I did a bit of a search for Nelson's Sparrow along Seacoast Dr. Imperial Beach this morning during and after high tide, with no success.
Belding's Savannah Sparrows in low numbers ( <20 ) on that side
Did see an adult male Common Goldeneye in the channel nearer the south end.
Counted 14 Yellow-crowned Night -Herons scattered around the marsh, and perhaps a dozen Ridgeway's Rails ( that number seems rather low? ).