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Seamer Drain

A stream near Irton, North Yorkshire. No gauge of its own: what the river map and the banked data say about it.

Seamer Drain is a stream on Ordnance Survey’s river map near Irton, North Yorkshire, with about 4.7 km of mapped channel. On the map it flows into the River Hertford, which flows on into the River Derwent, then the River Ouse, then the River Humber and out to the sea.

Next gauge downstream

Low Marishes on the River Derwent, about 18 km along the river below where Seamer Drain ends on the map.

1.11 m Normal · steady 30 min ago

After that, Malton, A64 Road Bridge, about 25 km along the river.

No gauge measures Seamer Drain 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 Seamer Drain

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

Seamer Sewage Treatment Works Not discharging
Yorkshire Water · into Seamer Drain · 2025: 5 spills, 36 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: © Yorkshire 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 Seamer Drain

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.

Seamer Drain at Binnington
Last sampled 13 Jul 2026 · 3 months ago · 28 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.

On the map

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

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

The River Hertford, the stream it joins →YO13 9QX, a postcode page near where it ends on the map (about 1.8 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 Seamer Drain 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.