Loíza Lake

Carraízo Dam is a concrete gravity dam located in the municipality of Trujillo Alto, Puerto Rico within the flow of the Río Grande de Loíza. Its construction was completed in 1953. Carraízo Dam impounds Loíza Lake which serves as Puerto Rico's main water reservoir.

La Gloria is a barrio in the municipality of Trujillo Alto, Puerto Rico. Its population in 2010 was 4,665.

Carraízo is a barrio in the municipality of Trujillo Alto, Puerto Rico. Its population in 2010 was 16,399.

Trujillo Alto barrio-pueblo is a barrio and the administrative center (seat) of Trujillo Alto, a municipality of Puerto Rico. Its population in 2010 was 673.As was customary in Spain, in Puerto Rico, the municipality has a barrio called pueblo which contains a central plaza, the municipal buildings (city hall), and a Catholic church. Fiestas patronales (patron saint festivals) are held in the central plaza every year.

Quebrada Negrito is a barrio in the municipality of Trujillo Alto, Puerto Rico. Its population in 2010 was 5,610. The barrio was created in 1899.

The Puente de Trujillo Alto is a Pennsylvania through truss bridge built during 1939–1941 in Puerto Rico in the Trujillo Alto municipality of Puerto Rico. At was the longest single-span bridge in Puerto Rico.: 32 The bridge construction was funded as part of the New Deal. The supporting structures and bridge were built by Robert Prann, an engineer who established private practice in Puerto Rico, with steel components manufactured by U.S. Steel.Crossing 70 feet (21 m) above, it spans the Río Grande de Loíza, the largest river by volume in Puerto Rico. The height was intended to keep this bridge above flooding that had destroyed a previous bridge in 1936. However, in 1945 even this bridge was flooded over and almost carried away.A four-lane concrete bridge was built adjacently during 1983-85 as a replacement, with the historic bridge being slated for demolition, but local protests led to its being kept.

San Antonio is a barrio in the municipality of Caguas, Puerto Rico. Its population in 2010 was 2,224.

Trujillo Alto (Spanish pronunciation: [tɾuˈxiʝo ˈalto]) is a town and municipality of Puerto Rico located in the Northern Coastal Plain, on the boundary between the karst zone and Sierra de Luquillo, north of Caguas, and Gurabo; southeast of San Juan, and west of Carolina. Trujillo Alto is part of the San Juan Metropolitan Area, which includes the municipalities of Bayamón, Guaynabo, Cataño, and Toa Baja. The city is spread over 6 barrios and Trujillo Alto Pueblo (the downtown area and the administrative center of the city). It is part of the San Juan-Caguas-Guaynabo Metropolitan Statistical Area. Trujillo Alto was officially founded in 1801, but gained more importance during the 20th century. Due to its proximity to the capital, San Juan, the city has become a suburb of the metropolitan area, which has sparked its growth during recent years. The population of Trujillo Alto has increased through the last century from 9,576 (1930) to 74,482 (2010). According to the 2010 Census, it is Puerto Rico's tenth-most populated municipality.In 1953–54, the Carraízo hydroelectric dam was constructed in Trujillo Alto by the Sumner Sollitt Construction Company of Chicago, under contract by the Puerto Rico Water Resources Authority. The dam forms the Loíza Lake, a reservoir which serves as the main source of the water supply for San Juan, Puerto Rico.

Quebrada Infierno is a barrio in the municipality of Gurabo, Puerto Rico. Its population in 2010 was 773.

Cuevas is a barrio in the municipality of Trujillo Alto, Puerto Rico. Its population in 2010 was 19,852.

Jaguas is a barrio in the municipality of Gurabo, Puerto Rico. Its population in 2010 was 2,083.

Dos Bocas is a barrio in the municipality of Trujillo Alto, Puerto Rico. Its population in 2010 was 8,632.