Quebrada Negrito

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

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

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.

Loíza Lake, or Lago Loíza, is a reservoir located in the municipality of Trujillo Alto, Puerto Rico. It was formed by construction of the Carraízo Dam on the Río Grande de Loíza. It serves as the main water supply source of the San Juan metropolitan area.

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

Quebrada Grande is a barrio in the municipality of Trujillo Alto, Puerto Rico. Its population in 2010 was 4,376.

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

Masa is a barrio in the municipality of Gurabo, Puerto Rico. Its population in 2010 was 1,522.

Cacao is a barrio in the municipality of Carolina, Puerto Rico. Its population in 2010 was 4,214.

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.

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

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.