River Stour Dedham Bridge
EA name: R.STOUR DEDHAM BRIDGE
Environment Agency sampling point AN-ST0183 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)
These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.
Where and when
- Last sampled
- 3 Mar 2025, 13:2520 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 26 Oct 2026 and had nothing newer.
- Samples banked
- 12 since 25 Apr 2024 Imported periods: 1 Oct 2023 – 26 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 605801, 233604As published, to the nearest 1 m. Open in a map
- River, by its own name
- Stour
- River, by the map
- River StourPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Nearest gauge upstream
- Langham On the River Stour · 6.0 km along the riverPolstead On the River Box · 12 km along the riverPOLSTEAD FGS GSM 12 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (12 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
102.6%
Sampled 3 Mar 2025, 20 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 102.6 | 102.6% |
| 10 Feb 2025, 11:43 | 101 | 101% |
| 16 Jan 2025, 14:57 | 98.1 | 98.1% |
| 5 Dec 2024, 10:03 | 97.9 | 97.9% |
| 13 Nov 2024, 14:18 | 85.9 | 85.9% |
| 1 Oct 2024, 11:25 | 89.1 | 89.1% |
| 2 Sep 2024, 14:58 | 114.8 | 114.8% |
| 1 Aug 2024, 13:33 | 153.2 | 153.2% |
| 2 Jul 2024, 10:57 | 99.5 | 99.5% |
| 7 Jun 2024, 11:47 | 108.7 | 108.7% |
| 2 May 2024, 13:40 | 100.7 | 100.7% |
| 25 Apr 2024, 14:27 | 123.4 | 123.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
12.5 mg/l
Sampled 3 Mar 2025, 20 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 12.5 | 12.5 mg/l |
| 10 Feb 2025, 11:43 | 12.8 | 12.8 mg/l |
| 16 Jan 2025, 14:57 | 12.2 | 12.2 mg/l |
| 5 Dec 2024, 10:03 | 11.5 | 11.5 mg/l |
| 13 Nov 2024, 14:18 | 9.56 | 9.56 mg/l |
| 1 Oct 2024, 11:25 | 9.37 | 9.37 mg/l |
| 2 Sep 2024, 14:58 | 10.5 | 10.5 mg/l |
| 1 Aug 2024, 13:33 | 13.1 | 13.1 mg/l |
| 2 Jul 2024, 10:57 | 9.34 | 9.34 mg/l |
| 7 Jun 2024, 11:47 | 10.4 | 10.4 mg/l |
| 2 May 2024, 13:40 | 10.1 | 10.1 mg/l |
| 25 Apr 2024, 14:27 | 13.7 | 13.7 mg/l |
Water temperature
code 0076 · °C
6.7 °C
Sampled 3 Mar 2025, 20 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 6.7 | 6.7 °C |
| 10 Feb 2025, 11:43 | 5.1 | 5.1 °C |
| 16 Jan 2025, 14:57 | 6.1 | 6.1 °C |
| 5 Dec 2024, 10:03 | 8.1 | 8.1 °C |
| 13 Nov 2024, 14:18 | 10.5 | 10.5 °C |
| 1 Oct 2024, 11:25 | 13 | 13 °C |
| 2 Sep 2024, 14:58 | 19.8 | 19.8 °C |
| 1 Aug 2024, 13:33 | 22.9 | 22.9 °C |
| 2 Jul 2024, 10:57 | 18.3 | 18.3 °C |
| 7 Jun 2024, 11:47 | 17.4 | 17.4 °C |
| 2 May 2024, 13:40 | 15 | 15 °C |
| 25 Apr 2024, 14:27 | 10.7 | 10.7 °C |
pH
code 0061
8.34
Sampled 3 Mar 2025, 20 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 8.34 | 8.34 |
| 10 Feb 2025, 11:43 | 8.26 | 8.26 |
| 16 Jan 2025, 14:57 | 8.12 | 8.12 |
| 5 Dec 2024, 10:03 | 8.06 | 8.06 |
| 13 Nov 2024, 14:18 | 7.91 | 7.91 |
| 1 Oct 2024, 11:25 | 7.92 | 7.92 |
| 2 Sep 2024, 14:58 | 8.24 | 8.24 |
| 1 Aug 2024, 13:33 | 8.59 | 8.59 |
| 2 Jul 2024, 10:57 | 8.11 | 8.11 |
| 7 Jun 2024, 11:47 | 8.14 | 8.14 |
| 2 May 2024, 13:40 | 8.18 | 8.18 |
| 25 Apr 2024, 14:27 | 8.58 | 8.58 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 3 Mar 2025, 20 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Feb 2025, 11:43 | 0.045 | 0.045 mg/l |
| 16 Jan 2025, 14:57 | 0.076 | 0.076 mg/l |
| 13 Nov 2024, 14:18 | 0.032 | 0.032 mg/l |
| 1 Oct 2024, 11:25 | 0.038 | 0.038 mg/l |
| 2 Sep 2024, 14:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2024, 13:33 | 0.046 | 0.046 mg/l |
| 2 Jul 2024, 10:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jun 2024, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 May 2024, 13:40 | 0.045 | 0.045 mg/l |
| 25 Apr 2024, 14:27 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
9.98 mg/l
Sampled 3 Mar 2025, 20 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 9.98 | 9.98 mg/l |
| 10 Feb 2025, 11:43 | 8.66 | 8.66 mg/l |
| 16 Jan 2025, 14:57 | 8.06 | 8.06 mg/l |
| 13 Nov 2024, 14:18 | 5.48 | 5.48 mg/l |
| 1 Oct 2024, 11:25 | 4.68 | 4.68 mg/l |
| 2 Sep 2024, 14:58 | 2.77 | 2.77 mg/l |
| 1 Aug 2024, 13:33 | 2.86 | 2.86 mg/l |
| 2 Jul 2024, 10:57 | 4.17 | 4.17 mg/l |
| 7 Jun 2024, 11:47 | 5.27 | 5.27 mg/l |
| 2 May 2024, 13:40 | 13.9 | 13.9 mg/l |
| 25 Apr 2024, 14:27 | 5.28 | 5.28 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.042 mg/l
Sampled 3 Mar 2025, 20 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 0.042 | 0.042 mg/l |
| 10 Feb 2025, 11:43 | 0.069 | 0.069 mg/l |
| 16 Jan 2025, 14:57 | 0.079 | 0.079 mg/l |
| 13 Nov 2024, 14:18 | 0.13 | 0.13 mg/l |
| 1 Oct 2024, 11:25 | 0.15 | 0.15 mg/l |
| 2 Sep 2024, 14:58 | 0.037 | 0.037 mg/l |
| 1 Aug 2024, 13:33 | 0.056 | 0.056 mg/l |
| 2 Jul 2024, 10:57 | 0.086 | 0.086 mg/l |
| 7 Jun 2024, 11:47 | 0.11 | 0.11 mg/l |
| 2 May 2024, 13:40 | 0.069 | 0.069 mg/l |
| 25 Apr 2024, 14:27 | 0.013 | 0.013 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
768 µS/cm
Sampled 3 Mar 2025, 20 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 768 | 768 µS/cm |
| 10 Feb 2025, 11:43 | 845 | 845 µS/cm |
| 16 Jan 2025, 14:57 | 835 | 835 µS/cm |
| 5 Dec 2024, 10:03 | 807 | 807 µS/cm |
| 13 Nov 2024, 14:18 | 884 | 884 µS/cm |
| 1 Oct 2024, 11:25 | 832 | 832 µS/cm |
| 2 Sep 2024, 14:58 | 860 | 860 µS/cm |
| 1 Aug 2024, 13:33 | 774 | 774 µS/cm |
| 2 Jul 2024, 10:57 | 837 | 837 µS/cm |
| 7 Jun 2024, 11:47 | 827 | 827 µS/cm |
| 2 May 2024, 13:40 | 752 | 752 µS/cm |
| 25 Apr 2024, 14:27 | 797 | 797 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
110 per 100 ml
Sampled 3 Mar 2025, 20 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Mar 2025, 13:25 | 110 | 110 per 100 ml |
| 10 Feb 2025, 11:43 | 270 | 270 per 100 ml |
| 16 Jan 2025, 14:57 | 460 | 460 per 100 ml |
| 5 Dec 2024, 10:03 | 260 | 260 per 100 ml |
| 13 Nov 2024, 14:18 | 72 | 72 per 100 ml |
| 1 Oct 2024, 11:25 | 2000 | 2000 per 100 ml |
| 2 Sep 2024, 14:58 | 2300 | 2300 per 100 ml |
| 1 Aug 2024, 13:33 | <10 | below 10 per 100 ml (not detected above this) |
| 2 Jul 2024, 10:57 | 270 | 270 per 100 ml |
| 7 Jun 2024, 11:47 | 63 | 63 per 100 ml |
| 2 May 2024, 13:40 | 72 | 72 per 100 ml |
| 25 Apr 2024, 14:27 | 99 | 99 per 100 ml |
Everything measured here
17 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.
Show all 17 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 12 | Apr 2024 – Mar 2025 | 102.6% 3 Mar 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 12 | Apr 2024 – Mar 2025 | 12.5 mg/l 3 Mar 2025 |
| Temperature of Water 0076 | River water | 12 | Apr 2024 – Mar 2025 | 6.7 °C 3 Mar 2025 |
| pH 0061 | River water | 12 | Apr 2024 – Mar 2025 | 8.34 3 Mar 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 11 | Apr 2024 – Mar 2025 | below 0.03 mg/l 3 Mar 2025 |
| Nitrate as N 0117 | River water | 11 | Apr 2024 – Mar 2025 | 9.98 mg/l 3 Mar 2025 |
| Orthophosphate, reactive as P 0180 | River water | 11 | Apr 2024 – Mar 2025 | 0.042 mg/l 3 Mar 2025 |
| Conductivity at 25 C 0077 | River water | 12 | Apr 2024 – Mar 2025 | 768 µS/cm 3 Mar 2025 |
| Escherichia coli : Confirmed : MF 2348 | River water | 12 | Apr 2024 – Mar 2025 | 110 per 100 ml 3 Mar 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 11 | Apr 2024 – Mar 2025 | 270 mg/l 3 Mar 2025 |
| Ammonia un-ionised as N 0119 | River water | 11 | Apr 2024 – Mar 2025 | below 0.00043 mg/l 3 Mar 2025 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 11 | Apr 2024 – Mar 2025 | 200 colony forming units / 100ml 3 Mar 2025 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 11 | Apr 2024 – Mar 2025 | 250 colony forming units / 100ml 3 Mar 2025 |
| MST Filtration 4926 | River water | 12 | Apr 2024 – Mar 2025 | DNA Stored 3 Mar 2025 |
| Nitrite as N 0118 | River water | 11 | Apr 2024 – Mar 2025 | 0.02 mg/l 3 Mar 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 11 | Apr 2024 – Mar 2025 | 10 mg/l 3 Mar 2025 |
| Volume of Sample Filtered 4865 | River water | 12 | Apr 2024 – Mar 2025 | 950 millilitre 3 Mar 2025 |
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.