Signal #1, located in Fort Lupton, Colorado, along Big Dry Creek, is a significant irrigation dam with a height of 22 feet and a length of 1976 feet. Built in 1890 by the USDA NRCS, this Earth dam serves the primary purpose of irrigation, storing up to 345 acre-feet of water with a normal storage capacity of 260 acre-feet. Despite its historical significance, Signal #1 is classified as having a significant hazard potential and an unsatisfactory condition assessment.

Managed by the local government and regulated by the Colorado Department of Water Resources, Signal #1 undergoes inspections every two years to ensure its structural integrity and safety. With an uncontrolled spillway and a maximum discharge of 110 cubic feet per second, this dam plays a crucial role in managing water resources in the region. While it poses a moderate risk, efforts to mitigate potential hazards and enhance its safety measures are ongoing to protect downstream communities and infrastructure.