FloodRadar
Log inCreate free account
Live levels from 7 monitoring stations across Cambridgeshire, Essex, Gloucestershire, Somerset, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Great Chesterford | 0.13 mASD 28m ago | Normal | ||
| 12.9 km by river | ||||
| Dernford | 0.07 mASD 28m ago | Low | ||
| 15.1 km by river | ||||
| Cambridge Jesus Lockstructure | 0.73 mASD 1h ago | Normal | ||
| 5.8 km by river | ||||
| Cambridge Baits Bite | 0.24 mASD 1h ago | Normal | ||
| Station | Level now | Status | ||
|---|---|---|---|---|
| Cam | 0.89 mASD 43m ago | Normal | ||
| 4.7 km by river | ||||
| Cambridge | 0.10 mASD 43m ago | Low | ||
| Station | Level now | Status |
|---|---|---|
| Weston Bampfyldeplace estimated | 0.01 m 28m ago | Low |
Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.
Contains OS data © Crown copyright and database rights 2026.
Streams and rivers with a gauge whose water joins the Cam above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
Joins the Cam between Dernford and Cambridge Jesus Lock, no more than 3.5 km by river above Cambridge Jesus Lock.
| Bin Brook | 0.17 mASD 28m ago | Normal |
Its water passes Cambridge Jesus Lock and every gauge below it on the Cam. It does not pass Dernford or the gauges above it.
Joins the Cam above Cambridge Jesus Lock, no more than 5.8 km by river above Cambridge Jesus Lock.
| Cambridge Byron's Pool | 0.45 mASD 28m ago | Low |
Its water passes Cambridge Jesus Lock and every gauge below it on the Cam.
Below Cambridge Baits Bite, its water next reaches Soham Lode, a gauge on River Great Ouse, 16.9 km by river downstream.
No gauged tributary joins the Cam above Cambridge on the river map. Streams without a gauge are not counted here.
No gauge below Cambridge is known on the river map.
No gauged tributary joins the Cam above Weston Bampfylde on the river map. Streams without a gauge are not counted here.
Below Weston Bampfylde, its water next reaches Ilchester, a gauge on River Yeo, 12.0 km by river downstream.
Tributaries and where they join are traced on the river map (OS Open Rivers, edition 2026-04) and the Environment Agency’s links between its gauges. The map holds distances between gauges, not the junctions themselves, so a junction is placed between two gauges, and no further up than the tributary’s own lowest gauge. Contains OS data © Crown copyright and database rights 2026.
14 storm overflows are traced upstream of Cambridge Baits Bite, the Cam’s lowest gauge on the river map: on the Cam itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Cambridge Baits Bite: 133 spills over 305 hours in total, across all 14.
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 Cam includes the smaller streams that join it there.
4 storm overflows are traced upstream of Cambridge, the Cam’s lowest gauge on the river map: on the Cam itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Cambridge: 97 spills over 938 hours in total, across all 4.
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 Cam includes the smaller streams that join it there.
2 storm overflows are traced upstream of Weston Bampfylde, the Cam’s lowest gauge on the river map: on the Cam itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Weston Bampfylde: 118 spills over 875 hours in total, across all 2.
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 Cam includes the smaller streams that join it there.
4 other overflows within 3 km of these gauges are placed below the Cam’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: © Anglian Water storm overflow activity data, licensed under CC BY 4.0. Live status: © Severn Trent Water storm overflow activity data, licensed under CC BY 4.0. Live status: © Wessex 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.
Dated samples taken by the Environment Agency, not live readings. Results are published days to months after the sample is taken, and many points are sampled only a few times a year, or have not been sampled for years.
Sampled most recently, anywhere on these rivers and their streams:
53 sampling points on the River Cam and the streams that join it above Cambridge Baits Bite, and below it. 34 have a sample from the last 12 months; 38 have any sample banked.
| Where, from the source down | Sampling points | Newest sample |
|---|---|---|
| River Rhee and its streamsjoins the Cam above Cambridge Jesus Lock | 24 points17 sampled | 1 Oct 2026 |
| Above Great Chesterford | 8 points | 1 Oct 2026 |
| Above Dernford | 8 points5 sampled | 1 Oct 2026 |
| Above Cambridge Jesus Lock | 4 points3 sampled | 7 Sep 2026 |
| Above Cambridge Baits Bite | 6 points3 sampled | 7 Sep 2026 |
| Below the lowest gauge | 3 points2 sampled | 15 May 2026 |
9 sampling points on the River Cam and the streams that join it above Cambridge, and below it. 2 have a sample from the last 12 months; 2 have any sample banked.
| Where, from the source down | Sampling points | Newest sample |
|---|---|---|
| Above Cam | 1 point0 sampled | none banked |
| Above Cambridge | 5 points1 sampled | 27 May 2026 |
| Below the lowest gauge | 3 points1 sampled | 22 May 2026 |
6 sampling points on the River Cam and the streams that join it above Weston Bampfylde, and below it. 3 have a sample from the last 12 months; 3 have any sample banked.
| Where, from the source down | Sampling points | Newest sample |
|---|---|---|
| Above Weston Bampfylde | 4 points1 sampled | 21 May 2026 |
| Below the lowest gauge | 2 points | 11 Sep 2026 |
England's samples only. Each count opens the list of those points, nearest first, with the date of each one’s latest sample (the gauge’s “Upstream of here” list).
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.
FloodRadar helper · beta