Derry Brook at Roadbridge, Ashton Keynes
EA name: DERRY BROOK AT ROADBRIDGE, ASHTON KEYNES
Environment Agency sampling point TH-PUTR0043 · 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
- 18 Aug 2026, 09:5844 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 22 since 20 Jun 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 404752, 192801As published, to the nearest 1 m. Open in a map
- River, by its own name
- Derry Brook
- River, by the map
- Derry BrookPlaced on the river its name gives, 6 m from the line.
- Next gauge downstream
- Cricklade On the River Thames · 6.3 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (22 samples)
6 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
80.9%
Sampled 15 Apr 2026, 6 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | 80.9 | 80.9% |
| 10 Mar 2026, 12:35 | 68.9 | 68.9% |
| 6 Feb 2026, 10:04 | 81.2 | 81.2% |
| 13 Jan 2026, 12:54 | 76.3 | 76.3% |
| 9 Dec 2025, 11:42 | 82.1 | 82.1% |
| 7 Nov 2025, 08:44 | 41.1 | 41.1% |
| 3 Apr 2025, 12:34 | 50.7 | 50.7% |
| 4 Mar 2025, 10:18 | 37.6 | 37.6% |
| 3 Feb 2025, 10:43 | 41.1 | 41.1% |
| 3 Jan 2025, 09:34 | 82 | 82% |
| 6 Dec 2024, 11:51 | 78.5 | 78.5% |
| 4 Nov 2024, 10:57 | 33.1 | 33.1% |
| 10 Oct 2024, 10:08 | 37.1 | 37.1% |
| 4 Sep 2024, 11:35 | 54.4 | 54.4% |
| 12 Jul 2024, 13:25 | 42.5 | 42.5% |
| 20 Jun 2024, 13:26 | 37.5 | 37.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.97 mg/l
Sampled 15 Apr 2026, 6 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | 8.97 | 8.97 mg/l |
| 10 Mar 2026, 12:35 | 7.97 | 7.97 mg/l |
| 6 Feb 2026, 10:04 | 9.75 | 9.75 mg/l |
| 13 Jan 2026, 12:54 | 9.2 | 9.2 mg/l |
| 9 Dec 2025, 11:42 | 9.01 | 9.01 mg/l |
| 7 Nov 2025, 08:44 | 4.41 | 4.41 mg/l |
| 3 Apr 2025, 12:34 | 5.79 | 5.79 mg/l |
| 4 Mar 2025, 10:18 | 4.9 | 4.9 mg/l |
| 3 Feb 2025, 10:43 | 5.05 | 5.05 mg/l |
| 3 Jan 2025, 09:34 | 11 | 11 mg/l |
| 6 Dec 2024, 11:51 | 9.64 | 9.64 mg/l |
| 4 Nov 2024, 10:57 | 3.53 | 3.53 mg/l |
| 10 Oct 2024, 10:08 | 4.05 | 4.05 mg/l |
| 4 Sep 2024, 11:35 | 5.37 | 5.37 mg/l |
| 12 Jul 2024, 13:25 | 4.23 | 4.23 mg/l |
| 20 Jun 2024, 13:26 | 3.72 | 3.72 mg/l |
Water temperature
code 0076 · °C
10.7 °C
Sampled 15 Apr 2026, 6 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | 10.7 | 10.7 °C |
| 10 Mar 2026, 12:35 | 8.9 | 8.9 °C |
| 6 Feb 2026, 10:04 | 7.4 | 7.4 °C |
| 13 Jan 2026, 12:54 | 7.2 | 7.2 °C |
| 9 Dec 2025, 11:42 | 11.1 | 11.1 °C |
| 7 Nov 2025, 08:44 | 12.1 | 12.1 °C |
| 3 Apr 2025, 12:34 | 9.4 | 9.4 °C |
| 4 Mar 2025, 10:18 | 4.2 | 4.2 °C |
| 3 Feb 2025, 10:43 | 6.5 | 6.5 °C |
| 3 Jan 2025, 09:34 | 3.2 | 3.2 °C |
| 6 Dec 2024, 11:51 | 6.5 | 6.5 °C |
| 4 Nov 2024, 10:57 | 12.3 | 12.3 °C |
| 10 Oct 2024, 10:08 | 11.3 | 11.3 °C |
| 4 Sep 2024, 11:35 | 15.9 | 15.9 °C |
| 12 Jul 2024, 13:25 | 15.5 | 15.5 °C |
| 20 Jun 2024, 13:26 | 15.6 | 15.6 °C |
pH
code 0061
7.56
Sampled 15 Apr 2026, 6 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | 7.56 | 7.56 |
| 10 Mar 2026, 12:35 | 7.62 | 7.62 |
| 6 Feb 2026, 10:04 | 7.67 | 7.67 |
| 13 Jan 2026, 12:54 | 7.54 | 7.54 |
| 9 Dec 2025, 11:42 | 7.92 | 7.92 |
| 7 Nov 2025, 08:44 | 7.52 | 7.52 |
| 3 Apr 2025, 12:34 | 7.5 | 7.5 |
| 4 Mar 2025, 10:18 | 7.24 | 7.24 |
| 3 Feb 2025, 10:43 | 7.34 | 7.34 |
| 3 Jan 2025, 09:34 | 7.68 | 7.68 |
| 6 Dec 2024, 11:51 | 7.59 | 7.59 |
| 4 Nov 2024, 10:57 | 7.22 | 7.22 |
| 10 Oct 2024, 10:08 | 7.51 | 7.51 |
| 4 Sep 2024, 11:35 | 7.54 | 7.54 |
| 12 Jul 2024, 13:25 | 7.35 | 7.35 |
| 20 Jun 2024, 13:26 | 7.41 | 7.41 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 15 Apr 2026, 6 months ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Mar 2026, 12:35 | 0.033 | 0.033 mg/l |
| 6 Feb 2026, 10:04 | 0.045 | 0.045 mg/l |
| 13 Jan 2026, 12:54 | 0.03 | 0.03 mg/l |
| 9 Dec 2025, 11:42 | 0.054 | 0.054 mg/l |
| 7 Nov 2025, 08:44 | 1.9 | 1.9 mg/l |
| 4 Mar 2025, 10:18 | 0.051 | 0.051 mg/l |
| 3 Feb 2025, 10:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jan 2025, 09:34 | 0.12 | 0.12 mg/l |
| 4 Nov 2024, 10:57 | 0.048 | 0.048 mg/l |
| 10 Oct 2024, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Sep 2024, 11:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jul 2024, 13:25 | 0.54 | 0.54 mg/l |
| 20 Jun 2024, 13:26 | 1.3 | 1.3 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.2 mg/l
Sampled 15 Apr 2026, 6 months ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | 1.2 | 1.2 mg/l |
| 10 Mar 2026, 12:35 | 1.49 | 1.49 mg/l |
| 6 Feb 2026, 10:04 | 1.59 | 1.59 mg/l |
| 13 Jan 2026, 12:54 | 1.69 | 1.69 mg/l |
| 9 Dec 2025, 11:42 | 1.99 | 1.99 mg/l |
| 7 Nov 2025, 08:44 | 0.35 | 0.35 mg/l |
| 4 Mar 2025, 10:18 | 0.485 | 0.485 mg/l |
| 3 Feb 2025, 10:43 | 2.8 | 2.8 mg/l |
| 3 Jan 2025, 09:34 | 0.785 | 0.785 mg/l |
| 4 Nov 2024, 10:57 | 1.79 | 1.79 mg/l |
| 10 Oct 2024, 10:08 | 0.191 | 0.191 mg/l |
| 4 Sep 2024, 11:35 | <0.196 | below 0.196 mg/l (not detected above this) |
| 12 Jul 2024, 13:25 | 1.61 | 1.61 mg/l |
| 20 Jun 2024, 13:26 | 1.82 | 1.82 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.074 mg/l
Sampled 15 Apr 2026, 6 months ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | 0.074 | 0.074 mg/l |
| 10 Mar 2026, 12:35 | 0.13 | 0.13 mg/l |
| 6 Feb 2026, 10:04 | 0.067 | 0.067 mg/l |
| 13 Jan 2026, 12:54 | 0.081 | 0.081 mg/l |
| 9 Dec 2025, 11:42 | 0.14 | 0.14 mg/l |
| 7 Nov 2025, 08:44 | 0.13 | 0.13 mg/l |
| 4 Mar 2025, 10:18 | 0.059 | 0.059 mg/l |
| 3 Feb 2025, 10:43 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Jan 2025, 09:34 | 0.14 | 0.14 mg/l |
| 4 Nov 2024, 10:57 | 0.016 | 0.016 mg/l |
| 10 Oct 2024, 10:08 | 0.071 | 0.071 mg/l |
| 4 Sep 2024, 11:35 | 0.25 | 0.25 mg/l |
| 12 Jul 2024, 13:25 | 0.22 | 0.22 mg/l |
| 20 Jun 2024, 13:26 | 0.17 | 0.17 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
688 µS/cm
Sampled 15 Apr 2026, 6 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 12:48 | 688 | 688 µS/cm |
| 10 Mar 2026, 12:35 | 484 | 484 µS/cm |
| 6 Feb 2026, 10:04 | 325 | 325 µS/cm |
| 13 Jan 2026, 12:54 | 355 | 355 µS/cm |
| 9 Dec 2025, 11:42 | 318 | 318 µS/cm |
| 7 Nov 2025, 08:44 | 942 | 942 µS/cm |
| 3 Apr 2025, 12:34 | 726 | 726 µS/cm |
| 4 Mar 2025, 10:18 | 653 | 653 µS/cm |
| 3 Feb 2025, 10:43 | 617 | 617 µS/cm |
| 3 Jan 2025, 09:34 | 457 | 457 µS/cm |
| 6 Dec 2024, 11:51 | 237 | 237 µS/cm |
| 4 Nov 2024, 10:57 | 610 | 610 µS/cm |
| 10 Oct 2024, 10:08 | 468 | 468 µS/cm |
| 4 Sep 2024, 11:35 | 720 | 720 µS/cm |
| 12 Jul 2024, 13:25 | 705 | 705 µS/cm |
| 20 Jun 2024, 13:26 | 748 | 748 µS/cm |
Everything measured here
14 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 14 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 16 | Jun 2024 – Apr 2026 | 80.9% 15 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 16 | Jun 2024 – Apr 2026 | 8.97 mg/l 15 Apr 2026 |
| Temperature of Water 0076 | River water | 16 | Jun 2024 – Apr 2026 | 10.7 °C 15 Apr 2026 |
| pH 0061 | River water | 16 | Jun 2024 – Apr 2026 | 7.56 15 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 14 | Jun 2024 – Apr 2026 | below 0.03 mg/l 15 Apr 2026 |
| Nitrate as N 0117 | River water | 14 | Jun 2024 – Apr 2026 | 1.2 mg/l 15 Apr 2026 |
| Orthophosphate, reactive as P 0180 | River water | 14 | Jun 2024 – Apr 2026 | 0.074 mg/l 15 Apr 2026 |
| Conductivity at 25 C 0077 | River water | 16 | Jun 2024 – Apr 2026 | 688 µS/cm 15 Apr 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 14 | Jun 2024 – Apr 2026 | 250 mg/l 15 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 14 | Jun 2024 – Apr 2026 | below 0.00021 mg/l 15 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 15 | Jun 2024 – Apr 2026 | 3 mg/l 15 Apr 2026 |
| Nitrite as N 0118 | River water | 14 | Jun 2024 – Apr 2026 | 0.0044 mg/l 15 Apr 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 14 | Jun 2024 – Apr 2026 | 1.2 mg/l 15 Apr 2026 |
| No flow /No sample 7668 | River water | 6 | Aug 2024 – Aug 2026 | No flow/discharge at sampling point 18 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.