River Yeo at Gunstone Mills
EA name: RIVER YEO AT GUNSTONE MILLS (also listed as “RIVER YEO (CREEDY) AT GUNSTONE MILLS”)
Environment Agency sampling point SW-70501029 · 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
- 3 Sep 2026, 10:1335 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 18 since 12 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 280586, 98496As published, to the nearest 1 m. Open in a map
- River, by its own name
- Yeo
- River, by the map
- River YeoPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Cowley Bridge On the River Creedy · 13 km along the river
- Nearest gauge upstream
- Yeoford On the River Yeo · 2.5 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (12 samples)
Monitoring (national agency policy) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
85.2%
Sampled 3 Sep 2026, 35 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 85.2 | 85.2% |
| 7 Aug 2026, 12:36 | 99.1 | 99.1% |
| 8 Jul 2026, 12:03 | 95.4 | 95.4% |
| 19 Jun 2026, 11:49 | 93.8 | 93.8% |
| 12 May 2026, 10:13 | 95.5 | 95.5% |
| 7 Apr 2026, 09:07 | 95.5 | 95.5% |
| 2 Mar 2026, 10:07 | 98.3 | 98.3% |
| 2 Feb 2026, 11:02 | 97.1 | 97.1% |
| 2 Jan 2026, 11:13 | 97 | 97% |
| 2 Dec 2025, 13:07 | 96.2 | 96.2% |
| 7 Nov 2025, 11:41 | 85.5 | 85.5% |
| 9 Oct 2025, 09:13 | 85.7 | 85.7% |
| 20 Mar 2024, 13:09 | 99.2 | 99.2% |
| 2 Feb 2024, 09:48 | 98.1 | 98.1% |
| 15 Jan 2024, 10:24 | 98 | 98% |
| 1 Dec 2023, 08:48 | 97.1 | 97.1% |
| 1 Nov 2023, 08:58 | 94.7 | 94.7% |
| 12 Oct 2023, 09:25 | 80.4 | 80.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.18 mg/l
Sampled 3 Sep 2026, 35 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 8.18 | 8.18 mg/l |
| 7 Aug 2026, 12:36 | 9.9 | 9.9 mg/l |
| 8 Jul 2026, 12:03 | 8.83 | 8.83 mg/l |
| 19 Jun 2026, 11:49 | 8.93 | 8.93 mg/l |
| 12 May 2026, 10:13 | 10.6 | 10.6 mg/l |
| 7 Apr 2026, 09:07 | 10.9 | 10.9 mg/l |
| 2 Mar 2026, 10:07 | 11.1 | 11.1 mg/l |
| 2 Feb 2026, 11:02 | 11.8 | 11.8 mg/l |
| 2 Jan 2026, 11:13 | 12.4 | 12.4 mg/l |
| 2 Dec 2025, 13:07 | 11.3 | 11.3 mg/l |
| 7 Nov 2025, 11:41 | 9.11 | 9.11 mg/l |
| 9 Oct 2025, 09:13 | 9.47 | 9.47 mg/l |
| 20 Mar 2024, 13:09 | 10.7 | 10.7 mg/l |
| 2 Feb 2024, 09:48 | 11.7 | 11.7 mg/l |
| 15 Jan 2024, 10:24 | 12.5 | 12.5 mg/l |
| 1 Dec 2023, 08:48 | 12.6 | 12.6 mg/l |
| 1 Nov 2023, 08:58 | 10.3 | 10.3 mg/l |
| 12 Oct 2023, 09:25 | 8.17 | 8.17 mg/l |
Water temperature
code 0076 · °C
17.2 °C
Sampled 3 Sep 2026, 35 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 17.2 | 17.2 °C |
| 7 Aug 2026, 12:36 | 15.3 | 15.3 °C |
| 8 Jul 2026, 12:03 | 19 | 19 °C |
| 19 Jun 2026, 11:49 | 17.6 | 17.6 °C |
| 12 May 2026, 10:13 | 10.7 | 10.7 °C |
| 7 Apr 2026, 09:07 | 9.5 | 9.5 °C |
| 2 Mar 2026, 10:07 | 9.9 | 9.9 °C |
| 2 Feb 2026, 11:02 | 6.9 | 6.9 °C |
| 2 Jan 2026, 11:13 | 5 | 5 °C |
| 2 Dec 2025, 13:07 | 8.4 | 8.4 °C |
| 7 Nov 2025, 11:41 | 12.4 | 12.4 °C |
| 9 Oct 2025, 09:13 | 10.8 | 10.8 °C |
| 20 Mar 2024, 13:09 | 12 | 12 °C |
| 2 Feb 2024, 09:48 | 7.6 | 7.6 °C |
| 15 Jan 2024, 10:24 | 5.1 | 5.1 °C |
| 1 Dec 2023, 08:48 | 4.4 | 4.4 °C |
| 1 Nov 2023, 08:58 | 11.7 | 11.7 °C |
| 12 Oct 2023, 09:25 | 14.5 | 14.5 °C |
pH
code 0061
7.78
Sampled 3 Sep 2026, 35 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 7.78 | 7.78 |
| 7 Aug 2026, 12:36 | 7.78 | 7.78 |
| 8 Jul 2026, 12:03 | 7.79 | 7.79 |
| 19 Jun 2026, 11:49 | 7.7 | 7.7 |
| 12 May 2026, 10:13 | 7.64 | 7.64 |
| 7 Apr 2026, 09:07 | 7.88 | 7.88 |
| 2 Mar 2026, 10:07 | 7.73 | 7.73 |
| 2 Feb 2026, 11:02 | 7.42 | 7.42 |
| 2 Jan 2026, 11:13 | 7.82 | 7.82 |
| 2 Dec 2025, 13:07 | 7.58 | 7.58 |
| 7 Nov 2025, 11:41 | 7.54 | 7.54 |
| 9 Oct 2025, 09:13 | 7.72 | 7.72 |
| 20 Mar 2024, 13:09 | 7.55 | 7.55 |
| 2 Feb 2024, 09:48 | 7.38 | 7.38 |
| 15 Jan 2024, 10:24 | 7.47 | 7.47 |
| 1 Dec 2023, 08:48 | 7.46 | 7.46 |
| 1 Nov 2023, 08:58 | 7.2 | 7.2 |
| 12 Oct 2023, 09:25 | 7.65 | 7.65 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.035 mg/l
Sampled 3 Sep 2026, 35 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 0.035 | 0.035 mg/l |
| 7 Aug 2026, 12:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jul 2026, 12:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Jun 2026, 11:49 | 0.09 | 0.09 mg/l |
| 12 May 2026, 10:13 | 0.69 | 0.69 mg/l |
| 7 Apr 2026, 09:07 | 0.05 | 0.05 mg/l |
| 2 Mar 2026, 10:07 | 0.06 | 0.06 mg/l |
| 2 Feb 2026, 11:02 | 0.053 | 0.053 mg/l |
| 2 Jan 2026, 11:13 | 0.031 | 0.031 mg/l |
| 2 Dec 2025, 13:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Nov 2025, 11:41 | 0.033 | 0.033 mg/l |
| 9 Oct 2025, 09:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Mar 2024, 13:09 | 0.087 | 0.087 mg/l |
| 2 Feb 2024, 09:48 | 0.054 | 0.054 mg/l |
| 15 Jan 2024, 10:24 | 0.056 | 0.056 mg/l |
| 1 Dec 2023, 08:48 | 0.046 | 0.046 mg/l |
| 1 Nov 2023, 08:58 | 0.051 | 0.051 mg/l |
| 12 Oct 2023, 09:25 | 0.044 | 0.044 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
9.37 mg/l
Sampled 3 Sep 2026, 35 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 9.37 | 9.37 mg/l |
| 7 Aug 2026, 12:36 | 11 | 11 mg/l |
| 8 Jul 2026, 12:03 | 9.97 | 9.97 mg/l |
| 19 Jun 2026, 11:49 | 9.22 | 9.22 mg/l |
| 12 May 2026, 10:13 | 6.97 | 6.97 mg/l |
| 7 Apr 2026, 09:07 | 5.37 | 5.37 mg/l |
| 2 Mar 2026, 10:07 | 3.38 | 3.38 mg/l |
| 2 Feb 2026, 11:02 | 3.39 | 3.39 mg/l |
| 2 Jan 2026, 11:13 | 4.79 | 4.79 mg/l |
| 2 Dec 2025, 13:07 | 3.09 | 3.09 mg/l |
| 7 Nov 2025, 11:41 | 3.37 | 3.37 mg/l |
| 9 Oct 2025, 09:13 | 8.74 | 8.74 mg/l |
| 20 Mar 2024, 13:09 | 4.08 | 4.08 mg/l |
| 2 Feb 2024, 09:48 | 4.98 | 4.98 mg/l |
| 15 Jan 2024, 10:24 | 5.58 | 5.58 mg/l |
| 1 Dec 2023, 08:48 | 4.37 | 4.37 mg/l |
| 1 Nov 2023, 08:58 | 3.88 | 3.88 mg/l |
| 12 Oct 2023, 09:25 | 8.24 | 8.24 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.37 mg/l
Sampled 3 Sep 2026, 35 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 0.37 | 0.37 mg/l |
| 8 Jul 2026, 12:03 | 0.33 | 0.33 mg/l |
| 19 Jun 2026, 11:49 | 0.32 | 0.32 mg/l |
| 12 May 2026, 10:13 | 0.26 | 0.26 mg/l |
| 7 Apr 2026, 09:07 | 0.1 | 0.1 mg/l |
| 2 Mar 2026, 10:07 | 0.064 | 0.064 mg/l |
| 2 Feb 2026, 11:02 | 0.06 | 0.06 mg/l |
| 2 Jan 2026, 11:13 | 0.078 | 0.078 mg/l |
| 2 Dec 2025, 13:07 | 0.037 | 0.037 mg/l |
| 7 Nov 2025, 11:41 | 0.13 | 0.13 mg/l |
| 9 Oct 2025, 09:13 | 0.34 | 0.34 mg/l |
| 20 Mar 2024, 13:09 | 0.068 | 0.068 mg/l |
| 2 Feb 2024, 09:48 | 0.078 | 0.078 mg/l |
| 15 Jan 2024, 10:24 | 0.087 | 0.087 mg/l |
| 1 Dec 2023, 08:48 | 0.074 | 0.074 mg/l |
| 1 Nov 2023, 08:58 | 0.049 | 0.049 mg/l |
| 12 Oct 2023, 09:25 | 0.27 | 0.27 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
478 µS/cm
Sampled 3 Sep 2026, 35 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 10:13 | 478 | 478 µS/cm |
| 7 Aug 2026, 12:36 | 481 | 481 µS/cm |
| 8 Jul 2026, 12:03 | 476 | 476 µS/cm |
| 19 Jun 2026, 11:49 | 454 | 454 µS/cm |
| 12 May 2026, 10:13 | 197 | 197 µS/cm |
| 7 Apr 2026, 09:07 | 331 | 331 µS/cm |
| 2 Mar 2026, 10:07 | 232 | 232 µS/cm |
| 2 Feb 2026, 11:02 | 213 | 213 µS/cm |
| 2 Jan 2026, 11:13 | 287 | 287 µS/cm |
| 2 Dec 2025, 13:07 | 217 | 217 µS/cm |
| 7 Nov 2025, 11:41 | 347 | 347 µS/cm |
| 9 Oct 2025, 09:13 | 455 | 455 µS/cm |
| 20 Mar 2024, 13:09 | 254 | 254 µS/cm |
| 2 Feb 2024, 09:48 | 286 | 286 µS/cm |
| 15 Jan 2024, 10:24 | 290 | 290 µS/cm |
| 1 Dec 2023, 08:48 | 281 | 281 µS/cm |
| 1 Nov 2023, 08:58 | 233 | 233 µS/cm |
| 12 Oct 2023, 09:25 | 425 | 425 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 | 18 | Oct 2023 – Sep 2026 | 85.2% 3 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 18 | Oct 2023 – Sep 2026 | 8.18 mg/l 3 Sep 2026 |
| Temperature of Water 0076 | River water | 18 | Oct 2023 – Sep 2026 | 17.2 °C 3 Sep 2026 |
| pH 0061 | River water | 18 | Oct 2023 – Sep 2026 | 7.78 3 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 18 | Oct 2023 – Sep 2026 | 0.035 mg/l 3 Sep 2026 |
| Nitrate as N 0117 | River water | 18 | Oct 2023 – Sep 2026 | 9.37 mg/l 3 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 17 | Oct 2023 – Sep 2026 | 0.37 mg/l 3 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 18 | Oct 2023 – Sep 2026 | 478 µS/cm 3 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 18 | Oct 2023 – Sep 2026 | 150 mg/l 3 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 18 | Oct 2023 – Sep 2026 | 0.00066 mg/l 3 Sep 2026 |
| Nitrite as N 0118 | River water | 18 | Oct 2023 – Sep 2026 | 0.028 mg/l 3 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 18 | Oct 2023 – Sep 2026 | 9.4 mg/l 3 Sep 2026 |
| Solids, Suspended at 105 C 0135 | River water | 12 | Oct 2025 – Sep 2026 | 4.9 mg/l 3 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.