 North of this point the area becomes more rugged and there are no picnic areas until the Tunks Hill (previously known as Tunks Farm) area which is away from the river behind the garden nursery on Lane Cove Road.A weir was constructed in the 1930s near Fullers Bridge which converted the middle section of the river from tidal salt-water to a fresh-water area with constant water level suitable for recreational use in rowing boats and canoes.This area was managed by a trust and was called Lane Cove River Park.