Well you picked the year of the longest winter in 30 years i can recall!
You picked ideal bikes for the conditions though. How did you go following the GPS track? Last weekend of couple of locals recorded the Neslon to Swan Lake section. I will do the "pretty way" back into Portland next weekend, but where possible I will avoid the deep water sections.
I guess the advice to ride SWAT in late Spring and Autumn is sound if you are on bigger bikes.