Rockwell, a privately owned dam located in Weld County, Colorado, serves primarily for irrigation purposes on the Big Hollow river. Built in 1885, this Earth-type dam stands at 16 feet high and 1100 feet long, with a storage capacity of 441 acre-feet. Despite its low hazard potential, Rockwell has been deemed unsatisfactory in its condition assessment as of October 2016.

The dam's spillway is uncontrolled with a width of 24 feet, and it has a maximum discharge capacity of 1050 cubic feet per second. Although Rockwell has not been modified in recent years, it undergoes inspections every 6 years to ensure its safety and compliance with state regulations. The risk assessment for Rockwell is considered moderate, with a rating of 3 out of 5, indicating the need for ongoing risk management measures.

For water resource and climate enthusiasts, Rockwell presents a historical landmark in Colorado's irrigation infrastructure. Its location in the scenic city of Johnstown, along with its vital role in water management on the Big Hollow river, makes it a significant structure worth monitoring and preserving for future generations. As climate change impacts water resources, understanding and maintaining dams like Rockwell becomes increasingly crucial to ensure sustainable water usage and management in the region.