No, the Q's depot is long gone.
There are still Q depots at Dubuque IA (part of the Mississippi River Museum) and in WI at Prairie Du Chien & Pippin. La Crosse has CB&Q 4-6-4 Hudson #4000 (formerly streamlined Aeolus) on display along with a CMStP&P caboose & Grand Crossing Tower.
Potosi WI is quite a long detour from NE Colorado !!!
Did you railfan during the whole trip ?