Not too sure how the stand-up paddle boarders impact the Back Bay bridge area for motor boats, cause there's two different sup rental, and sup class dock locations close to both sides of the bridge there:
www.divewinnipesaukee.com and
www.fullmoonpaddleboard.com? Is mostly women in bikinis, just thought I'd mention it as a heads up?
With two-way traffic, motor boats, sups, and low overhead, maybe it needs to be replaced by a drawbridge? So, how do sailboats make it through?