This is almost certainly cabin 13 in Outpost - a photo taken very soon after the cabin was built in '58. Cabins 11 and 13 stood (and stand--but they are numbered differently and it's no longer Outpost there) along the left side of the field in the flat two flats up from the main level of camp. Between 11 and 13 was and is a path through the woods that leads up to the new cluster of five cabins, originally Lenape (16-20). Behind the cabin you see a tall tree. It's gone and what's located there now is Quirk Lodge, the super-est of the SuperLodges of the 90s.
Ken Nathanson thinks this might be cabin 6. But the slope seems too steep to me, and the woods too near. Hmmmm. Kenny writes: "Yea, from memory I thought the slope was too steep too, but after seeing the photo of yours that I linked to I see that cabin seemed to have a good slope to it. I don’t see how that could be cabin 14. Cabin 13’s front faced the trail as you walked up and cabin 14 would be to the right. Plus looking carefully at photo there is a lot of open space to the left of that cabin." Here's the view of cabin 6, from further back, in the mid-60s.
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Geoff Hazel is sure this is cabin 13. He was a camper there in 1961 and remembers that as a cabin project the campers painted the then-raw wood cabin with creosote.