The Yelm Canal Dike in Washington is a crucial piece of infrastructure for hydroelectric purposes along the Nisqually River. This earth dam, standing at a height of 35 feet, was completed in 1930 and has a storage capacity of 350 acre-feet. With a spillway width of 12 feet and controlled spillway type, this structure plays a significant role in managing water flow and ensuring the safety of downstream areas.

Managed by the Federal Energy Regulatory Commission, the Yelm Canal Dike has been inspected as recently as October 2020 and is deemed to have a high hazard potential. Despite its age, this dam remains vital for water resource management in the region. Emergency action plans are in place, although details on condition assessment and risk management measures are not currently available. The surrounding area is at very high risk, indicating the importance of continued monitoring and maintenance of this critical infrastructure to protect both the environment and local communities.

As water resource and climate enthusiasts, understanding the significance of structures like the Yelm Canal Dike is essential for appreciating the complexities of water management in a changing climate. This dam not only serves a functional purpose for hydroelectric power generation but also plays a key role in flood control and water storage. With its high hazard potential and very high risk rating, it is evident that ongoing attention and investment are needed to ensure the safety and efficacy of this crucial component of the water infrastructure in Thurston County, Washington.