As noted, the vault toilet at the trailhead is locked. Don't know why. There was a secluded spot in the trees at the far end of the parking lot that had obviously been well-used as a substitute.
Found a lovely lunch spot on the river 3.4 miles in from the trailhead.
We walked only to the log bridge over the Foss River (5.1 miles in). That bridge would have required a bit of a scramble to get onto it, then a climb over a log marooned on top of the bridge, then maybe there might be a way around the water at the far end. We turned around instead.
There was a lot of water on the trail, and some iffy stream crossings. There was one extended stretch (maybe 100 yards?) where the trail was under a foot of water or more. Waterproof boots were a huge help, even when going around the deeper spots.
There were no bugs in the morning, but as temperatures warmed the mosquitos started coming out.

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