Otho Natural Bridge is located in the upper north fork of Mill Creek Canyon. The Natural arch (it is not a bridge)is well hidden and it is recommended to use topographic map 7.5 "Rill Creek" to found it. The span about 75 feet is located on the map at "natural arch". From the end of the road, hike along Mill Creek for 6 mile to a side canyon on the right and walk 1/2 mile this canyon to the arch. NABSQNO 12S-633567-4268463