The photos below were taken at Camp New Benson. I am not 100% sure that this is the same camp, but it seems very likely.
If the above photo is from the camp near Wahkeena, then it appears that it was not on the location of the current picnic area, but further north, across the rail tracks at Benson State Park. The article quoted below mentions work that was completed in 1935, the same year the photo of New Camp Benson was taken.
Apparently, Camp Benson Park was considered to be more of a side camp than a permanent camp, and did not have it's own designated camp number.
The CCC camp was apparently located on the City of Portland land donated to the USFS in 1939, not on the current land of the Benson State Recreation Area. This is probably where the old campground (current picnic area) is at Wahkeena Falls, north of the highway.
Confusing things even more, there were many side camps and not all of them were well documented, among with other issues that make keeping track of which camp is which a little tricky.
Otis 118