Garden Bridge A, Siskiyou County, California
Photo by Jay Wilbur
NABSQNO 10T-623625-4618525. Garden Bridges is a group of three lava natural arches that resulted from roof collapse over a lava tube formed by the Mammoth Crater flow, which occurred about 35,000 years ago. The most photogenic of the trio has been designated Garden Bridge A and is shown in the photo above. The other two are smaller and much less photogenic. The Garden Bridges trio is located about a half mile south of the Visitor Center within the Lava Beds National Monument, in Siskiyou County, California. Access is via the Garden Bridges Trail from the Cave Loop Road. Garden Bridge A has a span of about 20 feet.