YES it's steep, after your 25 mile ride. I have one like that, in fact it's
http://app.strava.com/segments/639243 , which some visiting pro did at 19 mph and a bunch of others scoff at, but it killed me after a good hard 25 miles.
What I did was go out to the hill first (instead of last), and down and up 5 or 6 times. A couple of sessions like that and I feel like I've defeated it, and time for bigger challenges.