River entrance surveys
The department conducts biannual surveys of river entrances in order to assess shoaling and water depths within navigation channels. These regular surveys inform waterway users of river entrance conditions as well as to inform government on the need to consider dredging.
Crown Lands undertakes regular bed level surveys of the Richmond River entrance to assess water depths against design navigation criteria of at least 4 metres at low tide established with local commercial vessel operators. These surveys indicate that the water depth requirements of local waterway users have generally been maintained from 2012.