River Tamar at Crowford Bridge
EA name: RIVER TAMAR AT CROWFORD BRIDGE
Environment Agency sampling point SW-91210168 · 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
- 15 Sep 2026, 09:5516 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 20 since 19 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 228720, 99425As published, to the nearest 1 m. Open in a map
- River, by its own name
- Tamar
- River, by the map
- River TamarPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- Crowford Bridge On the River Tamar · 0.7 km along the river
- Nearest gauge upstream
- Bridge Rule On the River Tamar · 5.5 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (13 samples)
Planned investigation (local monitoring) (7 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
87.6%
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | 87.6 | 87.6% |
| 3 Aug 2026, 12:22 | 112.3 | 112.3% |
| 17 Jul 2026, 13:53 | 128.3 | 128.3% |
| 4 Jun 2026, 12:08 | 97 | 97% |
| 12 May 2026, 09:44 | 93.4 | 93.4% |
| 7 Apr 2026, 10:47 | 99.5 | 99.5% |
| 9 Dec 2024, 15:36 | 99 | 99% |
| 5 Nov 2024, 11:07 | 94.1 | 94.1% |
| 14 Oct 2024, 12:46 | 91.1 | 91.1% |
| 11 Sep 2024, 12:45 | 93.2 | 93.2% |
| 8 Aug 2024, 10:23 | 93.2 | 93.2% |
| 9 Jul 2024, 10:39 | 93.2 | 93.2% |
| 5 Jun 2024, 12:54 | 108.1 | 108.1% |
| 4 Mar 2024, 11:48 | 93.2 | 93.2% |
| 7 Feb 2024, 12:38 | 93.3 | 93.3% |
| 3 Jan 2024, 12:11 | 91.9 | 91.9% |
| 11 Dec 2023, 10:49 | 92.7 | 92.7% |
| 13 Nov 2023, 14:47 | 91 | 91% |
| 25 Oct 2023, 12:59 | 90.1 | 90.1% |
| 19 Oct 2023, 10:24 | 92.4 | 92.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.46 mg/l
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | 8.46 | 8.46 mg/l |
| 3 Aug 2026, 12:22 | 10.6 | 10.6 mg/l |
| 17 Jul 2026, 13:53 | 11.1 | 11.1 mg/l |
| 4 Jun 2026, 12:08 | 9.78 | 9.78 mg/l |
| 12 May 2026, 09:44 | 10.3 | 10.3 mg/l |
| 7 Apr 2026, 10:47 | 10.9 | 10.9 mg/l |
| 9 Dec 2024, 15:36 | 11.9 | 11.9 mg/l |
| 5 Nov 2024, 11:07 | 10.2 | 10.2 mg/l |
| 14 Oct 2024, 12:46 | 9.86 | 9.86 mg/l |
| 11 Sep 2024, 12:45 | 9.67 | 9.67 mg/l |
| 8 Aug 2024, 10:23 | 8.97 | 8.97 mg/l |
| 9 Jul 2024, 10:39 | 9.48 | 9.48 mg/l |
| 5 Jun 2024, 12:54 | 10.8 | 10.8 mg/l |
| 4 Mar 2024, 11:48 | 11.3 | 11.3 mg/l |
| 7 Feb 2024, 12:38 | 10.5 | 10.5 mg/l |
| 3 Jan 2024, 12:11 | 10.5 | 10.5 mg/l |
| 11 Dec 2023, 10:49 | 10.6 | 10.6 mg/l |
| 13 Nov 2023, 14:47 | 9.81 | 9.81 mg/l |
| 25 Oct 2023, 12:59 | 9.78 | 9.78 mg/l |
| 19 Oct 2023, 10:24 | 9.65 | 9.65 mg/l |
Water temperature
code 0076 · °C
16.9 °C
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | 16.9 | 16.9 °C |
| 3 Aug 2026, 12:22 | 17.8 | 17.8 °C |
| 17 Jul 2026, 13:53 | 22.4 | 22.4 °C |
| 4 Jun 2026, 12:08 | 14.9 | 14.9 °C |
| 12 May 2026, 09:44 | 11.1 | 11.1 °C |
| 7 Apr 2026, 10:47 | 11.1 | 11.1 °C |
| 9 Dec 2024, 15:36 | 7.5 | 7.5 °C |
| 5 Nov 2024, 11:07 | 11.6 | 11.6 °C |
| 14 Oct 2024, 12:46 | 11.7 | 11.7 °C |
| 11 Sep 2024, 12:45 | 13.6 | 13.6 °C |
| 8 Aug 2024, 10:23 | 17.1 | 17.1 °C |
| 9 Jul 2024, 10:39 | 14.5 | 14.5 °C |
| 5 Jun 2024, 12:54 | 15.5 | 15.5 °C |
| 4 Mar 2024, 11:48 | 7 | 7 °C |
| 7 Feb 2024, 12:38 | 9.9 | 9.9 °C |
| 3 Jan 2024, 12:11 | 9.4 | 9.4 °C |
| 11 Dec 2023, 10:49 | 9.5 | 9.5 °C |
| 13 Nov 2023, 14:47 | 11.9 | 11.9 °C |
| 25 Oct 2023, 12:59 | 11.6 | 11.6 °C |
| 19 Oct 2023, 10:24 | 13.3 | 13.3 °C |
pH
code 0061
7.35
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | 7.35 | 7.35 |
| 3 Aug 2026, 12:22 | 8.44 | 8.44 |
| 17 Jul 2026, 13:53 | 8.65 | 8.65 |
| 4 Jun 2026, 12:08 | 7.61 | 7.61 |
| 12 May 2026, 09:44 | 7.67 | 7.67 |
| 7 Apr 2026, 10:47 | 7.72 | 7.72 |
| 9 Dec 2024, 15:36 | 7.4 | 7.4 |
| 5 Nov 2024, 11:07 | 7.47 | 7.47 |
| 14 Oct 2024, 12:46 | 7.18 | 7.18 |
| 11 Sep 2024, 12:45 | 7.48 | 7.48 |
| 8 Aug 2024, 10:23 | 7.57 | 7.57 |
| 9 Jul 2024, 10:39 | 7.41 | 7.41 |
| 5 Jun 2024, 12:54 | 7.92 | 7.92 |
| 4 Mar 2024, 11:48 | 7.26 | 7.26 |
| 7 Feb 2024, 12:38 | 7.32 | 7.32 |
| 3 Jan 2024, 12:11 | 7.19 | 7.19 |
| 11 Dec 2023, 10:49 | 7.18 | 7.18 |
| 13 Nov 2023, 14:47 | 7.23 | 7.23 |
| 25 Oct 2023, 12:59 | 7.23 | 7.23 |
| 19 Oct 2023, 10:24 | 7.13 | 7.13 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Aug 2026, 12:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2026, 13:53 | 0.059 | 0.059 mg/l |
| 4 Jun 2026, 12:08 | 0.051 | 0.051 mg/l |
| 12 May 2026, 09:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Apr 2026, 10:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Dec 2024, 15:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Nov 2024, 11:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2024, 12:46 | 0.048 | 0.048 mg/l |
| 11 Sep 2024, 12:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Aug 2024, 10:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2024, 10:39 | 0.079 | 0.079 mg/l |
| 5 Jun 2024, 12:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2024, 11:48 | 0.075 | 0.075 mg/l |
| 7 Feb 2024, 12:38 | 0.084 | 0.084 mg/l |
| 3 Jan 2024, 12:11 | 0.07 | 0.07 mg/l |
| 11 Dec 2023, 10:49 | 0.039 | 0.039 mg/l |
| 13 Nov 2023, 14:47 | 0.12 | 0.12 mg/l |
| 25 Oct 2023, 12:59 | 0.22 | 0.22 mg/l |
| 19 Oct 2023, 10:24 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.89 mg/l
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | 1.89 | 1.89 mg/l |
| 3 Aug 2026, 12:22 | <0.196 | below 0.196 mg/l (not detected above this) |
| 17 Jul 2026, 13:53 | 0.336 | 0.336 mg/l |
| 4 Jun 2026, 12:08 | 0.904 | 0.904 mg/l |
| 12 May 2026, 09:44 | 0.626 | 0.626 mg/l |
| 7 Apr 2026, 10:47 | 1.3 | 1.3 mg/l |
| 9 Dec 2024, 15:36 | 2.79 | 2.79 mg/l |
| 5 Nov 2024, 11:07 | 1.8 | 1.8 mg/l |
| 14 Oct 2024, 12:46 | 1.09 | 1.09 mg/l |
| 11 Sep 2024, 12:45 | 1.49 | 1.49 mg/l |
| 8 Aug 2024, 10:23 | 0.996 | 0.996 mg/l |
| 9 Jul 2024, 10:39 | 1.79 | 1.79 mg/l |
| 5 Jun 2024, 12:54 | 1.19 | 1.19 mg/l |
| 4 Mar 2024, 11:48 | 2.28 | 2.28 mg/l |
| 7 Feb 2024, 12:38 | 1.19 | 1.19 mg/l |
| 3 Jan 2024, 12:11 | 1.88 | 1.88 mg/l |
| 11 Dec 2023, 10:49 | 2.48 | 2.48 mg/l |
| 13 Nov 2023, 14:47 | 1.39 | 1.39 mg/l |
| 25 Oct 2023, 12:59 | 1.79 | 1.79 mg/l |
| 19 Oct 2023, 10:24 | 2.59 | 2.59 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.05 mg/l
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | 0.05 | 0.05 mg/l |
| 3 Aug 2026, 12:22 | 0.017 | 0.017 mg/l |
| 17 Jul 2026, 13:53 | 0.032 | 0.032 mg/l |
| 4 Jun 2026, 12:08 | 0.041 | 0.041 mg/l |
| 12 May 2026, 09:44 | 0.041 | 0.041 mg/l |
| 7 Apr 2026, 10:47 | 0.028 | 0.028 mg/l |
| 9 Dec 2024, 15:36 | 0.034 | 0.034 mg/l |
| 5 Nov 2024, 11:07 | 0.033 | 0.033 mg/l |
| 14 Oct 2024, 12:46 | 0.064 | 0.064 mg/l |
| 11 Sep 2024, 12:45 | 0.067 | 0.067 mg/l |
| 8 Aug 2024, 10:23 | 0.045 | 0.045 mg/l |
| 9 Jul 2024, 10:39 | 0.075 | 0.075 mg/l |
| 5 Jun 2024, 12:54 | 0.044 | 0.044 mg/l |
| 4 Mar 2024, 11:48 | 0.046 | 0.046 mg/l |
| 7 Feb 2024, 12:38 | 0.063 | 0.063 mg/l |
| 3 Jan 2024, 12:11 | 0.049 | 0.049 mg/l |
| 11 Dec 2023, 10:49 | 0.043 | 0.043 mg/l |
| 13 Nov 2023, 14:47 | 0.055 | 0.055 mg/l |
| 25 Oct 2023, 12:59 | 0.061 | 0.061 mg/l |
| 19 Oct 2023, 10:24 | 0.022 | 0.022 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
249 µS/cm
Sampled 15 Sep 2026, 16 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 09:55 | 249 | 249 µS/cm |
| 3 Aug 2026, 12:22 | 244 | 244 µS/cm |
| 17 Jul 2026, 13:53 | 244 | 244 µS/cm |
| 4 Jun 2026, 12:08 | 216 | 216 µS/cm |
| 12 May 2026, 09:44 | 228 | 228 µS/cm |
| 7 Apr 2026, 10:47 | 183 | 183 µS/cm |
| 9 Dec 2024, 15:36 | 200 | 200 µS/cm |
| 5 Nov 2024, 11:07 | 194 | 194 µS/cm |
| 14 Oct 2024, 12:46 | 152 | 152 µS/cm |
| 11 Sep 2024, 12:45 | 195 | 195 µS/cm |
| 8 Aug 2024, 10:23 | 215 | 215 µS/cm |
| 9 Jul 2024, 10:39 | 200 | 200 µS/cm |
| 5 Jun 2024, 12:54 | 219 | 219 µS/cm |
| 4 Mar 2024, 11:48 | 174 | 174 µS/cm |
| 7 Feb 2024, 12:38 | 132 | 132 µS/cm |
| 3 Jan 2024, 12:11 | 176 | 176 µS/cm |
| 11 Dec 2023, 10:49 | 182 | 182 µS/cm |
| 13 Nov 2023, 14:47 | 168 | 168 µS/cm |
| 25 Oct 2023, 12:59 | 208 | 208 µS/cm |
| 19 Oct 2023, 10:24 | 203 | 203 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 20 | Oct 2023 – Sep 2026 | 87.6% 15 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Oct 2023 – Sep 2026 | 8.46 mg/l 15 Sep 2026 |
| Temperature of Water 0076 | River water | 20 | Oct 2023 – Sep 2026 | 16.9 °C 15 Sep 2026 |
| pH 0061 | River water | 20 | Oct 2023 – Sep 2026 | 7.35 15 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Oct 2023 – Sep 2026 | below 0.03 mg/l 15 Sep 2026 |
| Nitrate as N 0117 | River water | 20 | Oct 2023 – Sep 2026 | 1.89 mg/l 15 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Oct 2023 – Sep 2026 | 0.05 mg/l 15 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Oct 2023 – Sep 2026 | 249 µS/cm 15 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 19 | Oct 2023 – Sep 2026 | 37 mg/l 15 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Oct 2023 – Sep 2026 | below 0.00021 mg/l 15 Sep 2026 |
| Nitrite as N 0118 | River water | 20 | Oct 2023 – Sep 2026 | 0.008 mg/l 15 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Oct 2023 – Sep 2026 | 1.9 mg/l 15 Sep 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.