One of the Eastside’s treasures, the “Slough” is host to an abundance of flora and fauna. On your next walk along the Sammamish River Trail during these idyllic summer days and evenings, take a look into the Slough itself. Although altered extensively in the 1960s for flood control by the U.S. Army Corps of Engineers, it remains an Eastside treasure, host to an abundance of flora and fauna.