O-Utah has several US alpine ski areas mapped. I've seen the one of Brighton (made by Ed White) which covers the base area and some up-slope terrain, and from their schedule it appears they may have maps of Solitude and Snowbasin as well. They also have a ski-O map of Soldier Hollow, which I think Boris has been on before.
BAOC has a sprint map of the base of Northstar at Tahoe. I've run on that one and it has the whole base village and some of the lifts on it. They held a sprint in the village once.