Left Hand Park, located in Boulder, Colorado, along Left Hand Creek, is a privately owned irrigation dam constructed in 1966 by the USDA NRCS. The dam stands at 65 feet tall, with a hydraulic height of 50 feet and a length of 1325 feet, providing a storage capacity of 2075 acre-feet. The primary purpose of the dam is for irrigation, with additional uses including fire protection, stock watering, and small fish pond support.

The dam is classified as having a high hazard potential, although its condition was assessed as satisfactory during the last inspection in October 2020. It is regulated by the Colorado Department of Water Resources, with permitting, inspection, and enforcement activities overseen by state agencies. Left Hand Park Dam poses a moderate risk level, with emergency action plans in place to address any potential safety concerns.

Left Hand Park Dam is a significant water resource infrastructure in the area, serving multiple purposes while also posing potential risks that are actively managed. Its location along Left Hand Creek and its role in irrigation highlight its importance in the local water supply system. Climate and water resource enthusiasts can appreciate the engineering behind the dam's design and operations, as well as the ongoing efforts to ensure its safe and efficient functioning within the regulatory framework.