70 Ranch is a privately-owned irrigation reservoir located in Orchard, Weld County, Colorado. The dam, designed by Brad Hagen, was completed in 2019 and serves the primary purpose of irrigation. With a dam height of 47 feet and a storage capacity of 5990 acre-feet, the reservoir covers a surface area of 167 acres and has a maximum discharge of 688 cubic feet per second.

This off-stream reservoir is regulated by the Colorado Department of Water Resources, with state permitting, inspection, and enforcement in place. The dam is classified as low hazard potential and is in satisfactory condition as of the last assessment in August 2019. While the risk assessment indicates a moderate risk level, the reservoir meets regulatory guidelines and has not undergone any significant modifications since its completion.

Overall, 70 Ranch is a well-maintained irrigation infrastructure essential for water management in the region. Climate and water resource enthusiasts will find this reservoir's design and operational details intriguing, showcasing a blend of engineering expertise and environmental stewardship in Colorado's water infrastructure landscape.