List of rivers of Ponce, Puerto Rico

This list of rivers of Ponce consists of the 14 rivers in the municipality of Ponce, Puerto Rico. Rivers that either originate in the municipality or that run the bulk of their course through said municipality are listed. Except for two rivers, Río Portugués and Río Jacaguas, all other rivers originate and terminate within the boundaries of the municipality of Ponce. This list does not include quebradas (English: brooks). Only streams recognized as "rivers" by the United States Geological Survey and the Puerto Rico Department of Natural and Environmental Resources are included here.

All the rivers in the municipality of Ponce run into one of four river basins that then empty into the Caribbean Sea.^[1] These four river basins are: Río Matilde, Río Bucaná, Río Inabón, and Río Jacaguas.

Río Pastillo and Río Canas merge to form Río Matilde. Río Blanco, Río Prieto, Río San Patricio, Río Bayagán, Río Cerrillos, Río Chiquito, and Río Portugués all run in one manner or other into Río Bucaná. Río Anon feeds into Río Inabón (Río Guayo also feeds into Río Inabón, but Río Guayo is not located in the municipality of Ponce). Río Jacaguas is actually shared between the municipalities of Ponce and Juana Díaz, as it forms the boundary between the two municipalities. Various rivers feed into Río Jacaguas, but none of them are located within the municipality of Ponce.

Two rivers, Río Bucaná and Río Portugués, are partially canalized. These canalization occur in parts of the urban area of the city of Ponce. Additionally, two rivers have been dammed: Río Cerrillos was dammed to create the Cerrillos Lake, and the damming of Río Portugués is expected to create the Portugués Lake^[2] when the project is completed in 2013.^[3] The damming of Río Cerrillos occurred north of the point where Río Bayagán feeds into Río Cerrillos but south of where Río San Patricio feeds into Río Cerrillos.

No.	Name	Elevation at Origin (feet)	Elevation at Mouth (feet)	River Length (km)	Watershed Area (sq mi) (0= Not Applicable [*])	Discharge (cu ft/s) (0= Not Available)	Approximate Distance from Mouth to Shore(km)	Photo
1	Río Anón	3,854	1,060	4.0	0	0	12.0
2	Río Bayagán	141	42	9.0	0	0	4.0
3	Río Blanco	2,970	1,381	2.0	0	0	16.0
4	Río Bucaná	115	0	9.16	28.45	0	0
5	Río Canas	930	15	14.0	0	0	1.7
6	Río Cerrillos	1,200	69	29.8	17.80	24,000	5.0
7	Río Chiquito	1,170	98	9.5	0	0	3.0
8	Río Inabón	4,100	0	32.01	38.18	15,000	0
9	Río Jacaguas	2,099	0	39.72	59.85	37,000	0
10	Río Matilde	15	0	1.7	0	0	0
11	Río Pastillo	435	15	19.0	0	0	1.7
12	Río Portugués	2,853	3	29.66	20.33	16,000	2.0
13	Río Prieto	3,920	1,381	4.0	0	0	14.0
14	Río San Patricio	1,917	660	6.3	0	0	7.0

[*] = When the watershed area for a river appears as "Not Applicable", the river is itself part of another river's watershed area.

• Río Anón
• Río Bayagán
• Río Blanco
• Río Bucaná
• Río Canas
• Río Cerrillos
• Río Chiquito
• Río Inabón
• Río Jacaguas
• Río Matilde
• Río Pastillo
• Río Portugués
• Río Prieto
• Río San Patricio

Listed according to the latitude at the mouth of the river:

• Río Pastillo - at 66.6404508 W
• Río Canas - at 66.6404508 W
• Río Chiquito - at 66.6135062 W
• Río Blanco - at 66.6079505 W
• Río Prieto - at 66.6079505 W
• Río San Patricio - at 66.6068395 W
• Río Bucaná - at 66.5998946 W
• Río Bayagán - at 66.5857282 W
• Río Matilde - at 66.5798949 W
• Río Portugués - at 66.5798949 W
• Río Anón - at 66.5798949 W
• Río Cerrillos - at 66.5798949 W
• Río Inabón - at 66.5582270 W
• Río Jacaguas - at 66.5393380 W

This lists the rivers in order of their longitude or, roughly, where the river's mouth is relative to the Ponce shore:

• Río Matilde
• Río Bucaná
• Río Inabón
• Río Jacaguas

• Río Pastillo - at 18.0019106 N
• Río Canas - at 18.0019106 N
• Río Chiquito - at 18.0330201 N
• Río Bayagán - at 18.0435751 N

• Río San Patricio - at 18.1177384 N
• Río Portugués - at 18.1319046 N
• Río Anón - at 18.1319046 N
• Río Cerrillos - at 18.1319046 N

• Río Blanco - at 18.1438485 N
• Río Prieto - at 18.1438485 N

• List of rivers of Puerto Rico

• Fay Fowlie de Flores. Ponce, Perla del Sur: Una Bibliográfica Anotada. Second Edition. 1997. Ponce, Puerto Rico: Universidad de Puerto Rico en Ponce. p. 193. Item 993. LCCN 92-75480
• United States. Ponce Regional Water Resources Management Study. Washington, D.C.: s.n. 1974. (PUCPR)

• Geology and Hydrogeology of the Caribbean Islands Aquifer System of the Commonwealth of Puerto Rico and the U.S. Virgin Islands: Regional Aquifer-System Analysis. ROBERT A. RENKEN, W.C. WARD, I.P. GILL, FERNANDO GÓMEZ-GÓMEZ, JESÚS RODRÍGUEZ-MARTÍNEZ, et al. USGS. Professional Paper 1419. Reston, Virginia. 2002. Accessed 13 November 2019.
• USGS Geographic Names Information Service
• USGS Hydrologic Unit Map – Caribbean Region (1974)
• Los Rios. Hojas de Nuestro Ambiente. February 2007: P013. Page 2. Puerto Rico Department of Natural and Environmental Resources. Retrieved 30 October 2011.
• Guia de Saltos y Caidas de Agua de Puerto Rico. Gobierno de Puerto Rico. Departamento de Recursos Naturales y Ambientales. Division del Monitoreo del Plan de Aguas, Secretaria Auxiliar de Planificacion Integral. San Juan, Puerto Rico. Carmen R. Guerrero Pérez, Secretaria Estatal del Departamento de Recursos Naturales y Ambientales. Edited by Ivelisse Pérez Rodríguez, Nervalis Medina Echevarría, Aurielee Díaz Conde, and Marianela Torres Rodríguez. 2016. 181 pages. Archived.