Arrow River Castle Road Studley
EA name: ARROW RIVER CASTLE RD STUDLEY
Environment Agency sampling point MD-08019580 · 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
- 29 May 2026, 09:114 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 16 Oct 2023 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 407630, 263930As published, to the nearest 10 m. Open in a map
- River, by its own name
- Arrow
- River, by the map
- River ArrowPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Broom On the River Arrow · 16 km along the river
- Nearest gauge upstream
- Studley On the River Arrow · 0.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (17 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
80.1%
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 80.1 | 80.1% |
| 12 Mar 2026, 11:59 | 98.1 | 98.1% |
| 6 Feb 2026, 10:50 | 98.3 | 98.3% |
| 16 Jan 2026, 12:52 | 98.7 | 98.7% |
| 4 Mar 2025, 11:05 | 103.8 | 103.8% |
| 30 Jan 2025, 12:10 | 100.4 | 100.4% |
| 12 Dec 2024, 10:14 | 91.9 | 91.9% |
| 21 Nov 2024, 10:17 | 90.3 | 90.3% |
| 16 Oct 2024, 11:01 | 94.1 | 94.1% |
| 16 Sep 2024, 12:38 | 101.1 | 101.1% |
| 16 May 2024, 12:04 | 107.4 | 107.4% |
| 19 Mar 2024, 10:21 | 98.2 | 98.2% |
| 19 Feb 2024, 10:27 | 97.8 | 97.8% |
| 23 Jan 2024, 12:49 | 96.7 | 96.7% |
| 12 Dec 2023, 10:45 | 96.8 | 96.8% |
| 21 Nov 2023, 12:33 | 94.7 | 94.7% |
| 16 Oct 2023, 11:01 | 97 | 97% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.8 mg/l
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 7.8 | 7.8 mg/l |
| 12 Mar 2026, 11:59 | 11.3 | 11.3 mg/l |
| 6 Feb 2026, 10:50 | 12 | 12 mg/l |
| 16 Jan 2026, 12:52 | 12.1 | 12.1 mg/l |
| 4 Mar 2025, 11:05 | 12.6 | 12.6 mg/l |
| 30 Jan 2025, 12:10 | 12.4 | 12.4 mg/l |
| 12 Dec 2024, 10:14 | 11.1 | 11.1 mg/l |
| 21 Nov 2024, 10:17 | 11.6 | 11.6 mg/l |
| 16 Oct 2024, 11:01 | 9.85 | 9.85 mg/l |
| 16 Sep 2024, 12:38 | 10.5 | 10.5 mg/l |
| 16 May 2024, 12:04 | 10.9 | 10.9 mg/l |
| 19 Mar 2024, 10:21 | 10.9 | 10.9 mg/l |
| 19 Feb 2024, 10:27 | 11.1 | 11.1 mg/l |
| 23 Jan 2024, 12:49 | 11.8 | 11.8 mg/l |
| 12 Dec 2023, 10:45 | 11.6 | 11.6 mg/l |
| 21 Nov 2023, 12:33 | 10.6 | 10.6 mg/l |
| 16 Oct 2023, 11:01 | 11.2 | 11.2 mg/l |
Water temperature
code 0076 · °C
16.5 °C
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 16.5 | 16.5 °C |
| 12 Mar 2026, 11:59 | 9.1 | 9.1 °C |
| 6 Feb 2026, 10:50 | 6.6 | 6.6 °C |
| 16 Jan 2026, 12:52 | 6.4 | 6.4 °C |
| 4 Mar 2025, 11:05 | 6.9 | 6.9 °C |
| 30 Jan 2025, 12:10 | 6.1 | 6.1 °C |
| 12 Dec 2024, 10:14 | 7.1 | 7.1 °C |
| 21 Nov 2024, 10:17 | 4.8 | 4.8 °C |
| 16 Oct 2024, 11:01 | 13.2 | 13.2 °C |
| 16 Sep 2024, 12:38 | 13.6 | 13.6 °C |
| 16 May 2024, 12:04 | 14.7 | 14.7 °C |
| 19 Mar 2024, 10:21 | 10.5 | 10.5 °C |
| 19 Feb 2024, 10:27 | 9.7 | 9.7 °C |
| 23 Jan 2024, 12:49 | 6.9 | 6.9 °C |
| 12 Dec 2023, 10:45 | 7.5 | 7.5 °C |
| 21 Nov 2023, 12:33 | 10.2 | 10.2 °C |
| 16 Oct 2023, 11:01 | 9 | 9 °C |
pH
code 0061
7.99
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 7.99 | 7.99 |
| 12 Mar 2026, 11:59 | 8.26 | 8.26 |
| 6 Feb 2026, 10:50 | 8.04 | 8.04 |
| 16 Jan 2026, 12:52 | 7.79 | 7.79 |
| 4 Mar 2025, 11:05 | 8.28 | 8.28 |
| 30 Jan 2025, 12:10 | 8.02 | 8.02 |
| 12 Dec 2024, 10:14 | 8.01 | 8.01 |
| 21 Nov 2024, 10:17 | 8.01 | 8.01 |
| 16 Oct 2024, 11:01 | 7.9 | 7.9 |
| 16 Sep 2024, 12:38 | 8.17 | 8.17 |
| 16 May 2024, 12:04 | 8.33 | 8.33 |
| 19 Mar 2024, 10:21 | 8.08 | 8.08 |
| 19 Feb 2024, 10:27 | 7.85 | 7.85 |
| 23 Jan 2024, 12:49 | 8.08 | 8.08 |
| 12 Dec 2023, 10:45 | 7.95 | 7.95 |
| 21 Nov 2023, 12:33 | 8 | 8 |
| 16 Oct 2023, 11:01 | 7.96 | 7.96 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.14 mg/l
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 0.14 | 0.14 mg/l |
| 12 Mar 2026, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2026, 10:50 | 0.095 | 0.095 mg/l |
| 16 Jan 2026, 12:52 | 0.049 | 0.049 mg/l |
| 4 Mar 2025, 11:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jan 2025, 12:10 | 0.063 | 0.063 mg/l |
| 12 Dec 2024, 10:14 | 0.06 | 0.06 mg/l |
| 21 Nov 2024, 10:17 | 0.057 | 0.057 mg/l |
| 16 Oct 2024, 11:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 May 2024, 12:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2024, 10:21 | 0.086 | 0.086 mg/l |
| 19 Feb 2024, 10:27 | 0.073 | 0.073 mg/l |
| 23 Jan 2024, 12:49 | 0.15 | 0.15 mg/l |
| 12 Dec 2023, 10:45 | 0.067 | 0.067 mg/l |
| 21 Nov 2023, 12:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2023, 11:01 | 0.031 | 0.031 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.72 mg/l
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 2.72 | 2.72 mg/l |
| 12 Mar 2026, 11:59 | 3.49 | 3.49 mg/l |
| 6 Feb 2026, 10:50 | 1.69 | 1.69 mg/l |
| 16 Jan 2026, 12:52 | 3.29 | 3.29 mg/l |
| 4 Mar 2025, 11:05 | 3.08 | 3.08 mg/l |
| 30 Jan 2025, 12:10 | 3.08 | 3.08 mg/l |
| 12 Dec 2024, 10:14 | 2.68 | 2.68 mg/l |
| 21 Nov 2024, 10:17 | 3.48 | 3.48 mg/l |
| 16 Oct 2024, 11:01 | 1.88 | 1.88 mg/l |
| 16 Sep 2024, 12:38 | 2.79 | 2.79 mg/l |
| 16 May 2024, 12:04 | 3.58 | 3.58 mg/l |
| 19 Mar 2024, 10:21 | 2.48 | 2.48 mg/l |
| 19 Feb 2024, 10:27 | 2.38 | 2.38 mg/l |
| 23 Jan 2024, 12:49 | 2.57 | 2.57 mg/l |
| 12 Dec 2023, 10:45 | 2.68 | 2.68 mg/l |
| 21 Nov 2023, 12:33 | 2.59 | 2.59 mg/l |
| 16 Oct 2023, 11:01 | 3.19 | 3.19 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.18 mg/l
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 0.18 | 0.18 mg/l |
| 12 Mar 2026, 11:59 | 0.091 | 0.091 mg/l |
| 6 Feb 2026, 10:50 | 0.19 | 0.19 mg/l |
| 16 Jan 2026, 12:52 | 0.17 | 0.17 mg/l |
| 4 Mar 2025, 11:05 | 0.083 | 0.083 mg/l |
| 30 Jan 2025, 12:10 | 0.15 | 0.15 mg/l |
| 12 Dec 2024, 10:14 | 0.14 | 0.14 mg/l |
| 21 Nov 2024, 10:17 | 0.2 | 0.2 mg/l |
| 16 Oct 2024, 11:01 | 0.2 | 0.2 mg/l |
| 16 Sep 2024, 12:38 | 0.41 | 0.41 mg/l |
| 16 May 2024, 12:04 | 0.29 | 0.29 mg/l |
| 19 Mar 2024, 10:21 | 0.18 | 0.18 mg/l |
| 19 Feb 2024, 10:27 | 0.21 | 0.21 mg/l |
| 23 Jan 2024, 12:49 | 0.17 | 0.17 mg/l |
| 12 Dec 2023, 10:45 | 0.17 | 0.17 mg/l |
| 21 Nov 2023, 12:33 | 0.29 | 0.29 mg/l |
| 16 Oct 2023, 11:01 | 0.24 | 0.24 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
911 µS/cm
Sampled 29 May 2026, 4 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:11 | 911 | 911 µS/cm |
| 12 Mar 2026, 11:59 | 824 | 824 µS/cm |
| 6 Feb 2026, 10:50 | 334 | 334 µS/cm |
| 16 Jan 2026, 12:52 | 554 | 554 µS/cm |
| 4 Mar 2025, 11:05 | 862 | 862 µS/cm |
| 30 Jan 2025, 12:10 | 680 | 680 µS/cm |
| 12 Dec 2024, 10:14 | 699 | 699 µS/cm |
| 21 Nov 2024, 10:17 | 728 | 728 µS/cm |
| 16 Oct 2024, 11:01 | 543 | 543 µS/cm |
| 16 Sep 2024, 12:38 | 997 | 997 µS/cm |
| 16 May 2024, 12:04 | 822 | 822 µS/cm |
| 19 Mar 2024, 10:21 | 611 | 611 µS/cm |
| 19 Feb 2024, 10:27 | 512 | 512 µS/cm |
| 23 Jan 2024, 12:49 | 616 | 616 µS/cm |
| 12 Dec 2023, 10:45 | 530 | 530 µS/cm |
| 21 Nov 2023, 12:33 | 683 | 683 µS/cm |
| 16 Oct 2023, 11:01 | 769 | 769 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 | 17 | Oct 2023 – May 2026 | 80.1% 29 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 17 | Oct 2023 – May 2026 | 7.8 mg/l 29 May 2026 |
| Temperature of Water 0076 | River water | 17 | Oct 2023 – May 2026 | 16.5 °C 29 May 2026 |
| pH 0061 | River water | 17 | Oct 2023 – May 2026 | 7.99 29 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 17 | Oct 2023 – May 2026 | 0.14 mg/l 29 May 2026 |
| Nitrate as N 0117 | River water | 17 | Oct 2023 – May 2026 | 2.72 mg/l 29 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 17 | Oct 2023 – May 2026 | 0.18 mg/l 29 May 2026 |
| Conductivity at 25 C 0077 | River water | 17 | Oct 2023 – May 2026 | 911 µS/cm 29 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 17 | Oct 2023 – May 2026 | 270 mg/l 29 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 17 | Oct 2023 – May 2026 | 0.00401 mg/l 29 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 13 | Feb 2024 – May 2026 | 1.7 mg/l 29 May 2026 |
| Nitrite as N 0118 | River water | 17 | Oct 2023 – May 2026 | 0.084 mg/l 29 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 17 | Oct 2023 – May 2026 | 2.8 mg/l 29 May 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.