Chester Grosvenor Bridge
Storm overflow operated by Dŵr Cymru Welsh Water. The source names River Dee as the receiving water.
- 13
- Spills in 2025
- 38.5
- Recorded hours
- 99.8%
- Monitor operation
- 2
- Years listed
The reported spill count was 12 lower than in 2024. This compares event counts, not discharge volume.
We do not have a live report for this outlet. Its annual spill records are shown below.
How it compares in 2025
Chester Grosvenor Bridge recorded 13 spills in 2025. That is more than 53% of the 14,239 overflows in England with a reported figure, and ranks 6,413th nationally. Among Dŵr Cymru Welsh Water overflows it ranks 66th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills. On the Dee (N. Wales) waterbody it ranks 11th of 24.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 13 | 38.5 |
| England | 6,413th of 14,239 | 11 | 22.3 |
| Dŵr Cymru Welsh Water | 66th of 122 | 14.5 | 29.3 |
| Dee (N. Wales) | 11th of 24 | 9 | 14.1 |
Rank 1 has the most spills. Equal counts share a rank. Only overflows with a reported count are ranked. Counts do not measure volume, so a higher rank does not mean more sewage.
Annual spill history
| Year | Spills | Duration | Monitor operation | Source |
|---|---|---|---|---|
| 2025 | 13 | 38.5 hours | 99.8% | Official data |
| 2024 | 25 | 55.5 hours | 99.4% | Official data |
A missing figure means the source did not provide a usable value. A zero is shown as zero. Monitor operation below 90% can make comparison less reliable.
Outlet details
- Water company
- Dŵr Cymru Welsh Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- CG0355401
- Activity reference
- 1
- Grid reference
- SJ4001065463
- Waterbody ID
- GB531106708200Official waterbody record ↗
- Location source
- Official annual grid reference
- Location precision
- About 1 metres
- Location note
- Unknown
About the name and type
The annual return lists this asset as “SO on sewer network”: storm overflow on the sewer network. The return places this overflow on the sewer network.
The waterbody link opens the Environment Agency record for the exact ID in the return. It is a source lookup; we do not import its classification.
Where it is
The recorded position is about 4.3 km west of the Littleton (Cheshire West and Chester) reference point in the ONS built-up areas data.
Designated bathing waters within 3 km in a straight line:
Distance does not show that water from this outlet reaches a bathing water. Check the official bathing-water profile for its classification and advice.
Area and water pages
Check the official record
Public access to this outlet is unknown. Do not enter restricted land or use this page as a route guide.
Open official source ↗Other outlet records nearby
- Chester The Dingle Manhole 1405Current status unknown
Dŵr Cymru Welsh Water · Tributary of the River Dee
- Chester Curzon Park North No 22Current status unknown
Dŵr Cymru Welsh Water · Tributary of the River Dee
- Chester The Dingle Manhole 1202Current status unknown
Dŵr Cymru Welsh Water · River Dee
- Chester Little RoodeeCurrent status unknown
Dŵr Cymru Welsh Water · River Dee
Questions about Chester Grosvenor Bridge
- Who operates Chester Grosvenor Bridge?
- Dŵr Cymru Welsh Water is the operator named in the annual record. The permit reference is CG0355401.
- Where does Chester Grosvenor Bridge discharge?
- The source names River Dee as the receiving water. This does not show how far a discharge travelled.
- How many times did Chester Grosvenor Bridge spill in 2025?
- The 2025 return records 13 counted spill events and 38.5 hours of recorded discharge. Spills are counted with the 12/24-hour method, so this is not a count of every start signal.
- Can I trust the 2025 figures for this outlet?
- The monitor worked for 99.8% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Chester Grosvenor Bridge discharging right now?
- This record is not matched to a company live feed, so we cannot show a current report. Only the annual figures are available for this outlet.
- How accurate is the map marker?
- The marker comes from the grid reference in the official annual return, which is accurate to about 1 metres. It shows the recorded outlet position, not the extent of any discharge.
- What kind of outlet is Chester Grosvenor Bridge?
- The annual return lists the asset type as “SO on sewer network”, which means storm overflow on the sewer network. The return places this overflow on the sewer network.
- How does Chester Grosvenor Bridge compare with other overflows?
- Chester Grosvenor Bridge recorded 13 spills in 2025. That is more than 53% of the 14,239 overflows in England with a reported figure, and ranks 6,413th nationally. Among Dŵr Cymru Welsh Water overflows it ranks 66th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills. On the Dee (N. Wales) waterbody it ranks 11th of 24. Ranks compare counted spill events only. They do not compare volume or harm.
- Does zero spills mean the water was safe?
- No. A zero means the annual return recorded zero counted spill events for this outlet and year. It is not a water-quality test, and pollution can come from other sources.