Day's Lock

Day's Lock
Day's Lock[1]
Day's Lock[1]
Sculler waits to enter Day's Lock while a cruiser tries to come out sideways
Waterway River Thames
County Oxfordshire
Maintained by Environment Agency
Operation Hyrdaulic
First built 1789
Latest built 1925
Length 154’ 10” (46.93m)
Width 21’ 2” (6.45m)
Fall 5’ 2” (1.58m)
Above sea level 149'
Distance to
Teddington Lock
76 miles
Geographical Data
Coordinates 51°38′18″N 1°10′45″W / 51.63834°N 1.17919°W / 51.63834; -1.17919Coordinates: 51°38′18″N 1°10′45″W / 51.63834°N 1.17919°W / 51.63834; -1.17919
[v · d · e]Day's Lock
Urban straight track
River Thames
Unused waterway turning from left Unused transverse waterway Unknown BSicon "uWEIRl"
Unknown BSicon "uSTRfl" Urban straight track
Long Wittenham
Unknown BSicon "ueABZrg" Unused transverse waterway weir with flow to left Waterway with unused branch to right
Urban straight track Unknown BSicon "uFGATEu"
Clifton Lock
Waterway turning to left Urban transverse track Unknown BSicon "uABZlg"
Waterway under minor road
Clifton Hampden Bridge
Urban straight track
Unused waterway turning from left Waterway with unused branch to right
Unknown BSicon "uxWEIRg" Unknown BSicon "uFGATEu"
Day's Lock
Unknown BSicon "uxJUNCld" Waterway T-junction to right
Unused waterway under track or footbridge Waterway under track or footbridge
Little Wittenham Bridge
Unused waterway turning left Unknown BSicon "ueABZlg"
Urban straight track
River Thames

Day's Lock is a lock on the River Thames near Dorchester-on-Thames, Oxfordshire, England on the Dorchester side of the river.

The pound lock was built in 1789 by the Thames Navigation Commissioner. The lock is across the river from the small village of Little Wittenham and is overlooked from the south by the hills of Wittenham Clumps, with a particularly good view from Round Hill.

The weir runs straight across the river from the other side of the lock island.

Day's Lock is the main gauging station for the measurement of the water flow in the River Thames.

The World Poohsticks Championships, on behalf of the RNLI, have taken place annually here since 1983.



The name Day's Lock comes from the Day family, local Catholic yeomen since the 17th century. During the 16th century, there was a flash lock here. The pound lock was staked out in August 1788. It was judged best to build it on the Oxfordshire bank provided the existing weir owner would "remove his bucks"(eel traps). In 1865 it was reported to be in utter ruin and dangerous, but reconstruction did not take place until 1871. In 1882 a bell push to summon the keeper was installed, there being no lock keeper's house at that time.[2] The lock house was not built until 1928 when it was erected on Lock House Island next to Little Wittenham Bridge.

Access to the lock

A short way downstream of the lock is Little Wittenham Bridge which spans the river in two sections with an island between. Using this, the lock is a short walk from Little Wittenham where is a car park near St Peter's Church. The lock is a little further to walk to from Dorchester.

Reach above the lock

View from Round Hill. Day's Lock and the River Thames curving along the tree line to the left

On the eastern bank to the north-east is the historic town of Dorchester with its ancient Abbey. The river follows a long bend round to Clifton Hampden. Here it goes under Clifton Hampden Bridge and past the historic Barley Mow public house, as mentioned in the book, Three Men in a Boat. Before Clifton Lock, the old stream separates, leading to Long Wittenham.

There are navigation transit markers upstream of the lock to allow boats to check their speed. A powered boat should take more than one minute to pass between the markers.

The Thames Path follows the western/southern bank to Clifton Hampden Bridge, where it crosses to the opposite northern bank to continue to Clifton Lock.

See also

Moore Bridge.jpg UK Waterways portal
  • Locks on the River Thames
A paddle-driven river management craft enters the lock from upstream. Round Hill and Little Wittenham Bridge are in the background


  1. ^ Statistics from Environment Agency A User's Guide to the River Thames:Part II
  2. ^ Fred. S. Thacker The Thames Highway: Volume II Locks and Weirs 1920 - republished 1968 David & Charles

External links

Next lock upstream River Thames Next lock downstream
Clifton Lock
2.98 miles
Day's Lock
Grid reference: SU569936
Benson Lock
3.96 miles
Next crossing upstream River Thames Next crossing downstream
Clifton Hampden Bridge (road) Day's Lock Little Wittenham Bridge (pedestrian)
Next crossing upstream Thames Path Next crossing downstream
southern bank
Clifton Hampden Bridge
Day's Lock northern bank
Benson Lock

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