Seaside City, also known as Peterson Point Dam, is a vital water supply infrastructure owned by the local government in Clatsop, Oregon. Situated on the Necanicum River, this earth dam stands at 45 feet high and has a hydraulic height of 30 feet, providing a storage capacity of 170 acre-feet. Completed in 1996, Seaside City serves as a crucial resource for the city's water needs, with a surface area of 12.5 acres and a drainage area of 1.4 square miles.

With a high hazard potential but a satisfactory condition assessment as of October 2020, Seaside City is equipped with slide gates for outlet control and undergoes regular inspections to ensure its safety and functionality. The dam plays a crucial role in water supply management for the city, with a maximum discharge capacity of 68 cubic feet per second. Despite its age, Seaside City continues to meet the water supply needs of the community and is regulated by the Oregon Water Resources Department, demonstrating a commitment to ensuring the sustainability and reliability of the region's water resources in the face of climate challenges.