Blackwater River
Joins the Yare above COLNEY FGS, no more than 28.4 km by river above COLNEY FGS.
| Southburgh | 0.53 mASD 42m ago | Low |
Its water passes COLNEY FGS.
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Live levels from 6 monitoring stations across Norfolk, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Colney | 0.11 m 5h ago | Low | ||
| 25.6 km by river | ||||
| Brundall | 0.81 mAOD 42m ago | Normal | ||
| downstream, distance by river not measured | ||||
| Rockland St Mary | 0.31 mAOD 5h ago | Normal | ||
| 7.6 km by river | ||||
| Cantley | 0.32 mAOD 5h ago | Normal | ||
| 6.2 km by river | ||||
| Reedham | 1.37 mASD 42m ago | Normal | ||
These gauges are filed under the Yare, but the river map places them on another watercourse, so they are not in the Yare’s order above.
| Burgh Castleon River Waveney | 0.87 mAOD 42m ago | Normal | ||
| Downstream of Reedham, 12.6 km by river. | ||||
Also on the Yare by the river map, but filed under another river name: COLNEY FGS.
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 Yare 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 Yare above COLNEY FGS, no more than 28.4 km by river above COLNEY FGS.
| Southburgh | 0.53 mASD 42m ago | Low |
Its water passes COLNEY FGS.
Joins the Yare above COLNEY FGS, no more than 21.2 km by river above COLNEY FGS.
| Wymondham | 1.12 mASD 42m ago | Low |
Its water passes COLNEY FGS.
Joins the Yare between Colney and Brundall, no more than 23.5 km by river above Brundall.
| Shotesham | 0.16 mASD 42m ago | Low |
Its water passes Brundall and every gauge below it on the Yare. It does not pass Colney or the gauges above it.
Joins the Yare between Colney and Brundall, no more than 41.6 km by river above Brundall.
| Stone Road Farm | 0.20 mASD 42m ago | Normal |
Its water passes Brundall and every gauge below it on the Yare. It does not pass Colney or the gauges above it.
Joins the Yare between Colney and Brundall, no more than 26.0 km by river above Brundall.
| Fakenham | 0.39 mASD 42m ago | Normal |
| 21.5 km by river | ||
| Swanton Morley | 0.10 m 5h ago | Normal |
| 30.0 km by river | ||
| COSTESSEY MILL SLUICEstructure | 1.30 m3/s 47m ago | — |
| same site | ||
| Costessey Mill | 0.25 mASD 47m ago | Normal |
| same site | ||
| COSTESSEY MILL SLUICEstructure | 1.30 m3/s 47m ago | — |
Its water passes Brundall and every gauge below it on the Yare. It does not pass Colney or the gauges above it.
Below Reedham, its water next reaches Burgh Castle, a gauge on River Waveney, 12.6 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.
22 storm overflows are traced upstream of Reedham, the Yare’s lowest gauge on the river map: on the Yare itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Reedham: 110 spills over 434 hours in total, across the 21 that have a figure. 1 had no usable monitor data that year.
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 Yare includes the smaller streams that join it there.
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. 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.
78 sampling points on the River Yare and the streams that join it above Reedham. 39 have a sample from the last 12 months; 44 have any sample banked.
Sampled most recently, anywhere on the Yare and its streams:
| Where, from the source down | Sampling points | Newest sample |
|---|---|---|
| River Wensum and its streamsjoins the Yare above Brundall | 31 points19 sampled | 1 Oct 2026 |
| Above SouthburghBlackwater River · joins the Yare above COLNEY FGS | 1 point | 14 Apr 2026 |
| Above WymondhamRiver Tiffey · joins the Yare above COLNEY FGS | 2 points0 sampled | none banked |
| Above Stone Road FarmRiver Tud · joins the Yare above Brundall | 2 points1 sampled | 11 Dec 2025 |
| Above COLNEY FGS | 12 points4 sampled | 28 Sep 2026 |
| Above ShoteshamRiver Tas · joins the Yare above Brundall | 7 points5 sampled | 28 Aug 2026 |
| Above Brundall | 17 points10 sampled | 28 Sep 2026 |
| Above Cantley | 4 points2 sampled | 28 Sep 2026 |
| Above Reedham | 2 points | 6 Mar 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.
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