The sun had already set and by the time the last quarter was placed in a game bag we were turning on our headlights. We lashed down all the meat and triple checked the kill zone to ensure we were not leaving anything behind. We marched out of the bowl and down into the drainage as it was getting well into darkness. It was steep, rocky, and wet as we marched along the stream emptying the bowl and we struggled to make progress. We encountered a really big waterfall that dropped 15 feet or more. The walls were vertical on either side and we had trouble getting out of the narrow space and had to double back before we found an exit and a way around the obstacle. We had to climb nearly straight up to get out and then around. We kept up the march until we were a tenth of a mile from where our gear was left previously at the base of the mountain: our tent, food, and extra clothes in dry bags. We had missed the location where we had crossed the stream and gone up the other side. We had now passed the point and were not watching the GPS close enough. We were exhausted and decided to siwash on the side of the mountain with just sleeping bags and the meat, cape and horns. I had my homemade Tyvek bivy sack and put my sleeping bag inside it and we were all asleep in mere minutes. It was about 3 or 4am and lucky for us we did not have rain that night or it was light enough that it did not wake me. We all slept in until about 9 or 10am the next morning. When we got up we could see across the steep draw that we climbed up and out to where the location of our camp was that we could not find in the dark ... we were so close but could not make it up the sheer rock wall on the opposite side. We left the meat, cape and horns under some brush and out of the sun to collect our gear on the opposite side. We ate food and had to make a decision on getting out and back to base camp.