SHARCRASH
Thanks for the answers! One unanswered though: are you sure there is no more possibility to cross without touching water, no more trunk/bridge by covering a large part of the gully? 

Sorry for being thorough but i see so many people misplacing or not finding features that actually exist. Example about this ancient roman ford https://www.openstreetmap.org/node/7010793177 The original contributor had placed it near the northern wood bridge. I questioned his position thank to LIDAR imagery in a fixme and he replied he was sure whereas in fact it is way closer to Reilendermillen's parking, barely 10-20m away, a difference of 60m. On terrain, I checked the entire waterflow from the bridge until i finally found the leftover ruins near the parking, I walked on the road for nothing. 