Hi JT,
We are presently camped at Ice House Reservoir in our 41' Monaco Diplomat. We drove up here on June 18th, so I have some recent knowledge of the road to our location. Union Valley Reservoir is about another 6 miles down the road and as far as I can tell and it is slightly lower (300') in elevation. I think the road from Hwy 50 to Ice House is the hardest part of the trip. It is about 9 miles to our location with about a 2000' elevation gain. The road is in good condition, but it is pretty curvy and the climb is steady, slow (15 mph-30mph) and steep (average 7 % grade).
Bill