Located in Pueblo, Colorado, St. Charles #3, also known as Lake Corwin, is a private earth dam completed in 1913 for water supply purposes. Standing at a height of 53 feet and a length of 8736 feet, this dam holds a storage capacity of 13940 acre-feet, with a normal storage of 8638 acre-feet. The dam, situated on Salt Creek, serves as a recreational spot as well, offering a surface area of 633 acres for visitors to enjoy.

Despite its fair condition assessment, St. Charles #3 poses a high hazard potential, prompting regular inspections by the Colorado Division of Water Resources (DWR). With a maximum discharge capacity of 30500 cubic feet per second, the dam has an uncontrolled spillway with a width of 658 feet. While the risk assessment indicates a moderate level of risk (3), the dam's emergency action plan (EAP) status and adherence to guidelines remain unspecified. Overall, St. Charles #3 stands as a vital water resource structure in the region, safeguarding against water scarcity and supporting recreational activities along Salt Creek.