Small Brook at Youldon Bridge
EA name: SMALL BROOK AT YOULDON BRIDGE (also listed as “SMALL BROOK (TAMAR) AT YOULDON BRIDGE”)
Environment Agency sampling point SW-91212027 · 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 Aug 2026, 13:2159 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 18 since 2 Oct 2023 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 229954, 105256As published, to the nearest 1 m. Open in a map
- River, by its own name
- Small Brook
- River, by the map
- Small BrookPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Bridge Rule On the River Tamar · 5.3 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (12 samples)
Monitoring (national agency policy) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93.3%
Sampled 3 Aug 2026, 59 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | 93.3 | 93.3% |
| 14 Jul 2026, 12:11 | 84.5 | 84.5% |
| 8 Jun 2026, 13:50 | 92.7 | 92.7% |
| 8 May 2026, 11:59 | 95.1 | 95.1% |
| 10 Apr 2026, 12:06 | 95.6 | 95.6% |
| 3 Dec 2024, 14:29 | 94.6 | 94.6% |
| 1 Nov 2024, 12:05 | 93.9 | 93.9% |
| 2 Oct 2024, 10:01 | 94.1 | 94.1% |
| 4 Sep 2024, 10:46 | 97.1 | 97.1% |
| 2 Aug 2024, 11:03 | 94.9 | 94.9% |
| 3 Jul 2024, 14:16 | 94.5 | 94.5% |
| 4 Jun 2024, 12:37 | 90.9 | 90.9% |
| 4 Mar 2024, 11:06 | 94.2 | 94.2% |
| 1 Feb 2024, 12:00 | 95.3 | 95.3% |
| 12 Jan 2024, 12:26 | 97 | 97% |
| 5 Dec 2023, 13:15 | 93 | 93% |
| 16 Nov 2023, 12:59 | 88 | 88% |
| 2 Oct 2023, 11:32 | 88.6 | 88.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.22 mg/l
Sampled 3 Aug 2026, 59 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | 9.22 | 9.22 mg/l |
| 14 Jul 2026, 12:11 | 7.98 | 7.98 mg/l |
| 8 Jun 2026, 13:50 | 9.64 | 9.64 mg/l |
| 8 May 2026, 11:59 | 10.2 | 10.2 mg/l |
| 10 Apr 2026, 12:06 | 10.9 | 10.9 mg/l |
| 3 Dec 2024, 14:29 | 10.9 | 10.9 mg/l |
| 1 Nov 2024, 12:05 | 10.2 | 10.2 mg/l |
| 2 Oct 2024, 10:01 | 10 | 10 mg/l |
| 4 Sep 2024, 10:46 | 9.92 | 9.92 mg/l |
| 2 Aug 2024, 11:03 | 9.42 | 9.42 mg/l |
| 3 Jul 2024, 14:16 | 9.74 | 9.74 mg/l |
| 4 Jun 2024, 12:37 | 9.41 | 9.41 mg/l |
| 4 Mar 2024, 11:06 | 11.5 | 11.5 mg/l |
| 1 Feb 2024, 12:00 | 11.3 | 11.3 mg/l |
| 12 Jan 2024, 12:26 | 12.2 | 12.2 mg/l |
| 5 Dec 2023, 13:15 | 11 | 11 mg/l |
| 16 Nov 2023, 12:59 | 10.1 | 10.1 mg/l |
| 2 Oct 2023, 11:32 | 8.91 | 8.91 mg/l |
Water temperature
code 0076 · °C
15.8 °C
Sampled 3 Aug 2026, 59 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | 15.8 | 15.8 °C |
| 14 Jul 2026, 12:11 | 18 | 18 °C |
| 8 Jun 2026, 13:50 | 13.5 | 13.5 °C |
| 8 May 2026, 11:59 | 12.1 | 12.1 °C |
| 10 Apr 2026, 12:06 | 9.4 | 9.4 °C |
| 3 Dec 2024, 14:29 | 9.2 | 9.2 °C |
| 1 Nov 2024, 12:05 | 11.5 | 11.5 °C |
| 2 Oct 2024, 10:01 | 12.5 | 12.5 °C |
| 4 Sep 2024, 10:46 | 14.3 | 14.3 °C |
| 2 Aug 2024, 11:03 | 15.6 | 15.6 °C |
| 3 Jul 2024, 14:16 | 13.9 | 13.9 °C |
| 4 Jun 2024, 12:37 | 13.7 | 13.7 °C |
| 4 Mar 2024, 11:06 | 6.8 | 6.8 °C |
| 1 Feb 2024, 12:00 | 7.9 | 7.9 °C |
| 12 Jan 2024, 12:26 | 5.5 | 5.5 °C |
| 5 Dec 2023, 13:15 | 7.9 | 7.9 °C |
| 16 Nov 2023, 12:59 | 9.4 | 9.4 °C |
| 2 Oct 2023, 11:32 | 15 | 15 °C |
pH
code 0061
7.64
Sampled 3 Aug 2026, 59 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | 7.64 | 7.64 |
| 14 Jul 2026, 12:11 | 7.47 | 7.47 |
| 8 Jun 2026, 13:50 | 7.06 | 7.06 |
| 8 May 2026, 11:59 | 7.51 | 7.51 |
| 10 Apr 2026, 12:06 | 7.48 | 7.48 |
| 3 Dec 2024, 14:29 | 7.12 | 7.12 |
| 1 Nov 2024, 12:05 | 7.34 | 7.34 |
| 2 Oct 2024, 10:01 | 7.29 | 7.29 |
| 4 Sep 2024, 10:46 | 7.75 | 7.75 |
| 2 Aug 2024, 11:03 | 7.91 | 7.91 |
| 3 Jul 2024, 14:16 | 7.63 | 7.63 |
| 4 Jun 2024, 12:37 | 7.68 | 7.68 |
| 4 Mar 2024, 11:06 | 7.27 | 7.27 |
| 1 Feb 2024, 12:00 | 7.1 | 7.1 |
| 12 Jan 2024, 12:26 | 7.47 | 7.47 |
| 5 Dec 2023, 13:15 | 6.96 | 6.96 |
| 16 Nov 2023, 12:59 | 6.79 | 6.79 |
| 2 Oct 2023, 11:32 | 7.35 | 7.35 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 3 Aug 2026, 59 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Jul 2026, 12:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jun 2026, 13:50 | 0.16 | 0.16 mg/l |
| 8 May 2026, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Apr 2026, 12:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2024, 14:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Nov 2024, 12:05 | 0.037 | 0.037 mg/l |
| 2 Oct 2024, 10:01 | 0.035 | 0.035 mg/l |
| 4 Sep 2024, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Aug 2024, 11:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2024, 14:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2024, 12:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2024, 11:06 | 0.11 | 0.11 mg/l |
| 1 Feb 2024, 12:00 | 0.068 | 0.068 mg/l |
| 12 Jan 2024, 12:26 | 0.089 | 0.089 mg/l |
| 5 Dec 2023, 13:15 | 0.37 | 0.37 mg/l |
| 16 Nov 2023, 12:59 | 0.17 | 0.17 mg/l |
| 2 Oct 2023, 11:32 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.846 mg/l
Sampled 3 Aug 2026, 59 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | 0.846 | 0.846 mg/l |
| 14 Jul 2026, 12:11 | 0.806 | 0.806 mg/l |
| 8 Jun 2026, 13:50 | 1.78 | 1.78 mg/l |
| 8 May 2026, 11:59 | 1.19 | 1.19 mg/l |
| 10 Apr 2026, 12:06 | 1.69 | 1.69 mg/l |
| 1 Nov 2024, 12:05 | 2.29 | 2.29 mg/l |
| 2 Oct 2024, 10:01 | 2.59 | 2.59 mg/l |
| 4 Sep 2024, 10:46 | 0.996 | 0.996 mg/l |
| 2 Aug 2024, 11:03 | 1.7 | 1.7 mg/l |
| 3 Jul 2024, 14:16 | 1.2 | 1.2 mg/l |
| 4 Jun 2024, 12:37 | 1.69 | 1.69 mg/l |
| 4 Mar 2024, 11:06 | 2.29 | 2.29 mg/l |
| 1 Feb 2024, 12:00 | 1.78 | 1.78 mg/l |
| 12 Jan 2024, 12:26 | 2.78 | 2.78 mg/l |
| 5 Dec 2023, 13:15 | 1.78 | 1.78 mg/l |
| 16 Nov 2023, 12:59 | 1.39 | 1.39 mg/l |
| 2 Oct 2023, 11:32 | 1.89 | 1.89 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.049 mg/l
Sampled 3 Aug 2026, 59 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | 0.049 | 0.049 mg/l |
| 14 Jul 2026, 12:11 | 0.054 | 0.054 mg/l |
| 8 Jun 2026, 13:50 | 0.22 | 0.22 mg/l |
| 8 May 2026, 11:59 | 0.053 | 0.053 mg/l |
| 10 Apr 2026, 12:06 | 0.033 | 0.033 mg/l |
| 1 Nov 2024, 12:05 | 0.025 | 0.025 mg/l |
| 2 Oct 2024, 10:01 | 0.047 | 0.047 mg/l |
| 4 Sep 2024, 10:46 | 0.04 | 0.04 mg/l |
| 2 Aug 2024, 11:03 | 0.039 | 0.039 mg/l |
| 3 Jul 2024, 14:16 | 0.034 | 0.034 mg/l |
| 4 Jun 2024, 12:37 | 0.06 | 0.06 mg/l |
| 4 Mar 2024, 11:06 | 0.035 | 0.035 mg/l |
| 1 Feb 2024, 12:00 | 0.028 | 0.028 mg/l |
| 12 Jan 2024, 12:26 | 0.021 | 0.021 mg/l |
| 5 Dec 2023, 13:15 | 0.055 | 0.055 mg/l |
| 16 Nov 2023, 12:59 | 0.052 | 0.052 mg/l |
| 2 Oct 2023, 11:32 | 0.034 | 0.034 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
381 µS/cm
Sampled 3 Aug 2026, 59 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 13:21 | 381 | 381 µS/cm |
| 14 Jul 2026, 12:11 | 359 | 359 µS/cm |
| 8 Jun 2026, 13:50 | 196 | 196 µS/cm |
| 8 May 2026, 11:59 | 263 | 263 µS/cm |
| 10 Apr 2026, 12:06 | 223 | 223 µS/cm |
| 3 Dec 2024, 14:29 | 208 | 208 µS/cm |
| 1 Nov 2024, 12:05 | 222 | 222 µS/cm |
| 2 Oct 2024, 10:01 | 209 | 209 µS/cm |
| 4 Sep 2024, 10:46 | 260 | 260 µS/cm |
| 2 Aug 2024, 11:03 | 240 | 240 µS/cm |
| 3 Jul 2024, 14:16 | 270 | 270 µS/cm |
| 4 Jun 2024, 12:37 | 234 | 234 µS/cm |
| 4 Mar 2024, 11:06 | 194 | 194 µS/cm |
| 1 Feb 2024, 12:00 | 210 | 210 µS/cm |
| 12 Jan 2024, 12:26 | 237 | 237 µS/cm |
| 5 Dec 2023, 13:15 | 184 | 184 µS/cm |
| 16 Nov 2023, 12:59 | 155 | 155 µS/cm |
| 2 Oct 2023, 11:32 | 221 | 221 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 – Aug 2026 | 93.3% 3 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 18 | Oct 2023 – Aug 2026 | 9.22 mg/l 3 Aug 2026 |
| Temperature of Water 0076 | River water | 18 | Oct 2023 – Aug 2026 | 15.8 °C 3 Aug 2026 |
| pH 0061 | River water | 18 | Oct 2023 – Aug 2026 | 7.64 3 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 18 | Oct 2023 – Aug 2026 | below 0.03 mg/l 3 Aug 2026 |
| Nitrate as N 0117 | River water | 17 | Oct 2023 – Aug 2026 | 0.846 mg/l 3 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 17 | Oct 2023 – Aug 2026 | 0.049 mg/l 3 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 18 | Oct 2023 – Aug 2026 | 381 µS/cm 3 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 18 | Oct 2023 – Aug 2026 | 73 mg/l 3 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 18 | Oct 2023 – Aug 2026 | below 0.00037 mg/l 3 Aug 2026 |
| Nitrite as N 0118 | River water | 18 | Oct 2023 – Aug 2026 | below 0.004 mg/l 3 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 17 | Oct 2023 – Aug 2026 | 0.85 mg/l 3 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 6 | Oct 2023 – Mar 2024 | 7.6 mg/l 4 Mar 2024 |
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.