The formula has been modified to better match the difficulty rating and, hopefully, make it more fun. Special kudos to those undaunted cachers that solved this puzzle in it's original form!!!
Bocce Crew calls both Arizona and Michigan home. In both states, water is of particular importance due to either omnipresence or scarcity. Any two states are 4% of the US total, but these two are home to 10% of the largest 100 lakes in the country (considering that certain man-made lakes are ranked by 20th century averages).
The final is here: North HM HM.TXP West SSE MP.YZE
Where X=E+S Y=R/2 Z=R-S
Cache difficulty is mental (since it's a puzzle). Physical difficulty is 1.5.
https://en.wikipedia.org/wiki/List_of_largest_lakes_of_the_United_States_by_volume