Marshwood, Clamerkin Brook
EA name: MARSHWOOD, CLAMERKIN BROOK
Environment Agency sampling point SO-Y0004529 · 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
- 28 Aug 2026, 09:5234 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 8 Apr 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 444352, 90487As published, to the nearest 1 m. Open in a map
- River, by its own name
- Marshwood
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 1 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Planned investigation (local monitoring) (28 samples)
2 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
86%
Sampled 12 Jun 2026, 4 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 86 | 86% |
| 24 Mar 2026, 11:44 | 99.1 | 99.1% |
| 25 Feb 2026, 11:48 | 93.3 | 93.3% |
| 22 Jan 2026, 11:15 | 98.2 | 98.2% |
| 9 Dec 2025, 12:10 | 93.2 | 93.2% |
| 11 Nov 2025, 10:55 | 94.3 | 94.3% |
| 24 Oct 2025, 10:29 | 93.7 | 93.7% |
| 24 Sep 2025, 15:07 | 89.9 | 89.9% |
| 13 Aug 2025, 10:06 | 35.8 | 35.8% |
| 2 Jul 2025, 10:03 | 42.7 | 42.7% |
| 4 Jun 2025, 11:57 | 57.6 | 57.6% |
| 9 May 2025, 09:48 | 53.4 | 53.4% |
| 1 Apr 2025, 10:04 | 97.8 | 97.8% |
| 3 Mar 2025, 10:03 | 95.6 | 95.6% |
| 4 Feb 2025, 09:46 | 93.1 | 93.1% |
| 16 Jan 2025, 10:29 | 92.9 | 92.9% |
| 16 Dec 2024, 10:12 | 90.7 | 90.7% |
| 6 Dec 2024, 08:52 | 94 | 94% |
| 26 Nov 2024, 09:30 | 96.4 | 96.4% |
| 30 Oct 2024, 09:28 | 91 | 91% |
| 30 Sep 2024, 09:38 | 95.1 | 95.1% |
| 23 Aug 2024, 08:28 | 55.9 | 55.9% |
| 26 Jul 2024, 08:48 | 79.2 | 79.2% |
| 12 Jun 2024, 11:02 | 78.1 | 78.1% |
| 22 May 2024, 10:05 | 83.2 | 83.2% |
| 8 Apr 2024, 12:06 | 96.5 | 96.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.78 mg/l
Sampled 12 Jun 2026, 4 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 8.78 | 8.78 mg/l |
| 24 Mar 2026, 11:44 | 11.2 | 11.2 mg/l |
| 25 Feb 2026, 11:48 | 10.4 | 10.4 mg/l |
| 22 Jan 2026, 11:15 | 11.4 | 11.4 mg/l |
| 9 Dec 2025, 12:10 | 10.1 | 10.1 mg/l |
| 11 Nov 2025, 10:55 | 10 | 10 mg/l |
| 24 Oct 2025, 10:29 | 10.4 | 10.4 mg/l |
| 24 Sep 2025, 15:07 | 9.6 | 9.6 mg/l |
| 13 Aug 2025, 10:06 | 3.42 | 3.42 mg/l |
| 2 Jul 2025, 10:03 | 4.05 | 4.05 mg/l |
| 4 Jun 2025, 11:57 | 5.95 | 5.95 mg/l |
| 9 May 2025, 09:48 | 6.09 | 6.09 mg/l |
| 1 Apr 2025, 10:04 | 11.5 | 11.5 mg/l |
| 3 Mar 2025, 10:03 | 12.3 | 12.3 mg/l |
| 4 Feb 2025, 09:46 | 11.3 | 11.3 mg/l |
| 16 Jan 2025, 10:29 | 11.6 | 11.6 mg/l |
| 16 Dec 2024, 10:12 | 10.4 | 10.4 mg/l |
| 6 Dec 2024, 08:52 | 11.1 | 11.1 mg/l |
| 26 Nov 2024, 09:30 | 11.7 | 11.7 mg/l |
| 30 Oct 2024, 09:28 | 9.52 | 9.52 mg/l |
| 30 Sep 2024, 09:38 | 9.69 | 9.69 mg/l |
| 23 Aug 2024, 08:28 | 5.43 | 5.43 mg/l |
| 26 Jul 2024, 08:48 | 7.93 | 7.93 mg/l |
| 12 Jun 2024, 11:02 | 8.32 | 8.32 mg/l |
| 22 May 2024, 10:05 | 8.77 | 8.77 mg/l |
Water temperature
code 0076 · °C
14.3 °C
Sampled 12 Jun 2026, 4 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 14.3 | 14.3 °C |
| 24 Mar 2026, 11:44 | 9.8 | 9.8 °C |
| 25 Feb 2026, 11:48 | 10.3 | 10.3 °C |
| 22 Jan 2026, 11:15 | 8.6 | 8.6 °C |
| 9 Dec 2025, 12:10 | 11.5 | 11.5 °C |
| 11 Nov 2025, 10:55 | 12.6 | 12.6 °C |
| 24 Oct 2025, 10:29 | 10.6 | 10.6 °C |
| 24 Sep 2025, 15:07 | 12.3 | 12.3 °C |
| 13 Aug 2025, 10:06 | 17.4 | 17.4 °C |
| 2 Jul 2025, 10:03 | 17.8 | 17.8 °C |
| 4 Jun 2025, 11:57 | 13.8 | 13.8 °C |
| 9 May 2025, 09:48 | 9.5 | 9.5 °C |
| 1 Apr 2025, 10:04 | 8.3 | 8.3 °C |
| 3 Mar 2025, 10:03 | 4.8 | 4.8 °C |
| 4 Feb 2025, 09:46 | 7.1 | 7.1 °C |
| 16 Jan 2025, 10:29 | 5.8 | 5.8 °C |
| 16 Dec 2024, 10:12 | 9.4 | 9.4 °C |
| 6 Dec 2024, 08:52 | 7.9 | 7.9 °C |
| 26 Nov 2024, 09:30 | 7.1 | 7.1 °C |
| 30 Oct 2024, 09:28 | 13.2 | 13.2 °C |
| 30 Sep 2024, 09:38 | 14.4 | 14.4 °C |
| 23 Aug 2024, 08:28 | 16.6 | 16.6 °C |
| 26 Jul 2024, 08:48 | 15.2 | 15.2 °C |
| 12 Jun 2024, 11:02 | 12.4 | 12.4 °C |
| 22 May 2024, 10:05 | 12.9 | 12.9 °C |
pH
code 0061
8.06
Sampled 12 Jun 2026, 4 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 8.06 | 8.06 |
| 24 Mar 2026, 11:44 | 7.98 | 7.98 |
| 25 Feb 2026, 11:48 | 7.86 | 7.86 |
| 22 Jan 2026, 11:15 | 8.14 | 8.14 |
| 9 Dec 2025, 12:10 | 7.6 | 7.6 |
| 11 Nov 2025, 10:55 | 7.67 | 7.67 |
| 24 Oct 2025, 10:29 | 7.6 | 7.6 |
| 24 Sep 2025, 15:07 | 8.46 | 8.46 |
| 13 Aug 2025, 10:06 | 7.91 | 7.91 |
| 2 Jul 2025, 10:03 | 7.94 | 7.94 |
| 4 Jun 2025, 11:57 | 7.88 | 7.88 |
| 9 May 2025, 09:48 | 7.93 | 7.93 |
| 1 Apr 2025, 10:04 | 8.04 | 8.04 |
| 3 Mar 2025, 10:03 | 7.94 | 7.94 |
| 4 Feb 2025, 09:46 | 7.6 | 7.6 |
| 16 Jan 2025, 10:29 | 7.66 | 7.66 |
| 16 Dec 2024, 10:12 | 7.73 | 7.73 |
| 6 Dec 2024, 08:52 | 7.71 | 7.71 |
| 26 Nov 2024, 09:30 | 7.46 | 7.46 |
| 30 Oct 2024, 09:28 | 7.95 | 7.95 |
| 30 Sep 2024, 09:38 | 7.48 | 7.48 |
| 23 Aug 2024, 08:28 | 8.04 | 8.04 |
| 26 Jul 2024, 08:48 | 8.21 | 8.21 |
| 12 Jun 2024, 11:02 | 8.37 | 8.37 |
| 22 May 2024, 10:05 | 7.99 | 7.99 |
| 8 Apr 2024, 12:06 | 7.73 | 7.73 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.073 mg/l
Sampled 12 Jun 2026, 4 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 0.073 | 0.073 mg/l |
| 24 Mar 2026, 11:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Feb 2026, 11:48 | 0.03 | 0.03 mg/l |
| 22 Jan 2026, 11:15 | 0.032 | 0.032 mg/l |
| 9 Dec 2025, 12:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Nov 2025, 10:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Oct 2025, 10:29 | 0.04 | 0.04 mg/l |
| 24 Sep 2025, 15:07 | 0.11 | 0.11 mg/l |
| 13 Aug 2025, 10:06 | 0.038 | 0.038 mg/l |
| 2 Jul 2025, 10:03 | 0.19 | 0.19 mg/l |
| 4 Jun 2025, 11:57 | 0.079 | 0.079 mg/l |
| 9 May 2025, 09:48 | 0.061 | 0.061 mg/l |
| 1 Apr 2025, 10:04 | 0.043 | 0.043 mg/l |
| 3 Mar 2025, 10:03 | 0.047 | 0.047 mg/l |
| 4 Feb 2025, 09:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2025, 10:29 | 0.26 | 0.26 mg/l |
| 16 Dec 2024, 10:12 | 0.052 | 0.052 mg/l |
| 6 Dec 2024, 08:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Oct 2024, 09:28 | 0.041 | 0.041 mg/l |
| 30 Sep 2024, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Aug 2024, 08:28 | 0.29 | 0.29 mg/l |
| 26 Jul 2024, 08:48 | 0.077 | 0.077 mg/l |
| 12 Jun 2024, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 May 2024, 10:05 | 0.081 | 0.081 mg/l |
| 8 Apr 2024, 12:06 | 0.097 | 0.097 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.668 mg/l
Sampled 12 Jun 2026, 4 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 0.668 | 0.668 mg/l |
| 24 Mar 2026, 11:44 | 0.705 | 0.705 mg/l |
| 25 Feb 2026, 11:48 | 0.406 | 0.406 mg/l |
| 22 Jan 2026, 11:15 | 0.465 | 0.465 mg/l |
| 9 Dec 2025, 12:10 | 0.306 | 0.306 mg/l |
| 11 Nov 2025, 10:55 | 0.426 | 0.426 mg/l |
| 24 Oct 2025, 10:29 | 3.59 | 3.59 mg/l |
| 24 Sep 2025, 15:07 | 1.38 | 1.38 mg/l |
| 13 Aug 2025, 10:06 | 0.464 | 0.464 mg/l |
| 2 Jul 2025, 10:03 | 0.192 | 0.192 mg/l |
| 4 Jun 2025, 11:57 | 0.828 | 0.828 mg/l |
| 9 May 2025, 09:48 | 1.67 | 1.67 mg/l |
| 1 Apr 2025, 10:04 | 0.855 | 0.855 mg/l |
| 3 Mar 2025, 10:03 | 0.513 | 0.513 mg/l |
| 4 Feb 2025, 09:46 | 0.473 | 0.473 mg/l |
| 16 Jan 2025, 10:29 | 0.527 | 0.527 mg/l |
| 16 Dec 2024, 10:12 | 0.518 | 0.518 mg/l |
| 6 Dec 2024, 08:52 | <0.196 | below 0.196 mg/l (not detected above this) |
| 30 Oct 2024, 09:28 | 0.703 | 0.703 mg/l |
| 30 Sep 2024, 09:38 | 8.27 | 8.27 mg/l |
| 23 Aug 2024, 08:28 | 0.509 | 0.509 mg/l |
| 26 Jul 2024, 08:48 | 1.36 | 1.36 mg/l |
| 12 Jun 2024, 11:02 | 1.69 | 1.69 mg/l |
| 22 May 2024, 10:05 | 0.837 | 0.837 mg/l |
| 8 Apr 2024, 12:06 | 0.302 | 0.302 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.13 mg/l
Sampled 12 Jun 2026, 4 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 0.13 | 0.13 mg/l |
| 24 Mar 2026, 11:44 | 0.025 | 0.025 mg/l |
| 25 Feb 2026, 11:48 | 0.063 | 0.063 mg/l |
| 22 Jan 2026, 11:15 | 0.11 | 0.11 mg/l |
| 9 Dec 2025, 12:10 | 0.16 | 0.16 mg/l |
| 11 Nov 2025, 10:55 | 0.22 | 0.22 mg/l |
| 24 Oct 2025, 10:29 | 0.17 | 0.17 mg/l |
| 24 Sep 2025, 15:07 | 0.2 | 0.2 mg/l |
| 13 Aug 2025, 10:06 | 0.37 | 0.37 mg/l |
| 2 Jul 2025, 10:03 | 0.33 | 0.33 mg/l |
| 4 Jun 2025, 11:57 | 0.38 | 0.38 mg/l |
| 9 May 2025, 09:48 | 0.39 | 0.39 mg/l |
| 1 Apr 2025, 10:04 | 0.092 | 0.092 mg/l |
| 3 Mar 2025, 10:03 | 0.035 | 0.035 mg/l |
| 4 Feb 2025, 09:46 | 0.049 | 0.049 mg/l |
| 16 Jan 2025, 10:29 | 0.071 | 0.071 mg/l |
| 16 Dec 2024, 10:12 | 0.06 | 0.06 mg/l |
| 6 Dec 2024, 08:52 | <0.01 | below 0.01 mg/l (not detected above this) |
| 30 Oct 2024, 09:28 | 0.05 | 0.05 mg/l |
| 30 Sep 2024, 09:38 | 0.19 | 0.19 mg/l |
| 23 Aug 2024, 08:28 | 0.21 | 0.21 mg/l |
| 26 Jul 2024, 08:48 | 0.18 | 0.18 mg/l |
| 12 Jun 2024, 11:02 | 0.2 | 0.2 mg/l |
| 22 May 2024, 10:05 | 0.12 | 0.12 mg/l |
| 8 Apr 2024, 12:06 | 0.053 | 0.053 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
488 µS/cm
Sampled 12 Jun 2026, 4 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 14:10 | 488 | 488 µS/cm |
| 24 Mar 2026, 11:44 | 408 | 408 µS/cm |
| 25 Feb 2026, 11:48 | 323 | 323 µS/cm |
| 22 Jan 2026, 11:15 | 339 | 339 µS/cm |
| 9 Dec 2025, 12:10 | 234 | 234 µS/cm |
| 11 Nov 2025, 10:55 | 296 | 296 µS/cm |
| 24 Oct 2025, 10:29 | 329 | 329 µS/cm |
| 24 Sep 2025, 15:07 | 584 | 584 µS/cm |
| 13 Aug 2025, 10:06 | 1055 | 1055 µS/cm |
| 2 Jul 2025, 10:03 | 687 | 687 µS/cm |
| 4 Jun 2025, 11:57 | 678 | 678 µS/cm |
| 9 May 2025, 09:48 | 877 | 877 µS/cm |
| 1 Apr 2025, 10:04 | 569 | 569 µS/cm |
| 3 Mar 2025, 10:03 | 433 | 433 µS/cm |
| 4 Feb 2025, 09:46 | 398 | 398 µS/cm |
| 16 Jan 2025, 10:29 | 433 | 433 µS/cm |
| 16 Dec 2024, 10:12 | 437 | 437 µS/cm |
| 6 Dec 2024, 08:52 | 329 | 329 µS/cm |
| 26 Nov 2024, 09:30 | 235 | 235 µS/cm |
| 30 Oct 2024, 09:28 | 438 | 438 µS/cm |
| 30 Sep 2024, 09:38 | 320 | 320 µS/cm |
| 23 Aug 2024, 08:28 | 613 | 613 µS/cm |
| 26 Jul 2024, 08:48 | 592 | 592 µS/cm |
| 12 Jun 2024, 11:02 | 641 | 641 µS/cm |
| 22 May 2024, 10:05 | 481 | 481 µS/cm |
| 8 Apr 2024, 12:06 | 357 | 357 µS/cm |
Everything measured here
20 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 20 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 26 | Apr 2024 – Jun 2026 | 86% 12 Jun 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 25 | May 2024 – Jun 2026 | 8.78 mg/l 12 Jun 2026 |
| Temperature of Water 0076 | River water | 25 | May 2024 – Jun 2026 | 14.3 °C 12 Jun 2026 |
| pH 0061 | River water | 26 | Apr 2024 – Jun 2026 | 8.06 12 Jun 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | Apr 2024 – Jun 2026 | 0.073 mg/l 12 Jun 2026 |
| Nitrate as N 0117 | River water | 25 | Apr 2024 – Jun 2026 | 0.668 mg/l 12 Jun 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Apr 2024 – Jun 2026 | 0.13 mg/l 12 Jun 2026 |
| Conductivity at 25 C 0077 | River water | 26 | Apr 2024 – Jun 2026 | 488 µS/cm 12 Jun 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Sep 2024 – Jun 2026 | 160 mg/l 12 Jun 2026 |
| Ammonia un-ionised as N 0119 | River water | 24 | May 2024 – Jun 2026 | 0.00182 mg/l 12 Jun 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Apr 2024 – Jun 2026 | below 3 mg/l 12 Jun 2026 |
| Nitrite as N 0118 | River water | 25 | Apr 2024 – Jun 2026 | 0.032 mg/l 12 Jun 2026 |
| Nitrogen, Kjeldahl as N 0114 | River water | 24 | Apr 2024 – Jun 2026 | 0.7 mg/l 12 Jun 2026 |
| Nitrogen, Organic as N 0113 | River water | 24 | Apr 2024 – Jun 2026 | 0.627 mg/l 12 Jun 2026 |
| Nitrogen, Total as N 9686 | River water | 24 | Apr 2024 – Jun 2026 | 1.4 mg/l 12 Jun 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 25 | Apr 2024 – Jun 2026 | 0.7 mg/l 12 Jun 2026 |
| No flow /No sample 7668 | River water | 2 | Jul 2026 – Aug 2026 | No flow/discharge at sampling point 28 Aug 2026 |
| Phosphate :- {TIP} 0192 | River water | 25 | Apr 2024 – Jun 2026 | 0.13 mg/l 12 Jun 2026 |
| Phosphorus, Total as P 0348 | River water | 24 | Apr 2024 – Jun 2026 | 0.15 mg/l 12 Jun 2026 |
| Solids, Suspended at 105 C 0135 | River water | 24 | Apr 2024 – Jun 2026 | 16 mg/l 12 Jun 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.