I did hear the sharp chink notes of a NORTHERN WATERTHRUSH. First heard toward the NE corner of Talbert Lake but flew south just as I got to the spot. I briefly heard it later when it flew past me into the Island slough from the lake.
A MacGillivray's Warbler was also skulking around the west end of the Island slough.
I heard a handful of intermittent "spink" notes in the willows around Loren's Ditch but was unable to get a visual to verify whether it was the Lucy's Warbler continuing on or just a Nashville.
Note the annual Civil War reenactment is this weekend so the park is busy and very noisy.