The South Branch Pawtuxet River is a river in the U.S. state of Rhode Island. It flows approximately .[1] There are 11 dams along the river's length.[2]
The river is formed by the confluence of the Big and Flat rivers in the area now flooded by the Flat River Reservoir in Coventry. From there, it flows east and then northeast through Coventry and the historic textile mill villages of Anthony, Quidnick, Crompton, Centreville, Arctic and River Point West Warwick where it converges with the North Branch Pawtuxet River to form the main branch of the Pawtuxet River.
Below is a list of all crossings over the South Branch Pawtuxet River. The list starts at the headwaters and goes downstream:
| Town | Carying |
|---|---|
| Coventry | South Main St. |
| Route 33 | |
| Laurell Ave. | |
| West Warwick | Pulaski St. |
| Main St. | |
| Factory St. | |
| Route 115/Route 33 |
The Mishnock River and Hawkinson Brook are the South Branch Pawtuxet River's only named tributaries, though it has many unnamed streams that also feed it.