I'll be interested to see what Christopher finds this weekend. We're at 8600' about 10 miles as the crow flies from LCW. We've had over a foot of snow in the last week. Including 4" last night. And we've had lots of snow before that in May. I did the northern loop last Memorial Day weekend. We didn't have the late snow like we have this year and there was still snow on the north side of Rolling Creek. I'm thinking there will be more this year but I'm still heading out there. BTW, don't make camp along Wigwam on MD weekend. Too many yahoos out there because it's a short, flat hike in from the LP TH. Last year on Saturday night some idiot was shooting at 21:00 and 02:00. Glad I always carry earplugs. Normally for when it's windy but you never know.
This situation is where a SPOT comes in handy. I show my wife my proposed route and the options if I run into too much snow, etc. I send OK alerts whenever I change routes so she knows which way I'm going.
When I was a teen in Boy Scouts our troop backpacked from the Lost Park campground to the Goose Creek TH. Right in the middle of the trip we entered a box canyon that was maybe 50 yards wide and 150 yards long. The lost creek came out of the rock face creating small caves that we explored and re-entered the rocks about 150 yards later. There was a sandy beach on both sides of the river and it looked as though no one had been there recently.
I see that on my NatGeo map. It's about halfway between Brookside-McMurdy and Rolling Creek. There's a stream crossing there with 2 or 3 logs making a bridge. It shows an unmaintained trail heading south that gets within a mile of McCurdy Park Trail. It looks like if you take that trail until it disappears and then follow the creek, you will then hit the MP trail right about where it turns south a little ways short of where the switchbacks start. Too early for that but that would be something interesting to check out later.