The King County IMAP web map viewer with 5-foot contours incorrectly indicates that this spot is the 560' highest point in the central Eastside. However, this was likely due to an inaccurate treetop reading. Ground-corrected 2-foot LIDAR contour maps clearly indicate that a point 1000 feet to the SE is the highest point in the area, at 540'.
This area shows no rise from the surrounding terrain, but is being kept in the database for historical reasons. This link will take you to the real Bridle Trails Hill.