A concrete foundational shaft sits on the western bank of the Seekonk River. It will be drilled into the soil this fall as part of construction on a new westbound Washington Bridge. (Photo by Nancy Lavin/Rhode Island Current)If seeing is believing, the single foundation shaft resting on the bank of the Seekonk River below an open sky where the westbound Washington Bridge once loomed offers little reassurance. Nor does Gov. Dan McKee’s repeated p…