Lagunitas, also known as Lake Lagunitas, is a historic earth dam located in Marin, California, specifically in the city of Pt Reyes Station. Built in 1872, this dam serves as a crucial water supply source, providing a storage capacity of 341 acre-feet and covering a surface area of 22 acres. The dam stands at a height of 48 feet, with a hydraulic height of 42.5 feet, making it a significant structure in the region.

Managed by a public utility, Lagunitas Dam is regulated and inspected by the California Department of Water Resources (DWR) for safety and compliance. With a hazard potential rated as significant, the dam has been assessed to be in satisfactory condition as of September 2017. Despite being over a century old, Lagunitas continues to play a vital role in water resource management in the area, highlighting the importance of maintaining and monitoring aging infrastructure for climate resilience.

Situated on Lagunitas Creek, Lagunitas Dam is under the jurisdiction of the state of California and falls within the purview of state permitting, inspection, and enforcement agencies. With Congressman Jared Huffman representing the district, efforts are made to ensure the dam's continued functionality and safety. As water resource and climate enthusiasts, understanding the significance of structures like Lagunitas Dam is crucial in safeguarding our water supply and infrastructure in the face of changing environmental conditions.