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Home › Rivers › River Croal › River Tonge

River Tonge

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

The River Tonge is a stream on Ordnance Survey’s river map near Mill Hill, Bolton, with about 4.7 km of mapped channel. On the map it flows into the River Croal, which flows on into 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 2.5 km along the river below where the River Tonge ends on the map.

0.09 m Normal · steady 30 min ago

After that, Kearsley, about 5.0 km along the river.

No gauge measures the River Tonge 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 the River Tonge

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

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.

Water-sampling points on the River Tonge

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

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: Back o' th' Bank, Brownlow Fold, Tonge Moor, Mill Hill, Tonge Fold, Oaken Bottom, Darcy Lever, Burnden.

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 the River Tonge; grey lines are other mapped watercourses. Lines from OS Open Rivers (edition 2026-04).

Rivers and streams: OS Open Rivers. Contains OS data © Crown copyright and database rights 2026.

Streams flowing into it

The River Croal, the river it joins →BL3 1RP, a postcode page near where it ends on the map (about 80 m away) →All rivers with gauges →

What this page can and cannot tell you

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