Colne at Marsden upstream of Wessenden Brook
EA name: COLNE AT MARSDEN U/S WESSENDEN BROOK
Environment Agency sampling point NE-49500639 · 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
- 17 Sep 2026, 11:1614 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 27 since 17 Jul 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 404796, 411661As published, to the nearest 1 m. Open in a map
- River, by its own name
- Colne
- River, by the map
- River ColnePlaced on the river its name gives, 10 m from the line.
- Next gauge downstream
- Marsden On the River Colne · 0.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (21 samples)
Environmental monitoring statutory (EU directives) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
99.9%
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | 99.9 | 99.9% |
| 4 Aug 2026, 10:10 | 102.3 | 102.3% |
| 1 Jul 2026, 10:04 | 101.9 | 101.9% |
| 4 Jun 2026, 13:04 | 99.7 | 99.7% |
| 15 May 2026, 09:27 | 101.9 | 101.9% |
| 14 Apr 2026, 11:46 | 103.5 | 103.5% |
| 9 Mar 2026, 09:26 | 98.7 | 98.7% |
| 3 Feb 2026, 10:52 | 102.6 | 102.6% |
| 6 Jan 2026, 10:51 | 98.2 | 98.2% |
| 18 Dec 2025, 09:56 | 100.5 | 100.5% |
| 28 Nov 2025, 10:21 | 101.1 | 101.1% |
| 3 Nov 2025, 11:33 | 101.3 | 101.3% |
| 1 Sep 2025, 09:50 | 101.9 | 101.9% |
| 8 Aug 2025, 09:17 | 104.3 | 104.3% |
| 10 Jul 2025, 09:38 | 102.8 | 102.8% |
| 23 Jun 2025, 14:05 | 103 | 103% |
| 6 May 2025, 10:15 | 101.9 | 101.9% |
| 2 Apr 2025, 11:50 | 102.8 | 102.8% |
| 12 Mar 2025, 10:50 | 102 | 102% |
| 25 Feb 2025, 12:01 | 101.3 | 101.3% |
| 24 Jan 2025, 11:01 | 102.9 | 102.9% |
| 4 Dec 2024, 12:10 | 100.3 | 100.3% |
| 19 Nov 2024, 12:54 | 114.4 | 114.4% |
| 17 Oct 2024, 10:49 | 102 | 102% |
| 30 Sep 2024, 11:17 | 101.1 | 101.1% |
| 19 Aug 2024, 13:36 | 102.2 | 102.2% |
| 17 Jul 2024, 13:27 | 102.8 | 102.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.4 mg/l
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | 10.4 | 10.4 mg/l |
| 4 Aug 2026, 10:10 | 9.7 | 9.7 mg/l |
| 1 Jul 2026, 10:04 | 9.7 | 9.7 mg/l |
| 4 Jun 2026, 13:04 | 10.4 | 10.4 mg/l |
| 15 May 2026, 09:27 | 11.8 | 11.8 mg/l |
| 14 Apr 2026, 11:46 | 12.1 | 12.1 mg/l |
| 9 Mar 2026, 09:26 | 11.8 | 11.8 mg/l |
| 3 Feb 2026, 10:52 | 13.3 | 13.3 mg/l |
| 6 Jan 2026, 10:51 | 13.3 | 13.3 mg/l |
| 18 Dec 2025, 09:56 | 12 | 12 mg/l |
| 28 Nov 2025, 10:21 | 12.1 | 12.1 mg/l |
| 3 Nov 2025, 11:33 | 11.4 | 11.4 mg/l |
| 1 Sep 2025, 09:50 | 10.9 | 10.9 mg/l |
| 8 Aug 2025, 09:17 | 10.4 | 10.4 mg/l |
| 10 Jul 2025, 09:38 | 10.1 | 10.1 mg/l |
| 23 Jun 2025, 14:05 | 10.4 | 10.4 mg/l |
| 6 May 2025, 10:15 | 11.8 | 11.8 mg/l |
| 2 Apr 2025, 11:50 | 11.9 | 11.9 mg/l |
| 12 Mar 2025, 10:50 | 13.1 | 13.1 mg/l |
| 25 Feb 2025, 12:01 | 12.7 | 12.7 mg/l |
| 24 Jan 2025, 11:01 | 13 | 13 mg/l |
| 4 Dec 2024, 12:10 | 12.3 | 12.3 mg/l |
| 19 Nov 2024, 12:54 | 14.9 | 14.9 mg/l |
| 17 Oct 2024, 10:49 | 11.3 | 11.3 mg/l |
| 30 Sep 2024, 11:17 | 11.4 | 11.4 mg/l |
| 19 Aug 2024, 13:36 | 10.2 | 10.2 mg/l |
| 17 Jul 2024, 13:27 | 10.3 | 10.3 mg/l |
Water temperature
code 0076 · °C
13.3 °C
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | 13.3 | 13.3 °C |
| 4 Aug 2026, 10:10 | 17.8 | 17.8 °C |
| 1 Jul 2026, 10:04 | 17.6 | 17.6 °C |
| 4 Jun 2026, 13:04 | 13.5 | 13.5 °C |
| 15 May 2026, 09:27 | 8.8 | 8.8 °C |
| 14 Apr 2026, 11:46 | 8.3 | 8.3 °C |
| 9 Mar 2026, 09:26 | 7.4 | 7.4 °C |
| 3 Feb 2026, 10:52 | 4.3 | 4.3 °C |
| 6 Jan 2026, 10:51 | 2.6 | 2.6 °C |
| 18 Dec 2025, 09:56 | 7.6 | 7.6 °C |
| 28 Nov 2025, 10:21 | 7.4 | 7.4 °C |
| 3 Nov 2025, 11:33 | 10 | 10 °C |
| 1 Sep 2025, 09:50 | 12.2 | 12.2 °C |
| 8 Aug 2025, 09:17 | 15.6 | 15.6 °C |
| 10 Jul 2025, 09:38 | 16.3 | 16.3 °C |
| 23 Jun 2025, 14:05 | 14.7 | 14.7 °C |
| 6 May 2025, 10:15 | 8.8 | 8.8 °C |
| 2 Apr 2025, 11:50 | 9 | 9 °C |
| 12 Mar 2025, 10:50 | 4.8 | 4.8 °C |
| 25 Feb 2025, 12:01 | 5.7 | 5.7 °C |
| 24 Jan 2025, 11:01 | 5.3 | 5.3 °C |
| 4 Dec 2024, 12:10 | 6.5 | 6.5 °C |
| 19 Nov 2024, 12:54 | 4.2 | 4.2 °C |
| 17 Oct 2024, 10:49 | 10.7 | 10.7 °C |
| 30 Sep 2024, 11:17 | 9.9 | 9.9 °C |
| 19 Aug 2024, 13:36 | 15.2 | 15.2 °C |
| 17 Jul 2024, 13:27 | 15.2 | 15.2 °C |
pH
code 0061
7.44
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | 7.44 | 7.44 |
| 4 Aug 2026, 10:10 | 7.96 | 7.96 |
| 1 Jul 2026, 10:04 | 7.71 | 7.71 |
| 4 Jun 2026, 13:04 | 7.67 | 7.67 |
| 15 May 2026, 09:27 | 7.87 | 7.87 |
| 14 Apr 2026, 11:46 | 7.56 | 7.56 |
| 9 Mar 2026, 09:26 | 7.98 | 7.98 |
| 3 Feb 2026, 10:52 | 7.16 | 7.16 |
| 6 Jan 2026, 10:51 | 6.74 | 6.74 |
| 18 Dec 2025, 09:56 | 7.86 | 7.86 |
| 28 Nov 2025, 10:21 | 7.61 | 7.61 |
| 3 Nov 2025, 11:33 | 7.91 | 7.91 |
| 1 Sep 2025, 09:50 | 7.25 | 7.25 |
| 8 Aug 2025, 09:17 | 7.83 | 7.83 |
| 10 Jul 2025, 09:38 | 7.63 | 7.63 |
| 23 Jun 2025, 14:05 | 7.69 | 7.69 |
| 6 May 2025, 10:15 | 8.12 | 8.12 |
| 2 Apr 2025, 11:50 | 8.04 | 8.04 |
| 12 Mar 2025, 10:50 | 7.87 | 7.87 |
| 25 Feb 2025, 12:01 | 7.52 | 7.52 |
| 24 Jan 2025, 11:01 | 7.65 | 7.65 |
| 4 Dec 2024, 12:10 | 7.49 | 7.49 |
| 19 Nov 2024, 12:54 | 7.64 | 7.64 |
| 17 Oct 2024, 10:49 | 7.2 | 7.2 |
| 30 Sep 2024, 11:17 | 7.98 | 7.98 |
| 19 Aug 2024, 13:36 | 7.92 | 7.92 |
| 17 Jul 2024, 13:27 | 7.53 | 7.53 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Aug 2026, 10:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2026, 10:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2026, 13:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 May 2026, 09:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Apr 2026, 11:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Mar 2026, 09:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2026, 10:52 | 0.038 | 0.038 mg/l |
| 6 Jan 2026, 10:51 | 0.047 | 0.047 mg/l |
| 18 Dec 2025, 09:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Nov 2025, 10:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 11:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Sep 2025, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Aug 2025, 09:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jul 2025, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jun 2025, 14:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 May 2025, 10:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Apr 2025, 11:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2025, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Feb 2025, 12:01 | 0.03 | 0.03 mg/l |
| 24 Jan 2025, 11:01 | 0.046 | 0.046 mg/l |
| 4 Dec 2024, 12:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2024, 12:54 | 0.035 | 0.035 mg/l |
| 17 Oct 2024, 10:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Sep 2024, 11:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2024, 13:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 13:27 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.316 mg/l
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | 0.316 | 0.316 mg/l |
| 4 Aug 2026, 10:10 | 0.426 | 0.426 mg/l |
| 1 Jul 2026, 10:04 | 0.386 | 0.386 mg/l |
| 4 Jun 2026, 13:04 | 0.356 | 0.356 mg/l |
| 15 May 2026, 09:27 | 0.326 | 0.326 mg/l |
| 14 Apr 2026, 11:46 | 0.416 | 0.416 mg/l |
| 9 Mar 2026, 09:26 | 0.406 | 0.406 mg/l |
| 3 Feb 2026, 10:52 | 0.506 | 0.506 mg/l |
| 6 Jan 2026, 10:51 | 0.456 | 0.456 mg/l |
| 18 Dec 2025, 09:56 | 0.396 | 0.396 mg/l |
| 28 Nov 2025, 10:21 | 0.586 | 0.586 mg/l |
| 3 Nov 2025, 11:33 | 0.446 | 0.446 mg/l |
| 1 Sep 2025, 09:50 | 0.506 | 0.506 mg/l |
| 8 Aug 2025, 09:17 | 0.436 | 0.436 mg/l |
| 10 Jul 2025, 09:38 | 0.436 | 0.436 mg/l |
| 23 Jun 2025, 14:05 | 0.406 | 0.406 mg/l |
| 6 May 2025, 10:15 | 0.406 | 0.406 mg/l |
| 2 Apr 2025, 11:50 | 0.346 | 0.346 mg/l |
| 12 Mar 2025, 10:50 | 0.366 | 0.366 mg/l |
| 25 Feb 2025, 12:01 | 0.416 | 0.416 mg/l |
| 24 Jan 2025, 11:01 | 0.326 | 0.326 mg/l |
| 4 Dec 2024, 12:10 | 0.586 | 0.586 mg/l |
| 19 Nov 2024, 12:54 | 0.276 | 0.276 mg/l |
| 17 Oct 2024, 10:49 | 0.206 | 0.206 mg/l |
| 30 Sep 2024, 11:17 | 0.286 | 0.286 mg/l |
| 19 Aug 2024, 13:36 | 0.366 | 0.366 mg/l |
| 17 Jul 2024, 13:27 | 0.226 | 0.226 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.023 mg/l
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | 0.023 | 0.023 mg/l |
| 4 Aug 2026, 10:10 | <0.01 | below 0.01 mg/l (not detected above this) |
| 1 Jul 2026, 10:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Jun 2026, 13:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 15 May 2026, 09:27 | <0.01 | below 0.01 mg/l (not detected above this) |
| 14 Apr 2026, 11:46 | 0.01 | 0.01 mg/l |
| 9 Mar 2026, 09:26 | 0.017 | 0.017 mg/l |
| 3 Feb 2026, 10:52 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Jan 2026, 10:51 | 0.012 | 0.012 mg/l |
| 18 Dec 2025, 09:56 | <0.01 | below 0.01 mg/l (not detected above this) |
| 28 Nov 2025, 10:21 | 0.011 | 0.011 mg/l |
| 3 Nov 2025, 11:33 | <0.01 | below 0.01 mg/l (not detected above this) |
| 1 Sep 2025, 09:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 8 Aug 2025, 09:17 | <0.01 | below 0.01 mg/l (not detected above this) |
| 10 Jul 2025, 09:38 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Jun 2025, 14:05 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 May 2025, 10:15 | 0.011 | 0.011 mg/l |
| 2 Apr 2025, 11:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 12 Mar 2025, 10:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 25 Feb 2025, 12:01 | 0.01 | 0.01 mg/l |
| 24 Jan 2025, 11:01 | 0.014 | 0.014 mg/l |
| 4 Dec 2024, 12:10 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Nov 2024, 12:54 | 0.022 | 0.022 mg/l |
| 17 Oct 2024, 10:49 | 0.02 | 0.02 mg/l |
| 30 Sep 2024, 11:17 | 0.024 | 0.024 mg/l |
| 19 Aug 2024, 13:36 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Jul 2024, 13:27 | 0.021 | 0.021 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
109 µS/cm
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 11:16 | 109 | 109 µS/cm |
| 4 Aug 2026, 10:10 | 125 | 125 µS/cm |
| 1 Jul 2026, 10:04 | 1175 | 1175 µS/cm |
| 4 Jun 2026, 13:04 | 115 | 115 µS/cm |
| 15 May 2026, 09:27 | 106 | 106 µS/cm |
| 14 Apr 2026, 11:46 | 85 | 85 µS/cm |
| 9 Mar 2026, 09:26 | 83 | 83 µS/cm |
| 3 Feb 2026, 10:52 | 83 | 83 µS/cm |
| 6 Jan 2026, 10:51 | 119 | 119 µS/cm |
| 18 Dec 2025, 09:56 | 69 | 69 µS/cm |
| 28 Nov 2025, 10:21 | 132 | 132 µS/cm |
| 3 Nov 2025, 11:33 | 101 | 101 µS/cm |
| 1 Sep 2025, 09:50 | 118 | 118 µS/cm |
| 8 Aug 2025, 09:17 | 135 | 135 µS/cm |
| 10 Jul 2025, 09:38 | 123 | 123 µS/cm |
| 23 Jun 2025, 14:05 | 129 | 129 µS/cm |
| 6 May 2025, 10:15 | 129 | 129 µS/cm |
| 2 Apr 2025, 11:50 | 138 | 138 µS/cm |
| 12 Mar 2025, 10:50 | 117 | 117 µS/cm |
| 25 Feb 2025, 12:01 | 106 | 106 µS/cm |
| 24 Jan 2025, 11:01 | 82 | 82 µS/cm |
| 4 Dec 2024, 12:10 | 102 | 102 µS/cm |
| 19 Nov 2024, 12:54 | 122 | 122 µS/cm |
| 17 Oct 2024, 10:49 | 53 | 53 µS/cm |
| 30 Sep 2024, 11:17 | 117 | 117 µS/cm |
| 19 Aug 2024, 13:36 | 119 | 119 µS/cm |
| 17 Jul 2024, 13:27 | 88 | 88 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 | 27 | Jul 2024 – Sep 2026 | 99.9% 17 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 27 | Jul 2024 – Sep 2026 | 10.4 mg/l 17 Sep 2026 |
| Temperature of Water 0076 | River water | 27 | Jul 2024 – Sep 2026 | 13.3 °C 17 Sep 2026 |
| pH 0061 | River water | 27 | Jul 2024 – Sep 2026 | 7.44 17 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 27 | Jul 2024 – Sep 2026 | below 0.03 mg/l 17 Sep 2026 |
| Nitrate as N 0117 | River water | 27 | Jul 2024 – Sep 2026 | 0.316 mg/l 17 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 27 | Jul 2024 – Sep 2026 | 0.023 mg/l 17 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 27 | Jul 2024 – Sep 2026 | 109 µS/cm 17 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 27 | Jul 2024 – Sep 2026 | 18 mg/l 17 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 27 | Jul 2024 – Sep 2026 | below 0.0002 mg/l 17 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 24 | Jul 2024 – Jun 2026 | 1.4 mg/l 4 Jun 2026 |
| Nitrite as N 0118 | River water | 27 | Jul 2024 – Sep 2026 | below 0.004 mg/l 17 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Jul 2024 – Sep 2026 | 0.32 mg/l 17 Sep 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.