Shifford Lock Tail Gauge Pile Zero appears to be in error by some 36cm.
As it stands the downstream reach shows a negative drop 29% of the time.
The Qr99% figure is -0.36m. So in the diagram though the ODN figures remain as per EA the actual levels
are depicted + 36cm.
As it happens the EA also now say that the TGPZ for Northmoor is now 62.182 which would mean the error correction would have to be 58cm. So I have chosen to ignore it.
My apologies if I have misunderstood something.
Shifford Lock at VisitThames
Left bank, tel: 01367 870247, drop 7'4", length: 113'8", width: 15'1"
Lock keeper: Keith Minns
Camping: Up Duxford weir stream. Badgers Bank, Duxford
Shyffordesfery near Longeworth the fferybarge to be maintained by the abbot of Eynsham.
1859: The Thames, Mr & Mrs Hall
[ No lock in 1859 - they would have just shot the weir ]
A stone's throw from the river, a small cluster of houses, scarcely to be called a village, points out the site of ancient Siford, or Shefford; yet, on this lonely and isolated spot, now apparently far removed from human intercourse, the great Alfred held one of his earliest parliaments.
There sate, at Siford, many thanes, many bishops,
and many learned men, proud earls and awful knights.
There was Earl Alfric, very learned in the law,
and Alfred, England's herdsman — England's darling.
He was king in England:
he began to teach them, as we may hear
( i.e. as we shall hear in what follows ),
how they should live."
*The poem, of which this is the commencement, has been printed in the "Reliquae Antiqua" vol.I. p.170.
What a dream might have been enjoyed, resting under a hayrick the mowers had raised in a corner of the meadow in which this memorable event is said to have taken place !
1896: Shifford Lock built.
1909: Shifford Lock in The Stripling Thames by Fred Thacker
[Shifford Lock] can present a picture of the bleakest misery in the cold rain and blustering wind
of an unseasonable August. The Southwest always seems to rage down between the tall reeds
that line the narrow course, as though the wind had a perpetual appointment here with the devil ...
What a long chase I once had after an absurd panama, elusive, half sunken, my craft almost unmanageable under the rioting gale.
1910: This section in Thames Valley Villages by Charles G Harper
1920: Fred Thacker -
The present [Shifford] Lock is the newest
foundation on the river;
it was not even discussed before April 1896.
The lock cut was engineered in part from an
old side channel. The weirs at its head
and against the lock are both entirely modern.
Towards the end of 1896 the Ecclesiastical Commissioners, in view of the approaching completion of the lock, interceded on behalf of certain of their tenants at Chimney, who had been in the habit of going to church by water: I presume at Shifford. The Conservancy granted free lock passes for the purpose.
Fred Thackers Map, 1920.