From shore is going to be really tough in Western WA. On the eastside I've arrowed a lot, from a boat, in the mid Columbia, Banks lake, and Potholes reservoir. The only place that I've ever shot from shore has been in the wasteway at Potholes. Bring them home, run them through a chipper. Rose bushes really appreciate a good chopped carp feeding.
When they drain Banks lake to work on the dam later this year. Archery carp hunting should be really good in August/September/October.