[5] This river feeds into Río Portugués in the sector called Parras,[6] about 0.5 km (0.3 mi) north of the intersection of PR-504 and PR-505.

[10] It forms in the area north of Camino Paseo del Río and west of Camino Paseo Panorámico II, in south central Montes Llanos, about half kilometer west of PR-505, and approximately 1 mile (1.6 km) north of the northern terminus of PR-504.

After this, the river is found next to the western edge of PR-588, also known as Camino Río Chiquito, until PR-588 comes to its southern terminus where it meets PR-504.

From this point onward Río Chiquito runs southward along the western edge of PR-504[13] for approximately 600 meters (2,000 ft) until it crosses PR-504 eastward.

The former course of Río Chiquito, prior to being diverted by the US Army Corps of Engineers, followed from the area just east of PR-504, at N 18.04262 W 66.60911, and headed southeast crossing Avenida Federal (aka, Calle A), and continued southeast for some 500 feet (150 m) after which it took a southerly turn before crossing today's PR-10 (PR-10 had not been built then).