River Slea Bonemill Bridge
EA name: R.SLEA BONEMILL BRIDGE
Environment Agency sampling point AN-SLEA3 · 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
- 4 Apr 2025, 09:0918 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 8 Oct 2026 and had nothing newer.
- Samples banked
- 19 since 16 Oct 2023 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 508439, 347115As published, to the nearest 1 m. Open in a map
- River, by its own name
- Slea
- River, by the map
- River SleaPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- LEASINGHAM MILL R SLEA GS 1.4 km along the river
- Nearest gauge upstream
- Slea Tilting Gate On the River Slea · 2.2 km along the river
- Why it was sampled
- Monitoring (national agency policy) (19 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
101.9%
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | 101.9 | 101.9% |
| 3 Mar 2025, 09:59 | 96.9 | 96.9% |
| 14 Feb 2025, 10:03 | 99.7 | 99.7% |
| 28 Jan 2025, 11:04 | 95.6 | 95.6% |
| 4 Dec 2024, 10:54 | 97.9 | 97.9% |
| 19 Nov 2024, 10:02 | 95.4 | 95.4% |
| 23 Oct 2024, 10:50 | 99.9 | 99.9% |
| 20 Sep 2024, 09:38 | 74.3 | 74.3% |
| 19 Aug 2024, 09:57 | 88.4 | 88.4% |
| 16 Jul 2024, 09:24 | 83 | 83% |
| 18 Jun 2024, 10:37 | 104.8 | 104.8% |
| 14 May 2024, 10:16 | 87.1 | 87.1% |
| 15 Apr 2024, 10:54 | 99.4 | 99.4% |
| 18 Mar 2024, 09:26 | 98.2 | 98.2% |
| 19 Feb 2024, 14:00 | 92.7 | 92.7% |
| 15 Jan 2024, 10:33 | 89.8 | 89.8% |
| 4 Dec 2023, 10:17 | 92.6 | 92.6% |
| 21 Nov 2023, 10:50 | 93.2 | 93.2% |
| 16 Oct 2023, 09:32 | 93.5 | 93.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.7 mg/l
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | 11.7 | 11.7 mg/l |
| 3 Mar 2025, 09:59 | 11.3 | 11.3 mg/l |
| 14 Feb 2025, 10:03 | 11.7 | 11.7 mg/l |
| 28 Jan 2025, 11:04 | 11 | 11 mg/l |
| 4 Dec 2024, 10:54 | 11.4 | 11.4 mg/l |
| 19 Nov 2024, 10:02 | 11.3 | 11.3 mg/l |
| 23 Oct 2024, 10:50 | 11.3 | 11.3 mg/l |
| 20 Sep 2024, 09:38 | 7.71 | 7.71 mg/l |
| 19 Aug 2024, 09:57 | 9.09 | 9.09 mg/l |
| 16 Jul 2024, 09:24 | 8.76 | 8.76 mg/l |
| 18 Jun 2024, 10:37 | 11.4 | 11.4 mg/l |
| 14 May 2024, 10:16 | 9.45 | 9.45 mg/l |
| 15 Apr 2024, 10:54 | 11.2 | 11.2 mg/l |
| 18 Mar 2024, 09:26 | 11.1 | 11.1 mg/l |
| 19 Feb 2024, 14:00 | 10.5 | 10.5 mg/l |
| 15 Jan 2024, 10:33 | 10.9 | 10.9 mg/l |
| 4 Dec 2023, 10:17 | 10.7 | 10.7 mg/l |
| 21 Nov 2023, 10:50 | 10.4 | 10.4 mg/l |
| 16 Oct 2023, 09:32 | 10.8 | 10.8 mg/l |
Water temperature
code 0076 · °C
9.1 °C
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | 9.1 | 9.1 °C |
| 3 Mar 2025, 09:59 | 8.5 | 8.5 °C |
| 14 Feb 2025, 10:03 | 8.2 | 8.2 °C |
| 28 Jan 2025, 11:04 | 9.3 | 9.3 °C |
| 4 Dec 2024, 10:54 | 8.8 | 8.8 °C |
| 19 Nov 2024, 10:02 | 7.8 | 7.8 °C |
| 23 Oct 2024, 10:50 | 9.9 | 9.9 °C |
| 20 Sep 2024, 09:38 | 13.6 | 13.6 °C |
| 19 Aug 2024, 09:57 | 14 | 14 °C |
| 16 Jul 2024, 09:24 | 12.8 | 12.8 °C |
| 18 Jun 2024, 10:37 | 11.4 | 11.4 °C |
| 14 May 2024, 10:16 | 11.6 | 11.6 °C |
| 15 Apr 2024, 10:54 | 10.1 | 10.1 °C |
| 18 Mar 2024, 09:26 | 9.7 | 9.7 °C |
| 19 Feb 2024, 14:00 | 9.7 | 9.7 °C |
| 15 Jan 2024, 10:33 | 6.8 | 6.8 °C |
| 4 Dec 2023, 10:17 | 9 | 9 °C |
| 21 Nov 2023, 10:50 | 10.4 | 10.4 °C |
| 16 Oct 2023, 09:32 | 8.8 | 8.8 °C |
pH
code 0061
7.81
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | 7.81 | 7.81 |
| 3 Mar 2025, 09:59 | 7.71 | 7.71 |
| 14 Feb 2025, 10:03 | 7.29 | 7.29 |
| 28 Jan 2025, 11:04 | 7.63 | 7.63 |
| 4 Dec 2024, 10:54 | 7.78 | 7.78 |
| 19 Nov 2024, 10:02 | 7.75 | 7.75 |
| 23 Oct 2024, 10:50 | 8.01 | 8.01 |
| 20 Sep 2024, 09:38 | 7.82 | 7.82 |
| 19 Aug 2024, 09:57 | 7.94 | 7.94 |
| 16 Jul 2024, 09:24 | 7.53 | 7.53 |
| 18 Jun 2024, 10:37 | 7.84 | 7.84 |
| 14 May 2024, 10:16 | 7.62 | 7.62 |
| 15 Apr 2024, 10:54 | 7.72 | 7.72 |
| 18 Mar 2024, 09:26 | 7.65 | 7.65 |
| 19 Feb 2024, 14:00 | 7.67 | 7.67 |
| 15 Jan 2024, 10:33 | 7.76 | 7.76 |
| 4 Dec 2023, 10:17 | 7.49 | 7.49 |
| 21 Nov 2023, 10:50 | 7.73 | 7.73 |
| 16 Oct 2023, 09:32 | 7.85 | 7.85 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2025, 09:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Feb 2025, 10:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Jan 2025, 11:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2024, 10:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2024, 10:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Oct 2024, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Sep 2024, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2024, 09:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jul 2024, 09:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jun 2024, 10:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 May 2024, 10:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Apr 2024, 10:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2024, 09:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2024, 14:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2024, 10:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2023, 10:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Nov 2023, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2023, 09:32 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
13 mg/l
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | 13 | 13 mg/l |
| 3 Mar 2025, 09:59 | 13 | 13 mg/l |
| 14 Feb 2025, 10:03 | 14 | 14 mg/l |
| 28 Jan 2025, 11:04 | 14 | 14 mg/l |
| 4 Dec 2024, 10:54 | 13 | 13 mg/l |
| 19 Nov 2024, 10:02 | 13 | 13 mg/l |
| 23 Oct 2024, 10:50 | 13 | 13 mg/l |
| 20 Sep 2024, 09:38 | 11 | 11 mg/l |
| 19 Aug 2024, 09:57 | 12 | 12 mg/l |
| 16 Jul 2024, 09:24 | 9.97 | 9.97 mg/l |
| 18 Jun 2024, 10:37 | 13 | 13 mg/l |
| 14 May 2024, 10:16 | 13 | 13 mg/l |
| 15 Apr 2024, 10:54 | 14 | 14 mg/l |
| 18 Mar 2024, 09:26 | 14 | 14 mg/l |
| 19 Feb 2024, 14:00 | 14 | 14 mg/l |
| 15 Jan 2024, 10:33 | 15 | 15 mg/l |
| 4 Dec 2023, 10:17 | 13 | 13 mg/l |
| 21 Nov 2023, 10:50 | 14 | 14 mg/l |
| 16 Oct 2023, 09:32 | 13 | 13 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.01 mg/l (not detected above this)
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Mar 2025, 09:59 | <0.01 | below 0.01 mg/l (not detected above this) |
| 14 Feb 2025, 10:03 | 0.051 | 0.051 mg/l |
| 28 Jan 2025, 11:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Dec 2024, 10:54 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Nov 2024, 10:02 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Oct 2024, 10:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Sep 2024, 09:38 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Aug 2024, 09:57 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Jul 2024, 09:24 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Jun 2024, 10:37 | <0.01 | below 0.01 mg/l (not detected above this) |
| 14 May 2024, 10:16 | <0.01 | below 0.01 mg/l (not detected above this) |
| 15 Apr 2024, 10:54 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Mar 2024, 09:26 | 0.011 | 0.011 mg/l |
| 19 Feb 2024, 14:00 | 0.01 | 0.01 mg/l |
| 15 Jan 2024, 10:33 | 0.036 | 0.036 mg/l |
| 4 Dec 2023, 10:17 | 0.022 | 0.022 mg/l |
| 21 Nov 2023, 10:50 | 0.016 | 0.016 mg/l |
| 16 Oct 2023, 09:32 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
818 µS/cm
Sampled 4 Apr 2025, 18 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Apr 2025, 09:09 | 818 | 818 µS/cm |
| 3 Mar 2025, 09:59 | 821 | 821 µS/cm |
| 14 Feb 2025, 10:03 | 813 | 813 µS/cm |
| 28 Jan 2025, 11:04 | 835 | 835 µS/cm |
| 4 Dec 2024, 10:54 | 833 | 833 µS/cm |
| 19 Nov 2024, 10:02 | 817 | 817 µS/cm |
| 23 Oct 2024, 10:50 | 835 | 835 µS/cm |
| 20 Sep 2024, 09:38 | 839 | 839 µS/cm |
| 19 Aug 2024, 09:57 | 815 | 815 µS/cm |
| 16 Jul 2024, 09:24 | 720 | 720 µS/cm |
| 18 Jun 2024, 10:37 | 825 | 825 µS/cm |
| 14 May 2024, 10:16 | 806 | 806 µS/cm |
| 15 Apr 2024, 10:54 | 818 | 818 µS/cm |
| 18 Mar 2024, 09:26 | 830 | 830 µS/cm |
| 19 Feb 2024, 14:00 | 806 | 806 µS/cm |
| 15 Jan 2024, 10:33 | 823 | 823 µS/cm |
| 4 Dec 2023, 10:17 | 801 | 801 µS/cm |
| 21 Nov 2023, 10:50 | 853 | 853 µS/cm |
| 16 Oct 2023, 09:32 | 847 | 847 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 | 19 | Oct 2023 – Apr 2025 | 101.9% 4 Apr 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 19 | Oct 2023 – Apr 2025 | 11.7 mg/l 4 Apr 2025 |
| Temperature of Water 0076 | River water | 19 | Oct 2023 – Apr 2025 | 9.1 °C 4 Apr 2025 |
| pH 0061 | River water | 19 | Oct 2023 – Apr 2025 | 7.81 4 Apr 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 19 | Oct 2023 – Apr 2025 | below 0.03 mg/l 4 Apr 2025 |
| Nitrate as N 0117 | River water | 19 | Oct 2023 – Apr 2025 | 13 mg/l 4 Apr 2025 |
| Orthophosphate, reactive as P 0180 | River water | 19 | Oct 2023 – Apr 2025 | below 0.01 mg/l 4 Apr 2025 |
| Conductivity at 25 C 0077 | River water | 19 | Oct 2023 – Apr 2025 | 818 µS/cm 4 Apr 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 19 | Oct 2023 – Apr 2025 | 220 mg/l 4 Apr 2025 |
| Ammonia un-ionised as N 0119 | River water | 19 | Oct 2023 – Apr 2025 | below 0.00033 mg/l 4 Apr 2025 |
| BOD : 5 Day ATU 0085 | River water | 15 | Feb 2024 – Apr 2025 | 1.9 mg/l 4 Apr 2025 |
| Nitrite as N 0118 | River water | 19 | Oct 2023 – Apr 2025 | 0.0085 mg/l 4 Apr 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 19 | Oct 2023 – Apr 2025 | 13 mg/l 4 Apr 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.