Located in Weld, Colorado, D.A. Lord #4 is a private-owned reservoir with a primary purpose of irrigation. This Earth-type dam stands at a height of 16 feet, with a hydraulic height of 16 feet and a structural height of 20 feet. With a storage capacity of 2725 acre-feet and a surface area of 200 acres, this reservoir serves both irrigation and water supply needs in the region. The dam's spillway type is uncontrolled, with a width of 75 feet.

The reservoir's hazard potential is rated as low, with a fair condition assessment as of June 2019. Despite its moderate risk assessment rating, the dam is regulated and inspected by the Colorado State Department of Water Resources, ensuring its safety and compliance with state regulations. The reservoir is situated along the Lost Creek-TR river/stream, with a drainage area of 57 square miles. Its maximum discharge is recorded at 2580 cubic feet per second, making it a crucial water resource in the area for both agricultural and domestic purposes.