Short Route mileage? Divide loop at Clark, CO with Columbine Alternate

[johnny ballgame]

Howdy!  I'm interested in doing a short loop in Routt County, CO.  Starting from the Clark Store and going North on the GDMBR, then looping back south on the Columbine Alternate.  I plan to buy the section 3 map, but in the meantime can someone tell me the mileage of that loop?  Technically it's a "lollipop loop" as I'll retrace the part from Steamboat Lake back to the Clark Store. 

Thanks much!