Gaunless at the Slack
EA name: GAUNLESS AT THE SLACK
Environment Agency sampling point NE-44200143 · 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
- 5 Aug 2026, 10:4457 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 21 since 3 Oct 2023 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 411446, 525426As published, to the nearest 1 m. Open in a map
- River, by its own name
- Gaunless
- River, by the map
- River GaunlessPlaced on the river its name gives, 0 m from the line.
- Next gauge downstream
- Lowlands On the River Gaunless · 2.5 km along the river
- Nearest gauge upstream
- Copley On the River Gaunless · 4.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (21 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
96.6%
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | 96.6 | 96.6% |
| 9 Jul 2026, 11:50 | 121.2 | 121.2% |
| 3 Jun 2026, 11:45 | 94.6 | 94.6% |
| 1 May 2026, 10:52 | 101.4 | 101.4% |
| 1 Apr 2026, 10:39 | 105.3 | 105.3% |
| 4 Mar 2026, 10:09 | 100.9 | 100.9% |
| 2 Feb 2026, 12:05 | 99.4 | 99.4% |
| 5 Jan 2026, 11:25 | 94.5 | 94.5% |
| 2 Dec 2025, 10:19 | 100.7 | 100.7% |
| 4 Nov 2025, 10:30 | 93.8 | 93.8% |
| 2 Oct 2025, 11:02 | 104.2 | 104.2% |
| 2 Sep 2025, 10:27 | 101.7 | 101.7% |
| 1 Aug 2025, 12:26 | 112.5 | 112.5% |
| 7 Apr 2025, 11:56 | 107.7 | 107.7% |
| 5 Mar 2025, 13:38 | 104.5 | 104.5% |
| 4 Mar 2024, 09:41 | 98.9 | 98.9% |
| 8 Feb 2024, 10:00 | 96.7 | 96.7% |
| 2 Jan 2024, 13:29 | 100.1 | 100.1% |
| 6 Dec 2023, 11:03 | 98.7 | 98.7% |
| 13 Nov 2023, 10:56 | 100.2 | 100.2% |
| 3 Oct 2023, 13:18 | 100.1 | 100.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.55 mg/l
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | 9.55 | 9.55 mg/l |
| 9 Jul 2026, 11:50 | 11.8 | 11.8 mg/l |
| 3 Jun 2026, 11:45 | 9.99 | 9.99 mg/l |
| 1 May 2026, 10:52 | 11.3 | 11.3 mg/l |
| 1 Apr 2026, 10:39 | 12.2 | 12.2 mg/l |
| 4 Mar 2026, 10:09 | 12.4 | 12.4 mg/l |
| 2 Feb 2026, 12:05 | 12.1 | 12.1 mg/l |
| 5 Jan 2026, 11:25 | 13.4 | 13.4 mg/l |
| 2 Dec 2025, 10:19 | 12.4 | 12.4 mg/l |
| 4 Nov 2025, 10:30 | 10.3 | 10.3 mg/l |
| 2 Oct 2025, 11:02 | 11.1 | 11.1 mg/l |
| 2 Sep 2025, 10:27 | 10.6 | 10.6 mg/l |
| 1 Aug 2025, 12:26 | 11.4 | 11.4 mg/l |
| 7 Apr 2025, 11:56 | 12.9 | 12.9 mg/l |
| 5 Mar 2025, 13:38 | 12.4 | 12.4 mg/l |
| 4 Mar 2024, 09:41 | 13.2 | 13.2 mg/l |
| 8 Feb 2024, 10:00 | 12.3 | 12.3 mg/l |
| 2 Jan 2024, 13:29 | 12.4 | 12.4 mg/l |
| 6 Dec 2023, 11:03 | 13.1 | 13.1 mg/l |
| 13 Nov 2023, 10:56 | 11.8 | 11.8 mg/l |
| 3 Oct 2023, 13:18 | 10.9 | 10.9 mg/l |
Water temperature
code 0076 · °C
15.8 °C
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | 15.8 | 15.8 °C |
| 9 Jul 2026, 11:50 | 16.7 | 16.7 °C |
| 3 Jun 2026, 11:45 | 12.8 | 12.8 °C |
| 1 May 2026, 10:52 | 10.3 | 10.3 °C |
| 1 Apr 2026, 10:39 | 9 | 9 °C |
| 4 Mar 2026, 10:09 | 6.4 | 6.4 °C |
| 2 Feb 2026, 12:05 | 6.7 | 6.7 °C |
| 5 Jan 2026, 11:25 | 1.1 | 1.1 °C |
| 2 Dec 2025, 10:19 | 6.5 | 6.5 °C |
| 4 Nov 2025, 10:30 | 11.2 | 11.2 °C |
| 2 Oct 2025, 11:02 | 12.4 | 12.4 °C |
| 2 Sep 2025, 10:27 | 13.4 | 13.4 °C |
| 1 Aug 2025, 12:26 | 14.6 | 14.6 °C |
| 7 Apr 2025, 11:56 | 7.5 | 7.5 °C |
| 5 Mar 2025, 13:38 | 7.9 | 7.9 °C |
| 4 Mar 2024, 09:41 | 3.3 | 3.3 °C |
| 8 Feb 2024, 10:00 | 5 | 5 °C |
| 2 Jan 2024, 13:29 | 6.2 | 6.2 °C |
| 6 Dec 2023, 11:03 | 3.6 | 3.6 °C |
| 13 Nov 2023, 10:56 | 8.1 | 8.1 °C |
| 3 Oct 2023, 13:18 | 11.3 | 11.3 °C |
pH
code 0061
8.62
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | 8.62 | 8.62 |
| 9 Jul 2026, 11:50 | 8.31 | 8.31 |
| 3 Jun 2026, 11:45 | 8.33 | 8.33 |
| 1 May 2026, 10:52 | 8.26 | 8.26 |
| 1 Apr 2026, 10:39 | 7.9 | 7.9 |
| 4 Mar 2026, 10:09 | 7.87 | 7.87 |
| 2 Feb 2026, 12:05 | 7.75 | 7.75 |
| 5 Jan 2026, 11:25 | 7.98 | 7.98 |
| 2 Dec 2025, 10:19 | 7.69 | 7.69 |
| 4 Nov 2025, 10:30 | 8.06 | 8.06 |
| 2 Oct 2025, 11:02 | 8.23 | 8.23 |
| 2 Sep 2025, 10:27 | 8.29 | 8.29 |
| 1 Aug 2025, 12:26 | 8.63 | 8.63 |
| 7 Apr 2025, 11:56 | 8.35 | 8.35 |
| 5 Mar 2025, 13:38 | 8.12 | 8.12 |
| 4 Mar 2024, 09:41 | 7.04 | 7.04 |
| 8 Feb 2024, 10:00 | 7.57 | 7.57 |
| 2 Jan 2024, 13:29 | 6.92 | 6.92 |
| 6 Dec 2023, 11:03 | 7.01 | 7.01 |
| 13 Nov 2023, 10:56 | 8.05 | 8.05 |
| 3 Oct 2023, 13:18 | 7.87 | 7.87 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2026, 11:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2026, 11:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 May 2026, 10:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Apr 2026, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2026, 10:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 12:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jan 2026, 11:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Dec 2025, 10:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Nov 2025, 10:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2025, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Sep 2025, 10:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2025, 12:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Apr 2025, 11:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2025, 13:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2024, 09:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Feb 2024, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jan 2024, 13:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Dec 2023, 11:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Nov 2023, 10:56 | 0.067 | 0.067 mg/l |
| 3 Oct 2023, 13:18 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.406 mg/l
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | 0.406 | 0.406 mg/l |
| 9 Jul 2026, 11:50 | 0.466 | 0.466 mg/l |
| 3 Jun 2026, 11:45 | 0.446 | 0.446 mg/l |
| 1 May 2026, 10:52 | 0.516 | 0.516 mg/l |
| 1 Apr 2026, 10:39 | 0.826 | 0.826 mg/l |
| 4 Mar 2026, 10:09 | 1.3 | 1.3 mg/l |
| 2 Feb 2026, 12:05 | 1.8 | 1.8 mg/l |
| 5 Jan 2026, 11:25 | 1.2 | 1.2 mg/l |
| 2 Dec 2025, 10:19 | 1.8 | 1.8 mg/l |
| 4 Nov 2025, 10:30 | 0.306 | 0.306 mg/l |
| 2 Oct 2025, 11:02 | 0.416 | 0.416 mg/l |
| 2 Sep 2025, 10:27 | 0.336 | 0.336 mg/l |
| 1 Aug 2025, 12:26 | 0.266 | 0.266 mg/l |
| 7 Apr 2025, 11:56 | 0.506 | 0.506 mg/l |
| 5 Mar 2025, 13:38 | 0.826 | 0.826 mg/l |
| 4 Mar 2024, 09:41 | 1.1 | 1.1 mg/l |
| 8 Feb 2024, 10:00 | 1.3 | 1.3 mg/l |
| 2 Jan 2024, 13:29 | 0.996 | 0.996 mg/l |
| 6 Dec 2023, 11:03 | 1.5 | 1.5 mg/l |
| 13 Nov 2023, 10:56 | 0.796 | 0.796 mg/l |
| 3 Oct 2023, 13:18 | 0.326 | 0.326 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.01 mg/l (not detected above this)
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Jul 2026, 11:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Jun 2026, 11:45 | <0.01 | below 0.01 mg/l (not detected above this) |
| 1 May 2026, 10:52 | <0.01 | below 0.01 mg/l (not detected above this) |
| 1 Apr 2026, 10:39 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Mar 2026, 10:09 | 0.01 | 0.01 mg/l |
| 2 Feb 2026, 12:05 | 0.018 | 0.018 mg/l |
| 5 Jan 2026, 11:25 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Dec 2025, 10:19 | 0.029 | 0.029 mg/l |
| 4 Nov 2025, 10:30 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Oct 2025, 11:02 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Sep 2025, 10:27 | <0.01 | below 0.01 mg/l (not detected above this) |
| 1 Aug 2025, 12:26 | 0.012 | 0.012 mg/l |
| 7 Apr 2025, 11:56 | <0.01 | below 0.01 mg/l (not detected above this) |
| 5 Mar 2025, 13:38 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Mar 2024, 09:41 | 0.01 | 0.01 mg/l |
| 8 Feb 2024, 10:00 | 0.01 | 0.01 mg/l |
| 2 Jan 2024, 13:29 | 0.017 | 0.017 mg/l |
| 6 Dec 2023, 11:03 | 0.011 | 0.011 mg/l |
| 13 Nov 2023, 10:56 | 0.048 | 0.048 mg/l |
| 3 Oct 2023, 13:18 | 0.011 | 0.011 mg/l |
Turbidity
code 6396 · NTU
1.5 NTU
Sampled 5 Aug 2026, 57 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | 1.5 | 1.5 NTU |
| 9 Jul 2026, 11:50 | 2.6 | 2.6 NTU |
| 3 Jun 2026, 11:45 | 2.8 | 2.8 NTU |
| 1 May 2026, 10:52 | 1.5 | 1.5 NTU |
| 1 Apr 2026, 10:39 | 4.3 | 4.3 NTU |
| 4 Mar 2026, 10:09 | 2.9 | 2.9 NTU |
| 2 Feb 2026, 12:05 | 3 | 3 NTU |
| 5 Jan 2026, 11:25 | 2.2 | 2.2 NTU |
| 2 Dec 2025, 10:19 | 4.6 | 4.6 NTU |
| 4 Nov 2025, 10:30 | 2.2 | 2.2 NTU |
| 2 Oct 2025, 11:02 | 1.6 | 1.6 NTU |
| 1 Aug 2025, 12:26 | 2.8 | 2.8 NTU |
| 7 Apr 2025, 11:56 | 2 | 2 NTU |
| 5 Mar 2025, 13:38 | 3 | 3 NTU |
| 4 Mar 2024, 09:41 | 4.5 | 4.5 NTU |
| 8 Feb 2024, 10:00 | 1.8 | 1.8 NTU |
| 2 Jan 2024, 13:29 | 7.8 | 7.8 NTU |
| 6 Dec 2023, 11:03 | 3.7 | 3.7 NTU |
| 13 Nov 2023, 10:56 | 84 | 84 NTU |
| 3 Oct 2023, 13:18 | 5.8 | 5.8 NTU |
Conductivity
at 25 °C · code 0077 · µS/cm
518 µS/cm
Sampled 5 Aug 2026, 57 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:44 | 518 | 518 µS/cm |
| 9 Jul 2026, 11:50 | 533 | 533 µS/cm |
| 3 Jun 2026, 11:45 | 461 | 461 µS/cm |
| 1 May 2026, 10:52 | 504 | 504 µS/cm |
| 1 Apr 2026, 10:39 | 431 | 431 µS/cm |
| 4 Mar 2026, 10:09 | 438 | 438 µS/cm |
| 2 Feb 2026, 12:05 | 344 | 344 µS/cm |
| 5 Jan 2026, 11:25 | 444 | 444 µS/cm |
| 2 Dec 2025, 10:19 | 289 | 289 µS/cm |
| 4 Nov 2025, 10:30 | 387 | 387 µS/cm |
| 2 Oct 2025, 11:02 | 455 | 455 µS/cm |
| 2 Sep 2025, 10:27 | 546 | 546 µS/cm |
| 1 Aug 2025, 12:26 | 542 | 542 µS/cm |
| 7 Apr 2025, 11:56 | 485 | 485 µS/cm |
| 5 Mar 2025, 13:38 | 413 | 413 µS/cm |
| 4 Mar 2024, 09:41 | 241 | 241 µS/cm |
| 8 Feb 2024, 10:00 | 421 | 421 µS/cm |
| 2 Jan 2024, 13:29 | 168 | 168 µS/cm |
| 6 Dec 2023, 11:03 | 225 | 225 µS/cm |
| 13 Nov 2023, 10:56 | 165 | 165 µS/cm |
| 3 Oct 2023, 13:18 | 204 | 204 µS/cm |
Everything measured here
15 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 15 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 21 | Oct 2023 – Aug 2026 | 96.6% 5 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 21 | Oct 2023 – Aug 2026 | 9.55 mg/l 5 Aug 2026 |
| Temperature of Water 0076 | River water | 21 | Oct 2023 – Aug 2026 | 15.8 °C 5 Aug 2026 |
| pH 0061 | River water | 21 | Oct 2023 – Aug 2026 | 8.62 5 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 21 | Oct 2023 – Aug 2026 | below 0.03 mg/l 5 Aug 2026 |
| Nitrate as N 0117 | River water | 21 | Oct 2023 – Aug 2026 | 0.406 mg/l 5 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Oct 2023 – Aug 2026 | below 0.01 mg/l 5 Aug 2026 |
| Turbidity 6396 | River water | 20 | Oct 2023 – Aug 2026 | 1.5 NTU 5 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 21 | Oct 2023 – Aug 2026 | 518 µS/cm 5 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 21 | Oct 2023 – Aug 2026 | 180 mg/l 5 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 21 | Oct 2023 – Aug 2026 | below 0.00084 mg/l 5 Aug 2026 |
| Chlorophyll : Acetone Extract 7887 | River water | 19 | Oct 2023 – Aug 2026 | 76 µg/l 5 Aug 2026 |
| Nitrite as N 0118 | River water | 21 | Oct 2023 – Aug 2026 | below 0.004 mg/l 5 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Oct 2023 – Aug 2026 | 0.41 mg/l 5 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 21 | Oct 2023 – Aug 2026 | 5.1 mg/l 5 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.