The U.S. Mint's bicentennial commemorative quarter for Washington state features a leaping salmon, Mount Rainier, western hemlocks (the state tree), Washington's nickname; "The Evergreen State," and the date Washington became the 42nd state: 1889. Public domain image on Wikipedia.
Unofficial Nickname for the State of Washington
Washington was nicknamed "The Evergreen State" by pioneer C.T. Conover (a Seattle realtor and historian) for its abundant evergreen forests. All State Nicknames
Although "The Evergreen State" nickname is very well-known and widely used, it has not been officially adopted by Washington's state legislature.