Río Cerrillos

Cerrillos River
Cerrillos River near the Lake Cerrillos Dam
Country	Puerto Rico
City	Ponce
Basin features
Main source	Barrio Anón 1,200 feet (370 m)
River mouth	Río Bucaná 69 feet (21 m)
Progression	Anón Maraguez Cerrillos
River system	Río Bucaná
Basin size	17.80 sq mi (46.1 km2)
Tributaries	Left: Río Bayagán Quebrada Ausubo Río San Patricio Right: Río Prieto
Physical characteristics
Length	18.5 miles (29.8 km)
Discharge	Average rate: 24,000 cu ft/s (680 m3/s)

Cerrillos River (Spanish: Río Cerrillos) is a river in the municipality of Ponce, Puerto Rico. Río Cerrillos has its origin in barrio Anón and runs south until it feeds into Bucaná River. Río Cerrillos is commonly known by the locals as Maragüez River, because most of its course runs through Barrio Maragüez. This river is one of the 14 rivers in the municipality. The river has a discharge of 24,000 cubic feet per second, making it the second most affluent river in the municipality after Río Jacaguas.

From its origin about 1 kilometer south of the intersection of PR-139 and PR-143, Río Cerrillos runs south for 1.8 kilometers where it is fed by Río Prieto west of PR-139. From this point on, Rio Cerrillos runs parallel to PR-139 for 2 kilometers in barrio Anón before reaching barrio Maraguez. Continuing on its southernly course for about 1.2 kilometers, Río Cerrillos is fed by Río San Patricio. Five kilometers further downstream Río Cerrillos forms Lake Cerrillos, as a result of its dam. Flowing out of the Cerrillos dam, Río Cerrillos runs south for 1 kilometer until it enters barrios Machuelo Arriba and barrio Cerrillos, being the boundary between the two barrios. The river continues its southern course parallel to PR-139 for 5 kilometers until it reaches PR-5139. In another kilometer downstream it is fed by Quebrada Ausubo, and another kilometer further south it is fed by Río Bayagán. At this point it feeds into Río Bucaná where it terminates.