Picking one newspaper at random it does rather confirm that the 'flood' was actually a number of rivers flooding their floodplains and the human infrastructure sat upon them. The Nevada Democrat. [volume] (Nevada, Calif.) 1854-1863, January 21, 1862, Image 1
Im not disagreeing with you, per se. but the event at least has some precedence in recorded history outside of modern day journalists attempting to reframe the event in the context of the climate change scam.