Tributary of Alconbury Brook Road Bridge Woolley Leys Farm

EA name: TRIB.ALCONBURY BK.RD.BR.WOOLLEY LEYS FM (also listed as “TRIB.ALCONBURY BK. RD.BR.WOOLLEY LEYS FM WOOLLEY”)
Environment Agency sampling point AN-23M08 · 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
11 Sep 2026, 15:4727 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
Samples banked
6 since 1 Apr 2026 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
Latest sample
River / running surface water Monitoring (national agency policy) · results completed 15 Sep 2026
Where
National Grid 517120, 274400As published, to the nearest 10 m. Open in a map
River, by its own name
Its name does not give one
River, by the map
An unnamed streamPlaced by position alone (the only river line close by), 2 m from the line.
Next gauge downstream
BRAMPTON RACECOURSE GS 7.2 km along the riverBrampton Racecourse On the Alconbury Brook · 7.2 km along the river
Why it was sampled
Monitoring (national agency policy) (6 samples)

Results here were completed a median of 2 days after the sample was taken (2 to 4 days, 3 samples). 2 visits found no water to sample (recorded as “No flow”).

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

33.5%

Sampled 11 Sep 2026, 27 days ago · 4 results banked

20406080100%2024202520261 Apr 2026, 09:56: 87.8%18 May 2026, 13:27: 84.8%1 Jun 2026, 10:39: 50.6%11 Sep 2026, 15:47: 33.5%
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:4733.5 33.5%
1 Jun 2026, 10:3950.6 50.6%
18 May 2026, 13:2784.8 84.8%
1 Apr 2026, 09:5687.8 87.8%

Dissolved oxygen

as O2 · code 9924 · mg/l

3.3 mg/l

Sampled 11 Sep 2026, 27 days ago · 4 results banked

246810mg/l2024202520261 Apr 2026, 09:56: 9.92 mg/l18 May 2026, 13:27: 9.16 mg/l1 Jun 2026, 10:39: 4.97 mg/l11 Sep 2026, 15:47: 3.3 mg/l
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:473.3 3.3 mg/l
1 Jun 2026, 10:394.97 4.97 mg/l
18 May 2026, 13:279.16 9.16 mg/l
1 Apr 2026, 09:569.92 9.92 mg/l

Water temperature

code 0076 · °C

16 °C

Sampled 11 Sep 2026, 27 days ago · 4 results banked

81012141618°C2024202520261 Apr 2026, 09:56: 9.9 °C18 May 2026, 13:27: 11.8 °C1 Jun 2026, 10:39: 16.1 °C11 Sep 2026, 15:47: 16 °C
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:4716 16 °C
1 Jun 2026, 10:3916.1 16.1 °C
18 May 2026, 13:2711.8 11.8 °C
1 Apr 2026, 09:569.9 9.9 °C

pH

code 0061

7.54

Sampled 11 Sep 2026, 27 days ago · 4 results banked

7.47.67.888.22024202520261 Apr 2026, 09:56: 8.118 May 2026, 13:27: 7.871 Jun 2026, 10:39: 7.6611 Sep 2026, 15:47: 7.54
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:477.54 7.54
1 Jun 2026, 10:397.66 7.66
18 May 2026, 13:277.87 7.87
1 Apr 2026, 09:568.1 8.1

Ammonia

ammoniacal nitrogen as N · code 0111 · mg/l

below 0.03 mg/l (not detected above this)

Sampled 11 Sep 2026, 27 days ago · 4 results banked

0.020.040.060.080.1mg/l2024202520261 Apr 2026, 09:56: below 0.03 mg/l (not detected above this)18 May 2026, 13:27: below 0.03 mg/l (not detected above this)1 Jun 2026, 10:39: 0.088 mg/l11 Sep 2026, 15:47: below 0.03 mg/l (not detected above this)
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:47<0.03 below 0.03 mg/l (not detected above this)
1 Jun 2026, 10:390.088 0.088 mg/l
18 May 2026, 13:27<0.03 below 0.03 mg/l (not detected above this)
1 Apr 2026, 09:56<0.03 below 0.03 mg/l (not detected above this)

Nitrate

as nitrogen (N) · code 0117 · mg/l

below 0.196 mg/l (not detected above this)

Sampled 11 Sep 2026, 27 days ago · 4 results banked

051015mg/l2024202520261 Apr 2026, 09:56: 11 mg/l18 May 2026, 13:27: 6.56 mg/l1 Jun 2026, 10:39: 1.08 mg/l11 Sep 2026, 15:47: below 0.196 mg/l (not detected above this)
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:47<0.196 below 0.196 mg/l (not detected above this)
1 Jun 2026, 10:391.08 1.08 mg/l
18 May 2026, 13:276.56 6.56 mg/l
1 Apr 2026, 09:5611 11 mg/l

Phosphate

orthophosphate, reactive, as P · code 0180 · mg/l

0.053 mg/l

Sampled 11 Sep 2026, 27 days ago · 4 results banked

00.020.040.060.080.1mg/l2024202520261 Apr 2026, 09:56: 0.025 mg/l18 May 2026, 13:27: below 0.01 mg/l (not detected above this)1 Jun 2026, 10:39: 0.087 mg/l11 Sep 2026, 15:47: 0.053 mg/l
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:470.053 0.053 mg/l
1 Jun 2026, 10:390.087 0.087 mg/l
18 May 2026, 13:27<0.01 below 0.01 mg/l (not detected above this)
1 Apr 2026, 09:560.025 0.025 mg/l

Conductivity

at 25 °C · code 0077 · µS/cm

1111 µS/cm

Sampled 11 Sep 2026, 27 days ago · 4 results banked

700800900100011001200µS/cm2024202520261 Apr 2026, 09:56: 868 µS/cm18 May 2026, 13:27: 888 µS/cm1 Jun 2026, 10:39: 750 µS/cm11 Sep 2026, 15:47: 1111 µS/cm
Every result (4)
SampledResult as publishedReads as
11 Sep 2026, 15:471111 1111 µS/cm
1 Jun 2026, 10:39750 750 µS/cm
18 May 2026, 13:27888 888 µS/cm
1 Apr 2026, 09:56868 868 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
DeterminandMaterialResults First – lastLatest result
Oxygen, Dissolved, % Saturation 9901 River water 4 Apr 2026 – Sep 2026 33.5% 11 Sep 2026
Oxygen, Dissolved as O2 9924 River water 4 Apr 2026 – Sep 2026 3.3 mg/l 11 Sep 2026
Temperature of Water 0076 River water 4 Apr 2026 – Sep 2026 16 °C 11 Sep 2026
pH 0061 River water 4 Apr 2026 – Sep 2026 7.54 11 Sep 2026
Ammoniacal Nitrogen as N 0111 River water 4 Apr 2026 – Sep 2026 below 0.03 mg/l 11 Sep 2026
Nitrate as N 0117 River water 4 Apr 2026 – Sep 2026 below 0.196 mg/l 11 Sep 2026
Orthophosphate, reactive as P 0180 River water 4 Apr 2026 – Sep 2026 0.053 mg/l 11 Sep 2026
Conductivity at 25 C 0077 River water 4 Apr 2026 – Sep 2026 1111 µS/cm 11 Sep 2026
Alkalinity to pH 4.5 as CaCO3 0162 River water 4 Apr 2026 – Sep 2026 270 mg/l 11 Sep 2026
Ammonia un-ionised as N 0119 River water 4 Apr 2026 – Sep 2026 below 0.0003 mg/l 11 Sep 2026
Nitrite as N 0118 River water 4 Apr 2026 – Sep 2026 below 0.004 mg/l 11 Sep 2026
Nitrogen, Total Oxidised as N 0116 River water 4 Apr 2026 – Sep 2026 below 0.2 mg/l 11 Sep 2026
No flow /No sample 7668 River water 2 Jul 2026 – Aug 2026 No flow/discharge at sampling point 11 Aug 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.