Back-Up Water Supply, also known as Yates Center City Dam, is located in Woodson County, Kansas, along the South Owl Creek. This earth-type dam, with a height of 36 feet and a hydraulic height of 39 feet, was completed in 1936 to serve as a critical water supply source for the local community of Petrolia. With a storage capacity of 2015.6 acre-feet, this dam plays a vital role in maintaining a reliable water source for the region.

Despite its importance, Back-Up Water Supply has a high hazard potential due to its structural design and location. Although not currently rated in terms of condition assessment, regular inspections are conducted to ensure its safety and functionality. The dam's spillway, which is uncontrolled and 107 feet wide, helps manage water flow during periods of excess water, further highlighting its significance in water resource management.

Given its moderate risk assessment rating and the potential impact of a dam failure, it is crucial for local authorities to have emergency action plans in place to mitigate any potential risks. The dam's association with the local government underscores the importance of community involvement in ensuring the safety and sustainability of this vital water infrastructure. As climate change continues to impact water resources, the Back-Up Water Supply serves as a critical lifeline for the region's water supply needs.