A natural bridge is found near the Eldorado Wilderness area just north of Nelson, Nevada. What’s the difference between a natural bridge and a natural arch? Arches are formed by various geological processes, weathering processes but not flowing water. Over time, persistent winds and freeze-thaw action have slowly eroded openings through vertical sandstone blocks. All natural bridges are all formed by flowing water and either spanned a waterway or did so in their past, and hence are a less common feature than an arch. This hike is only 2 miles roundtrip. Click here for pictures and a description of this hike ... Natural Bridge and Spring Hike.