Oh, yes, sorry Buffalo Creek.
I have ridden Hagerman both sides of the pass and to the tunnel. The road is steep but doable. The west side is less steep and/or bumpy. There will be traffic. The railroad grade to the tunnel is fun as well. (On the east side.) It is a railroad grade, so not steep. There are some detours that take a little more effort.
If you are looking for mellow rides, old railroad grades are mostly good. The midland trail sections can be a lot of fun. Lots of this type of riding near Colorado Springs, but sadly not recommended this year.
S