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Dean Brook

A stream near Johnson Fold, Bolton. No gauge of its own: what the river map and the banked data say about it.

Dean Brook is a stream on Ordnance Survey’s river map near Johnson Fold, Bolton, with about 5.0 km of mapped channel. On the map it flows into Astley Brook, which flows on into the River Tonge, then the River Croal, then the River Irwell; beyond that the map has a gap, so where it goes next is not known.

Next gauge downstream

Farnworth on the River Croal, about 9.1 km along the river below where Dean Brook ends on the map.

0.09 m Normal · easing 30 min ago

After that, Kearsley, about 12 km along the river.

No gauge measures Dean Brook 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 Dean Brook

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

Brook Deans Close CSO Not discharging
United Utilities · into Dean Brook · 2025: 6 spills, 17 h
D/S 56 Barrow Bridge Road CSO Not discharging
United Utilities · into Dean Brook · 2025: 2 spills, 2.2 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: © United Utilities 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: Johnson Fold, Cope Bank, Smithills, Sharples, Halliwell.

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 Dean Brook; grey lines are other mapped watercourses. Lines from OS Open Rivers (edition 2026-04).

Astley Brook, the stream it joins →BL1 3LU, a postcode page near where it ends on the map (about 90 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 Dean Brook 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.