River Cam Dernford Lock Gauging Station
EA name: R.CAM DERNFORD LOCK GAUGING STATION
Environment Agency sampling point AN-27M10 · 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 Dec 2025, 10:1510 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 30 Sep 2026 and had nothing newer.
- Samples banked
- 22 since 16 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 546700, 250600As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Cam
- River, by the map
- River CamPlaced on the river its name gives, 36 m from the line.
- Next gauge downstream
- Cambridge Jesus Lock On the River Cam · 15 km along the river (the path rests on a repair to the map)Beside Dernford: too close to say above or below.
- Nearest gauge upstream
- Great Chesterford On the River Cam · 13 km along the river
- Why it was sampled
- Monitoring (national agency policy) (22 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
86.6%
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | 86.6 | 86.6% |
| 4 Dec 2025, 09:57 | 87.6 | 87.6% |
| 17 Nov 2025, 11:07 | 87.2 | 87.2% |
| 6 Nov 2025, 10:00 | 80.6 | 80.6% |
| 7 Mar 2025, 10:53 | 106.8 | 106.8% |
| 5 Feb 2025, 12:15 | 101.5 | 101.5% |
| 21 Jan 2025, 11:25 | 96.7 | 96.7% |
| 5 Dec 2024, 11:05 | 89.1 | 89.1% |
| 19 Nov 2024, 09:53 | 96.7 | 96.7% |
| 14 Oct 2024, 10:01 | 92.8 | 92.8% |
| 17 Sep 2024, 09:29 | 83.9 | 83.9% |
| 19 Aug 2024, 11:07 | 99 | 99% |
| 15 Jul 2024, 09:38 | 96.9 | 96.9% |
| 18 Jun 2024, 08:57 | 95.1 | 95.1% |
| 9 May 2024, 13:29 | 140.3 | 140.3% |
| 15 Apr 2024, 11:27 | 108.7 | 108.7% |
| 20 Mar 2024, 09:15 | 92.3 | 92.3% |
| 20 Feb 2024, 09:15 | 76.8 | 76.8% |
| 15 Jan 2024, 10:32 | 93.7 | 93.7% |
| 7 Dec 2023, 09:53 | 65.8 | 65.8% |
| 20 Nov 2023, 11:17 | 91.2 | 91.2% |
| 16 Oct 2023, 10:33 | 84.7 | 84.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.1 mg/l
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | 10.1 | 10.1 mg/l |
| 4 Dec 2025, 09:57 | 10.4 | 10.4 mg/l |
| 17 Nov 2025, 11:07 | 10 | 10 mg/l |
| 6 Nov 2025, 10:00 | 8.61 | 8.61 mg/l |
| 7 Mar 2025, 10:53 | 12.2 | 12.2 mg/l |
| 5 Feb 2025, 12:15 | 12.1 | 12.1 mg/l |
| 21 Jan 2025, 11:25 | 12 | 12 mg/l |
| 5 Dec 2024, 11:05 | 10.2 | 10.2 mg/l |
| 19 Nov 2024, 09:53 | 11.5 | 11.5 mg/l |
| 14 Oct 2024, 10:01 | 10.5 | 10.5 mg/l |
| 17 Sep 2024, 09:29 | 9 | 9 mg/l |
| 19 Aug 2024, 11:07 | 9.87 | 9.87 mg/l |
| 15 Jul 2024, 09:38 | 9.85 | 9.85 mg/l |
| 18 Jun 2024, 08:57 | 9.75 | 9.75 mg/l |
| 9 May 2024, 13:29 | 14.1 | 14.1 mg/l |
| 15 Apr 2024, 11:27 | 12 | 12 mg/l |
| 20 Mar 2024, 09:15 | 10.1 | 10.1 mg/l |
| 20 Feb 2024, 09:15 | 8.91 | 8.91 mg/l |
| 15 Jan 2024, 10:32 | 11.6 | 11.6 mg/l |
| 7 Dec 2023, 09:53 | 7.67 | 7.67 mg/l |
| 20 Nov 2023, 11:17 | 10.2 | 10.2 mg/l |
| 16 Oct 2023, 10:33 | 9.73 | 9.73 mg/l |
Water temperature
code 0076 · °C
8.5 °C
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | 8.5 | 8.5 °C |
| 4 Dec 2025, 09:57 | 7.7 | 7.7 °C |
| 17 Nov 2025, 11:07 | 9.1 | 9.1 °C |
| 6 Nov 2025, 10:00 | 12.3 | 12.3 °C |
| 7 Mar 2025, 10:53 | 9.4 | 9.4 °C |
| 5 Feb 2025, 12:15 | 7.7 | 7.7 °C |
| 21 Jan 2025, 11:25 | 6.2 | 6.2 °C |
| 5 Dec 2024, 11:05 | 9.4 | 9.4 °C |
| 19 Nov 2024, 09:53 | 7.7 | 7.7 °C |
| 14 Oct 2024, 10:01 | 9.8 | 9.8 °C |
| 17 Sep 2024, 09:29 | 12.1 | 12.1 °C |
| 19 Aug 2024, 11:07 | 15.4 | 15.4 °C |
| 15 Jul 2024, 09:38 | 14.5 | 14.5 °C |
| 18 Jun 2024, 08:57 | 14.1 | 14.1 °C |
| 9 May 2024, 13:29 | 15.1 | 15.1 °C |
| 15 Apr 2024, 11:27 | 10.8 | 10.8 °C |
| 20 Mar 2024, 09:15 | 11.1 | 11.1 °C |
| 20 Feb 2024, 09:15 | 8.8 | 8.8 °C |
| 15 Jan 2024, 10:32 | 6 | 6 °C |
| 7 Dec 2023, 09:53 | 8.6 | 8.6 °C |
| 20 Nov 2023, 11:17 | 10.3 | 10.3 °C |
| 16 Oct 2023, 10:33 | 9.2 | 9.2 °C |
pH
code 0061
7.83
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | 7.83 | 7.83 |
| 4 Dec 2025, 09:57 | 7.82 | 7.82 |
| 17 Nov 2025, 11:07 | 7.91 | 7.91 |
| 6 Nov 2025, 10:00 | 7.82 | 7.82 |
| 7 Mar 2025, 10:53 | 8.07 | 8.07 |
| 5 Feb 2025, 12:15 | 8.09 | 8.09 |
| 21 Jan 2025, 11:25 | 8.07 | 8.07 |
| 5 Dec 2024, 11:05 | 7.99 | 7.99 |
| 19 Nov 2024, 09:53 | 8.04 | 8.04 |
| 14 Oct 2024, 10:01 | 7.98 | 7.98 |
| 17 Sep 2024, 09:29 | 8.02 | 8.02 |
| 19 Aug 2024, 11:07 | 8.1 | 8.1 |
| 15 Jul 2024, 09:38 | 8.14 | 8.14 |
| 18 Jun 2024, 08:57 | 8.08 | 8.08 |
| 9 May 2024, 13:29 | 8.31 | 8.31 |
| 15 Apr 2024, 11:27 | 8.16 | 8.16 |
| 20 Mar 2024, 09:15 | 7.86 | 7.86 |
| 20 Feb 2024, 09:15 | 8 | 8 |
| 15 Jan 2024, 10:32 | 8.04 | 8.04 |
| 7 Dec 2023, 09:53 | 7.76 | 7.76 |
| 20 Nov 2023, 11:17 | 8 | 8 |
| 16 Oct 2023, 10:33 | 7.85 | 7.85 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 15 Dec 2025, 10 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2025, 09:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Nov 2025, 11:07 | 0.034 | 0.034 mg/l |
| 6 Nov 2025, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Mar 2025, 10:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2025, 12:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jan 2025, 11:25 | 0.045 | 0.045 mg/l |
| 19 Nov 2024, 09:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2024, 10:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Sep 2024, 09:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2024, 11:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jun 2024, 08:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 May 2024, 13:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Apr 2024, 11:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Mar 2024, 09:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Feb 2024, 09:15 | 0.032 | 0.032 mg/l |
| 15 Jan 2024, 10:32 | 0.034 | 0.034 mg/l |
| 7 Dec 2023, 09:53 | 0.51 | 0.51 mg/l |
| 20 Nov 2023, 11:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2023, 10:33 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
11 mg/l
Sampled 15 Dec 2025, 10 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | 11 | 11 mg/l |
| 4 Dec 2025, 09:57 | 9.88 | 9.88 mg/l |
| 17 Nov 2025, 11:07 | 15 | 15 mg/l |
| 6 Nov 2025, 10:00 | 8.77 | 8.77 mg/l |
| 7 Mar 2025, 10:53 | 8.88 | 8.88 mg/l |
| 5 Feb 2025, 12:15 | 8.67 | 8.67 mg/l |
| 21 Jan 2025, 11:25 | 9.46 | 9.46 mg/l |
| 19 Nov 2024, 09:53 | 7.59 | 7.59 mg/l |
| 14 Oct 2024, 10:01 | 8.68 | 8.68 mg/l |
| 17 Sep 2024, 09:29 | 8.59 | 8.59 mg/l |
| 19 Aug 2024, 11:07 | 8.39 | 8.39 mg/l |
| 15 Jul 2024, 09:38 | 7.29 | 7.29 mg/l |
| 18 Jun 2024, 08:57 | 8.08 | 8.08 mg/l |
| 9 May 2024, 13:29 | 7.58 | 7.58 mg/l |
| 15 Apr 2024, 11:27 | 7.79 | 7.79 mg/l |
| 20 Mar 2024, 09:15 | 8.29 | 8.29 mg/l |
| 20 Feb 2024, 09:15 | 7.88 | 7.88 mg/l |
| 15 Jan 2024, 10:32 | 8.18 | 8.18 mg/l |
| 7 Dec 2023, 09:53 | 15.7 | 15.7 mg/l |
| 20 Nov 2023, 11:17 | 9.98 | 9.98 mg/l |
| 16 Oct 2023, 10:33 | 7.69 | 7.69 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.24 mg/l
Sampled 15 Dec 2025, 10 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | 0.24 | 0.24 mg/l |
| 4 Dec 2025, 09:57 | 0.32 | 0.32 mg/l |
| 17 Nov 2025, 11:07 | 0.23 | 0.23 mg/l |
| 6 Nov 2025, 10:00 | 0.31 | 0.31 mg/l |
| 7 Mar 2025, 10:53 | 0.11 | 0.11 mg/l |
| 5 Feb 2025, 12:15 | 0.11 | 0.11 mg/l |
| 21 Jan 2025, 11:25 | 0.13 | 0.13 mg/l |
| 19 Nov 2024, 09:53 | 0.19 | 0.19 mg/l |
| 14 Oct 2024, 10:01 | 0.14 | 0.14 mg/l |
| 17 Sep 2024, 09:29 | 0.23 | 0.23 mg/l |
| 19 Aug 2024, 11:07 | 0.19 | 0.19 mg/l |
| 15 Jul 2024, 09:38 | 0.15 | 0.15 mg/l |
| 18 Jun 2024, 08:57 | 0.12 | 0.12 mg/l |
| 9 May 2024, 13:29 | 0.086 | 0.086 mg/l |
| 15 Apr 2024, 11:27 | 0.058 | 0.058 mg/l |
| 20 Mar 2024, 09:15 | 0.091 | 0.091 mg/l |
| 20 Feb 2024, 09:15 | 0.098 | 0.098 mg/l |
| 15 Jan 2024, 10:32 | 0.12 | 0.12 mg/l |
| 7 Dec 2023, 09:53 | 0.3 | 0.3 mg/l |
| 20 Nov 2023, 11:17 | 0.13 | 0.13 mg/l |
| 16 Oct 2023, 10:33 | 0.26 | 0.26 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
834 µS/cm
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 10:15 | 834 | 834 µS/cm |
| 4 Dec 2025, 09:57 | 854 | 854 µS/cm |
| 17 Nov 2025, 11:07 | 791 | 791 µS/cm |
| 6 Nov 2025, 10:00 | 794 | 794 µS/cm |
| 7 Mar 2025, 10:53 | 784 | 784 µS/cm |
| 5 Feb 2025, 12:15 | 793 | 793 µS/cm |
| 21 Jan 2025, 11:25 | 778 | 778 µS/cm |
| 5 Dec 2024, 11:05 | 789 | 789 µS/cm |
| 19 Nov 2024, 09:53 | 768 | 768 µS/cm |
| 14 Oct 2024, 10:01 | 786 | 786 µS/cm |
| 17 Sep 2024, 09:29 | 784 | 784 µS/cm |
| 19 Aug 2024, 11:07 | 799 | 799 µS/cm |
| 15 Jul 2024, 09:38 | 785 | 785 µS/cm |
| 18 Jun 2024, 08:57 | 780 | 780 µS/cm |
| 9 May 2024, 13:29 | 754 | 754 µS/cm |
| 15 Apr 2024, 11:27 | 783 | 783 µS/cm |
| 20 Mar 2024, 09:15 | 796 | 796 µS/cm |
| 20 Feb 2024, 09:15 | 726 | 726 µS/cm |
| 15 Jan 2024, 10:32 | 814 | 814 µS/cm |
| 7 Dec 2023, 09:53 | 908 | 908 µS/cm |
| 20 Nov 2023, 11:17 | 743 | 743 µS/cm |
| 16 Oct 2023, 10:33 | 749 | 749 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 | 22 | Oct 2023 – Dec 2025 | 86.6% 15 Dec 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 22 | Oct 2023 – Dec 2025 | 10.1 mg/l 15 Dec 2025 |
| Temperature of Water 0076 | River water | 22 | Oct 2023 – Dec 2025 | 8.5 °C 15 Dec 2025 |
| pH 0061 | River water | 22 | Oct 2023 – Dec 2025 | 7.83 15 Dec 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 21 | Oct 2023 – Dec 2025 | below 0.03 mg/l 15 Dec 2025 |
| Nitrate as N 0117 | River water | 21 | Oct 2023 – Dec 2025 | 11 mg/l 15 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Oct 2023 – Dec 2025 | 0.24 mg/l 15 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 22 | Oct 2023 – Dec 2025 | 834 µS/cm 15 Dec 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 21 | Oct 2023 – Dec 2025 | 260 mg/l 15 Dec 2025 |
| Ammonia un-ionised as N 0119 | River water | 21 | Oct 2023 – Dec 2025 | below 0.00033 mg/l 15 Dec 2025 |
| BOD : 5 Day ATU 0085 | River water | 18 | Feb 2024 – Dec 2025 | 1.2 mg/l 15 Dec 2025 |
| Nitrite as N 0118 | River water | 21 | Oct 2023 – Dec 2025 | 0.012 mg/l 15 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Oct 2023 – Dec 2025 | 11 mg/l 15 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.