can buy a 12 pack of them for the same price! But it's a dang good lens, and I'm happy with it.
Here's a shot of the fish formally known (by me) as a Sculpin becoming a crunchy eagle snack.
