On the Christmas Bird Count in December 2015, a Painted Redstart was located at Irvine Lake. One had been seen previously in Silverado Canyon but it was ultimately determined this December visitor was in fact a second / different Painted Redstart to arrive in Orange County.
As of January 2016 the Painted Redstart can still be seen adjacent to the bait and tackle shop. Some have reported views from outside the gated area as well.
Here’s a few images of the Irvine Lake visitor that were taken on December 27, 2015 and also a link to the Painted Redstart photo gallery: