I rode Lew Mo and Patriot's Path today, from Sussex Pike out to the second stream crossing (Roxiticus Road) and in Lew Mo rode all the trails. Here's the situation:
Lew Mo: Ground is surprisingly firm. Some wet areas on Green, and few of the usual muddy spots here and there, but very ridable. I dug some drainage channels in the major wet sections to help things along.
Just watch out for sticks/branches, there's a fair amount of trail debris. THe major (unridable) blowdowns have been cut through. There are a few smaller blowdowns on western Yellow trail, about mid-way along. They are easily ridden over. Hope to get the park guys on those soon (though I'm kinda liking them

)
Patriots Path. Ok from Sussex to Lew Mo (main trail, not Gilligans....Gilligans had a number of blowdowns BEFORE Irene, so it's likely still a mess). From Lew Mo heading west, ground is OK, but:
a) LOT of erosion on the section between Tingley Road and Brookside.
b) Major tree down at the trail junction just before the short steep hill in Brookside (can walk through/over it tho)
c) the small bridge just past the Mendham Police station is gone...nowwhere to be seen. But the stream crossing is rideable.
d) the small bridge further out (between the nursing home and the ice skating pond) is gone. Washed about 30 yards downstream, broken up. Stream crossing is not rideable, but you can (gingerly) hike a bike on the rocks in the stream.
e) the second stream crossing (near Roxiticus) is raging....the stepping stones are submerged and/or toppled over.