HERTFORD CASTLE WEIR

'Hertford Castle Weir' is a weir located in Hertford near to Hertford Castle and next to Castle Hall.
It's function is to connect the upper River Lee to the canalised section that runs through Hertfordshire, North London into the River Thames. The section of the river above Castle Weir is not deep enough to support barges or narrow boats, but is navigable by row boats, canoes and kayaks.
The weir marks the start of the River Lee Navigation, and the point where the river changes name from Lea to Lee.
It is overlooked by a function room at the Hertford Castle Hall.

Contents

Access

Weir setup

Whitewater use

See also

Access

Just off Mill Bridge (B158) in the centre of Hertford Town, beside the Castle Hall.
A small bridge runs from Mill Bridge over the secondary drop to a carpark. A step upstream from this bridge allows access to the top of the weir.

Weir setup

Castle Weir has 3 sections:

★ A vertical 70 cm drop onto a second 30 cm concrete block, situated in a stilling pool. The stilling pool overflows into a tunnel which leads under the road. The 70 cm drop has two electric gates which move verticly in high flows.

★ 5 sluice gates. Rarely used, as these are manually controlled by British Waterways. Only two of the gates work, the other two are rusted shut. Rarely more than one gate is opened.

★ Stepped drop for very high flows.

Whitewater use

Kayakers and canoeists regularly use the weir for practicing whitewater skills and playboating.

★ 'Main drop' - Can be run straight or sideways. Boofing is possible in high flows.

★ 'Main drop sluice' - Creates a jet which can tail squirts can be performed on. At high flows it makes the weir harder to paddle in, and can cause pinning in the stopper, river right.

★ 'Stilling pool drop' - Side-surfing is possible at most flows. Cartwheeling is possible when the pool level raises but this is very infrequent. Normally about 70 cm deep.

★ 'Side sluice' - A wave and stopper forms here, depending on weir pool levels and amount of water coming through the sluice. This water has been constricted by kayakers using concrete blocks to form different features. It can vary from 30-50 cm high wave which can be carved in front-surf, to a shallow retentive pour-over, which is side-surfable.

★ 'Stepped drop' - Can be run when river is in spate, very likely to do damage to the weir or your boat when the water flowing over it is less than 10cm in depth. A small wave and stopper forms at the bottom which can be played on, however, it is very shallow.

See also

★ Weirs on the River Lee

★ River Lee

★ River Lee Navigation