The Barrington River is a tidal river in Barrington, Rhode Island, flowing into Hundred Acre Cove and ultimately Narragansett Bay. It is a saltwater estuary characterized by a broad, shallow cove to the north and a narrower river channel to the south. The primary public access for paddlers is the Walker Farm Public Boat Ramp, which provides a hard-surface ramp and a gravel beach suitable for hand-carried craft like kayaks, canoes, and paddleboards. This ramp has a parking lot with space for trailers. A secondary, less developed access point is the Wamsetta Avenue town right-of-way, designated for hand-carry launching only. The Barrington Commuter Rail Station is also a possible launch point farther south along the river.

Paddlers must plan their trips around significant tidal currents. The tide runs very strongly through the narrow sections of the river, particularly under bridges like the Massasoit Avenue bridge, making these areas treacherous for small boats. Currents can shift quickly from slack water to very strong flows, so caution is essential near any bridge. The river provides access to two distinct environments. Heading north from the Walker Farm ramp leads into the expansive, shallow Hundred Acre Cove, a large tidal estuary containing several small marsh islands and a peninsula called "The Tongue." This area is largely protected open space. Heading south follows the Barrington River as it narrows and winds through countryside before meeting the Warren River, which leads to Narragansett Bay.

The area is ecologically significant as part of the third-largest salt marsh estuary in Rhode Island. It supports important breeding populations of birds like the clapper rail and saltmarsh sparrow and is the site of the only known breeding population of diamondback terrapins in the state. Paddlers should be mindful of wildlife, especially nesting areas. The best seasons for paddling are generally from spring through fall, with March through November cited as a good window. The site is adjacent to the East Bay Bike Path. The overall paddling experience is suitable for beginners in the protected cove, but the strong tidal currents in the river channel require greater skill and careful timing.