Granby Dike 4 is a crucial federal water infrastructure located in Grand County, Colorado, protecting the surrounding area from potential flooding along the Colorado River. Completed in 1950, this earth dam stands at a height of 15 feet and spans 370 feet in length, with a maximum storage capacity of 539,760 acre-feet. Its primary purpose is hydroelectric generation and irrigation, serving as a vital resource for water management in the region. Managed by the Bureau of Reclamation, Granby Dike 4 is subject to regular state inspections, permitting, and enforcement to ensure its structural integrity and compliance with regulatory standards.

With a high hazard potential and a very high risk assessment rating, Granby Dike 4 is closely monitored for any signs of deterioration or potential threats to its stability. The dam features a controlled spillway and is equipped to handle a maximum discharge of 12,000 cubic feet per second, mitigating the risk of overtopping during periods of high water flow. As part of the broader network of associated structures within the NID system, Granby Dike 4 plays a critical role in water storage and distribution for agricultural and hydroelectric purposes, highlighting its significance in sustaining the local ecosystem and economy. Climate and water resource enthusiasts can appreciate the intricate design and operational complexities of this essential infrastructure that safeguards against natural disasters and supports sustainable water management practices in the Colorado River basin.