Massena Intake (the village water supply is also drawn in through this wall). On the Grasse River end, the cement and brick structure of the old powerhouse remains, without any equipment inside the original buildings. The river from the old powerhouse onwards is calm and level to its mouth in the St. Lawrence River. This section of the river is the only section that can be traversed by motor or power boats, but activity is light as Lake St. Lawrence is the draw for boating in the area (which is behind a pair of shipping locks and two dams if one were trying to travel from the Grasse to the lake). This was only possible during the construction of the old powerhouse, as the river was dredged to along its course to the St. Lawrence. At the mouth of the Grasse River is Snell Lock, part of the St. Lawrence Seaway Shipping System. Several hundred yards upriver from the mouth of the Grasse is a docking area which contains a large floating crane with replacement doors for the locks, and the tugboat Robinson Bay, which is used for icebreaking in the spring. Pollution and environmental degradation High levels of PCB contaminate the last several miles of the Grasse, the most significant being located near the old powerhouse and at a drainage outlet on the river for the Alcoa plant located north. Alcoa has spent years cleaning this section of river. In an early attempt at cleanup, the company "capped" the river bottom so that the chemicals could not be released. This plan failed due to the weir break in the village of Massena and resulting ice flows. Before its breach, this weir had kept ice upriver longer, allowing it to melt. Since it was breached, larger pieces of ice now flow down this section of river and have breached the river bottom cap. It has also caused major erosion of the shoreline along this section of river, due to the ice gouging it out during the spring ice flows. Cleanup efforts In 2005, a company was hired by ALCOA to remove the chemicals from the riverbed near what is known as "Outfall One", one of the factory's water drainages just downriver from the powerhouse. The river bottom was removed and piped into machines where it was cleaned and deposited in a private landfill on ALCOA's property. ALCOA is also working