Coastways is a private dam located in San Mateo, California, with a primary purpose of water supply for irrigation and domestic use. Completed in 1951, this earth dam stands at a height of 46 feet and has a storage capacity of 100 acre-feet. It is situated on Tr Ano Nuevo Creek, near the Pacific Ocean, making it a crucial water resource in the region.

Managed by the California Department of Water Resources and regulated for safety by the Safety of Dams agency, Coastways is subject to regular inspections to ensure its structural integrity. With a high hazard potential but a current satisfactory condition assessment, the dam plays a vital role in water management in the area. The dam's spillway type, maximum discharge capacity, and other key details are not specified in the available data.

Although there have been no reported modifications or emergency action plans for Coastways, its location and function underscore the importance of sustainable water resource management in the face of climate change and increasing water scarcity. Enthusiasts of water resources and climate adaptation will find Coastways to be a fascinating case study in the intersection of infrastructure, environmental stewardship, and community resilience.