Bull Canal, also known as the Main Reservoir, is a key water resource in Weld County, Colorado, primarily used for irrigation purposes. Managed by the local government, this earth dam structure was completed in 1982 by designers Sheaffer & Roland. With a height of 35 feet and a length of 10,491 feet, the reservoir has a maximum storage capacity of 4,548 acre-feet and a normal storage of 4,000 acre-feet. Situated along Big Dry Creek-OS, Bull Canal plays a crucial role in supporting agricultural activities in the area.

Despite its high hazard potential, Bull Canal has been assessed as satisfactory in condition, with the last inspection conducted in November 2020. The reservoir operates under state regulatory agencies, including the Department of Water Resources, ensuring that it meets safety and environmental standards. With a moderate risk assessment rating, measures for risk management are in place to address potential emergencies. As a significant water management infrastructure in the region, Bull Canal contributes to the sustainable use of water resources and climate resilience efforts in Weld County.