Historical clue formulations

• Dangerous (and thrilling!) part of a river, to canoeists — 2024-01-29
• Water hazards — 2020-10-14
• Rafter's challenge — 2015-09-02
• Canoeist's challenge — 2014-10-15
• White water — 2011-05-03
• Canoeing challenge — 2009-01-18
• Rafting area — 2006-12-10
• Whitewater part of a stream — 2004-09-13
• Area of danger — 2004-02-07
• Tippy canoe area — 1997-07-06
• Canoeist's danger — 1997-06-18
• White water feature — 1996-10-05