Main Drain at North Carlton Covert, Tillbridge Lane
EA name: MAIN DRAIN AT TILLBRDGE LANE N CARLT COV (also listed as “RSN1692 MAIN DRAIN AT NORTH CARLTON COVERT, TILLBRIDGE LANE”)
Environment Agency sampling point AN-RSN1692 · 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
- 9 Sep 2026, 13:3622 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 9 since 30 Jan 2026 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 492061, 378649As published, to the nearest 1 m. Open in a map
- River, by its own name
- Main Drain
- River, by the map
- Main DrainPlaced on the river its name gives, 4 m from the line.
- Next gauge downstream
- Brayford Pool On the River Witham · 11 km along the river (the path rests on a repair to the map)
- Why it was sampled
- Monitoring (national agency policy) (9 samples)
3 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
36.4%
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | 36.4 | 36.4% |
| 16 Jun 2026, 12:26 | 110.2 | 110.2% |
| 8 Apr 2026, 13:11 | 96.8 | 96.8% |
| 6 Mar 2026, 13:09 | 96.2 | 96.2% |
| 16 Feb 2026, 13:43 | 100.4 | 100.4% |
| 30 Jan 2026, 12:29 | 94.2 | 94.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
3.45 mg/l
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | 3.45 | 3.45 mg/l |
| 16 Jun 2026, 12:26 | 10.5 | 10.5 mg/l |
| 8 Apr 2026, 13:11 | 10.5 | 10.5 mg/l |
| 6 Mar 2026, 13:09 | 11.4 | 11.4 mg/l |
| 16 Feb 2026, 13:43 | 11.9 | 11.9 mg/l |
| 30 Jan 2026, 12:29 | 11.8 | 11.8 mg/l |
Water temperature
code 0076 · °C
17.8 °C
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | 17.8 | 17.8 °C |
| 16 Jun 2026, 12:26 | 17.5 | 17.5 °C |
| 8 Apr 2026, 13:11 | 11.6 | 11.6 °C |
| 6 Mar 2026, 13:09 | 7.9 | 7.9 °C |
| 16 Feb 2026, 13:43 | 7.8 | 7.8 °C |
| 30 Jan 2026, 12:29 | 5.8 | 5.8 °C |
pH
code 0061
7.33
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | 7.33 | 7.33 |
| 16 Jun 2026, 12:26 | 7.73 | 7.73 |
| 8 Apr 2026, 13:11 | 7.97 | 7.97 |
| 6 Mar 2026, 13:09 | 7.99 | 7.99 |
| 16 Feb 2026, 13:43 | 8.04 | 8.04 |
| 30 Jan 2026, 12:29 | 7.78 | 7.78 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.002 mg/l (not detected above this)
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | <0.002 | below 0.002 mg/l (not detected above this) |
| 16 Jun 2026, 12:26 | <0.002 | below 0.002 mg/l (not detected above this) |
| 8 Apr 2026, 13:11 | 0.01 | 0.01 mg/l |
| 6 Mar 2026, 13:09 | <0.002 | below 0.002 mg/l (not detected above this) |
| 16 Feb 2026, 13:43 | 0.0068 | 0.0068 mg/l |
| 30 Jan 2026, 12:29 | 0.0056 | 0.0056 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
below 0.004 mg/l (not detected above this)
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | <0.004 | below 0.004 mg/l (not detected above this) |
| 16 Jun 2026, 12:26 | 0.0049 | 0.0049 mg/l |
| 8 Apr 2026, 13:11 | 2.78 | 2.78 mg/l |
| 6 Mar 2026, 13:09 | 12 | 12 mg/l |
| 16 Feb 2026, 13:43 | 9.29 | 9.29 mg/l |
| 30 Jan 2026, 12:29 | 4 | 4 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.014 mg/l
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | 0.014 | 0.014 mg/l |
| 16 Jun 2026, 12:26 | 0.025 | 0.025 mg/l |
| 8 Apr 2026, 13:11 | 0.0015 | 0.0015 mg/l |
| 6 Mar 2026, 13:09 | 0.0053 | 0.0053 mg/l |
| 16 Feb 2026, 13:43 | 0.093 | 0.093 mg/l |
| 30 Jan 2026, 12:29 | 0.039 | 0.039 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
467 µS/cm
Sampled 2 Jul 2026, 3 months ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jul 2026, 08:15 | 467 | 467 µS/cm |
| 16 Jun 2026, 12:26 | 394 | 394 µS/cm |
| 8 Apr 2026, 13:11 | 840 | 840 µS/cm |
| 6 Mar 2026, 13:09 | 834 | 834 µS/cm |
| 16 Feb 2026, 13:43 | 678 | 678 µS/cm |
| 30 Jan 2026, 12:29 | 460 | 460 µS/cm |
Everything measured here
20 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 20 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 6 | Jan 2026 – Jul 2026 | 36.4% 2 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 6 | Jan 2026 – Jul 2026 | 3.45 mg/l 2 Jul 2026 |
| Temperature of Water 0076 | River water | 6 | Jan 2026 – Jul 2026 | 17.8 °C 2 Jul 2026 |
| pH 0061 | River water | 6 | Jan 2026 – Jul 2026 | 7.33 2 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 6 | Jan 2026 – Jul 2026 | below 0.002 mg/l 2 Jul 2026 |
| Nitrate as N 0117 | River water | 6 | Jan 2026 – Jul 2026 | below 0.004 mg/l 2 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 6 | Jan 2026 – Jul 2026 | 0.014 mg/l 2 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 6 | Jan 2026 – Jul 2026 | 467 µS/cm 2 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 6 | Jan 2026 – Jul 2026 | 210 mg/l 2 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 6 | Jan 2026 – Jul 2026 | below 0.00001 mg/l 2 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 6 | Jan 2026 – Jul 2026 | 20 mg/l 2 Jul 2026 |
| Chloride 0172 | River water | 6 | Jan 2026 – Jul 2026 | 16 mg/l 2 Jul 2026 |
| Flow Type 2896 | River water | 9 | Jan 2026 – Sep 2026 | Dry 9 Sep 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 1 | Feb 2026 – Feb 2026 | 1 text result 16 Feb 2026 |
| Nitrite as N 0118 | River water | 6 | Jan 2026 – Jul 2026 | below 0.001 mg/l 2 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 6 | Jan 2026 – Jul 2026 | below 0.005 mg/l 2 Jul 2026 |
| No flow /No sample 7668 | River water | 3 | May 2026 – Sep 2026 | No flow/discharge at sampling point 9 Sep 2026 |
| Phosphorus, Total as P 0348 | River water | 6 | Jan 2026 – Jul 2026 | 0.095 mg/l 2 Jul 2026 |
| Silica, reactive as SiO2 0182 | River water | 6 | Jan 2026 – Jul 2026 | 17 mg/l 2 Jul 2026 |
| Solids, Suspended at 105 C 0135 | River water | 6 | Jan 2026 – Jul 2026 | 15 mg/l 2 Jul 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.