La Plata Dam, also known as Lago La Plata, is a gravity dam located in Toa Alta, Puerto Rico, along the La Plata River. Completed in 1974, the dam stands at a height of 131 feet and serves the primary purpose of water supply, with a storage capacity of 37,000 acre-feet. The dam's multi-arch core type and rock foundation contribute to its structural integrity, while a controlled spillway with a width of 714 feet helps manage excess water flow.

With a high hazard potential and a very high risk assessment rating, La Plata Dam is closely regulated by the Puerto Rico Electric Power Authority (PREPA). Regular inspections ensure the dam's satisfactory condition, with the last assessment conducted in October 2020. Emergency action plans are in place, although details on their preparation and effectiveness are not specified in the available data. The dam's location in a densely populated area underscores the importance of its role in water resource management and the need for ongoing monitoring and risk management measures to safeguard the surrounding communities and environment.