The exact turn-around of the race in the upper reaches of the river may vary slightly, but the basic course is as follows: Paddle 3 miles upriver to the end of the navigable part of the river, return downriver 5 miles past the start to near where the river empties into Narragansett Bay, then finish 2 miles back upriver to the start/finish.
Depending on the tide, the Narrow River can be quite shallow in parts. While most of the bottom is sandy/muddy, beware of rocks around Middlebridge Road Bridge.
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