According to Cornell Ebird , the last Prospect Lake or Park sighting for Redhead occurred November 27th in 2007 ,6 birds. Spotted by S Whittle. A long time ,8 years ago.
Here's the records http://ebird.org/ebird/map/redhea?neg=true&env.minX=&env.minY=&env.maxX=&env.maxY=&zh=false&gp=false&ev=Z&mr=1-12&bmo=1&emo=12&yr=all&byr=1900&eyr=2015
