River Wensum Dolphin Concrete Bridge
EA name: R.WENSUM DOLPHIN CONCRETE BRIDGE
Environment Agency sampling point AN-WEN256A · 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
- 2 Mar 2026, 14:337 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 11 Jun 2024 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 622100, 309900As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Wensum
- River, by the map
- River WensumPlaced on the river its name gives, 11 m from the line.
- Next gauge downstream
- Brundall On the River Yare · 18 km along the river
- Nearest gauge upstream
- Costessey Mill On the River Wensum · 8.2 km along the riverCOSTESSEY MILL SLUICE 8.2 km along the riverCOSTESSEY MILL SLUICE 8.2 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (17 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.2%
Sampled 2 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | 98.2 | 98.2% |
| 4 Feb 2026, 14:10 | 97.2 | 97.2% |
| 7 Jan 2026, 13:54 | 94 | 94% |
| 5 Dec 2025, 11:42 | 88.4 | 88.4% |
| 3 Nov 2025, 12:52 | 89.5 | 89.5% |
| 13 Oct 2025, 11:03 | 79.1 | 79.1% |
| 3 Apr 2025, 10:57 | 96.9 | 96.9% |
| 4 Mar 2025, 12:45 | 96.2 | 96.2% |
| 5 Feb 2025, 14:28 | 95.5 | 95.5% |
| 7 Jan 2025, 13:52 | 96.1 | 96.1% |
| 2 Dec 2024, 14:15 | 94.3 | 94.3% |
| 1 Nov 2024, 12:41 | 88.4 | 88.4% |
| 1 Oct 2024, 13:53 | 87.2 | 87.2% |
| 2 Sep 2024, 10:24 | 78.9 | 78.9% |
| 5 Aug 2024, 10:06 | 86.9 | 86.9% |
| 1 Jul 2024, 11:02 | 90.5 | 90.5% |
| 11 Jun 2024, 10:13 | 91.7 | 91.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.1 mg/l
Sampled 2 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | 11.1 | 11.1 mg/l |
| 4 Feb 2026, 14:10 | 11.8 | 11.8 mg/l |
| 7 Jan 2026, 13:54 | 13 | 13 mg/l |
| 5 Dec 2025, 11:42 | 11 | 11 mg/l |
| 3 Nov 2025, 12:52 | 9.89 | 9.89 mg/l |
| 13 Oct 2025, 11:03 | 8.41 | 8.41 mg/l |
| 3 Apr 2025, 10:57 | 10.7 | 10.7 mg/l |
| 4 Mar 2025, 12:45 | 11.8 | 11.8 mg/l |
| 5 Feb 2025, 14:28 | 11.9 | 11.9 mg/l |
| 7 Jan 2025, 13:52 | 12 | 12 mg/l |
| 2 Dec 2024, 14:15 | 11.1 | 11.1 mg/l |
| 1 Nov 2024, 12:41 | 9.71 | 9.71 mg/l |
| 1 Oct 2024, 13:53 | 9.19 | 9.19 mg/l |
| 2 Sep 2024, 10:24 | 7.39 | 7.39 mg/l |
| 5 Aug 2024, 10:06 | 8.14 | 8.14 mg/l |
| 1 Jul 2024, 11:02 | 8.6 | 8.6 mg/l |
| 11 Jun 2024, 10:13 | 9.68 | 9.68 mg/l |
Water temperature
code 0076 · °C
10 °C
Sampled 2 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | 10 | 10 °C |
| 4 Feb 2026, 14:10 | 6.9 | 6.9 °C |
| 7 Jan 2026, 13:54 | 1.9 | 1.9 °C |
| 5 Dec 2025, 11:42 | 6 | 6 °C |
| 3 Nov 2025, 12:52 | 10.8 | 10.8 °C |
| 13 Oct 2025, 11:03 | 12.5 | 12.5 °C |
| 3 Apr 2025, 10:57 | 11 | 11 °C |
| 4 Mar 2025, 12:45 | 6.5 | 6.5 °C |
| 5 Feb 2025, 14:28 | 5.9 | 5.9 °C |
| 7 Jan 2025, 13:52 | 5.7 | 5.7 °C |
| 2 Dec 2024, 14:15 | 8.1 | 8.1 °C |
| 1 Nov 2024, 12:41 | 11.1 | 11.1 °C |
| 1 Oct 2024, 13:53 | 12.9 | 12.9 °C |
| 2 Sep 2024, 10:24 | 18.4 | 18.4 °C |
| 5 Aug 2024, 10:06 | 18.4 | 18.4 °C |
| 1 Jul 2024, 11:02 | 17.7 | 17.7 °C |
| 11 Jun 2024, 10:13 | 12.8 | 12.8 °C |
pH
code 0061
8.18
Sampled 2 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | 8.18 | 8.18 |
| 4 Feb 2026, 14:10 | 8.19 | 8.19 |
| 7 Jan 2026, 13:54 | 8.04 | 8.04 |
| 5 Dec 2025, 11:42 | 7.85 | 7.85 |
| 3 Nov 2025, 12:52 | 7.98 | 7.98 |
| 13 Oct 2025, 11:03 | 7.92 | 7.92 |
| 3 Apr 2025, 10:57 | 8.16 | 8.16 |
| 4 Mar 2025, 12:45 | 8.2 | 8.2 |
| 5 Feb 2025, 14:28 | 8.17 | 8.17 |
| 7 Jan 2025, 13:52 | 8.07 | 8.07 |
| 2 Dec 2024, 14:15 | 7.94 | 7.94 |
| 1 Nov 2024, 12:41 | 7.95 | 7.95 |
| 1 Oct 2024, 13:53 | 7.93 | 7.93 |
| 2 Sep 2024, 10:24 | 7.82 | 7.82 |
| 5 Aug 2024, 10:06 | 7.93 | 7.93 |
| 1 Jul 2024, 11:02 | 8.25 | 8.25 |
| 11 Jun 2024, 10:13 | 8.05 | 8.05 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 2 Mar 2026, 7 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2026, 14:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2026, 13:54 | 0.14 | 0.14 mg/l |
| 5 Dec 2025, 11:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 12:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Oct 2025, 11:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2025, 12:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2025, 14:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2025, 13:52 | 0.044 | 0.044 mg/l |
| 2 Dec 2024, 14:15 | 0.035 | 0.035 mg/l |
| 1 Nov 2024, 12:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Oct 2024, 13:53 | 0.036 | 0.036 mg/l |
| 2 Sep 2024, 10:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Aug 2024, 10:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2024, 11:02 | 0.043 | 0.043 mg/l |
| 11 Jun 2024, 10:13 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.09 mg/l
Sampled 2 Mar 2026, 7 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | 6.09 | 6.09 mg/l |
| 4 Feb 2026, 14:10 | 6.88 | 6.88 mg/l |
| 7 Jan 2026, 13:54 | 6.96 | 6.96 mg/l |
| 5 Dec 2025, 11:42 | 6.88 | 6.88 mg/l |
| 3 Nov 2025, 12:52 | 5.49 | 5.49 mg/l |
| 13 Oct 2025, 11:03 | 5.29 | 5.29 mg/l |
| 4 Mar 2025, 12:45 | 6.69 | 6.69 mg/l |
| 5 Feb 2025, 14:28 | 7.18 | 7.18 mg/l |
| 7 Jan 2025, 13:52 | 6.67 | 6.67 mg/l |
| 2 Dec 2024, 14:15 | 6.17 | 6.17 mg/l |
| 1 Nov 2024, 12:41 | 6.29 | 6.29 mg/l |
| 1 Oct 2024, 13:53 | 4.69 | 4.69 mg/l |
| 2 Sep 2024, 10:24 | 4.66 | 4.66 mg/l |
| 5 Aug 2024, 10:06 | 5.18 | 5.18 mg/l |
| 1 Jul 2024, 11:02 | 5.39 | 5.39 mg/l |
| 11 Jun 2024, 10:13 | 5.18 | 5.18 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.051 mg/l
Sampled 2 Mar 2026, 7 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | 0.051 | 0.051 mg/l |
| 4 Feb 2026, 14:10 | 0.055 | 0.055 mg/l |
| 7 Jan 2026, 13:54 | 0.058 | 0.058 mg/l |
| 5 Dec 2025, 11:42 | 0.058 | 0.058 mg/l |
| 3 Nov 2025, 12:52 | 0.072 | 0.072 mg/l |
| 13 Oct 2025, 11:03 | 0.072 | 0.072 mg/l |
| 4 Mar 2025, 12:45 | 0.035 | 0.035 mg/l |
| 5 Feb 2025, 14:28 | 0.05 | 0.05 mg/l |
| 7 Jan 2025, 13:52 | 0.066 | 0.066 mg/l |
| 2 Dec 2024, 14:15 | 0.054 | 0.054 mg/l |
| 1 Nov 2024, 12:41 | 0.062 | 0.062 mg/l |
| 1 Oct 2024, 13:53 | 0.066 | 0.066 mg/l |
| 2 Sep 2024, 10:24 | 0.026 | 0.026 mg/l |
| 5 Aug 2024, 10:06 | 0.061 | 0.061 mg/l |
| 1 Jul 2024, 11:02 | 0.051 | 0.051 mg/l |
| 11 Jun 2024, 10:13 | 0.053 | 0.053 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
725 µS/cm
Sampled 2 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 14:33 | 725 | 725 µS/cm |
| 4 Feb 2026, 14:10 | 776 | 776 µS/cm |
| 7 Jan 2026, 13:54 | 985 | 985 µS/cm |
| 5 Dec 2025, 11:42 | 776 | 776 µS/cm |
| 3 Nov 2025, 12:52 | 786 | 786 µS/cm |
| 13 Oct 2025, 11:03 | 780 | 780 µS/cm |
| 3 Apr 2025, 10:57 | 731 | 731 µS/cm |
| 4 Mar 2025, 12:45 | 769 | 769 µS/cm |
| 5 Feb 2025, 14:28 | 735 | 735 µS/cm |
| 7 Jan 2025, 13:52 | 755 | 755 µS/cm |
| 2 Dec 2024, 14:15 | 734 | 734 µS/cm |
| 1 Nov 2024, 12:41 | 766 | 766 µS/cm |
| 1 Oct 2024, 13:53 | 765 | 765 µS/cm |
| 2 Sep 2024, 10:24 | 752 | 752 µS/cm |
| 5 Aug 2024, 10:06 | 748 | 748 µS/cm |
| 1 Jul 2024, 11:02 | 787 | 787 µS/cm |
| 11 Jun 2024, 10:13 | 728 | 728 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 | 17 | Jun 2024 – Mar 2026 | 98.2% 2 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 17 | Jun 2024 – Mar 2026 | 11.1 mg/l 2 Mar 2026 |
| Temperature of Water 0076 | River water | 17 | Jun 2024 – Mar 2026 | 10 °C 2 Mar 2026 |
| pH 0061 | River water | 17 | Jun 2024 – Mar 2026 | 8.18 2 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 16 | Jun 2024 – Mar 2026 | below 0.03 mg/l 2 Mar 2026 |
| Nitrate as N 0117 | River water | 16 | Jun 2024 – Mar 2026 | 6.09 mg/l 2 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 16 | Jun 2024 – Mar 2026 | 0.051 mg/l 2 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 17 | Jun 2024 – Mar 2026 | 725 µS/cm 2 Mar 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 16 | Jun 2024 – Mar 2026 | 260 mg/l 2 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 16 | Jun 2024 – Mar 2026 | below 0.00055 mg/l 2 Mar 2026 |
| Nitrite as N 0118 | River water | 16 | Jun 2024 – Mar 2026 | 0.01 mg/l 2 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 16 | Jun 2024 – Mar 2026 | 6.1 mg/l 2 Mar 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.