Magnuson #1, also known as Lake Magnuson, is a privately-owned Earth-type dam located in Florissant, Colorado. Built in 1969 by the USDA NRCS, this dam serves primarily for recreation purposes, with a height of 32 feet and a length of 333 feet. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3, indicating the need for continued monitoring and risk management measures.

Situated on Grape Creek in Teller County, Magnuson #1 has a maximum storage capacity of 88 acre-feet and a normal storage level of 58 acre-feet. The dam's spillway is uncontrolled with a width of 37 feet, allowing for a maximum discharge of 938 cubic feet per second. While the condition assessment in December 2020 deemed the dam to be in satisfactory condition, its risk assessment underscores the importance of ongoing inspections and preparedness measures to mitigate any potential risks associated with its operation.

With the oversight of the Colorado Department of Water Resources, Magnuson #1 stands as a testament to the intricate balance between water resource management and recreational utilization. As water resource and climate enthusiasts continue to advocate for sustainable practices, the importance of maintaining and evaluating dams like Magnuson #1 remains paramount in ensuring the safety and resilience of our water infrastructure in the face of changing environmental conditions.