Summit and River Crossing

Today after a dentist visit, I'll do 5 miles to the summit of Provin Mtn. and back, then try to cross the Westfield River.  I don't know what kind of barrier this is.  Will it be impassable?  I doubt it.  Is it just a matter of getting totally soaked? I think so, it may only be slow and a cold shock even if waist deep.   I may encounter forces beyond my imagining and not do it, who knows?  If I do it I can mentally gauge what it will mean at mile 7 of a 26 mile run.  This is the height of flooding season of course.