Terwilliger Valley

Terwilliger Valley
Facing east, a view of Terwilliger Valley with Toro Peak in the back
Area	12.5 square miles (32 km2)
Geography
Location	California
Coordinates	33°30′00″N116°38′18″W / 33.5000301°N 116.6383518°W / 33.5000301; -116.6383518

Terwilliger Valley is a basin in Riverside County, California. The valley lies at an elevation of 3,885 feet (1,184 m). ^[1]

Geography

It is 2 miles southeast of Anza Valley, however unlike Terwilliger Valley, water from the Anza Valley eventually drains into the Pacific Ocean. Terwilliger Valley is drained by Coyote Creek, which leads to Coyote Canyon in Anza-Borrego Desert State Park, a popular destination for desert wildflower viewing. ^[2]

The basin is immediately west of the San Jacinto Fault. ^[3] It was the site of a 6.0 earthquake in 1937. ^[4]

References

1. U.S. Geological Survey Geographic Names Information System: Terwilliger Valley
2. Anza-Borrego Desert State Park - Wildflowers from theabf.org accessed February 5, 2025.
3. Terwilliger Valley Groundwater Basin from water.ca.gov accessed February 5, 2025.
4. San Jacinto Fault (Terwilliger Valley) Earthquake from scedc.caltech.edu accessed February 5, 2025.

33°30′00″N116°38′18″W / 33.5000301°N 116.6383518°W / 33.5000301; -116.6383518