Thornborough Grounds
EA name: THORNBOROUGH GROUNDS (also listed as “RSN0050 THORNBOROUGH GROUNDS”)
Environment Agency sampling point AN-RSN0050 · 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
- 10 Aug 2026, 12:4352 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 26 since 21 Jun 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 472876, 234006As 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
- An unnamed streamPlaced by position alone (the only river line close by), 12 m from the line.
- Next gauge downstream
- THORNBOROUGH MILL SLUICE AUTOMATION 1.9 km along the riverThornborough On the River Great Ouse · 1.9 km along the river
- Why it was sampled
- Monitoring (national agency policy) (26 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
60.7%
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | 60.7 | 60.7% |
| 1 Jul 2026, 10:22 | 62.7 | 62.7% |
| 12 Jun 2026, 10:43 | 92.1 | 92.1% |
| 22 May 2026, 12:42 | 85 | 85% |
| 27 Apr 2026, 09:43 | 74.2 | 74.2% |
| 6 Mar 2026, 14:06 | 97.3 | 97.3% |
| 17 Feb 2026, 12:37 | 93.1 | 93.1% |
| 9 Jan 2026, 15:17 | 95.5 | 95.5% |
| 2 Dec 2025, 14:13 | 89 | 89% |
| 4 Nov 2025, 14:12 | 79.3 | 79.3% |
| 8 Oct 2025, 13:06 | 74.2 | 74.2% |
| 3 Sep 2025, 11:34 | 68.5 | 68.5% |
| 20 Aug 2025, 11:07 | 66.5 | 66.5% |
| 4 Jul 2025, 11:42 | 62 | 62% |
| 9 Jun 2025, 10:48 | 90.2 | 90.2% |
| 6 May 2025, 12:26 | 89.4 | 89.4% |
| 4 Apr 2025, 13:47 | 88.2 | 88.2% |
| 14 Mar 2025, 10:38 | 104.7 | 104.7% |
| 10 Feb 2025, 14:23 | 95.4 | 95.4% |
| 27 Jan 2025, 14:26 | 94.4 | 94.4% |
| 16 Dec 2024, 11:28 | 91.8 | 91.8% |
| 21 Oct 2024, 12:54 | 82.4 | 82.4% |
| 25 Sep 2024, 11:32 | 68.7 | 68.7% |
| 22 Aug 2024, 11:51 | 82.9 | 82.9% |
| 15 Jul 2024, 13:55 | 81.6 | 81.6% |
| 21 Jun 2024, 15:25 | 79.5 | 79.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
5.86 mg/l
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | 5.86 | 5.86 mg/l |
| 1 Jul 2026, 10:22 | 5.74 | 5.74 mg/l |
| 12 Jun 2026, 10:43 | 9.34 | 9.34 mg/l |
| 22 May 2026, 12:42 | 8.28 | 8.28 mg/l |
| 27 Apr 2026, 09:43 | 7.74 | 7.74 mg/l |
| 6 Mar 2026, 14:06 | 11.3 | 11.3 mg/l |
| 17 Feb 2026, 12:37 | 11.8 | 11.8 mg/l |
| 9 Jan 2026, 15:17 | 12.6 | 12.6 mg/l |
| 2 Dec 2025, 14:13 | 10.3 | 10.3 mg/l |
| 4 Nov 2025, 14:12 | 8.57 | 8.57 mg/l |
| 8 Oct 2025, 13:06 | 7.76 | 7.76 mg/l |
| 3 Sep 2025, 11:34 | 6.71 | 6.71 mg/l |
| 20 Aug 2025, 11:07 | 6.48 | 6.48 mg/l |
| 4 Jul 2025, 11:42 | 5.9 | 5.9 mg/l |
| 9 Jun 2025, 10:48 | 9.19 | 9.19 mg/l |
| 6 May 2025, 12:26 | 9.57 | 9.57 mg/l |
| 4 Apr 2025, 13:47 | 9.36 | 9.36 mg/l |
| 14 Mar 2025, 10:38 | 13.3 | 13.3 mg/l |
| 10 Feb 2025, 14:23 | 12.2 | 12.2 mg/l |
| 27 Jan 2025, 14:26 | 11.9 | 11.9 mg/l |
| 16 Dec 2024, 11:28 | 10.7 | 10.7 mg/l |
| 21 Oct 2024, 12:54 | 8.84 | 8.84 mg/l |
| 25 Sep 2024, 11:32 | 7.14 | 7.14 mg/l |
| 22 Aug 2024, 11:51 | 8.14 | 8.14 mg/l |
| 15 Jul 2024, 13:55 | 7.9 | 7.9 mg/l |
| 21 Jun 2024, 15:25 | 7.42 | 7.42 mg/l |
Water temperature
code 0076 · °C
16.9 °C
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | 16.9 | 16.9 °C |
| 1 Jul 2026, 10:22 | 19.5 | 19.5 °C |
| 12 Jun 2026, 10:43 | 14.6 | 14.6 °C |
| 22 May 2026, 12:42 | 16.5 | 16.5 °C |
| 27 Apr 2026, 09:43 | 13.3 | 13.3 °C |
| 6 Mar 2026, 14:06 | 8.7 | 8.7 °C |
| 17 Feb 2026, 12:37 | 5.1 | 5.1 °C |
| 9 Jan 2026, 15:17 | 3.6 | 3.6 °C |
| 2 Dec 2025, 14:13 | 8.7 | 8.7 °C |
| 4 Nov 2025, 14:12 | 11.8 | 11.8 °C |
| 8 Oct 2025, 13:06 | 13.2 | 13.2 °C |
| 3 Sep 2025, 11:34 | 16.2 | 16.2 °C |
| 20 Aug 2025, 11:07 | 16.5 | 16.5 °C |
| 4 Jul 2025, 11:42 | 17.6 | 17.6 °C |
| 9 Jun 2025, 10:48 | 14.4 | 14.4 °C |
| 6 May 2025, 12:26 | 12.2 | 12.2 °C |
| 4 Apr 2025, 13:47 | 12.6 | 12.6 °C |
| 14 Mar 2025, 10:38 | 5.1 | 5.1 °C |
| 10 Feb 2025, 14:23 | 4.9 | 4.9 °C |
| 27 Jan 2025, 14:26 | 5.4 | 5.4 °C |
| 16 Dec 2024, 11:28 | 8.7 | 8.7 °C |
| 21 Oct 2024, 12:54 | 12.1 | 12.1 °C |
| 25 Sep 2024, 11:32 | 13.5 | 13.5 °C |
| 22 Aug 2024, 11:51 | 16.1 | 16.1 °C |
| 15 Jul 2024, 13:55 | 16.8 | 16.8 °C |
| 21 Jun 2024, 15:25 | 18.6 | 18.6 °C |
pH
code 0061
7.62
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | 7.62 | 7.62 |
| 1 Jul 2026, 10:22 | 7.53 | 7.53 |
| 12 Jun 2026, 10:43 | 7.93 | 7.93 |
| 22 May 2026, 12:42 | 7.82 | 7.82 |
| 27 Apr 2026, 09:43 | 7.77 | 7.77 |
| 6 Mar 2026, 14:06 | 8.13 | 8.13 |
| 17 Feb 2026, 12:37 | 8 | 8 |
| 9 Jan 2026, 15:17 | 8.23 | 8.23 |
| 2 Dec 2025, 14:13 | 8.15 | 8.15 |
| 4 Nov 2025, 14:12 | 7.92 | 7.92 |
| 8 Oct 2025, 13:06 | 7.83 | 7.83 |
| 3 Sep 2025, 11:34 | 7.56 | 7.56 |
| 20 Aug 2025, 11:07 | 7.55 | 7.55 |
| 4 Jul 2025, 11:42 | 7.62 | 7.62 |
| 9 Jun 2025, 10:48 | 7.81 | 7.81 |
| 6 May 2025, 12:26 | 8.06 | 8.06 |
| 4 Apr 2025, 13:47 | 8.09 | 8.09 |
| 14 Mar 2025, 10:38 | 8.47 | 8.47 |
| 10 Feb 2025, 14:23 | 8.07 | 8.07 |
| 27 Jan 2025, 14:26 | 8.01 | 8.01 |
| 16 Dec 2024, 11:28 | 8.11 | 8.11 |
| 21 Oct 2024, 12:54 | 7.84 | 7.84 |
| 25 Sep 2024, 11:32 | 7.84 | 7.84 |
| 22 Aug 2024, 11:51 | 7.86 | 7.86 |
| 15 Jul 2024, 13:55 | 7.82 | 7.82 |
| 21 Jun 2024, 15:25 | 7.83 | 7.83 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2026, 10:22 | 0.059 | 0.059 mg/l |
| 12 Jun 2026, 10:43 | 0.033 | 0.033 mg/l |
| 22 May 2026, 12:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Apr 2026, 09:43 | 0.056 | 0.056 mg/l |
| 6 Mar 2026, 14:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2026, 12:37 | 0.049 | 0.049 mg/l |
| 9 Jan 2026, 15:17 | 0.16 | 0.16 mg/l |
| 2 Dec 2025, 14:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Nov 2025, 14:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2025, 13:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Sep 2025, 11:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Aug 2025, 11:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jul 2025, 11:42 | 0.053 | 0.053 mg/l |
| 9 Jun 2025, 10:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 May 2025, 12:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Apr 2025, 13:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Mar 2025, 10:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Feb 2025, 14:23 | 0.084 | 0.084 mg/l |
| 27 Jan 2025, 14:26 | 0.056 | 0.056 mg/l |
| 16 Dec 2024, 11:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Oct 2024, 12:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Sep 2024, 11:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2024, 11:51 | 0.054 | 0.054 mg/l |
| 15 Jul 2024, 13:55 | 0.032 | 0.032 mg/l |
| 21 Jun 2024, 15:25 | 0.035 | 0.035 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.366 mg/l
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | 0.366 | 0.366 mg/l |
| 1 Jul 2026, 10:22 | 0.738 | 0.738 mg/l |
| 12 Jun 2026, 10:43 | 3.78 | 3.78 mg/l |
| 22 May 2026, 12:42 | 4.49 | 4.49 mg/l |
| 27 Apr 2026, 09:43 | 5.88 | 5.88 mg/l |
| 6 Mar 2026, 14:06 | 7.39 | 7.39 mg/l |
| 17 Feb 2026, 12:37 | 5.78 | 5.78 mg/l |
| 9 Jan 2026, 15:17 | 9.18 | 9.18 mg/l |
| 2 Dec 2025, 14:13 | 15 | 15 mg/l |
| 4 Nov 2025, 14:12 | 4.69 | 4.69 mg/l |
| 8 Oct 2025, 13:06 | 4.18 | 4.18 mg/l |
| 3 Sep 2025, 11:34 | 2.99 | 2.99 mg/l |
| 20 Aug 2025, 11:07 | 1.4 | 1.4 mg/l |
| 4 Jul 2025, 11:42 | 1.39 | 1.39 mg/l |
| 9 Jun 2025, 10:48 | 3.89 | 3.89 mg/l |
| 6 May 2025, 12:26 | 4.78 | 4.78 mg/l |
| 4 Apr 2025, 13:47 | 6.48 | 6.48 mg/l |
| 14 Mar 2025, 10:38 | 6.79 | 6.79 mg/l |
| 10 Feb 2025, 14:23 | 4.48 | 4.48 mg/l |
| 27 Jan 2025, 14:26 | 4.18 | 4.18 mg/l |
| 16 Dec 2024, 11:28 | 6.78 | 6.78 mg/l |
| 21 Oct 2024, 12:54 | 5.59 | 5.59 mg/l |
| 25 Sep 2024, 11:32 | 12.9 | 12.9 mg/l |
| 22 Aug 2024, 11:51 | 3.19 | 3.19 mg/l |
| 15 Jul 2024, 13:55 | 4.89 | 4.89 mg/l |
| 21 Jun 2024, 15:25 | 4.78 | 4.78 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.49 mg/l
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | 0.49 | 0.49 mg/l |
| 1 Jul 2026, 10:22 | 0.52 | 0.52 mg/l |
| 12 Jun 2026, 10:43 | 0.18 | 0.18 mg/l |
| 22 May 2026, 12:42 | 0.24 | 0.24 mg/l |
| 27 Apr 2026, 09:43 | 0.23 | 0.23 mg/l |
| 6 Mar 2026, 14:06 | 0.11 | 0.11 mg/l |
| 17 Feb 2026, 12:37 | 0.084 | 0.084 mg/l |
| 9 Jan 2026, 15:17 | 0.2 | 0.2 mg/l |
| 2 Dec 2025, 14:13 | 0.16 | 0.16 mg/l |
| 4 Nov 2025, 14:12 | 0.44 | 0.44 mg/l |
| 8 Oct 2025, 13:06 | 0.62 | 0.62 mg/l |
| 3 Sep 2025, 11:34 | 0.52 | 0.52 mg/l |
| 20 Aug 2025, 11:07 | 0.48 | 0.48 mg/l |
| 4 Jul 2025, 11:42 | 0.48 | 0.48 mg/l |
| 9 Jun 2025, 10:48 | 0.3 | 0.3 mg/l |
| 6 May 2025, 12:26 | 0.27 | 0.27 mg/l |
| 4 Apr 2025, 13:47 | 0.12 | 0.12 mg/l |
| 14 Mar 2025, 10:38 | 0.13 | 0.13 mg/l |
| 10 Feb 2025, 14:23 | 0.095 | 0.095 mg/l |
| 27 Jan 2025, 14:26 | 0.11 | 0.11 mg/l |
| 16 Dec 2024, 11:28 | 0.11 | 0.11 mg/l |
| 21 Oct 2024, 12:54 | 0.12 | 0.12 mg/l |
| 25 Sep 2024, 11:32 | 0.22 | 0.22 mg/l |
| 22 Aug 2024, 11:51 | 0.42 | 0.42 mg/l |
| 15 Jul 2024, 13:55 | 0.27 | 0.27 mg/l |
| 21 Jun 2024, 15:25 | 0.27 | 0.27 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
887 µS/cm
Sampled 10 Aug 2026, 52 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 12:43 | 887 | 887 µS/cm |
| 1 Jul 2026, 10:22 | 731 | 731 µS/cm |
| 12 Jun 2026, 10:43 | 670 | 670 µS/cm |
| 22 May 2026, 12:42 | 736 | 736 µS/cm |
| 27 Apr 2026, 09:43 | 711 | 711 µS/cm |
| 6 Mar 2026, 14:06 | 692 | 692 µS/cm |
| 17 Feb 2026, 12:37 | 541 | 541 µS/cm |
| 9 Jan 2026, 15:17 | 514 | 514 µS/cm |
| 2 Dec 2025, 14:13 | 779 | 779 µS/cm |
| 4 Nov 2025, 14:12 | 851 | 851 µS/cm |
| 8 Oct 2025, 13:06 | 828 | 828 µS/cm |
| 3 Sep 2025, 11:34 | 809 | 809 µS/cm |
| 20 Aug 2025, 11:07 | 782 | 782 µS/cm |
| 4 Jul 2025, 11:42 | 734 | 734 µS/cm |
| 9 Jun 2025, 10:48 | 706 | 706 µS/cm |
| 6 May 2025, 12:26 | 731 | 731 µS/cm |
| 4 Apr 2025, 13:47 | 733 | 733 µS/cm |
| 14 Mar 2025, 10:38 | 740 | 740 µS/cm |
| 10 Feb 2025, 14:23 | 486 | 486 µS/cm |
| 27 Jan 2025, 14:26 | 378 | 378 µS/cm |
| 16 Dec 2024, 11:28 | 680 | 680 µS/cm |
| 21 Oct 2024, 12:54 | 616 | 616 µS/cm |
| 25 Sep 2024, 11:32 | 487 | 487 µS/cm |
| 22 Aug 2024, 11:51 | 765 | 765 µS/cm |
| 15 Jul 2024, 13:55 | 764 | 764 µS/cm |
| 21 Jun 2024, 15:25 | 730 | 730 µS/cm |
Everything measured here
22 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 22 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 26 | Jun 2024 – Aug 2026 | 60.7% 10 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 26 | Jun 2024 – Aug 2026 | 5.86 mg/l 10 Aug 2026 |
| Temperature of Water 0076 | River water | 26 | Jun 2024 – Aug 2026 | 16.9 °C 10 Aug 2026 |
| pH 0061 | River water | 26 | Jun 2024 – Aug 2026 | 7.62 10 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Jun 2024 – Aug 2026 | below 0.03 mg/l 10 Aug 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Aug 2026 | 0.366 mg/l 10 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 26 | Jun 2024 – Aug 2026 | 0.49 mg/l 10 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 26 | Jun 2024 – Aug 2026 | 887 µS/cm 10 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 26 | Jun 2024 – Aug 2026 | 220 mg/l 10 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Jun 2024 – Aug 2026 | below 0.00038 mg/l 10 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Jun 2024 – May 2026 | 1.7 mg/l 22 May 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 8 | Jan 2026 – Aug 2026 | 6.7 mg/l 10 Aug 2026 |
| Chloride 0172 | River water | 8 | Jan 2026 – Aug 2026 | 74 mg/l 10 Aug 2026 |
| Flow Type 2896 | River water | 7 | Jan 2026 – Aug 2026 | Moderate Flow 10 Aug 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 3 | Feb 2026 – Aug 2026 | 1 text result 10 Aug 2026 |
| LCMS Screen : Semi Quantitative 7299 | River water | 1 | Jun 2026 – Jun 2026 | 1 text result 12 Jun 2026 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Aug 2026 | below 0.004 mg/l 10 Aug 2026 |
| Nitrogen, Total as N 9686 | River water | 8 | Jan 2026 – Aug 2026 | 1.4 mg/l 10 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Jun 2024 – Aug 2026 | 0.37 mg/l 10 Aug 2026 |
| Phosphorus, Total as P 0348 | River water | 8 | Jan 2026 – Aug 2026 | 0.7 mg/l 10 Aug 2026 |
| Silica, reactive as SiO2 0182 | River water | 8 | Jan 2026 – Aug 2026 | 8.8 mg/l 10 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 8 | Jan 2026 – Aug 2026 | 40 mg/l 10 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.