(Jamestown, RI)--The Rhode Island Department of Environmental Management is announcing the closure of the perimeter loop around the Beavertail State Park lighthouse to vehicle traffic.This takes effect on Monday.The DEM says residual damage from Superstorm Sandy and erosion and storm surge intensified by climate-driven sea level change have caused dangerous washouts to the road and surrounding pedestrian path to the Jamestown property.The department says the lighthouse and surrounding area will still be accessible to pedestrians.