175 storm overflows are traced upstream of Daldowie, the Clyde’s lowest gauge on the river map: on the Clyde itself, on its gauged tributaries, and on smaller streams that join above there.
- 0 report discharging now
- 155 not discharging
- 20 offline or silent: 20 monitor offline, 0 status unknown, 0 no live feed
Official figures for 2025, for the overflows traced upstream of Daldowie: 10,447 overflow events over 23,764 hours in total, across the 104 that have a figure. 9 had no data that year; 62 have no 2025 figure. Scottish Water counts overflow events, not the 12/24-hour spills counted in England and Wales, so this total cannot be set beside theirs.
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 Clyde 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 Abington, the Clyde’s highest gauge1 overflow
- Leadhills WwTW CSO Not discharging
Scottish Water · into Glengonnar Water · 10.8 km by river above Abington · no official annual figure
Between Abington and Sills of Clyde8 overflows
and 5 more: show all 8 overflows on this stretch → All above Sills of Clyde, nearest first →
Between Sills of Clyde and Tulliford Mill3 overflows
- Coalburn WwTW Inlet CSO Not discharging
Scottish Water · into Muir Burn · 14.7 km by river above Tulliford Mill · 2025: 105 overflow events, 1,093 h · placed on the river by its position alone - Rigside WwTW CSO Not discharging
Scottish Water · into Douglas Water · 6.6 km by river above Tulliford Mill · no official annual figure - Rigside WwTW Ssso Not discharging
Scottish Water · into Douglas Water · 6.6 km by river above Tulliford Mill · no official annual figure
Douglas Water, above Happendonjoins the Clyde above Tulliford Mill5 overflows
- Douglas, 22 Pathhead CSO Monitor offline
Scottish Water · into Douglas Water · 4.1 km by river above Happendon · no official annual figure - Douglas WwTW Ssso Not discharging
Scottish Water · into Douglas Water · 3.7 km by river above Happendon · 2025: 181 overflow events, 668 h - Douglas, Douglas STW Inlet Works CSO Not discharging
Scottish Water · into Douglas Water · 3.7 km by river above Happendon · 2025: 63 overflow events, 61 h
and 2 more: show all 5 overflows on this stretch → All above Happendon, nearest first →
Between Tulliford Mill and Hazelbank10 overflows
and 7 more: show all 10 overflows on this stretch → All above Hazelbank, nearest first →
Between Hazelbank and Blairston79 overflows
and 76 more: show all 79 overflows on this stretch → All above Blairston, nearest first →
Avon Water, above Fairholmjoins the Clyde above Blairston13 overflows
and 10 more: show all 13 overflows on this stretch → All above Fairholm, nearest first →
Nethan, above Kirkmuirhilljoins the Clyde above Blairston4 overflows
- Lesmahagow, Ne Of Parish Church CSO Not discharging
Scottish Water · into River Nethan · 4.0 km by river above Kirkmuirhill · 2025: 5 overflow events, 1.8 h - Lesmahagow Milton CSO 2004 Ns815404 Monitor offline
Scottish Water · into River Nethan · 3.8 km by river above Kirkmuirhill · 2025: 10 overflow events, 9.0 h - Lesmahagow WwTW Ssso Not discharging
Scottish Water · into River Nethan · 2.9 km by river above Kirkmuirhill · 2025: no data - Lesmahagow WwTW CSO Monitor offline
Scottish Water · into River Nethan · 2.9 km by river above Kirkmuirhill · 2025: 52 overflow events, 268 h
Between Blairston and Daldowie15 overflows
and 12 more: show all 15 overflows on this stretch → All above Daldowie, nearest first →
North Calder Water, above Calderparkjoins the Clyde above Daldowie33 overflows
and 30 more: show all 33 overflows on this stretch → All above Calderpark, nearest first →
Rotten Calder Water, above Redleesjoins the Clyde above Daldowie4 overflows
Near these gauges, connection not known
Within 3 km of one of the Clyde’s gauges in a straight line, but the river map cannot say whether their water reaches it.
- Blantyre, R/O Woodburn Ph CSO Not discharging
Scottish Water · into Un-Named Tributary Of River Clyde · 1.1 km from Blairston in a straight line · no mapped watercourse close enough to be sure · 2025: 5 overflow events, 3.3 h - Hamilton, Opp 58 John St/Public Park CSO Not discharging
Scottish Water · into Un-Named Tributary Of River Clyde · 1.1 km from Blairston in a straight line · no mapped watercourse close enough to be sure · 2025: 3 overflow events, 1.3 h - Crossford WwTW EO Not discharging
Scottish Water · into Mashcok Burn · 1.3 km from Hazelbank in a straight line · its recorded watercourse is not the one mapped beside it · no official annual figure
9 more near these gauges whose connection is not known.
10 other overflows within 3 km of these gauges are placed below the Clyde’s lowest gauge or on another river, so not listed.
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: © Scottish Water, near-real-time Overflow Map data, open licence for reuse. EDM monitors indicate overflows; they do not confirm them, and this is not advice on water quality. Annual figures for Scotland: Scottish Water overflow event data, Open Government Licence.