42 storm overflows are traced upstream of Polesworth, the Anker’s lowest gauge on the river map: on the Anker itself, on its gauged tributaries, and on smaller streams that join above there.
- 0 report discharging now
- 41 not discharging
- 1 offline or silent: 1 monitor offline, 0 status unknown, 0 no live feed
Official figures for 2025, for the overflows traced upstream of Polesworth: 671 spills over 4,026 hours in total, across all 42.
Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Anker includes the smaller streams that join it there. Where a stretch or a tributary has more than 4, the 3 discharging now or nearest its gauge are listed, the rest are counted, and every one is in that gauge’s “Upstream of here” list. Show every overflow in every stretch →
Above Nuneaton, the Anker’s highest gauge9 overflows
- Brodick Road CSO Not discharging
Severn Trent Water · into Harrow Brook · 5.2 km by river above Nuneaton · 2025: 14 spills, 38 h - Hinckley Sewage Treatment Works Not discharging
Severn Trent Water · into Sketchley Brook · 4.5 km by river above Nuneaton · 2025: 15 spills, 34 h - Hinckley - Harrowbrook Road CSO Not discharging
Severn Trent Water · into Harrow Brook · 4.2 km by river above Nuneaton · 2025: 2 spills, 13 h
and 6 more: show all 9 overflows on this stretch → All above Nuneaton, nearest first →
Between Nuneaton and Mancetter8 overflows
and 5 more: show all 8 overflows on this stretch → All above Mancetter, nearest first →
Between Mancetter and Polesworth8 overflows
and 5 more: show all 8 overflows on this stretch → All above Polesworth, nearest first →
River Sence, above Temple Milljoins the Anker above Polesworth17 overflows
- Odstone Sewage Pumping Station Not discharging
Severn Trent Water · into Tributary Of River Sence · 6.7 km by river above Temple Mill · 2025: 2 spills, 0.9 h - Market Bosworth STW Not discharging
Severn Trent Water · into Carlton Brook · 4.3 km by river above Temple Mill · 2025: 35 spills, 315 h · placed on the river by its position alone - Congerstone Pumping Station Not discharging
Severn Trent Water · into River Sence · 2.0 km by river above Temple Mill · 2025: 8 spills, 83 h
and 14 more: show all 17 overflows on this stretch → All above Temple Mill, nearest first →
Near these gauges, connection not known
Within 3 km of one of the Anker’s gauges in a straight line, but the river map cannot say whether their water reaches it.
- Atherstone Sewage Treatment Works Not discharging
Severn Trent Water · into Tributary Of River Anker · 1.5 km from Mancetter in a straight line · no mapped watercourse close enough to be sure · 2025: 42 spills, 138 h - Atherstone Sewage Treatment Works Not discharging
Severn Trent Water · into Tributary Of River Anker · 1.5 km from Mancetter in a straight line · no mapped watercourse close enough to be sure · 2025: 47 spills, 211 h - Shuttington - Shuttington Outfall (CSO) Not discharging
Severn Trent Water · into Trb River Anker · 2.5 km from Polesworth in a straight line · its watercourse is not on the river map · 2025: 4 spills, 2.1 h
1 more near these gauges whose connection is not known.
A status is the water company’s own monitor: it says whether an overflow is discharging, never how much or why, and a spill does not by itself explain a change in a river level. A status older than two hours is shown as unknown. Annual figures are the official returns: 12/24-hour spills for England and Wales, overflow events for Scotland (Scottish Water counts differently, so the two cannot be compared). “No data” means the monitor produced no usable data that year, not zero. Overflows are placed on OS Open Rivers (edition 2026-04), which leaves out many small channels: an overflow the map cannot place may still drain here. Contains OS data © Crown copyright and database rights 2026. Sewage in Britain’s rivers →
Live status: © Severn Trent Water storm overflow activity data, licensed under CC BY 4.0. Annual figures for England: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence v3.0.