Historical clue formulations

• Milwaukie and Mount Hood are here — 2026-09-02
• First state to implement a bottle deposit to fight littering — 2026-06-28
• Only U.S. state whose flag features a different design on each side (the back is a beaver!) — 2026-05-24
• Crater Lake's state — 2024-11-25
• First state to conduct all of its elections by mail — 2024-05-22
• First state to legalize psychedelic mushrooms — 2023-11-05
• Home to the deepest lake and river gorge in the U.S. — 2021-12-22
• Subject of the campaign slogan "Fifty-four forty, or fight!" — 2015-06-20
• ___ Trail — 2015-06-09
• Snake's place, in part — 2014-11-06
• It's north of California — 2014-10-20
• Setting for TV's "Portlandia" — 2013-09-30
• Terminus of a famous trail — 2012-05-22
• The Ducks of the N.C.A.A. — 2011-01-16
• Home of the U.S.'s last active nickel mine — 2010-06-06
• ___ Treaty, establishing the 49th parallel as a U.S. border — 2009-10-11
• Hells Canyon locale — 2006-10-01
• Salem's home — 2006-09-26
• Home of the John Day Fossil Beds National Monument — 2006-08-06
• Beaver State — 2006-07-17
• Crater Lake's state — 2004-10-26
• Farthest point of the Lewis and Clark expedition — 2003-04-13
• Salem's home — 2002-04-08
• The Snake borders it — 2002-03-20
• Where Mount Hood is — 2001-04-18
• Where to find Eugene — 2001-04-08
• Fremont National Forest site — 1999-11-14
• Old trail destination — 1999-10-22
• Crater Lake locale — 1998-01-07
• Where to find Eugene — 1997-03-11
• Mt. Hood site — 1995-12-29
• Eugene's place — 1995-05-10