I finally got best looks (so far) at Harris' Hawk today from noon-1PM along with seven other interested birders. "Crappy" photos here:
http://coloradobirder.club/m/photos/browse/album/Running-Deer-Natural-Area-Fort-Collins/ It mainly hung out in large field near motorcycle business north of Prospect Road on I25 Frontage Road. Seen on fence line along irrigation ditch chasing mallards; seen in the low shrubs nearest motorcycle business-perched very low could only see by parking right before the sewer drainage near the motorcycle driveway. Also, seen in trees along west side of motorcycle business close to the building. It eventually lifted off, soared for a bit across I25 then circled around and veered towards Visitor Center.
Also, saw 2-3 Red-taileds in same area perched as well as two Great Horned Owls perched low in same area.