Calne Quemerford Bridge
Storm overflow operated by Wessex Water. The source names River Marden as the receiving water.
- 12
- Spills in 2025
- 45.1
- Recorded hours
- 96.7%
- Monitor operation
- 4
- Years listed
Checking the latest monitor report…
How it compares in 2025
Calne Quemerford Bridge recorded 12 spills in 2025. That is more than 51% of the 14,239 overflows in England with a reported figure, and ranks 6,643rd nationally. Among Wessex Water overflows it ranks 625th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Marden - source to conf Cowage Bk waterbody it ranks 6th of 12.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 12 | 45.1 |
| England | 6,643rd of 14,239 | 11 | 22.3 |
| Wessex Water | 625th of 1,332 | 11 | 18.9 |
| Marden - source to conf Cowage Bk | 6th of 12 | 11 | 38.8 |
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 | 12 | 45.1 hours | 96.7% | Official data |
| 2024 | 49 | 390.3 hours | 84.9%Low coverage | Official data |
| 2023 | 46 | 262.6 hours | 99.6% | Official data |
| 2022 | 24 | 71.6 hours | 100% | 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
- Wessex Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- 102552
- Activity reference
- 1-STORM OVERFLOW
- Grid reference
- SU0065569807
- Waterbody ID
- GB109053022050Official 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 1 km south of the Calne reference point in the ONS built-up areas data.
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
- Calne Rough LeazeCurrent status unknown
Wessex Water · River Marden
- Compton Bassett Storm TankCurrent status unknown
Wessex Water · Rivers Brook(S)
- Compton Bassett The PondCurrent status unknown
Wessex Water · Tributary of Abberd Brook
- Lyneham B Site (Main STW) Raf Lyneham Storm TankCurrent status unknown
Wessex Water · Springs Watercourse
Questions about Calne Quemerford Bridge
- Who operates Calne Quemerford Bridge?
- Wessex Water is the operator named in the annual record. The permit reference is 102552.
- Where does Calne Quemerford Bridge discharge?
- The source names River Marden as the receiving water. This does not show how far a discharge travelled.
- How many times did Calne Quemerford Bridge spill in 2025?
- The 2025 return records 12 counted spill events and 45.1 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 96.7% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Calne Quemerford Bridge discharging right now?
- This record is linked to a company live feed. The panel above shows the latest report we hold, with its date. That report can be old, and the monitor can be offline, so check the date before relying on it. A report that no discharge is taking place is not a water-quality result.
- 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 Calne Quemerford 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 Calne Quemerford Bridge compare with other overflows?
- Calne Quemerford Bridge recorded 12 spills in 2025. That is more than 51% of the 14,239 overflows in England with a reported figure, and ranks 6,643rd nationally. Among Wessex Water overflows it ranks 625th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Marden - source to conf Cowage Bk waterbody it ranks 6th of 12. 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.