Little Don downstream of Underbank Reservoir
EA name: LITTLE DON D/S UNDERBANK RESERVOIR
Environment Agency sampling point NE-49301804 · 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
- 16 Jun 2026, 11:004 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 15 Jul 2024 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 425368, 399165As published, to the nearest 1 m. Open in a map
- River, by its own name
- Little Don
- River, by the map
- The Porter RiverPlaced on the river its name gives, 4 m from the line.
- Next gauge downstream
- Stocksbridge Steelworks On the Porter River · 0.7 km along the river
- Why it was sampled
- Monitoring (national agency policy) (28 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.2%
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 98.2 | 98.2% |
| 4 Jun 2026, 11:11 | 95.3 | 95.3% |
| 21 May 2026, 11:49 | 100.1 | 100.1% |
| 15 May 2026, 13:24 | 98.4 | 98.4% |
| 13 Apr 2026, 10:55 | 100.7 | 100.7% |
| 17 Mar 2026, 10:13 | 95.9 | 95.9% |
| 12 Mar 2026, 11:14 | 102 | 102% |
| 17 Feb 2026, 11:15 | 103.5 | 103.5% |
| 5 Feb 2026, 12:18 | 102.6 | 102.6% |
| 26 Jan 2026, 11:07 | 102.8 | 102.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.94 mg/l
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 9.94 | 9.94 mg/l |
| 4 Jun 2026, 11:11 | 10.3 | 10.3 mg/l |
| 21 May 2026, 11:49 | 10.8 | 10.8 mg/l |
| 15 May 2026, 13:24 | 10.8 | 10.8 mg/l |
| 13 Apr 2026, 10:55 | 11.6 | 11.6 mg/l |
| 17 Mar 2026, 10:13 | 11.4 | 11.4 mg/l |
| 12 Mar 2026, 11:14 | 12.2 | 12.2 mg/l |
| 17 Feb 2026, 11:15 | 13.5 | 13.5 mg/l |
| 5 Feb 2026, 12:18 | 13.4 | 13.4 mg/l |
| 26 Jan 2026, 11:07 | 13.4 | 13.4 mg/l |
Water temperature
code 0076 · °C
14.7 °C
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 14.7 | 14.7 °C |
| 4 Jun 2026, 11:11 | 11.9 | 11.9 °C |
| 21 May 2026, 11:49 | 12 | 12 °C |
| 15 May 2026, 13:24 | 11.3 | 11.3 °C |
| 13 Apr 2026, 10:55 | 9.1 | 9.1 °C |
| 17 Mar 2026, 10:13 | 7.7 | 7.7 °C |
| 12 Mar 2026, 11:14 | 7.7 | 7.7 °C |
| 17 Feb 2026, 11:15 | 4.1 | 4.1 °C |
| 5 Feb 2026, 12:18 | 4.1 | 4.1 °C |
| 26 Jan 2026, 11:07 | 4.3 | 4.3 °C |
pH
code 0061
7.55
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 7.55 | 7.55 |
| 4 Jun 2026, 11:11 | 7.13 | 7.13 |
| 21 May 2026, 11:49 | 7.51 | 7.51 |
| 15 May 2026, 13:24 | 7.02 | 7.02 |
| 13 Apr 2026, 10:55 | 7.35 | 7.35 |
| 17 Mar 2026, 10:13 | 7.59 | 7.59 |
| 12 Mar 2026, 11:14 | 7.67 | 7.67 |
| 17 Feb 2026, 11:15 | 7.73 | 7.73 |
| 5 Feb 2026, 12:18 | 7.53 | 7.53 |
| 26 Jan 2026, 11:07 | 7.54 | 7.54 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.051 mg/l
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 0.051 | 0.051 mg/l |
| 4 Jun 2026, 11:11 | 0.081 | 0.081 mg/l |
| 21 May 2026, 11:49 | 0.06 | 0.06 mg/l |
| 15 May 2026, 13:24 | 0.029 | 0.029 mg/l |
| 13 Apr 2026, 10:55 | 0.044 | 0.044 mg/l |
| 17 Mar 2026, 10:13 | 0.048 | 0.048 mg/l |
| 12 Mar 2026, 11:14 | 0.04 | 0.04 mg/l |
| 17 Feb 2026, 11:15 | 0.045 | 0.045 mg/l |
| 5 Feb 2026, 12:18 | 0.052 | 0.052 mg/l |
| 26 Jan 2026, 11:07 | 0.028 | 0.028 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.974 mg/l
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 0.974 | 0.974 mg/l |
| 4 Jun 2026, 11:11 | 0.973 | 0.973 mg/l |
| 21 May 2026, 11:49 | 0.99 | 0.99 mg/l |
| 15 May 2026, 13:24 | 1.09 | 1.09 mg/l |
| 13 Apr 2026, 10:55 | 1.29 | 1.29 mg/l |
| 17 Mar 2026, 10:13 | 1.29 | 1.29 mg/l |
| 12 Mar 2026, 11:14 | 1.09 | 1.09 mg/l |
| 17 Feb 2026, 11:15 | 1.49 | 1.49 mg/l |
| 5 Feb 2026, 12:18 | 1.59 | 1.59 mg/l |
| 26 Jan 2026, 11:07 | 1.68 | 1.68 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.011 mg/l
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 0.011 | 0.011 mg/l |
| 4 Jun 2026, 11:11 | 0.011 | 0.011 mg/l |
| 21 May 2026, 11:49 | 0.0089 | 0.0089 mg/l |
| 15 May 2026, 13:24 | 0.0058 | 0.0058 mg/l |
| 13 Apr 2026, 10:55 | 0.006 | 0.006 mg/l |
| 17 Mar 2026, 10:13 | 0.01 | 0.01 mg/l |
| 12 Mar 2026, 11:14 | 0.0081 | 0.0081 mg/l |
| 17 Feb 2026, 11:15 | 0.0092 | 0.0092 mg/l |
| 5 Feb 2026, 12:18 | 0.011 | 0.011 mg/l |
| 26 Jan 2026, 11:07 | 0.014 | 0.014 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
194 µS/cm
Sampled 16 Jun 2026, 4 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Jun 2026, 11:00 | 194 | 194 µS/cm |
| 4 Jun 2026, 11:11 | 183 | 183 µS/cm |
| 21 May 2026, 11:49 | 187 | 187 µS/cm |
| 15 May 2026, 13:24 | 184 | 184 µS/cm |
| 13 Apr 2026, 10:55 | 160 | 160 µS/cm |
| 17 Mar 2026, 10:13 | 141 | 141 µS/cm |
| 12 Mar 2026, 11:14 | 149 | 149 µS/cm |
| 17 Feb 2026, 11:15 | 148 | 148 µS/cm |
| 5 Feb 2026, 12:18 | 141 | 141 µS/cm |
| 26 Jan 2026, 11:07 | 154 | 154 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 | 10 | Jan 2026 – Jun 2026 | 98.2% 16 Jun 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 10 | Jan 2026 – Jun 2026 | 9.94 mg/l 16 Jun 2026 |
| Temperature of Water 0076 | River water | 10 | Jan 2026 – Jun 2026 | 14.7 °C 16 Jun 2026 |
| pH 0061 | River water | 10 | Jan 2026 – Jun 2026 | 7.55 16 Jun 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 10 | Jan 2026 – Jun 2026 | 0.051 mg/l 16 Jun 2026 |
| Nitrate as N 0117 | River water | 10 | Jan 2026 – Jun 2026 | 0.974 mg/l 16 Jun 2026 |
| Orthophosphate, reactive as P 0180 | River water | 10 | Jan 2026 – Jun 2026 | 0.011 mg/l 16 Jun 2026 |
| Conductivity at 25 C 0077 | River water | 10 | Jan 2026 – Jun 2026 | 194 µS/cm 16 Jun 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 10 | Jan 2026 – Jun 2026 | 23 mg/l 16 Jun 2026 |
| Ammonia un-ionised as N 0119 | River water | 10 | Jan 2026 – Jun 2026 | 0.00047 mg/l 16 Jun 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Jul 2024 – Jun 2026 | below 1 mg/l 4 Jun 2026 |
| Nitrite as N 0118 | River water | 10 | Jan 2026 – Jun 2026 | 0.016 mg/l 16 Jun 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 10 | Jan 2026 – Jun 2026 | 0.99 mg/l 16 Jun 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.