that really sucks you did all that work to get to the top and didnt even get to bomb down that road... This route sounds a lot like Cheyenne Canyon here in the springs. It averages out at about a 9% grade and is 3.1 miles long. I rode the canyon with 65 gear inches in 29 minutes on my fixed gear. There was a time trial up the canyon last month hosted by carmichael training systems, that was officially timed. they gave use these chips to put between the front dropout and the axle nut, that timed us as soon as we rolled over a pad at the start and stopped the time when we crossed the pad at the top. Tom Danielson of Garmin Slipstream hols the record of 13:34. Lance Armstrong rode the course a number of years back and his time was 14 minutes and some. I did change my rear cog for this ride from a 19 to a 22... so the GI would be 56. I timed in at 24:06. 24 minutes was my goal before the race by im not happy with the time now knowing that I told myself I was going to prepare for this race but didnt... theres always next year. It was cool though Chris Carmichael even races as well as a couple other coaches at CTS. Tom Danielson even came out and raced. His time was 2 seconds away from his initial record.
I think though the ride down was almost as bad as climbing up it on a fixed gear with that low of a gear, I do have a brake but I try not to use it so I can learn to spin very fast for long periods of time.