The English River Thames is navigable from Cricklade or Lechlade to the sea, and this part of the river falls 71 meters (234 feet). There are 45 locks on the river, each with one or more adjacent weirs. These lock and weir combinations are used for controlling the flow of water down the river, most notably when there is a risk of flooding, and provide for navigation above the tideway.
Teddington Lock is a complex of three locks and a weir on the River Thames between Ham and Teddington in the London Borough of Richmond upon Thames, England. Historically in Middlesex, it was first built in 1810.
Caversham Lock is a lock and main weir on the River Thames in England at Reading, Berkshire. Both the lock and main weir are connected to De Bohun Island. The Thames Navigation Commissioners built the original lock in 1778. Additional sluices north of View Island and Heron Island form the whole weir complex. A footbridge passes over all three islands to connect Lower Caversham to Reading via a route other than George Street and Reading Bridge.
Marsh Lock is a lock and weir situated on the River Thames in England, about 1 mile upstream of Henley Bridge in Henley-on-Thames, Oxfordshire. The lock is close to the Berkshire bank, but accessed from the Oxfordshire side via two long walkways, the downstream one being near Mill Meadows. The first pound lock was built by the Thames Navigation Commission in 1773.
Sonning Lock is a lock and associated weir situated on the River Thames at the village of Sonning near Reading, Berkshire, England. The first lock was built by the Thames Navigation Commission in 1773 and it has been rebuilt three times since then. There is a weir a little upstream at the top of the island where Sonning Backwater separates from the main course of the river.
Whitchurch Lock is a lock and weir on the River Thames in England. It is a pound lock, built by the Thames Navigation Commissioners in 1787. It is on an island near the Oxfordshire village of Whitchurch-on-Thames and is accessible only by boat.
Shiplake Lock is a lock and weir situated on the River Thames in England between the villages of Shiplake and Lower Shiplake, Oxfordshire. It is just above the points where the River Loddon joins the Thames and Shiplake Railway Bridge crosses the river. The first pound lock was built by the Thames Navigation Commission in 1773.
Cookham Lock is a lock with weirs situated on the River Thames near Cookham, Berkshire, about a half-mile downstream of Cookham Bridge. The lock is set in a lock cut which is one of four streams here and it is surrounded by woods. On one side is Sashes Island and on the other is Mill Island connected to Formosa Island, the largest on the non-tidal Thames.
Hambleden Lock is a lock with a long weir situated on the River Thames in England, about 2 miles downstream of Henley Bridge. The lock is on the Berkshire bank between Aston and Remenham. Built by the Thames Navigation Commission in 1773, the lock is named after the village of Hambleden, a mile (1.5 km) to the north.
Boulter's Lock is a lock and weir on the River Thames in England north-east of Maidenhead town centre, Berkshire. The present 1912-built lock replaces those at this point of the river to the immediate east dating from the late 16th century and that of 1772 built by the Thames Navigation Commission. The lock is on the western side of the north-south flowing reach between the A4094 Maidenhead to Cookham road and Ray Mill Island. The name is variably used for the immediate surrounding area.
Day's Lock is a lock on the River Thames near Dorchester-on-Thames, Oxfordshire, England on the Dorchester side of the river.
Molesey Lock is a lock on the River Thames in England at East Molesey, Surrey on the right bank.
Temple Lock is a lock and weir situated on the Buckinghamshire bank of the River Thames near Temple Mill Island opposite Temple Meadows and not far from Hurley, Berkshire. It was first built by the Thames Navigation Commissioners in 1773.
Marlow Lock is a lock and weir situated on the River Thames in the town of Marlow, Buckinghamshire, England, about 300m downstream of Marlow Bridge. The first pound lock was built by the Thames Navigation Commission in 1773.
Sunbury Lock is a lock complex of the River Thames in England near Walton-on-Thames in north-west Surrey, the third lowest of forty four on the non-tidal reaches. The complex adjoins the right, southern bank about 1⁄2 mile (0.80 km) downstream of the Weir Hotel.
Penton Hook Lock is the sixth lowest lock of forty four on the non-tidal reaches of the River Thames in England. It faces an island which was until its construction a pronounced meander and is on the site of its seasonal cutoff. It is against the left bank marking the church parish medieval border of Laleham and Staines upon Thames in Surrey for many centuries. Until 1965 their county was Middlesex. At 266 ft (81 m) it is the third longest lock on the river.
Bell Weir Lock is a lock on the River Thames in England by the right bank, Runnymede which is a water meadow associated with Egham of importance for the constitutional Magna Carta. It is upstream of the terrace of a hotel and the a bridge designed by Edwin Lutyens who designed an ornamental park gate house along the reach. The bridge has been widened and carries the M25 and A30 road across the river in a single span. The lock was first built by the Thames Navigation Commission in 1817; it has one weir which is upstream. The lock is the eighth lowest of forty-five on the river and is named after the founder of the forerunner of the adjoining hotel who took charge of the lock and weir on its construction.
Old Windsor Lock is a lock on the River Thames in England on the right bank beside Old Windsor, Berkshire. The lock marks the downstream end of the New Cut, a meander cutoff built in 1822 by the Thames Navigation Commissioners which created Ham Island. The lock and a wider footbridge give access to the island. Two weirs are associated; the smaller adjoins and the larger is upstream. The lock is the ninth lowest of the forty-five on the river.
Boveney Lock is a lock on the River Thames situated on the Buckinghamshire bank opposite the Windsor Racecourse and close to Eton Wick. Boveney is a village a little way upstream on the same side. The lock was first built in 1838 by the Thames Navigation Commission. The lock was rebuilt in 1898 closer to the Buckinghamshire bank, and a set of boat rollers were installed on the old site.
Hurley Lock is a lock and weir on the River Thames in England, situated in a clump of wooded islands close to the village of Hurley, Berkshire. The lock was first built by the Thames Navigation Commissioners in 1773.
