Elevation gain of 1,120 feet over the course of 3.7 miles. Haven't crunched the numbers to find the specific grade...
According to this site, http://www.csgnetwork.com/inclinedeclinegradecalc.html
, the total grade works out to be 5.733%.
Wind was a big factor. According to i-Bike data which was shared with me from someone not much slower, an estimate of 0.4 W wind resistance power for the first portion, followed by 40W on the second portion. The issue with this is the headwinds on the upper part partially neutralized it: placings were more largely influenced by the lower portion. It made sense to start hard then hang on, which is not what I did.
My powertap data (57kg, 6th/17 in E3)... the transition from the lower, tailwind portion to the upper, head/cross portion is at minutes 9-10: