Overflow history upstream of River Lune, Crook o' Lune, Caton
The spot's forecast · For event organisers
This page lists the monitored storm overflows upstream of this spot and how often each spilled in each year. It is not a water test, and it does not say whether the water is fit to swim in. It does not include farm runoff, misconnected drains, treated sewage effluent, wildlife or overflows without a monitor. A year's count depends on how long the monitor worked, shown as monitor uptime.
Each year, all overflows upstream
| Year | Overflows with a return | Spills | Spill hours | Spill hours, weighted by reach |
|---|---|---|---|---|
| 2021 | 21 | 1,245 | 11,584 | 477 |
| 2022 | 21 | 1,270 | 12,121 | 140 |
| 2023 | 26 | 1,937 | 19,108 | 1,857 |
| 2024 | 26 | 1,659 | 13,807 | 2,098 |
| 2025 | 26 | 1,295 | 9,219 | 1,103 |
Reach is the share of a spill's bacteria SwimSignal's model expects to arrive here, after die-off on the way and dilution by the river. Weighting by it counts an hour of spilling just upstream for far more than one 40 km away. Spills are counted by the Environment Agency's 12/24 method: any discharge in the first 12 hours counts as one spill, then one more for each 24 hours with any discharge. How reach is worked out.
The overflows, by reach
All 26, the one whose spills matter most here first. Hours away is how long sewage takes to arrive at the model's river speed.
| Overflow and id | Company | km upstream | Hours away | Reach | Spills 2023 | Spills 2024 | Spills 2025 | Spill hours 2025 | Monitor uptime 2025 |
|---|---|---|---|---|---|---|---|---|---|
| Caton sewage works overflow Caton WwTW · UUP00427 | United Utilities | 1.0 | under 1 | 95% | 96 | 134 | 83 | 838 | 100% |
| Thurtell Cottages storm overflow Thurtell Cottages CSO · UUP01941 | United Utilities | 1.0 | under 1 | 95% | 41 | 39 | 35 | 65 | 83% |
| Kirkby Lonsdale sewage works overflow Kirkby Lonsdale WwTW · UUP01078 | United Utilities | 21.3 | 12 | 20% | 60 | 65 | 60 | 87 | 100% |
| Kirkby Lonsdale sewage works overflow Kirkby Lonsdale WwTW · UUP01077 | United Utilities | 21.3 | 12 | 20% | 61 | 66 | 68 | 351 | 100% |
| Casterton sewage works overflow Casterton WwTW · UUP00418 | United Utilities | 23.6 | 13 | 18% | 14 | 2 | 0 | 0 | 68% |
| Hornby sewage works overflow Hornby WwTW · UUP00989 | United Utilities | 10.1 | 6 | 15% | 29 | 31 | 21 | 0 | 100% |
| Low Bentham sewage works overflow LOW Bentham WwTW · UUP01194 | United Utilities | 17.4 | 10 | 6% | 0 | 100 | 42 | 129 | 100% |
| Wray (Wrayz) sewage works overflow Wray Wastewater Treatment Works (Wrayz) (017270020) · UUP02179 | United Utilities | 13.2 | 7 | 6% | 181 | 39 | 90 | 368 | 100% |
| High Bentham sewage works overflow High Bentham WwTW · UUP00954 | United Utilities | 20.5 | 11 | 5% | 115 | 81 | 77 | 131 | 99% |
| High Bentham sewage works overflow High Bentham WwTW · UUP00955 | United Utilities | 20.5 | 11 | 5% | 97 | 140 | 80 | 671 | 100% |
| Burton-in-Lonsdale sewage works overflow Burton-IN-Lonsdale WwTW · UUP00377 | United Utilities | 21.5 | 12 | 4% | 98 | 95 | 78 | 165 | 100% |
| Hindburn Bridge pumping station overflow Hindburn Bridge PS · UUP00313 | United Utilities | 14.4 | 8 | 2% | 1 | 12 | 8 | 2 | 100% |
| Ingleton sewage works overflow Ingleton WwTW · UUP01022 | United Utilities | 26.3 | 15 | 2% | 201 | 174 | 144 | 2,446 | 100% |
| Sedbergh sewage works overflow Sedbergh WwTW · UUP01733 | United Utilities | 41.3 | 23 | 2% | 64 | 66 | 51 | 432 | 100% |
| Artle Beck storm overflow Artle Beck CSO · UUP00137 | United Utilities | 2.4 | 1 | 2% | 6 | 16 | 11 | 21 | 99% |
| Artle Beck Road storm overflow Artle Beck Road CSO · UUP00138 | United Utilities | 2.6 | 2 | 2% | 9 | 10 | 9 | 2 | 97% |
| Mortar Pits storm overflow Mortar Pits CSO · UUP01345 | United Utilities | 43.4 | 24 | 2% | 26 | 24 | 24 | 18 | 100% |
| Settlebeck (Sedbergh) storm overflow Settlebeck (Sedbergh) Combined Sewer Overflow · UUP01738 | United Utilities | 43.6 | 24 | 2% | 0 | 4 | 1 | 0 | 100% |
| Bull Beck Brookhouse storm overflow Bull Beck Brookhouse Combined Sewer Overflow (Site ID 251HH) (LAN0089) · UUP00362 | United Utilities | 4.7 | 3 | 1% | 5 | 7 | 9 | 25 | 97% |
| Tebay sewage works overflow Tebay WwTW · UUP01905 | United Utilities | 53.8 | 30 | 1% | 146 | 155 | 95 | 640 | 95% |
| Galloper Pool pumping station overflow Galloper Pool PS · UUP00769 | United Utilities | 55.6 | 31 | 0% | 166 | 107 | 18 | 53 | 99% |
| Adjacent Cross Keys Inn UUP01809 | United Utilities | 55.4 | 31 | 0% | 155 | 1 | 4 | 4 | 72% |
| Austwick pumping station overflow Austwick SPS · UUP00160 | United Utilities | 33.0 | 18 | <1% | 103 | 117 | 97 | 1,842 | 99% |
| Clapham sewage works overflow Clapham WwTW · UUP00492 | United Utilities | 32.7 | 18 | <1% | 61 | 3 | 3 | 15 | 100% |
| Tebay pumping station overflow Tebay Sewage PS · UUP01904 | United Utilities | 56.7 | 32 | <1% | 124 | 84 | 61 | 593 | 96% |
| Dent sewage works overflow Dent WwTW · UUP00630 | United Utilities | 49.2 | 27 | <1% | 78 | 87 | 126 | 319 | 99% |
A dash: no annual return for that overflow in that year.
Sources and credits
Storm overflow annual returns: © Environment Agency copyright and/or database right 2025, Open Government Licence v3.0. Overflow positions: the water companies via the National Storm Overflow Hub, CC BY 4.0. River network: contains OS data © Crown copyright and database right 2026 (OS Open Rivers). Traced and weighted by SwimSignal (swimsignal.co.uk), whose method is at swimsignal.co.uk/methods.html. All credits and licences.