Boyd No. 1 is a privately owned dam located in Cottonwood, California, along the Tr Cottonwood Creek. Completed in 1971, this earth dam stands at a height of 31 feet and has a storage capacity of 218 acre-feet. The primary purpose of the dam is water supply, with additional functions for recreation. Its hazard potential is classified as high, but its condition assessment is deemed satisfactory as of September 2017.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Boyd No. 1 is subject to state regulation, permitting, inspection, and enforcement. Located in Shasta County, this dam plays a crucial role in providing water resources for the surrounding area. With a drainage area of 0.12 square miles and a surface area of 18 acres, Boyd No. 1 serves as a key infrastructure for water management and supply in the region.

As a significant part of the water supply infrastructure in the area, Boyd No. 1 is a focal point for water resource and climate enthusiasts. With its strategic location and vital functions, this dam contributes to the efficient management of water resources and plays a crucial role in ensuring water supply for both domestic and recreational purposes in the region. Its impact on the surrounding ecosystem and water availability makes Boyd No. 1 an essential structure for understanding the intersection of water management and climate resilience in California.