Welcome to the Charles River Alliance of Boaters (CRAB) website.
We are a coalition of individuals and organizations that use the Charles River from Watertown Square to the Charles River Dam.

CRAB organizations offer a wide range of boating experiences for all boating interests from sightseeing to Olympic training. Whether your interest is with an oar, paddle, sail, motor, or even helping to keep the river clean, CRAB organizations can provide what you need.

Our mission is to encourage safe and accessible boating by the entire community on the Lower Basin of the Charles. This includes power boaters, sailors, rowers, paddlers, and others, working together to keep the Charles River a healthy resource for the enjoyment of boaters and park users alike. A cornerstone of our effort is the development of better avenues of communication between and among this diverse community of users. The intent of this web site is to gather a lot of diverse information in one place that can be easily accessed by everyone who uses or wants to use the river.


In partnership with the MIT Sea Grant College Program, CRAB has created a detailed chart of the river depth between the New Charles River Dam and the Watertown Dam. Both on-line and hardcopy versions of the chart are freely available to the public.

We need your help to allow us to continue to measure changes in the river bottom and to further refine the charts. The focus of our current work is to compare our current measurements to historical measurements done by others and document changes in the river bottom.

Please make a contribution to support the Chart Project. Thanks in advance for your support!!!