The two side by side bridges are 89 and 70 feet long, 10 feet apart, and both are 26 feet wide. It is about 250 feet to the bottom and there aren’t any safety fences here. There is a large cavern further inside the rock formation behind the bridges that has a thin layer of rock covering it.
About half way to Gemini Bridges there is a side road leading into Four Arches Canyon that makes a good combination hike with the Gemini Bridges hike. About 1.7 miles down this road are four arches that are close together. My hike to Gemini Bridges and the Four Arches took 4:00 hours for about 7.5 miles on a 55 F mid March blue sky day. I carried 3 liters of water and drank two.