The bridge at Lost Valley has finally given out. There's a small reroute just north of it to allow you to get around it temporarily. The good news is that GORC is building a reroute that will bypass it cutting out about 0.5 miles of fire road, but adding around 2 additional miles of singletrack that will be similar to the trail added with the "Haunted Hollow" reroute 4 years ago. This is a lot of trail, and we only have 2 workdays to do it, so we're going to need a lot of help. More details can be found here.
This is what most of the river bottom trail looked like on Saturday. The fact that you could barely walk without falling (2 members of our work party slipped and fell just trying to get to the work area) didn't seem to deter users from being out on the trail. We saw several groups of hikers, a couple of equestrians, and some trail runners. I suppose all of the pooling water on the trail surface kept the mud from caking up on their shoes to the point where they weren't able to lift them. The bike tracks in the top picture probably came from someone riding the fireroad from Lone Elk. They were probably forced to turn around as soon as they hit the singletrack by their tires and drivetrain being instantaneously clogged with mud, as the tracks didn't appear to continue much further.
We did manage to get some work done anyway. Sawyers cleared the trail along the river, and a new crossing was constructed just north of where Tyson Creek washed out a culvert, and the trail along with it. I'm not sure how effective it will be in the long run, because there are few options for a crossing here, but when it's dry, it should at least be possible to get across the creekbed.