For anyone going to look for it, It was working the southeast section
between the trail and 1st street. It tended to stay lower in the canopy,
anywhere from 5-20 feet. It was singing quite frequently and hanging out,
oddly enough, with quite a few Clay-colored Sparrows, which made me doubt
what I was hearing! Lots of Swainson's thrushes and a flock of
Yellow-rumped and Orange-crowned Warblers were also in the area.
Note: the parking area by the arches is currently closed due to
construction.