This morning, 8 Sept 2018, I birded the Yolo Bypass. I had heard that Todd Easterla and Scott Hoppe found a Brewer's Sparrow on Monday, and Steve Hampton recently tipped me off on where to look for them at the Bypass. So I spent 1 1/2 hours slowly birding the loop around the August shorebird fields, focusing on the brushes edges of the eastern edge, and the areas a bit to the north. At the Northeast corner of the shorebird fields, where the E-W path intersects a longer N-S trail, I worked through a small sparrow flock with many Savannahs, 1 Lincoln's, and 1 BREWER'S SPARROW. Maybe the same bird from Monday?
In that area I also noted a flyover SOLITARY SANDPIPER, giving that dark-winged impression, with dark underwing coverts contrasting against a white belly, and a dark back with white spots on the upperwing coverts.