River Allen at Knightsmill Bridge
EA name: RIVER ALLEN AT KNIGHTSMILL BRIDGE (also listed as “RIVER ALLEN (CAMEL) AT KNIGHTSMILL BRIDGE”)
Environment Agency sampling point SW-82540170 · 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
- 19 Mar 2025, 11:3219 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
- 17 since 19 Oct 2023 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 207130, 80630As published, to the nearest 10 m. Open in a map
- River, by its own name
- Allen
- River, by the map
- River AllenPlaced on the river its name gives, 18 m from the line.
- Next gauge downstream
- Penvose On the River Allen · 4.0 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (17 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.3%
Sampled 19 Mar 2025, 19 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | 98.3 | 98.3% |
| 13 Feb 2025, 10:47 | 99.7 | 99.7% |
| 7 Jan 2025, 12:10 | 98.4 | 98.4% |
| 3 Dec 2024, 09:24 | 97.7 | 97.7% |
| 1 Nov 2024, 14:37 | 97.1 | 97.1% |
| 4 Oct 2024, 13:44 | 99.4 | 99.4% |
| 3 Sep 2024, 09:49 | 91.1 | 91.1% |
| 30 Aug 2024, 10:39 | 91.4 | 91.4% |
| 13 Aug 2024, 12:02 | 97.8 | 97.8% |
| 10 Jul 2024, 10:52 | 96.4 | 96.4% |
| 5 Jun 2024, 10:57 | 97.2 | 97.2% |
| 5 Mar 2024, 10:36 | 98 | 98% |
| 1 Feb 2024, 10:02 | 98.2 | 98.2% |
| 17 Jan 2024, 09:48 | 98 | 98% |
| 4 Dec 2023, 10:56 | 100 | 100% |
| 6 Nov 2023, 10:06 | 96.9 | 96.9% |
| 19 Oct 2023, 15:20 | 96.3 | 96.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.3 mg/l
Sampled 19 Mar 2025, 19 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | 11.3 | 11.3 mg/l |
| 13 Feb 2025, 10:47 | 12.1 | 12.1 mg/l |
| 7 Jan 2025, 12:10 | 11.4 | 11.4 mg/l |
| 3 Dec 2024, 09:24 | 11.2 | 11.2 mg/l |
| 1 Nov 2024, 14:37 | 10.3 | 10.3 mg/l |
| 4 Oct 2024, 13:44 | 10.5 | 10.5 mg/l |
| 3 Sep 2024, 09:49 | 9.22 | 9.22 mg/l |
| 30 Aug 2024, 10:39 | 9.67 | 9.67 mg/l |
| 13 Aug 2024, 12:02 | 9.88 | 9.88 mg/l |
| 10 Jul 2024, 10:52 | 9.82 | 9.82 mg/l |
| 5 Jun 2024, 10:57 | 10.4 | 10.4 mg/l |
| 5 Mar 2024, 10:36 | 11.2 | 11.2 mg/l |
| 1 Feb 2024, 10:02 | 11.5 | 11.5 mg/l |
| 17 Jan 2024, 09:48 | 11.8 | 11.8 mg/l |
| 4 Dec 2023, 10:56 | 11.4 | 11.4 mg/l |
| 6 Nov 2023, 10:06 | 10.5 | 10.5 mg/l |
| 19 Oct 2023, 15:20 | 9.92 | 9.92 mg/l |
Water temperature
code 0076 · °C
9.2 °C
Sampled 19 Mar 2025, 19 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | 9.2 | 9.2 °C |
| 13 Feb 2025, 10:47 | 7.1 | 7.1 °C |
| 7 Jan 2025, 12:10 | 8.9 | 8.9 °C |
| 3 Dec 2024, 09:24 | 9.1 | 9.1 °C |
| 1 Nov 2024, 14:37 | 12.5 | 12.5 °C |
| 4 Oct 2024, 13:44 | 12.9 | 12.9 °C |
| 3 Sep 2024, 09:49 | 14.7 | 14.7 °C |
| 30 Aug 2024, 10:39 | 12.7 | 12.7 °C |
| 13 Aug 2024, 12:02 | 14.8 | 14.8 °C |
| 10 Jul 2024, 10:52 | 14.4 | 14.4 °C |
| 5 Jun 2024, 10:57 | 12.1 | 12.1 °C |
| 5 Mar 2024, 10:36 | 9.4 | 9.4 °C |
| 1 Feb 2024, 10:02 | 8.5 | 8.5 °C |
| 17 Jan 2024, 09:48 | 7.1 | 7.1 °C |
| 4 Dec 2023, 10:56 | 9.4 | 9.4 °C |
| 6 Nov 2023, 10:06 | 11.8 | 11.8 °C |
| 19 Oct 2023, 15:20 | 13.9 | 13.9 °C |
pH
code 0061
7.68
Sampled 19 Mar 2025, 19 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | 7.68 | 7.68 |
| 13 Feb 2025, 10:47 | 7.53 | 7.53 |
| 7 Jan 2025, 12:10 | 7.54 | 7.54 |
| 3 Dec 2024, 09:24 | 7.63 | 7.63 |
| 1 Nov 2024, 14:37 | 7.61 | 7.61 |
| 4 Oct 2024, 13:44 | 7.44 | 7.44 |
| 3 Sep 2024, 09:49 | 7.56 | 7.56 |
| 30 Aug 2024, 10:39 | 7.54 | 7.54 |
| 13 Aug 2024, 12:02 | 7.88 | 7.88 |
| 10 Jul 2024, 10:52 | 7.51 | 7.51 |
| 5 Jun 2024, 10:57 | 7.82 | 7.82 |
| 5 Mar 2024, 10:36 | 7.47 | 7.47 |
| 1 Feb 2024, 10:02 | 7.65 | 7.65 |
| 17 Jan 2024, 09:48 | 7.52 | 7.52 |
| 4 Dec 2023, 10:56 | 7.51 | 7.51 |
| 6 Nov 2023, 10:06 | 7.39 | 7.39 |
| 19 Oct 2023, 15:20 | 7.32 | 7.32 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 19 Mar 2025, 19 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2025, 10:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2025, 12:10 | 0.048 | 0.048 mg/l |
| 3 Dec 2024, 09:24 | 0.036 | 0.036 mg/l |
| 1 Nov 2024, 14:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Oct 2024, 13:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Sep 2024, 09:49 | 0.041 | 0.041 mg/l |
| 30 Aug 2024, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2024, 12:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jul 2024, 10:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jun 2024, 10:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2024, 10:36 | 0.043 | 0.043 mg/l |
| 1 Feb 2024, 10:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jan 2024, 09:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2023, 10:56 | 0.25 | 0.25 mg/l |
| 6 Nov 2023, 10:06 | 0.062 | 0.062 mg/l |
| 19 Oct 2023, 15:20 | 0.082 | 0.082 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.69 mg/l
Sampled 19 Mar 2025, 19 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | 4.69 | 4.69 mg/l |
| 13 Feb 2025, 10:47 | 4.59 | 4.59 mg/l |
| 7 Jan 2025, 12:10 | 3.3 | 3.3 mg/l |
| 1 Nov 2024, 14:37 | 4.09 | 4.09 mg/l |
| 4 Oct 2024, 13:44 | 3.59 | 3.59 mg/l |
| 3 Sep 2024, 09:49 | 3.78 | 3.78 mg/l |
| 30 Aug 2024, 10:39 | 4.68 | 4.68 mg/l |
| 13 Aug 2024, 12:02 | 4.69 | 4.69 mg/l |
| 10 Jul 2024, 10:52 | 4.39 | 4.39 mg/l |
| 5 Jun 2024, 10:57 | 4.49 | 4.49 mg/l |
| 5 Mar 2024, 10:36 | 3.79 | 3.79 mg/l |
| 1 Feb 2024, 10:02 | 4.5 | 4.5 mg/l |
| 17 Jan 2024, 09:48 | 4.99 | 4.99 mg/l |
| 4 Dec 2023, 10:56 | 2.99 | 2.99 mg/l |
| 6 Nov 2023, 10:06 | 3.49 | 3.49 mg/l |
| 19 Oct 2023, 15:20 | 3.69 | 3.69 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.02 mg/l
Sampled 19 Mar 2025, 19 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | 0.02 | 0.02 mg/l |
| 13 Feb 2025, 10:47 | 0.018 | 0.018 mg/l |
| 7 Jan 2025, 12:10 | 0.034 | 0.034 mg/l |
| 3 Dec 2024, 09:24 | 0.027 | 0.027 mg/l |
| 1 Nov 2024, 14:37 | 0.026 | 0.026 mg/l |
| 4 Oct 2024, 13:44 | 0.027 | 0.027 mg/l |
| 3 Sep 2024, 09:49 | 0.078 | 0.078 mg/l |
| 30 Aug 2024, 10:39 | 0.065 | 0.065 mg/l |
| 13 Aug 2024, 12:02 | 0.044 | 0.044 mg/l |
| 10 Jul 2024, 10:52 | 0.03 | 0.03 mg/l |
| 5 Jun 2024, 10:57 | 0.03 | 0.03 mg/l |
| 5 Mar 2024, 10:36 | 0.029 | 0.029 mg/l |
| 1 Feb 2024, 10:02 | 0.02 | 0.02 mg/l |
| 17 Jan 2024, 09:48 | 0.019 | 0.019 mg/l |
| 4 Dec 2023, 10:56 | 0.074 | 0.074 mg/l |
| 6 Nov 2023, 10:06 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Oct 2023, 15:20 | 0.042 | 0.042 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
268 µS/cm
Sampled 19 Mar 2025, 19 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Mar 2025, 11:32 | 268 | 268 µS/cm |
| 13 Feb 2025, 10:47 | 254 | 254 µS/cm |
| 7 Jan 2025, 12:10 | 216 | 216 µS/cm |
| 3 Dec 2024, 09:24 | 214 | 214 µS/cm |
| 1 Nov 2024, 14:37 | 243 | 243 µS/cm |
| 4 Oct 2024, 13:44 | 229 | 229 µS/cm |
| 3 Sep 2024, 09:49 | 288 | 288 µS/cm |
| 30 Aug 2024, 10:39 | 290 | 290 µS/cm |
| 13 Aug 2024, 12:02 | 276 | 276 µS/cm |
| 10 Jul 2024, 10:52 | 284 | 284 µS/cm |
| 5 Jun 2024, 10:57 | 283 | 283 µS/cm |
| 5 Mar 2024, 10:36 | 228 | 228 µS/cm |
| 1 Feb 2024, 10:02 | 260 | 260 µS/cm |
| 17 Jan 2024, 09:48 | 262 | 262 µS/cm |
| 4 Dec 2023, 10:56 | 200 | 200 µS/cm |
| 6 Nov 2023, 10:06 | 216 | 216 µS/cm |
| 19 Oct 2023, 15:20 | 242 | 242 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 17 | Oct 2023 – Mar 2025 | 98.3% 19 Mar 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 17 | Oct 2023 – Mar 2025 | 11.3 mg/l 19 Mar 2025 |
| Temperature of Water 0076 | River water | 17 | Oct 2023 – Mar 2025 | 9.2 °C 19 Mar 2025 |
| pH 0061 | River water | 17 | Oct 2023 – Mar 2025 | 7.68 19 Mar 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 17 | Oct 2023 – Mar 2025 | below 0.03 mg/l 19 Mar 2025 |
| Nitrate as N 0117 | River water | 16 | Oct 2023 – Mar 2025 | 4.69 mg/l 19 Mar 2025 |
| Orthophosphate, reactive as P 0180 | River water | 17 | Oct 2023 – Mar 2025 | 0.02 mg/l 19 Mar 2025 |
| Conductivity at 25 C 0077 | River water | 17 | Oct 2023 – Mar 2025 | 268 µS/cm 19 Mar 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 17 | Oct 2023 – Mar 2025 | 50 mg/l 19 Mar 2025 |
| Ammonia un-ionised as N 0119 | River water | 17 | Oct 2023 – Mar 2025 | below 0.00025 mg/l 19 Mar 2025 |
| Nitrite as N 0118 | River water | 17 | Oct 2023 – Mar 2025 | 0.0052 mg/l 19 Mar 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 16 | Oct 2023 – Mar 2025 | 4.7 mg/l 19 Mar 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.