enblethen wrote:
Slide is up by Riggins, ID. OP plans on going south from I-84 the way I understand it. Slide is north of I-84 like 100 miles.
You may know more about the OP than is obvious from the post, but I don't see any mention of I84 or first passing through Oregon. So I assumed they were thinking picking up 95 further north, such as Spokane or Lewiston.
US95 south of I84 remains of Idaho for only 60 miles (out of a total of 500). I was going to say that's pretty flat, but I see from the map it has a 1000 ft climb over a ridge. When I drove to Jordan Valley some years ago I went through Succor Creek, bypassing that part of US95.
In terms of road conditions, weather related or grades, it's the central part of US95 that should be of most concern. The main grades pass in and out of the Snake and Salmon River valleys.
One spring when I vacationed in the Idaho mountains, the main state park at McCall didn't open until after Memorial Day due to lingering snow. That's somewhat higher than US95 at NewMeadows. Later we encountered snow flurries at Lost Trail pass on US93.