Historical clue formulations

• Sloped roof support — 2021-01-24
• Murder : crows :: ___ : turkeys — 2016-09-28
• Whitewater enthusiast — 2015-05-03
• Overhead supporter — 2009-04-04
• Part of a support system? — 1999-06-25
• Whitewater enthusiast — 1998-07-08
• Canyon thrill-seeker — 1996-07-07
• Roof support — 1995-07-11