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No striped bass today, but plenty of smallmouth bass to be found in the shallows. It is real mystery to me where they smallmouth bass go after the herring run. I know that several of them hang out under the Mass. Ave. Bridge.
They can also be found at the entry point of the mud river near Fenway Park. Very randomly I have found them in different parts of the river. One thing I have noticed is that largemouth bass population is actually not that large the closer you get the dam.
I would actually suggest fishing many miles down the river around Waltham and Needham. There is deeper water there in a smaller area. You will also find some more selection in other rivers like the Concord and the Assabet.