sentences:  Shallow-draughted boats can use Havengore Creek to access the river, but the route needs careful preparation, as there is a lifting bridge carrying the road to Foulness Island, which is only opened for a limited period either side of high tide.In addition, Havengore Creek opens out onto Maplin Sands, and boaters must check that the Shoebury Artillery Range is not in operation before crossing the sands.The Roach passes eastwards between Foulness Island and Wallasea Island and then it turns northwards between them, where it widens to almost until it joins the River Crouch at Wallasea Ness on the Ness Hole.