Mc Cormick #1 is a privately owned dam located in Hooper, Colorado, along the Rio Grande-Os river. Completed in 1972, this earth dam stands at a height of 11 feet and has a length of 3750 feet. Its primary purpose is irrigation, with additional functions including fire protection, stock, and small fish pond management.

The dam has a storage capacity of 82 acre-feet, with a normal storage level of 61 acre-feet. Despite being rated as having a low hazard potential, it is considered to have a high risk level with a risk assessment of 2. The last inspection of Mc Cormick #1 took place in August 1986, with an inspection frequency of every 6 years.

Although the condition of the dam is currently not rated, it is regulated, permitted, inspected, and enforced by the Colorado Division of Water Resources. With its strategic location and crucial role in irrigation and water management, Mc Cormick #1 serves as a significant asset in the water resource infrastructure of Saguache County, Colorado.