Sywell Brook A4500 Road Bridge
EA name: SYWELL BK.A4500 RD.BR.
Environment Agency sampling point AN-SYWB040E · 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
- 5 Aug 2026, 12:3757 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 21 since 10 Jun 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 483940, 264319As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- Barton BrookPlaced by position alone, on a line whose map name differs from its own, 2 m from the line.
- Next gauge downstream
- Islip Sluice On the River Nene · 35 km along the river (the path rests on a repair to the map)
- Why it was sampled
- Environmental monitoring statutory (EU directives) (21 samples)
1 visit found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93%
Sampled 17 Jul 2026, 2 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | 93 | 93% |
| 1 Jun 2026, 11:06 | 95 | 95% |
| 20 May 2026, 12:23 | 91.5 | 91.5% |
| 21 Apr 2026, 09:39 | 96 | 96% |
| 18 Mar 2026, 12:55 | 100.9 | 100.9% |
| 20 Feb 2026, 10:38 | 99.5 | 99.5% |
| 8 Dec 2025, 15:56 | 95.4 | 95.4% |
| 21 Nov 2025, 12:07 | 87.7 | 87.7% |
| 14 Oct 2025, 12:30 | 88.3 | 88.3% |
| 4 Apr 2025, 12:06 | 112.2 | 112.2% |
| 11 Mar 2025, 09:50 | 99 | 99% |
| 3 Feb 2025, 10:41 | 97.7 | 97.7% |
| 16 Jan 2025, 12:33 | 96.3 | 96.3% |
| 2 Dec 2024, 14:06 | 93.4 | 93.4% |
| 4 Nov 2024, 12:49 | 93.4 | 93.4% |
| 11 Oct 2024, 12:29 | 98.3 | 98.3% |
| 9 Sep 2024, 15:05 | 66.7 | 66.7% |
| 1 Aug 2024, 14:16 | 98 | 98% |
| 2 Jul 2024, 12:42 | 14 | 14% |
| 10 Jun 2024, 13:20 | 95.2 | 95.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.06 mg/l
Sampled 17 Jul 2026, 2 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | 9.06 | 9.06 mg/l |
| 1 Jun 2026, 11:06 | 9.39 | 9.39 mg/l |
| 20 May 2026, 12:23 | 9.71 | 9.71 mg/l |
| 21 Apr 2026, 09:39 | 10.6 | 10.6 mg/l |
| 18 Mar 2026, 12:55 | 11.2 | 11.2 mg/l |
| 20 Feb 2026, 10:38 | 12.6 | 12.6 mg/l |
| 8 Dec 2025, 15:56 | 11.1 | 11.1 mg/l |
| 21 Nov 2025, 12:07 | 11.5 | 11.5 mg/l |
| 14 Oct 2025, 12:30 | 9.58 | 9.58 mg/l |
| 4 Apr 2025, 12:06 | 12.1 | 12.1 mg/l |
| 11 Mar 2025, 09:50 | 12.1 | 12.1 mg/l |
| 3 Feb 2025, 10:41 | 12.5 | 12.5 mg/l |
| 16 Jan 2025, 12:33 | 12.3 | 12.3 mg/l |
| 2 Dec 2024, 14:06 | 10.7 | 10.7 mg/l |
| 4 Nov 2024, 12:49 | 10.1 | 10.1 mg/l |
| 11 Oct 2024, 12:29 | 10.8 | 10.8 mg/l |
| 9 Sep 2024, 15:05 | 6.65 | 6.65 mg/l |
| 1 Aug 2024, 14:16 | 9 | 9 mg/l |
| 2 Jul 2024, 12:42 | 1.44 | 1.44 mg/l |
| 10 Jun 2024, 13:20 | 9.62 | 9.62 mg/l |
Water temperature
code 0076 · °C
16.5 °C
Sampled 17 Jul 2026, 2 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | 16.5 | 16.5 °C |
| 1 Jun 2026, 11:06 | 15.8 | 15.8 °C |
| 20 May 2026, 12:23 | 12.6 | 12.6 °C |
| 21 Apr 2026, 09:39 | 11 | 11 °C |
| 18 Mar 2026, 12:55 | 10.5 | 10.5 °C |
| 20 Feb 2026, 10:38 | 5.3 | 5.3 °C |
| 8 Dec 2025, 15:56 | 8.5 | 8.5 °C |
| 21 Nov 2025, 12:07 | 4.1 | 4.1 °C |
| 14 Oct 2025, 12:30 | 11.6 | 11.6 °C |
| 4 Apr 2025, 12:06 | 11.9 | 11.9 °C |
| 11 Mar 2025, 09:50 | 6.7 | 6.7 °C |
| 3 Feb 2025, 10:41 | 4.9 | 4.9 °C |
| 16 Jan 2025, 12:33 | 5 | 5 °C |
| 2 Dec 2024, 14:06 | 9.3 | 9.3 °C |
| 4 Nov 2024, 12:49 | 11.7 | 11.7 °C |
| 11 Oct 2024, 12:29 | 11 | 11 °C |
| 9 Sep 2024, 15:05 | 15.4 | 15.4 °C |
| 1 Aug 2024, 14:16 | 19.4 | 19.4 °C |
| 2 Jul 2024, 12:42 | 13.9 | 13.9 °C |
| 10 Jun 2024, 13:20 | 14.8 | 14.8 °C |
pH
code 0061
7.97
Sampled 17 Jul 2026, 2 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | 7.97 | 7.97 |
| 1 Jun 2026, 11:06 | 8.06 | 8.06 |
| 20 May 2026, 12:23 | 8.02 | 8.02 |
| 21 Apr 2026, 09:39 | 8.13 | 8.13 |
| 18 Mar 2026, 12:55 | 8.08 | 8.08 |
| 20 Feb 2026, 10:38 | 8.05 | 8.05 |
| 8 Dec 2025, 15:56 | 8.21 | 8.21 |
| 21 Nov 2025, 12:07 | 7.86 | 7.86 |
| 14 Oct 2025, 12:30 | 7.98 | 7.98 |
| 4 Apr 2025, 12:06 | 8.47 | 8.47 |
| 11 Mar 2025, 09:50 | 8.2 | 8.2 |
| 3 Feb 2025, 10:41 | 8.19 | 8.19 |
| 16 Jan 2025, 12:33 | 8.13 | 8.13 |
| 2 Dec 2024, 14:06 | 7.83 | 7.83 |
| 4 Nov 2024, 12:49 | 8.01 | 8.01 |
| 11 Oct 2024, 12:29 | 7.89 | 7.89 |
| 9 Sep 2024, 15:05 | 7.74 | 7.74 |
| 1 Aug 2024, 14:16 | 8.13 | 8.13 |
| 2 Jul 2024, 12:42 | 8.11 | 8.11 |
| 10 Jun 2024, 13:20 | 8.14 | 8.14 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 17 Jul 2026, 2 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jun 2026, 11:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 May 2026, 12:23 | 0.055 | 0.055 mg/l |
| 21 Apr 2026, 09:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2026, 12:55 | 0.033 | 0.033 mg/l |
| 20 Feb 2026, 10:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Dec 2025, 15:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Nov 2025, 12:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2025, 12:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Apr 2025, 12:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Mar 2025, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2025, 10:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2025, 12:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Dec 2024, 14:06 | 0.034 | 0.034 mg/l |
| 4 Nov 2024, 12:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Oct 2024, 12:29 | 0.049 | 0.049 mg/l |
| 9 Sep 2024, 15:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2024, 14:16 | 0.036 | 0.036 mg/l |
| 2 Jul 2024, 12:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jun 2024, 13:20 | 0.033 | 0.033 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.22 mg/l
Sampled 17 Jul 2026, 2 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | 6.22 | 6.22 mg/l |
| 1 Jun 2026, 11:06 | 4.88 | 4.88 mg/l |
| 20 May 2026, 12:23 | 1.28 | 1.28 mg/l |
| 21 Apr 2026, 09:39 | 6.67 | 6.67 mg/l |
| 18 Mar 2026, 12:55 | 8.08 | 8.08 mg/l |
| 20 Feb 2026, 10:38 | 7.28 | 7.28 mg/l |
| 8 Dec 2025, 15:56 | 3.69 | 3.69 mg/l |
| 21 Nov 2025, 12:07 | 8.49 | 8.49 mg/l |
| 14 Oct 2025, 12:30 | 6.48 | 6.48 mg/l |
| 4 Apr 2025, 12:06 | 6.97 | 6.97 mg/l |
| 11 Mar 2025, 09:50 | 9.58 | 9.58 mg/l |
| 3 Feb 2025, 10:41 | 9.08 | 9.08 mg/l |
| 16 Jan 2025, 12:33 | 9.18 | 9.18 mg/l |
| 2 Dec 2024, 14:06 | 7.07 | 7.07 mg/l |
| 4 Nov 2024, 12:49 | 7.38 | 7.38 mg/l |
| 11 Oct 2024, 12:29 | 6.35 | 6.35 mg/l |
| 9 Sep 2024, 15:05 | 7.67 | 7.67 mg/l |
| 1 Aug 2024, 14:16 | 6.37 | 6.37 mg/l |
| 2 Jul 2024, 12:42 | 9.86 | 9.86 mg/l |
| 10 Jun 2024, 13:20 | 8.36 | 8.36 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.054 mg/l
Sampled 17 Jul 2026, 2 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | 0.054 | 0.054 mg/l |
| 1 Jun 2026, 11:06 | 0.01 | 0.01 mg/l |
| 20 May 2026, 12:23 | 0.024 | 0.024 mg/l |
| 21 Apr 2026, 09:39 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Mar 2026, 12:55 | 0.014 | 0.014 mg/l |
| 20 Feb 2026, 10:38 | 0.014 | 0.014 mg/l |
| 8 Dec 2025, 15:56 | 0.027 | 0.027 mg/l |
| 21 Nov 2025, 12:07 | 0.022 | 0.022 mg/l |
| 14 Oct 2025, 12:30 | 0.062 | 0.062 mg/l |
| 4 Apr 2025, 12:06 | 0.034 | 0.034 mg/l |
| 11 Mar 2025, 09:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Feb 2025, 10:41 | 0.011 | 0.011 mg/l |
| 16 Jan 2025, 12:33 | 0.014 | 0.014 mg/l |
| 4 Nov 2024, 12:49 | <0.01 | below 0.01 mg/l (not detected above this) |
| 11 Oct 2024, 12:29 | 0.098 | 0.098 mg/l |
| 9 Sep 2024, 15:05 | 0.077 | 0.077 mg/l |
| 1 Aug 2024, 14:16 | 0.04 | 0.04 mg/l |
| 2 Jul 2024, 12:42 | 0.035 | 0.035 mg/l |
| 10 Jun 2024, 13:20 | 0.016 | 0.016 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
508 µS/cm
Sampled 17 Jul 2026, 2 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Jul 2026, 10:05 | 508 | 508 µS/cm |
| 1 Jun 2026, 11:06 | 486 | 486 µS/cm |
| 20 May 2026, 12:23 | 668 | 668 µS/cm |
| 21 Apr 2026, 09:39 | 543 | 543 µS/cm |
| 18 Mar 2026, 12:55 | 522 | 522 µS/cm |
| 20 Feb 2026, 10:38 | 506 | 506 µS/cm |
| 8 Dec 2025, 15:56 | 470 | 470 µS/cm |
| 21 Nov 2025, 12:07 | 620 | 620 µS/cm |
| 14 Oct 2025, 12:30 | 571 | 571 µS/cm |
| 4 Apr 2025, 12:06 | 700 | 700 µS/cm |
| 11 Mar 2025, 09:50 | 571 | 571 µS/cm |
| 3 Feb 2025, 10:41 | 550 | 550 µS/cm |
| 16 Jan 2025, 12:33 | 562 | 562 µS/cm |
| 2 Dec 2024, 14:06 | 766 | 766 µS/cm |
| 4 Nov 2024, 12:49 | 501 | 501 µS/cm |
| 11 Oct 2024, 12:29 | 602 | 602 µS/cm |
| 9 Sep 2024, 15:05 | 799 | 799 µS/cm |
| 1 Aug 2024, 14:16 | 514 | 514 µS/cm |
| 2 Jul 2024, 12:42 | 595 | 595 µS/cm |
| 10 Jun 2024, 13:20 | 496 | 496 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 20 | Jun 2024 – Jul 2026 | 93% 17 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Jun 2024 – Jul 2026 | 9.06 mg/l 17 Jul 2026 |
| Temperature of Water 0076 | River water | 20 | Jun 2024 – Jul 2026 | 16.5 °C 17 Jul 2026 |
| pH 0061 | River water | 20 | Jun 2024 – Jul 2026 | 7.97 17 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Jun 2024 – Jul 2026 | below 0.03 mg/l 17 Jul 2026 |
| Nitrate as N 0117 | River water | 20 | Jun 2024 – Jul 2026 | 6.22 mg/l 17 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 19 | Jun 2024 – Jul 2026 | 0.054 mg/l 17 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Jun 2024 – Jul 2026 | 508 µS/cm 17 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Jun 2024 – Jul 2026 | 120 mg/l 17 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Jun 2024 – Jul 2026 | below 0.00082 mg/l 17 Jul 2026 |
| Nitrite as N 0118 | River water | 20 | Jun 2024 – Jul 2026 | 0.081 mg/l 17 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Jun 2024 – Jul 2026 | 6.3 mg/l 17 Jul 2026 |
| No flow /No sample 7668 | River water | 1 | Aug 2026 – Aug 2026 | No flow/discharge at sampling point 5 Aug 2026 |
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.