Warriors Cycling posted their map for the race course:
I did most of this loop last fall and was blown away at how fun it was. I did it from Waterton Canyon and ended up with 31 miles and 4,200 ft climbed via strava/garmin edge. Take away the 12 RT miles on the Canyon road and a couple of hundred of feet and your left with apprx 3500-3800 ft over ~19 miles (1 lap)!!!
I'm unsure how fun it will be the second time around for the half marathon (or even a third lap for the marathon folks).
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Indian Creek Race on 5/18