A few weeks ago I posted a query re where are the birdy sewage ponds in
Washington. Here are the responses I received, in alphabetical order:

Concrete (Skagit County) - tiny roadside sewage lagoon
Everett
Grandview (access not always available)
Hoquiam
Kent
Ocean Shores SP
Stanwood
Vancouver Lake Lowlands--Fruit Valley Wastewater
Washougal--surrounded by the Steigerwald Lake Refuge

Many Thanks to all who replied.

Mary Klein
Seattle WA
bassclef at seanet.com