After the first pair of Seattle Peregrines established their territory in downtown Seattle, a second nest was found five years later (1999) on the West Seattle Bridge. A pair of unbanded adults hatched young, but the nest was predated (probably by a Great Horned Owl), and both adult Peregrines left the site that fall.
After that, two females held that territory, but they appeared to share a common problem: a mate that probably had another nest elsewhere with his alpha female. No mate, no nest. In 2005 the prevailing West Seattle female finally had a full-time mate, and they reared four beautiful young and nested successfully again in 2006.
The West Seattle Bridge continues to be a successful nest site. One of the West Seattle offspring now nests in Tacoma. And an offspring from the best-studied Tacoma nest (see Tacoma Peregrines) has nested at the West Seattle Bridge. [ED please clean this up for accuracy]