River Calder at Altham Bridge
EA name: RIVER CALDER AT ALTHAM BRIDGE
Environment Agency sampling point NW-88003501 · 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 Mar 2024, 09:322.6 years 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
- 6 since 2 Oct 2023 Imported periods: 1 Oct 2023 – 24 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 377413, 433053As published, to the nearest 1 m. Open in a map
- River, by its own name
- Calder
- River, by the map
- River CalderPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Whalley Weir On the River Calder · 9.0 km along the river
- Nearest gauge upstream
- Padiham Town Centre On the River Calder · 2.8 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
97.8%
Sampled 5 Mar 2024, 2.6 years ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 97.8 | 97.8% |
| 1 Feb 2024, 10:46 | 101.4 | 101.4% |
| 4 Jan 2024, 11:35 | 95.4 | 95.4% |
| 1 Dec 2023, 10:24 | 98.4 | 98.4% |
| 10 Nov 2023, 10:25 | 96.8 | 96.8% |
| 2 Oct 2023, 12:37 | 95.7 | 95.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
12 mg/l
Sampled 5 Mar 2024, 2.6 years ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 12 | 12 mg/l |
| 1 Feb 2024, 10:46 | 12.6 | 12.6 mg/l |
| 4 Jan 2024, 11:35 | 11.4 | 11.4 mg/l |
| 1 Dec 2023, 10:24 | 13.5 | 13.5 mg/l |
| 10 Nov 2023, 10:25 | 11.4 | 11.4 mg/l |
| 2 Oct 2023, 12:37 | 9.82 | 9.82 mg/l |
Water temperature
code 0076 · °C
6.4 °C
Sampled 5 Mar 2024, 2.6 years ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 6.4 | 6.4 °C |
| 1 Feb 2024, 10:46 | 6 | 6 °C |
| 4 Jan 2024, 11:35 | 7.4 | 7.4 °C |
| 1 Dec 2023, 10:24 | 2.3 | 2.3 °C |
| 10 Nov 2023, 10:25 | 8.1 | 8.1 °C |
| 2 Oct 2023, 12:37 | 14.1 | 14.1 °C |
pH
code 0061
8.15
Sampled 5 Mar 2024, 2.6 years ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 8.15 | 8.15 |
| 1 Feb 2024, 10:46 | 8.03 | 8.03 |
| 4 Jan 2024, 11:35 | 7.71 | 7.71 |
| 1 Dec 2023, 10:24 | 7.88 | 7.88 |
| 10 Nov 2023, 10:25 | 7.88 | 7.88 |
| 2 Oct 2023, 12:37 | 9.17 | 9.17 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.087 mg/l
Sampled 5 Mar 2024, 2.6 years ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 0.087 | 0.087 mg/l |
| 1 Feb 2024, 10:46 | 0.1 | 0.1 mg/l |
| 4 Jan 2024, 11:35 | 0.16 | 0.16 mg/l |
| 1 Dec 2023, 10:24 | 0.43 | 0.43 mg/l |
| 10 Nov 2023, 10:25 | 0.11 | 0.11 mg/l |
| 2 Oct 2023, 12:37 | 0.21 | 0.21 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.57 mg/l
Sampled 5 Mar 2024, 2.6 years ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 2.57 | 2.57 mg/l |
| 4 Jan 2024, 11:35 | 1.08 | 1.08 mg/l |
| 1 Dec 2023, 10:24 | 2.66 | 2.66 mg/l |
| 10 Nov 2023, 10:25 | 1.87 | 1.87 mg/l |
| 2 Oct 2023, 12:37 | 2.32 | 2.32 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.053 mg/l
Sampled 5 Mar 2024, 2.6 years ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 0.053 | 0.053 mg/l |
| 1 Feb 2024, 10:46 | 0.039 | 0.039 mg/l |
| 4 Jan 2024, 11:35 | 0.093 | 0.093 mg/l |
| 1 Dec 2023, 10:24 | 0.056 | 0.056 mg/l |
| 10 Nov 2023, 10:25 | 0.039 | 0.039 mg/l |
| 2 Oct 2023, 12:37 | 0.051 | 0.051 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
432 µS/cm
Sampled 5 Mar 2024, 2.6 years ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2024, 09:32 | 432 | 432 µS/cm |
| 1 Feb 2024, 10:46 | 283 | 283 µS/cm |
| 4 Jan 2024, 11:35 | 196 | 196 µS/cm |
| 1 Dec 2023, 10:24 | 366 | 366 µS/cm |
| 10 Nov 2023, 10:25 | 286 | 286 µS/cm |
| 2 Oct 2023, 12:37 | 296 | 296 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 | 6 | Oct 2023 – Mar 2024 | 97.8% 5 Mar 2024 |
| Oxygen, Dissolved as O2 9924 | River water | 6 | Oct 2023 – Mar 2024 | 12 mg/l 5 Mar 2024 |
| Temperature of Water 0076 | River water | 6 | Oct 2023 – Mar 2024 | 6.4 °C 5 Mar 2024 |
| pH 0061 | River water | 6 | Oct 2023 – Mar 2024 | 8.15 5 Mar 2024 |
| Ammoniacal Nitrogen as N 0111 | River water | 6 | Oct 2023 – Mar 2024 | 0.087 mg/l 5 Mar 2024 |
| Nitrate as N 0117 | River water | 5 | Oct 2023 – Mar 2024 | 2.57 mg/l 5 Mar 2024 |
| Orthophosphate, reactive as P 0180 | River water | 6 | Oct 2023 – Mar 2024 | 0.053 mg/l 5 Mar 2024 |
| Conductivity at 25 C 0077 | River water | 6 | Oct 2023 – Mar 2024 | 432 µS/cm 5 Mar 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 6 | Oct 2023 – Mar 2024 | 88 mg/l 5 Mar 2024 |
| Ammonia un-ionised as N 0119 | River water | 6 | Oct 2023 – Mar 2024 | 0.00122 mg/l 5 Mar 2024 |
| Nitrite as N 0118 | River water | 6 | Oct 2023 – Mar 2024 | 0.032 mg/l 5 Mar 2024 |
| Nitrogen, Total Oxidised as N 0116 | River water | 5 | Oct 2023 – Mar 2024 | 2.6 mg/l 5 Mar 2024 |
| Solids, Suspended at 105 C 0135 | River water | 2 | Oct 2023 – Jan 2024 | 33 mg/l 4 Jan 2024 |
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.