The Loiza Dam, also known as the Carraizo Dam, is a significant water resource structure located in Trujillo Alto, Puerto Rico. Built in 1954, it serves a primary purpose of hydroelectric power generation and water supply. The dam is a gravity type structure with a height of 95 feet and a length of 728 feet, holding a maximum storage capacity of 30,000 acre-feet.

Managed by the Puerto Rico Electric Power Authority (PREPA), the Loiza Dam is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. The dam has a controlled spillway with a width of 368 feet and can discharge up to 312,000 cubic feet per second. Despite its high hazard potential, the dam is in satisfactory condition as of the last assessment in March 2022.

With its strategic location on the Grande de Loiza River, the Loiza Dam plays a crucial role in water management and energy production in Puerto Rico. As a key piece of infrastructure, it continues to be monitored and maintained to mitigate risks and ensure the safety of surrounding communities. For water resource and climate enthusiasts, the Loiza Dam stands as both a symbol of resilience and a vital component of sustainable water management in the region.