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There is a 15 paved loop that runs next to the Charles river from downtown out to Watertown. For mos of the way there is a dirt path running along side it. Great early season training rides or for a quick spin when you can't get out to the trails. Flat as a fritter so you will need your big ring. I usually head west from Back Bay on the south side of the river. Look out for other bikes, joggers, and pedestrians. It is best to avoid it during busy times so either ride early in the AM or any time after dark.
Massachusetts Outdoor Lists