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Powdermill Stream

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

Powdermill Stream is a stream on Ordnance Survey’s river map near Crowhurst, East Sussex, with about 6.0 km of mapped channel. On the map it flows into Watermill Stream, which flows on into Combe Haven; beyond that the map has a gap, so where it goes next is not known.

Next gauge downstream

Sheepwash Bridge on Combe Haven, about 2.4 km along the river below where Powdermill Stream ends on the map.

0.91 mAOD Tidal: rises and falls with the tide 29 min ago

No gauge measures Powdermill 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 Powdermill Stream

1 storm overflow is placed on this stream on the river map. Each status is the water company’s own monitor.

Crowhurst Ceo Not discharging
Southern Water · into Powdermill Stream · 2025: 37 spills, 85 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.

Water-sampling points on Powdermill Stream

1 Environment Agency sampling point is placed on this stream. These are dated samples taken by hand, not live readings, and FloodRadar does not grade them.

Combe Haven Pmill Stream Plough I
Last sampled 7 Sep 2026 · 24 days ago · 16 samples banked

A sample is taken on a date; it says nothing about the water today. A sample below an overflow does not by itself show where anything in it came from.

Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.

Places along it

From its source towards its mouth, the settlements within a kilometre of it on the map: Crowhurst.

On the map

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

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

Watermill Stream, the stream it joins →TN33 9AY, a postcode page near where it ends on the map (about 1.2 km 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 Powdermill 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.
Water samples are England’s only (the Environment Agency’s archive), placed 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.