The Gloucester Harbour Trustees are the Competent Harbour Authority (CHA) for the tidal part of the River Severn from the Gloucester weirs (Llanthony & Maisemore) down to seaward of the Second Severn Crossing, on the Welsh side of the Severn Estuary (north of Denny Island) from the Second Severn Crossing as far as Goldcliff, and on the River Wye up to its tidal limit (Bigsweir).
The Trustees have responsibilities for navigational safety in that part of the estuary, and maintain a number of navigation aids (beacons, buoys and lighthouses), and a special 'Pilotwatch Radar' with portable sets for use by pilots. They also arrange the provision of pilots which are compulsory for most commercial shipping and other vessels over 30m l.o.a. in the GHT area. The main commercial traffic within the GHT area is to the port of Sharpness, and some sand dredging. The harbour, which has one of the world's highest tidal ranges, includes both the present road crossings and two riverside nuclear sites (one at Oldbury decommissioning, one at Berkeley decommissioning).
The Trustees were originally constituted in 1890 and initially comprised some 22 Trustees. Today the board consists of 10 members, who are appointed in line with the principles of the ‘Guide to Good Governance’ drawn up as part of the DETR’s Review of Trust Ports and in accordance with the provisions of the Gloucester Harbour Revision (Constitution) Order 2002 (which also sets out the boundaries of the Gloucester Harbour). The Gloucester Harbour Trustees, as competent harbour authority for this part of the river, have issued safety guidance for surfers, canoeists, small craft and river bank users in relation to the Severn bore, a phenomenon of the Severn Estuary and lower parts of the river under certain tidal conditions.