I led a birding and wildflower walk at Lake Miramar this morning (5/1/19) for group called the Scripps Ranch Wild Bird Enthusiasts. The only unusual sightings for that location were a juvenile Common Loon, a Clark's Grebe and a single Bonaparte's Gull. The loon and grebe were at various locations in the middle of the lake and easy to find. The gull was on the white boom near the dam.
Source: SanDiegoRegionBirding Latest Reports