Decker, also known as Decker & Pearce or Carr Reservoir, is a privately owned dam located in Weld County, Colorado. Built in 1892 by designer J. Hislop, this earth dam stands at a height of 14 feet and serves primarily for irrigation purposes. With a storage capacity of 680 acre-feet, Decker reservoir covers a surface area of 31 acres and is regulated by the Colorado Department of Water Resources.

The dam spans 962 feet in length and features an uncontrolled spillway with a width of 800 feet. Despite being classified as having a low hazard potential, Decker is regularly inspected and deemed to be in satisfactory condition as of its last assessment in 2009. The surrounding area, including the Spring Creek-OS river or stream, benefits from the moderate risk management measures in place for this structure.

Representing a piece of Colorado's water infrastructure history, Decker serves as a vital resource for irrigation in the region. With its strategic location in Pierce and oversight by the state regulatory agencies, this dam continues to play a crucial role in water resource management and climate resilience efforts in the area.