When first reading your description of Sunriver it made me think you had stumbled onto the set of a movie entitled "The Stepford Cyclists"
Sounds like a great place, the planners deserve kudos.
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2003 Iceman Challenge - 2:34:55 - 897 / 2,000*
2002 Iceman Challenge - 2:39:23 - 1093 / 2,186
2000 Iceman Challenge - 2:49:18 - 1516 / 2,153
*estimated