Reeder, also known as Anderson Lake, is a historic irrigation dam located in Mesa, Colorado. Completed in 1889, this earth dam stands at a height of 30 feet and spans a length of 750 feet, with a storage capacity of 331 acre-feet. The primary purpose of Reeder is irrigation, with additional uses including fire protection, stock watering, and recreation. Despite its age, the dam has a low hazard potential but is currently rated as unsatisfactory in terms of condition assessment, last inspected in 2005.

Managed by local government authorities and regulated by the Colorado Department of Water Resources, Reeder is situated on Kannah Creek and falls under the jurisdiction of the state for permitting, inspection, and enforcement. With a spillway width of 25 feet and a maximum discharge capacity of 185 cubic feet per second, the dam poses a moderate risk (rated 3 out of 5) according to risk assessment criteria. While there have been no recent modifications or updates to the emergency action plan, the dam has necessary outlet gates in place for controlled water release.

Water resource and climate enthusiasts interested in Reeder will find a blend of historical significance and contemporary management challenges associated with this vital irrigation structure. The dam's location in the picturesque city of Whitewater offers opportunities for recreation and water supply, but also underscores the importance of consistent maintenance and monitoring to ensure public safety and environmental sustainability. As discussions around water resource management and climate change adaptation continue, the case of Reeder serves as a reminder of the ongoing need for resilient infrastructure and proactive risk assessment strategies in the face of evolving conditions.