River Carnon upstream of Grenna Bridge
EA name: RIVER CARNON U/S GRENNA BRIDGE (also listed as “RIVER CARNON IMMEDIATELY UPSTREAM GRENNA BRIDGE ALSO KNOWN AS DUNSTANS BRIDGE”)
Environment Agency sampling point SW-81950610 · 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
- 24 Jul 2026, 10:412 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 24 Apr 2024 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 178319, 40829As published, to the nearest 1 m. Open in a map
- River, by its own name
- Carnon
- River, by the map
- Carnon RiverPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Nearest gauge upstream
- Bissoe On the Carnon River · 1.0 km along the river
- Why it was sampled
- Monitoring (national agency policy) (27 samples)
Planned investigation (local monitoring) (1 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
91.8%
Sampled 24 Jul 2026, 2 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Jul 2026, 10:41 | 91.8 | 91.8% |
| 5 May 2026, 09:58 | 83 | 83% |
| 17 Apr 2026, 10:42 | 82 | 82% |
| 9 Mar 2026, 11:19 | 93.8 | 93.8% |
| 17 Feb 2026, 11:30 | 95.1 | 95.1% |
| 30 Jan 2026, 11:11 | 89.2 | 89.2% |
| 30 Dec 2025, 11:03 | 86.2 | 86.2% |
| 28 Nov 2025, 10:59 | 85.7 | 85.7% |
| 24 Oct 2025, 11:07 | 87.2 | 87.2% |
| 15 Sep 2025, 12:12 | 91.9 | 91.9% |
| 29 Aug 2025, 10:58 | 86.7 | 86.7% |
| 28 Jul 2025, 11:04 | 91.1 | 91.1% |
| 2 Jul 2025, 12:10 | 88.7 | 88.7% |
| 16 Jun 2025, 10:54 | 92.4 | 92.4% |
| 29 May 2025, 10:33 | 91 | 91% |
| 24 Apr 2025, 09:19 | 89 | 89% |
| 18 Mar 2025, 10:40 | 86.6 | 86.6% |
| 18 Feb 2025, 09:14 | 80.7 | 80.7% |
| 29 Jan 2025, 09:24 | 85.1 | 85.1% |
| 11 Dec 2024, 10:44 | 83.2 | 83.2% |
| 20 Nov 2024, 13:08 | 88.5 | 88.5% |
| 15 Oct 2024, 12:48 | 87.2 | 87.2% |
| 27 Sep 2024, 10:08 | 93.5 | 93.5% |
| 14 Aug 2024, 11:40 | 94 | 94% |
| 22 Jul 2024, 12:56 | 92.8 | 92.8% |
| 13 Jun 2024, 11:53 | 85.3 | 85.3% |
| 9 May 2024, 11:34 | 86 | 86% |
| 24 Apr 2024, 12:11 | 88.4 | 88.4% |
Water temperature
code 0076 · °C
15.6 °C
Sampled 24 Jul 2026, 2 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Jul 2026, 10:41 | 15.6 | 15.6 °C |
| 5 May 2026, 09:58 | 13.5 | 13.5 °C |
| 17 Apr 2026, 10:42 | 13.2 | 13.2 °C |
| 9 Mar 2026, 11:19 | 12.7 | 12.7 °C |
| 17 Feb 2026, 11:30 | 11.1 | 11.1 °C |
| 30 Jan 2026, 11:11 | 10.6 | 10.6 °C |
| 30 Dec 2025, 11:03 | 11.1 | 11.1 °C |
| 28 Nov 2025, 10:59 | 12 | 12 °C |
| 24 Oct 2025, 11:07 | 12 | 12 °C |
| 15 Sep 2025, 12:12 | 14.6 | 14.6 °C |
| 29 Aug 2025, 10:58 | 15.4 | 15.4 °C |
| 28 Jul 2025, 11:04 | 15.3 | 15.3 °C |
| 2 Jul 2025, 12:10 | 15 | 15 °C |
| 16 Jun 2025, 10:54 | 15.1 | 15.1 °C |
| 29 May 2025, 10:33 | 14.9 | 14.9 °C |
| 24 Apr 2025, 09:19 | 12.8 | 12.8 °C |
| 18 Mar 2025, 10:40 | 11.6 | 11.6 °C |
| 18 Feb 2025, 09:14 | 11.5 | 11.5 °C |
| 29 Jan 2025, 09:24 | 10.2 | 10.2 °C |
| 11 Dec 2024, 10:44 | 10.9 | 10.9 °C |
| 20 Nov 2024, 13:08 | 11.5 | 11.5 °C |
| 15 Oct 2024, 12:48 | 14.2 | 14.2 °C |
| 27 Sep 2024, 10:08 | 13.2 | 13.2 °C |
| 14 Aug 2024, 11:40 | 15.7 | 15.7 °C |
| 22 Jul 2024, 12:56 | 15.7 | 15.7 °C |
| 13 Jun 2024, 11:53 | 13.4 | 13.4 °C |
| 9 May 2024, 11:34 | 14.7 | 14.7 °C |
| 24 Apr 2024, 12:11 | 13.2 | 13.2 °C |
pH
code 0061
6.14
Sampled 24 Jul 2026, 2 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Jul 2026, 10:41 | 6.14 | 6.14 |
| 5 May 2026, 09:58 | 6.14 | 6.14 |
| 17 Apr 2026, 10:42 | 5.94 | 5.94 |
| 9 Mar 2026, 11:19 | 6.27 | 6.27 |
| 17 Feb 2026, 11:30 | 6.32 | 6.32 |
| 30 Jan 2026, 11:11 | 6.39 | 6.39 |
| 30 Dec 2025, 11:03 | 6.22 | 6.22 |
| 28 Nov 2025, 10:59 | 6.19 | 6.19 |
| 24 Oct 2025, 11:07 | 6.37 | 6.37 |
| 15 Sep 2025, 12:12 | 6.58 | 6.58 |
| 29 Aug 2025, 10:58 | 6.35 | 6.35 |
| 28 Jul 2025, 11:04 | 5.96 | 5.96 |
| 2 Jul 2025, 12:10 | 6.2 | 6.2 |
| 16 Jun 2025, 10:54 | 6.15 | 6.15 |
| 29 May 2025, 10:33 | 5.94 | 5.94 |
| 24 Apr 2025, 09:19 | 6.33 | 6.33 |
| 18 Mar 2025, 10:40 | 6.12 | 6.12 |
| 18 Feb 2025, 09:14 | 6.28 | 6.28 |
| 29 Jan 2025, 09:24 | 6.41 | 6.41 |
| 11 Dec 2024, 10:44 | 6.38 | 6.38 |
| 20 Nov 2024, 13:08 | 6.28 | 6.28 |
| 15 Oct 2024, 12:48 | 6.3 | 6.3 |
| 27 Sep 2024, 10:08 | 6.24 | 6.24 |
| 14 Aug 2024, 11:40 | 6.07 | 6.07 |
| 22 Jul 2024, 12:56 | 6.11 | 6.11 |
| 13 Jun 2024, 11:53 | 5.97 | 5.97 |
| 9 May 2024, 11:34 | 6.13 | 6.13 |
| 24 Apr 2024, 12:11 | 6.12 | 6.12 |
Conductivity
at 25 °C · code 0077 · µS/cm
654 µS/cm
Sampled 24 Jul 2026, 2 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Jul 2026, 10:41 | 654 | 654 µS/cm |
| 5 May 2026, 09:58 | 539 | 539 µS/cm |
| 17 Apr 2026, 10:42 | 519 | 519 µS/cm |
| 9 Mar 2026, 11:19 | 432 | 432 µS/cm |
| 17 Feb 2026, 11:30 | 426 | 426 µS/cm |
| 30 Jan 2026, 11:11 | 360 | 360 µS/cm |
| 30 Dec 2025, 11:03 | 488 | 488 µS/cm |
| 28 Nov 2025, 10:59 | 494 | 494 µS/cm |
| 24 Oct 2025, 11:07 | 600 | 600 µS/cm |
| 15 Sep 2025, 12:12 | 648 | 648 µS/cm |
| 29 Aug 2025, 10:58 | 632 | 632 µS/cm |
| 28 Jul 2025, 11:04 | 658 | 658 µS/cm |
| 2 Jul 2025, 12:10 | 589 | 589 µS/cm |
| 16 Jun 2025, 10:54 | 613 | 613 µS/cm |
| 29 May 2025, 10:33 | 580 | 580 µS/cm |
| 24 Apr 2025, 09:19 | 473 | 473 µS/cm |
| 18 Mar 2025, 10:40 | 508 | 508 µS/cm |
| 18 Feb 2025, 09:14 | 484 | 484 µS/cm |
| 29 Jan 2025, 09:24 | 453 | 453 µS/cm |
| 11 Dec 2024, 10:44 | 461 | 461 µS/cm |
| 20 Nov 2024, 13:08 | 584 | 584 µS/cm |
| 15 Oct 2024, 12:48 | 491 | 491 µS/cm |
| 27 Sep 2024, 10:08 | 608 | 608 µS/cm |
| 14 Aug 2024, 11:40 | 633 | 633 µS/cm |
| 22 Jul 2024, 12:56 | 516 | 516 µS/cm |
| 13 Jun 2024, 11:53 | 531 | 531 µS/cm |
| 9 May 2024, 11:34 | 499 | 499 µS/cm |
| 24 Apr 2024, 12:11 | 459 | 459 µS/cm |
Everything measured here
48 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 48 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Apr 2024 – Jul 2026 | 91.8% 24 Jul 2026 |
| Temperature of Water 0076 | River water | 28 | Apr 2024 – Jul 2026 | 15.6 °C 24 Jul 2026 |
| pH 0061 | River water | 28 | Apr 2024 – Jul 2026 | 6.14 24 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Apr 2024 – Jul 2026 | 654 µS/cm 24 Jul 2026 |
| Aluminium 6057 | River water | 27 | Apr 2024 – Jul 2026 | 500 µg/l 24 Jul 2026 |
| Aluminium, Dissolved 6037 | River water | 28 | Apr 2024 – Jul 2026 | 460 µg/l 24 Jul 2026 |
| Arsenic 6046 | River water | 27 | Apr 2024 – Jul 2026 | 110 µg/l 24 Jul 2026 |
| Arsenic, Dissolved 6045 | River water | 28 | Apr 2024 – Jul 2026 | 78 µg/l 24 Jul 2026 |
| Barium 6062 | River water | 27 | Apr 2024 – Jul 2026 | below 10 µg/l 24 Jul 2026 |
| Barium, Dissolved 9446 | River water | 27 | Apr 2024 – Jul 2026 | below 10 µg/l 24 Jul 2026 |
| Boron 6059 | River water | 27 | Apr 2024 – Jul 2026 | 120 µg/l 24 Jul 2026 |
| Boron, Dissolved 9447 | River water | 27 | Apr 2024 – Jul 2026 | 120 µg/l 24 Jul 2026 |
| Cadmium 0108 | River water | 27 | Apr 2024 – Jul 2026 | 1.7 µg/l 24 Jul 2026 |
| Cadmium, Dissolved 0106 | River water | 28 | Apr 2024 – Jul 2026 | 1.7 µg/l 24 Jul 2026 |
| Calcium 0241 | River water | 27 | Apr 2024 – Jul 2026 | 57 mg/l 24 Jul 2026 |
| Calcium, Dissolved 0239 | River water | 28 | Apr 2024 – Jul 2026 | 56 mg/l 24 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 28 | Apr 2024 – Jul 2026 | 0.9 mg/l 24 Jul 2026 |
| Chromium 3164 | River water | 27 | Apr 2024 – Jul 2026 | below 0.5 µg/l 24 Jul 2026 |
| Chromium, Dissolved 3409 | River water | 28 | Apr 2024 – Jul 2026 | below 0.5 µg/l 24 Jul 2026 |
| Copper 6452 | River water | 27 | Apr 2024 – Jul 2026 | 260 µg/l 24 Jul 2026 |
| Copper : BLM Bioavailable 4821 | River water | 1 | Jul 2025 – Jul 2025 | 180 µg/l 2 Jul 2025 |
| Copper, Dissolved 6450 | River water | 28 | Apr 2024 – Jul 2026 | 240 µg/l 24 Jul 2026 |
| Hardness, Total as CaCO3 0158 | River water | 27 | Apr 2024 – Jul 2026 | 175 mg/l 24 Jul 2026 |
| Iron 6051 | River water | 27 | Apr 2024 – Jul 2026 | 640 µg/l 24 Jul 2026 |
| Iron, Dissolved 6460 | River water | 27 | Apr 2024 – Jul 2026 | 150 µg/l 24 Jul 2026 |
| Lead : BLM Bioavailable 3377 | River water | 1 | Jul 2025 – Jul 2025 | 1 µg/l 2 Jul 2025 |
| Lead, Dissolved 0052 | River water | 28 | Apr 2024 – Jul 2026 | below 2 µg/l 24 Jul 2026 |
| Lithium 6064 | River water | 27 | Apr 2024 – Jul 2026 | 780 µg/l 24 Jul 2026 |
| Lithium, Dissolved 4201 | River water | 27 | Apr 2024 – Jul 2026 | 800 µg/l 24 Jul 2026 |
| Magnesium 0237 | River water | 27 | Apr 2024 – Jul 2026 | 8.6 mg/l 24 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 28 | Apr 2024 – Jul 2026 | 8.6 mg/l 24 Jul 2026 |
| Manganese 6050 | River water | 27 | Apr 2024 – Jul 2026 | 380 µg/l 24 Jul 2026 |
| Manganese : BLM Bioavailable 4820 | River water | 1 | Jul 2025 – Jul 2025 | 22 µg/l 2 Jul 2025 |
| Manganese, Dissolved 6458 | River water | 28 | Apr 2024 – Jul 2026 | 380 µg/l 24 Jul 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 1 | Jul 2025 – Jul 2025 | 7.1 µg/l 2 Jul 2025 |
| Nickel, Dissolved 3410 | River water | 28 | Apr 2024 – Jul 2026 | 45 µg/l 24 Jul 2026 |
| Potassium 0211 | River water | 27 | Apr 2024 – Jul 2026 | 5.1 mg/l 24 Jul 2026 |
| Potassium, Dissolved 0209 | River water | 27 | Apr 2024 – Jul 2026 | 5.1 mg/l 24 Jul 2026 |
| Sodium 0207 | River water | 27 | Apr 2024 – Jul 2026 | 47 mg/l 24 Jul 2026 |
| Sodium, Dissolved 0205 | River water | 27 | Apr 2024 – Jul 2026 | 48 mg/l 24 Jul 2026 |
| Solids, Suspended at 105 C 0135 | River water | 27 | Apr 2024 – Jul 2026 | 3.5 mg/l 24 Jul 2026 |
| Strontium 6063 | River water | 27 | Apr 2024 – Jul 2026 | 330 µg/l 24 Jul 2026 |
| Strontium, Filtered 6693 | River water | 27 | Apr 2024 – Jul 2026 | 330 µg/l 24 Jul 2026 |
| Sulphate as SO4 0183 | River water | 27 | Apr 2024 – Jul 2026 | 120 mg/l 24 Jul 2026 |
| Sulphate, Dissolved as SO4 7859 | River water | 27 | Apr 2024 – Jul 2026 | 120 mg/l 24 Jul 2026 |
| Zinc 6455 | River water | 27 | Apr 2024 – Jul 2026 | 1000 µg/l 24 Jul 2026 |
| Zinc : BLM Bioavailable 4822 | River water | 1 | Jul 2025 – Jul 2025 | 710 µg/l 2 Jul 2025 |
| Zinc, Dissolved 3408 | River water | 28 | Apr 2024 – Jul 2026 | 1000 µg/l 24 Jul 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.