Cottonwood Creek Middle, also known as Cottonwood Detention Dam #2, is a crucial water resource infrastructure located in Boise, Idaho. Built in 1961, the dam serves the primary purpose of flood risk reduction along the Cottonwood Creek and Boise River. With a dam height of 20.4 feet and a hydraulic height of 15.4 feet, it plays a significant role in managing water flow and protecting the surrounding area from potential flood events.

Managed by the local government and regulated by the Idaho Department of Water Resources, Cottonwood Creek Middle has a fair condition assessment and a significant hazard potential. Despite its age, the dam continues to operate effectively, with regular inspections conducted to ensure its structural integrity and functionality. The dam's storage capacity of 40 acre-feet and drainage area of 16.6 square miles make it a critical component of the region's water management infrastructure, with a moderate risk assessment rating of 3.

Overall, Cottonwood Creek Middle stands as a vital piece of infrastructure in the region, providing essential flood risk reduction measures and safeguarding communities along the Cottonwood Creek and Boise River. Its strategic location and design exemplify the importance of water resource management in mitigating the impact of extreme weather events and climate change on local ecosystems and populations.