Nielsen Dam C, located in Bothell, Washington, is a privately owned structure that serves the primary purpose of recreation. Built in 1973, this earth dam stands at a hydraulic height of 9 feet and has a length of 250 feet, providing a surface area of 12 acres for recreational activities. Despite its modest size, the dam has a high hazard potential and is currently in poor condition as assessed in 2018. The dam is situated on Tr-North Creek and is under the regulatory oversight of the Washington Department of Ecology, ensuring state permitting, inspection, and enforcement.

With a maximum storage capacity of 16 acre-feet and a normal storage capacity of 12 acre-feet, Nielsen Dam C plays a crucial role in managing water resources in the Snohomish County area. The dam's drainage area covers 0.15 square miles, with a maximum discharge rate of 4 cubic feet per second. However, the dam's poor condition and high hazard potential highlight the need for regular maintenance and potential risk management measures to ensure the safety of surrounding communities. Despite these challenges, the dam continues to attract visitors for recreational purposes, offering a serene escape in the midst of a bustling city.

As a significant structure in the region, Nielsen Dam C stands as a reminder of the delicate balance between water resource management and recreational opportunities. With its proximity to Bothell and the surrounding areas, the dam serves as a valuable asset for outdoor enthusiasts and nature lovers alike. However, ongoing efforts are required to address the dam's poor condition and high hazard potential, emphasizing the importance of proactive maintenance and risk management strategies to safeguard both the dam and the communities it serves.