Apart from Norton's Basin Gorge, there are no rapids in this section. Below Norton's Basin, the gorge slowly widens out into a deep valley as the river passes through Erskine Creek State Forest and the Blue Mountains National Park. The National Park finishes where Glenbrook Creek comes in on the left 2.5km upstream of the Freeway Bridge. The river is very wide in the lower stretch. The Warragamba River, which enters on the left just below Norton's Basin, can add significantly to the flow depending on water release from the dam. It is worthwhile diverting up the Warragamba, depending on flow, to view the dam. This adds another 3km to the trip. The rapids in Norton's Basin Gorge aren't numerous but have large waves and stoppers when the river is up. The last rapid can be dangerous in these conditions. There is a long pool after Wallacia Weir before the rapids begin. Wallacia Weir is at the beginning of the Gorge, following 2km of flat-water paddling from the start. It may be possible to slide or paddle craft, depending on water level, down the fish ladder.