Joan and I were there from about 8:20-9:30 (latterly at the bridge).
There were many warblers, coming through in at least 3 pulses of maybe 20 at a time. Unfortunately they were almost all high in the trees and some distance from the path and the light was atrocious: they mostly looked like little grey birds. We id'd a few Yellows, one Wilsons, a BT gray (down by the concrete cylinders - again in a flock) and a couple of OCs. Also seen were a warbling vireo, willow flycatcher and 3 western tanagers (there were probably more high in the eucs). No bird visited the seep itself, which has plenty of water, while we were there.
There was another flock at the bridge, mixed in with bushtits - all those id'd were Yellows.