Downstream of Bridge Iver Lane
EA name: RSN2514 D/S BRIDGE IVER LANE
Environment Agency sampling point TH-RSN2514 · 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
- 5 Dec 2025, 12:5211 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 24 Oct 2026 and had nothing newer.
- Samples banked
- 12 since 24 Jan 2025 Imported periods: 1 Oct 2023 – 24 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 504906, 182149As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- River ColnePlaced by position alone (the only river line close by), 0 m from the line.
- Next gauge downstream
- Thorney Mill Road, West Drayton (Temporary) On the River Colne · 3.8 km along the riverWest Drayton On the River Colne · 3.8 km along the river
- Nearest gauge upstream
- Iver, Clisbys Bridge On the River Colne · 0.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (12 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
96.5%
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 96.5 | 96.5% |
| 5 Nov 2025, 09:53 | 84.1 | 84.1% |
| 15 Oct 2025, 10:14 | 91.4 | 91.4% |
| 24 Sep 2025, 10:49 | 97.4 | 97.4% |
| 1 Aug 2025, 11:26 | 96 | 96% |
| 22 Jul 2025, 11:55 | 94 | 94% |
| 11 Jun 2025, 09:38 | 81.4 | 81.4% |
| 22 May 2025, 09:28 | 91.8 | 91.8% |
| 2 Apr 2025, 12:41 | 99.3 | 99.3% |
| 18 Mar 2025, 12:07 | 98 | 98% |
| 17 Feb 2025, 10:37 | 96.8 | 96.8% |
| 24 Jan 2025, 11:29 | 91.7 | 91.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.9 mg/l
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 10.9 | 10.9 mg/l |
| 5 Nov 2025, 09:53 | 8.55 | 8.55 mg/l |
| 15 Oct 2025, 10:14 | 9.41 | 9.41 mg/l |
| 24 Sep 2025, 10:49 | 9.98 | 9.98 mg/l |
| 1 Aug 2025, 11:26 | 9.04 | 9.04 mg/l |
| 22 Jul 2025, 11:55 | 8.69 | 8.69 mg/l |
| 11 Jun 2025, 09:38 | 8.06 | 8.06 mg/l |
| 22 May 2025, 09:28 | 9.47 | 9.47 mg/l |
| 2 Apr 2025, 12:41 | 10.8 | 10.8 mg/l |
| 18 Mar 2025, 12:07 | 11.4 | 11.4 mg/l |
| 17 Feb 2025, 10:37 | 11.9 | 11.9 mg/l |
| 24 Jan 2025, 11:29 | 10.9 | 10.9 mg/l |
Water temperature
code 0076 · °C
9.8 °C
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 9.8 | 9.8 °C |
| 5 Nov 2025, 09:53 | 14.5 | 14.5 °C |
| 15 Oct 2025, 10:14 | 13.9 | 13.9 °C |
| 24 Sep 2025, 10:49 | 14.1 | 14.1 °C |
| 1 Aug 2025, 11:26 | 18.1 | 18.1 °C |
| 22 Jul 2025, 11:55 | 19 | 19 °C |
| 11 Jun 2025, 09:38 | 15.7 | 15.7 °C |
| 22 May 2025, 09:28 | 13.8 | 13.8 °C |
| 2 Apr 2025, 12:41 | 11.6 | 11.6 °C |
| 18 Mar 2025, 12:07 | 8.5 | 8.5 °C |
| 17 Feb 2025, 10:37 | 6.4 | 6.4 °C |
| 24 Jan 2025, 11:29 | 7.9 | 7.9 °C |
pH
code 0061
7.89
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 7.89 | 7.89 |
| 5 Nov 2025, 09:53 | 8.06 | 8.06 |
| 15 Oct 2025, 10:14 | 7.84 | 7.84 |
| 24 Sep 2025, 10:49 | 7.92 | 7.92 |
| 1 Aug 2025, 11:26 | 8.06 | 8.06 |
| 22 Jul 2025, 11:55 | 7.99 | 7.99 |
| 11 Jun 2025, 09:38 | 8.04 | 8.04 |
| 22 May 2025, 09:28 | 7.99 | 7.99 |
| 2 Apr 2025, 12:41 | 8.11 | 8.11 |
| 18 Mar 2025, 12:07 | 8.06 | 8.06 |
| 17 Feb 2025, 10:37 | 7.97 | 7.97 |
| 24 Jan 2025, 11:29 | 7.86 | 7.86 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.1 mg/l
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 0.1 | 0.1 mg/l |
| 5 Nov 2025, 09:53 | 0.047 | 0.047 mg/l |
| 15 Oct 2025, 10:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Sep 2025, 10:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2025, 11:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jul 2025, 11:55 | 0.035 | 0.035 mg/l |
| 11 Jun 2025, 09:38 | 0.036 | 0.036 mg/l |
| 22 May 2025, 09:28 | 0.037 | 0.037 mg/l |
| 2 Apr 2025, 12:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2025, 12:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2025, 10:37 | 0.11 | 0.11 mg/l |
| 24 Jan 2025, 11:29 | 0.28 | 0.28 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
11.9 mg/l
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 11.9 | 11.9 mg/l |
| 5 Nov 2025, 09:53 | 9.98 | 9.98 mg/l |
| 15 Oct 2025, 10:14 | 14 | 14 mg/l |
| 24 Sep 2025, 10:49 | 15 | 15 mg/l |
| 1 Aug 2025, 11:26 | 14 | 14 mg/l |
| 22 Jul 2025, 11:55 | 9.38 | 9.38 mg/l |
| 11 Jun 2025, 09:38 | 8.87 | 8.87 mg/l |
| 22 May 2025, 09:28 | 9.56 | 9.56 mg/l |
| 2 Apr 2025, 12:41 | 9.27 | 9.27 mg/l |
| 18 Mar 2025, 12:07 | 9.37 | 9.37 mg/l |
| 17 Feb 2025, 10:37 | 8.15 | 8.15 mg/l |
| 24 Jan 2025, 11:29 | 8.47 | 8.47 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.34 mg/l
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 0.34 | 0.34 mg/l |
| 5 Nov 2025, 09:53 | 0.32 | 0.32 mg/l |
| 15 Oct 2025, 10:14 | 0.32 | 0.32 mg/l |
| 24 Sep 2025, 10:49 | 0.2 | 0.2 mg/l |
| 1 Aug 2025, 11:26 | 0.33 | 0.33 mg/l |
| 22 Jul 2025, 11:55 | 0.31 | 0.31 mg/l |
| 11 Jun 2025, 09:38 | 0.21 | 0.21 mg/l |
| 22 May 2025, 09:28 | 0.19 | 0.19 mg/l |
| 2 Apr 2025, 12:41 | 0.063 | 0.063 mg/l |
| 18 Mar 2025, 12:07 | 0.088 | 0.088 mg/l |
| 17 Feb 2025, 10:37 | 0.17 | 0.17 mg/l |
| 24 Jan 2025, 11:29 | 0.31 | 0.31 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
867 µS/cm
Sampled 5 Dec 2025, 11 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Dec 2025, 12:52 | 867 | 867 µS/cm |
| 5 Nov 2025, 09:53 | 953 | 953 µS/cm |
| 15 Oct 2025, 10:14 | 889 | 889 µS/cm |
| 24 Sep 2025, 10:49 | 878 | 878 µS/cm |
| 1 Aug 2025, 11:26 | 818 | 818 µS/cm |
| 22 Jul 2025, 11:55 | 734 | 734 µS/cm |
| 11 Jun 2025, 09:38 | 817 | 817 µS/cm |
| 22 May 2025, 09:28 | 937 | 937 µS/cm |
| 2 Apr 2025, 12:41 | 767 | 767 µS/cm |
| 18 Mar 2025, 12:07 | 781 | 781 µS/cm |
| 17 Feb 2025, 10:37 | 762 | 762 µS/cm |
| 24 Jan 2025, 11:29 | 778 | 778 µS/cm |
Everything measured here
19 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 19 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 12 | Jan 2025 – Dec 2025 | 96.5% 5 Dec 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 12 | Jan 2025 – Dec 2025 | 10.9 mg/l 5 Dec 2025 |
| Temperature of Water 0076 | River water | 12 | Jan 2025 – Dec 2025 | 9.8 °C 5 Dec 2025 |
| pH 0061 | River water | 12 | Jan 2025 – Dec 2025 | 7.89 5 Dec 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Jan 2025 – Dec 2025 | 0.1 mg/l 5 Dec 2025 |
| Nitrate as N 0117 | River water | 12 | Jan 2025 – Dec 2025 | 11.9 mg/l 5 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Jan 2025 – Dec 2025 | 0.34 mg/l 5 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 12 | Jan 2025 – Dec 2025 | 867 µS/cm 5 Dec 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Jan 2025 – Dec 2025 | 230 mg/l 5 Dec 2025 |
| Ammonia un-ionised as N 0119 | River water | 12 | Jan 2025 – Dec 2025 | 0.0014 mg/l 5 Dec 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 12 | Jan 2025 – Dec 2025 | 3.7 mg/l 5 Dec 2025 |
| Chloride 0172 | River water | 12 | Jan 2025 – Dec 2025 | 73 mg/l 5 Dec 2025 |
| Flow Type 2896 | River water | 11 | Jan 2025 – Dec 2025 | Moderate Flow 5 Dec 2025 |
| Nitrite as N 0118 | River water | 12 | Jan 2025 – Dec 2025 | 0.059 mg/l 5 Dec 2025 |
| Nitrogen, Total as N 9686 | River water | 12 | Jan 2025 – Dec 2025 | 13 mg/l 5 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Jan 2025 – Dec 2025 | 12 mg/l 5 Dec 2025 |
| Phosphorus, Total as P 0348 | River water | 12 | Jan 2025 – Dec 2025 | 0.38 mg/l 5 Dec 2025 |
| Silica, reactive as SiO2 0182 | River water | 12 | Jan 2025 – Dec 2025 | 15 mg/l 5 Dec 2025 |
| Solids, Suspended at 105 C 0135 | River water | 1 | Dec 2025 – Dec 2025 | 7.5 mg/l 5 Dec 2025 |
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.