Davis No. 1, also known as Twin Lakes, is a private irrigation structure located in Boulder, Colorado. Built in 1910 by Rocky Mountain Consultants, this earth dam stands at a height of 13 feet and has a storage capacity of 189 acre-feet. Serving primarily for irrigation purposes, the dam also offers recreational opportunities in the area.

With a high hazard potential but a satisfactory condition assessment, Davis No. 1 undergoes regular inspections and maintenance to ensure its safety and functionality. It features an uncontrolled spillway type and a slide (sluice gate) outlet gate, with a maximum discharge capacity of 84 cubic feet per second. The dam has been modified in 2001 for hydraulic and structural improvements, reflecting a commitment to ongoing safety upgrades.

Davis No. 1 plays a vital role in managing water resources in the region, highlighting the intersection of water infrastructure and climate resilience. With its historical significance and continued operational relevance, this dam stands as a testament to the importance of sustainable water management practices in the face of changing environmental conditions.