Dredging of the South River beneath the Sea Street Bridge is nearly complete and expected to wrap up this week, Harbormaster Michael DiMeo said. It began Oct. 29. State-funded work in 2009 made the bridge’s piers farther apart, but the sediment below was not dredged, leaving a hazard for navigation and for any swimmer who jumps — albeit illegally — from the bridge into water that is deceptively shallow, he said. Marshfield received $200,000 from the Department of Conservation and Recreation for the project. The cost jumped to $265,000 when the town discovered that wooden pilings had been cut off and left in place below the sediment, he said. The balance of the money came from the town. The dredged material is being placed on Rexhame Beach. Full story for BostonGlobe.com subscribers.
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