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Horsted Keynes Stream

A stream near Horsted Keynes, West Sussex. No gauge of its own: what the river map and the banked data say about it.

Horsted Keynes Stream is a stream on Ordnance Survey’s river map near Horsted Keynes, West Sussex, with about 1.8 km of mapped channel. On the map it flows into Cockhaise Brook, which flows on into the River Ouse and out to the sea.

Next gauge downstream

Freshfield Bridge on the River Ouse, about 7.2 km along the river below where Horsted Keynes Stream ends on the map.

-0.03 mASD Normal · easing 30 min ago

After that, Goldbridge, about 16 km along the river.

No gauge measures Horsted Keynes Stream itself. A gauge downstream shows water that has already passed it, mixed with everything else that has joined on the way, so it says nothing exact about this stream.

Storm overflows on Horsted Keynes Stream

2 storm overflows are placed on this stream on the river map. Each status is the water company’s own monitor.

Horsted Keynes WwTW Not discharging
Southern Water · into Cockhaise Brook · 2025: 0 spills, 0 h
Horsted Keynes WwTW Not discharging
Southern Water · into Cockhaise Brook · 2025: 11 spills, 78 h

A status says whether an overflow is discharging now, never how much or why. A monitor that is offline or has not reported is not “not discharging”. Sewage in Britain’s rivers →

Live status: © Southern Water storm overflow activity data, licensed under CC BY 4.0. Annual spill figures: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence (OGL) v3.0.

Places along it

From its source towards its mouth, the settlements within a kilometre of it on the map: Horsted Keynes, Cinder Hill.

Place names: OS Open Names. Contains OS data © Crown copyright and database rights 2026.

On the map

The map needs JavaScript. Everything it shows is listed on this page.

The blue line is Horsted Keynes Stream; grey lines are other mapped watercourses. Lines from OS Open Rivers (edition 2026-04).

Cockhaise Brook, the stream it joins →RH17 7EL, a postcode page near where it ends on the map (about 540 m away) →All rivers with gauges →

What this page can and cannot tell you

Its line, its name and where it flows come from Ordnance Survey’s river map (OS Open Rivers, edition 2026-04), which leaves out many small streams, ditches and culverts. “Flows into” is the map’s word: a channel that is not on the map is not shown here, which does not mean it is not there.
No gauge measures Horsted Keynes Stream itself, so its own level is not known here.
Storm overflows are listed only where the river map places them on this stream; an overflow it could not place is not counted.
No water-sampling point with a banked sample is placed on this stream. Only England’s samples are banked, and only where the map can place their sampling point.
Nothing on this page says whether any place floods. For an address, see its postcode page.

This uses Environment Agency flood and river level data from the real-time data API (Beta). Licence: Open Government Licence v3.0.