River Hayle at B3303 Bridge Crowan
EA name: RIVER HAYLE AT B3303 BRIDGE CROWAN
Environment Agency sampling point SW-82221891 · 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
- 1 Apr 2026, 15:386 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 30 Sep 2026 and had nothing newer.
- Samples banked
- 25 since 19 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 163912, 34629As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hayle
- River, by the map
- An unnamed streamOn a small stream traced into the river its name gives, 3 m from the line.
- Next gauge downstream
- Relubbus On the River Hayle · 9.1 km along the river (the path rests on a repair to the map)
- Why it was sampled
- Monitoring (national agency policy) (25 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
100%
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | 100 | 100% |
| 6 Mar 2026, 09:36 | 97 | 97% |
| 3 Feb 2026, 12:08 | 98.4 | 98.4% |
| 2 Jan 2026, 12:04 | 94 | 94% |
| 2 Dec 2025, 13:53 | 98.1 | 98.1% |
| 3 Nov 2025, 11:45 | 98.1 | 98.1% |
| 7 Oct 2025, 12:17 | 96 | 96% |
| 19 Sep 2025, 12:42 | 101 | 101% |
| 28 Aug 2025, 12:31 | 99.5 | 99.5% |
| 30 Jul 2025, 12:20 | 99.2 | 99.2% |
| 30 Jun 2025, 15:20 | 98.6 | 98.6% |
| 23 May 2025, 13:41 | 100.3 | 100.3% |
| 23 Apr 2025, 11:53 | 103.7 | 103.7% |
| 3 Mar 2025, 12:55 | 98.1 | 98.1% |
| 7 Feb 2025, 10:08 | 100.2 | 100.2% |
| 23 Jan 2025, 10:45 | 98.3 | 98.3% |
| 2 Dec 2024, 13:16 | 99.8 | 99.8% |
| 18 Nov 2024, 11:29 | 99.5 | 99.5% |
| 17 Oct 2024, 10:22 | 99.1 | 99.1% |
| 16 Sep 2024, 12:54 | 100 | 100% |
| 22 Aug 2024, 11:46 | 100.3 | 100.3% |
| 16 Jul 2024, 14:02 | 101 | 101% |
| 24 Jun 2024, 12:06 | 101.5 | 101.5% |
| 13 May 2024, 12:09 | 100.7 | 100.7% |
| 19 Apr 2024, 09:48 | 100.2 | 100.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.9 mg/l
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | 10.9 | 10.9 mg/l |
| 6 Mar 2026, 09:36 | 11.2 | 11.2 mg/l |
| 3 Feb 2026, 12:08 | 11.1 | 11.1 mg/l |
| 2 Jan 2026, 12:04 | 10.6 | 10.6 mg/l |
| 2 Dec 2025, 13:53 | 11 | 11 mg/l |
| 3 Nov 2025, 11:45 | 10.4 | 10.4 mg/l |
| 7 Oct 2025, 12:17 | 10.1 | 10.1 mg/l |
| 19 Sep 2025, 12:42 | 10.1 | 10.1 mg/l |
| 28 Aug 2025, 12:31 | 10 | 10 mg/l |
| 30 Jul 2025, 12:20 | 9.68 | 9.68 mg/l |
| 30 Jun 2025, 15:20 | 9.47 | 9.47 mg/l |
| 23 May 2025, 13:41 | 10.2 | 10.2 mg/l |
| 23 Apr 2025, 11:53 | 11.2 | 11.2 mg/l |
| 3 Mar 2025, 12:55 | 11.3 | 11.3 mg/l |
| 7 Feb 2025, 10:08 | 12.3 | 12.3 mg/l |
| 23 Jan 2025, 10:45 | 11.5 | 11.5 mg/l |
| 2 Dec 2024, 13:16 | 11.1 | 11.1 mg/l |
| 18 Nov 2024, 11:29 | 10.9 | 10.9 mg/l |
| 17 Oct 2024, 10:22 | 10.4 | 10.4 mg/l |
| 16 Sep 2024, 12:54 | 10.3 | 10.3 mg/l |
| 22 Aug 2024, 11:46 | 10 | 10 mg/l |
| 16 Jul 2024, 14:02 | 10.1 | 10.1 mg/l |
| 24 Jun 2024, 12:06 | 10.3 | 10.3 mg/l |
| 13 May 2024, 12:09 | 10.6 | 10.6 mg/l |
| 19 Apr 2024, 09:48 | 11.2 | 11.2 mg/l |
Water temperature
code 0076 · °C
11.6 °C
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | 11.6 | 11.6 °C |
| 6 Mar 2026, 09:36 | 8.9 | 8.9 °C |
| 3 Feb 2026, 12:08 | 9.9 | 9.9 °C |
| 2 Jan 2026, 12:04 | 10.1 | 10.1 °C |
| 2 Dec 2025, 13:53 | 10.2 | 10.2 °C |
| 3 Nov 2025, 11:45 | 12.7 | 12.7 °C |
| 7 Oct 2025, 12:17 | 13 | 13 °C |
| 19 Sep 2025, 12:42 | 15.2 | 15.2 °C |
| 28 Aug 2025, 12:31 | 15 | 15 °C |
| 30 Jul 2025, 12:20 | 16.4 | 16.4 °C |
| 30 Jun 2025, 15:20 | 17.2 | 17.2 °C |
| 23 May 2025, 13:41 | 14.4 | 14.4 °C |
| 23 Apr 2025, 11:53 | 11.9 | 11.9 °C |
| 3 Mar 2025, 12:55 | 9.1 | 9.1 °C |
| 7 Feb 2025, 10:08 | 6.4 | 6.4 °C |
| 23 Jan 2025, 10:45 | 8.6 | 8.6 °C |
| 2 Dec 2024, 13:16 | 10.4 | 10.4 °C |
| 18 Nov 2024, 11:29 | 11.3 | 11.3 °C |
| 17 Oct 2024, 10:22 | 12.9 | 12.9 °C |
| 16 Sep 2024, 12:54 | 13.9 | 13.9 °C |
| 22 Aug 2024, 11:46 | 15.2 | 15.2 °C |
| 16 Jul 2024, 14:02 | 15.1 | 15.1 °C |
| 24 Jun 2024, 12:06 | 14.6 | 14.6 °C |
| 13 May 2024, 12:09 | 13.1 | 13.1 °C |
| 19 Apr 2024, 09:48 | 10.5 | 10.5 °C |
pH
code 0061
7.33
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | 7.33 | 7.33 |
| 6 Mar 2026, 09:36 | 6.71 | 6.71 |
| 3 Feb 2026, 12:08 | 6.59 | 6.59 |
| 2 Jan 2026, 12:04 | 6.5 | 6.5 |
| 2 Dec 2025, 13:53 | 6.86 | 6.86 |
| 3 Nov 2025, 11:45 | 7.34 | 7.34 |
| 7 Oct 2025, 12:17 | 7.22 | 7.22 |
| 19 Sep 2025, 12:42 | 7.39 | 7.39 |
| 28 Aug 2025, 12:31 | 7.24 | 7.24 |
| 30 Jul 2025, 12:20 | 7.32 | 7.32 |
| 30 Jun 2025, 15:20 | 7.14 | 7.14 |
| 23 May 2025, 13:41 | 7.65 | 7.65 |
| 23 Apr 2025, 11:53 | 7 | 7 |
| 3 Mar 2025, 12:55 | 6.64 | 6.64 |
| 7 Feb 2025, 10:08 | 6.97 | 6.97 |
| 23 Jan 2025, 10:45 | 6.92 | 6.92 |
| 2 Dec 2024, 13:16 | 6.9 | 6.9 |
| 18 Nov 2024, 11:29 | 7.21 | 7.21 |
| 17 Oct 2024, 10:22 | 6.88 | 6.88 |
| 16 Sep 2024, 12:54 | 7.25 | 7.25 |
| 22 Aug 2024, 11:46 | 7.34 | 7.34 |
| 16 Jul 2024, 14:02 | 7.18 | 7.18 |
| 24 Jun 2024, 12:06 | 7.3 | 7.3 |
| 13 May 2024, 12:09 | 7.08 | 7.08 |
| 19 Apr 2024, 09:48 | 6.75 | 6.75 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2026, 09:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2026, 12:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jan 2026, 12:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Dec 2025, 13:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 11:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Oct 2025, 12:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Sep 2025, 12:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Aug 2025, 12:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jul 2025, 12:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jun 2025, 15:20 | 0.053 | 0.053 mg/l |
| 23 May 2025, 13:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2025, 11:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2025, 12:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Feb 2025, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jan 2025, 10:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Dec 2024, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2024, 11:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2024, 10:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 12:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2024, 11:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jul 2024, 14:02 | 0.038 | 0.038 mg/l |
| 24 Jun 2024, 12:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2024, 12:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Apr 2024, 09:48 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.8 mg/l
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | 1.8 | 1.8 mg/l |
| 6 Mar 2026, 09:36 | 1.9 | 1.9 mg/l |
| 3 Feb 2026, 12:08 | 1.9 | 1.9 mg/l |
| 2 Jan 2026, 12:04 | 4.2 | 4.2 mg/l |
| 2 Dec 2025, 13:53 | 2 | 2 mg/l |
| 3 Nov 2025, 11:45 | 1.8 | 1.8 mg/l |
| 7 Oct 2025, 12:17 | 1.7 | 1.7 mg/l |
| 19 Sep 2025, 12:42 | 1.5 | 1.5 mg/l |
| 28 Aug 2025, 12:31 | 1.7 | 1.7 mg/l |
| 30 Jul 2025, 12:20 | 1.7 | 1.7 mg/l |
| 30 Jun 2025, 15:20 | 1.8 | 1.8 mg/l |
| 23 May 2025, 13:41 | 2.1 | 2.1 mg/l |
| 23 Apr 2025, 11:53 | 2 | 2 mg/l |
| 3 Mar 2025, 12:55 | 2.5 | 2.5 mg/l |
| 7 Feb 2025, 10:08 | 2.5 | 2.5 mg/l |
| 23 Jan 2025, 10:45 | 2.3 | 2.3 mg/l |
| 2 Dec 2024, 13:16 | 2.4 | 2.4 mg/l |
| 18 Nov 2024, 11:29 | 2 | 2 mg/l |
| 17 Oct 2024, 10:22 | 1.9 | 1.9 mg/l |
| 16 Sep 2024, 12:54 | 1.8 | 1.8 mg/l |
| 22 Aug 2024, 11:46 | 1.9 | 1.9 mg/l |
| 16 Jul 2024, 14:02 | 1.8 | 1.8 mg/l |
| 24 Jun 2024, 12:06 | 2 | 2 mg/l |
| 13 May 2024, 12:09 | 0.906 | 0.906 mg/l |
| 19 Apr 2024, 09:48 | 2.4 | 2.4 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.01 mg/l (not detected above this)
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Mar 2026, 09:36 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Feb 2026, 12:08 | 0.012 | 0.012 mg/l |
| 2 Jan 2026, 12:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Dec 2025, 13:53 | 0.018 | 0.018 mg/l |
| 3 Nov 2025, 11:45 | 0.016 | 0.016 mg/l |
| 7 Oct 2025, 12:17 | 0.013 | 0.013 mg/l |
| 19 Sep 2025, 12:42 | 0.021 | 0.021 mg/l |
| 28 Aug 2025, 12:31 | 0.035 | 0.035 mg/l |
| 30 Jul 2025, 12:20 | 0.024 | 0.024 mg/l |
| 30 Jun 2025, 15:20 | 0.027 | 0.027 mg/l |
| 23 May 2025, 13:41 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Apr 2025, 11:53 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Mar 2025, 12:55 | <0.01 | below 0.01 mg/l (not detected above this) |
| 7 Feb 2025, 10:08 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Jan 2025, 10:45 | 0.015 | 0.015 mg/l |
| 2 Dec 2024, 13:16 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Nov 2024, 11:29 | 0.013 | 0.013 mg/l |
| 17 Oct 2024, 10:22 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Sep 2024, 12:54 | 0.02 | 0.02 mg/l |
| 22 Aug 2024, 11:46 | 0.023 | 0.023 mg/l |
| 16 Jul 2024, 14:02 | 0.015 | 0.015 mg/l |
| 24 Jun 2024, 12:06 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 May 2024, 12:09 | 0.032 | 0.032 mg/l |
| 19 Apr 2024, 09:48 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
141 µS/cm
Sampled 1 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Apr 2026, 15:38 | 141 | 141 µS/cm |
| 6 Mar 2026, 09:36 | 138 | 138 µS/cm |
| 3 Feb 2026, 12:08 | 141 | 141 µS/cm |
| 2 Jan 2026, 12:04 | 265 | 265 µS/cm |
| 2 Dec 2025, 13:53 | 147 | 147 µS/cm |
| 3 Nov 2025, 11:45 | 153 | 153 µS/cm |
| 7 Oct 2025, 12:17 | 153 | 153 µS/cm |
| 19 Sep 2025, 12:42 | 162 | 162 µS/cm |
| 28 Aug 2025, 12:31 | 154 | 154 µS/cm |
| 30 Jul 2025, 12:20 | 149 | 149 µS/cm |
| 30 Jun 2025, 15:20 | 148 | 148 µS/cm |
| 23 May 2025, 13:41 | 146 | 146 µS/cm |
| 23 Apr 2025, 11:53 | 140 | 140 µS/cm |
| 3 Mar 2025, 12:55 | 149 | 149 µS/cm |
| 7 Feb 2025, 10:08 | 151 | 151 µS/cm |
| 23 Jan 2025, 10:45 | 145 | 145 µS/cm |
| 2 Dec 2024, 13:16 | 148 | 148 µS/cm |
| 18 Nov 2024, 11:29 | 145 | 145 µS/cm |
| 17 Oct 2024, 10:22 | 146 | 146 µS/cm |
| 16 Sep 2024, 12:54 | 149 | 149 µS/cm |
| 22 Aug 2024, 11:46 | 153 | 153 µS/cm |
| 16 Jul 2024, 14:02 | 145 | 145 µS/cm |
| 24 Jun 2024, 12:06 | 147 | 147 µS/cm |
| 13 May 2024, 12:09 | 109 | 109 µS/cm |
| 19 Apr 2024, 09:48 | 149 | 149 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 | 25 | Apr 2024 – Apr 2026 | 100% 1 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 25 | Apr 2024 – Apr 2026 | 10.9 mg/l 1 Apr 2026 |
| Temperature of Water 0076 | River water | 25 | Apr 2024 – Apr 2026 | 11.6 °C 1 Apr 2026 |
| pH 0061 | River water | 25 | Apr 2024 – Apr 2026 | 7.33 1 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | Apr 2024 – Apr 2026 | below 0.03 mg/l 1 Apr 2026 |
| Nitrate as N 0117 | River water | 25 | Apr 2024 – Apr 2026 | 1.8 mg/l 1 Apr 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Apr 2024 – Apr 2026 | below 0.01 mg/l 1 Apr 2026 |
| Conductivity at 25 C 0077 | River water | 25 | Apr 2024 – Apr 2026 | 141 µS/cm 1 Apr 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 24 | Apr 2024 – Apr 2026 | 12 mg/l 1 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 25 | Apr 2024 – Apr 2026 | below 0.00013 mg/l 1 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 25 | Apr 2024 – Apr 2026 | 1.1 mg/l 1 Apr 2026 |
| Nitrite as N 0118 | River water | 25 | Apr 2024 – Apr 2026 | below 0.004 mg/l 1 Apr 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 25 | Apr 2024 – Apr 2026 | 1.8 mg/l 1 Apr 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.