Sidmouth Weirs

EA name: SIDMOUTH WEIRS (also listed as “RSN0947 SIDMOUTH WEIRS”)
Environment Agency sampling point SW-RSN0947 · 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: 12 Dec 2023, 10:472.8 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 8 Oct 2026 and had nothing newer.
Samples banked: 3 since 9 Oct 2023 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)
Where: National Grid 313098, 88679As published, to the nearest 1 m. Open in a map
River, by its own name: Its name does not give one
River, by the map: River SidPlaced by position alone, on a line whose map name differs from its own, 0 m from the line.
Next gauge downstream: Sidmouth On the River Sid · 1.1 km along the river
Nearest gauge upstream: Sidbury On the River Sid · 3.9 km along the river
Why it was sampled: Monitoring (national agency policy) (3 samples)

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

100%

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	100	100%
27 Nov 2023, 11:18	96	96%
9 Oct 2023, 13:45	100.6	100.6%

Dissolved oxygen

as O2 · code 9924 · mg/l

11.2 mg/l

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	11.2	11.2 mg/l
27 Nov 2023, 11:18	10.8	10.8 mg/l
9 Oct 2023, 13:45	10.3	10.3 mg/l

Water temperature

code 0076 · °C

10.1 °C

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	10.1	10.1 °C
27 Nov 2023, 11:18	10	10 °C
9 Oct 2023, 13:45	14	14 °C

pH

code 0061

7.9

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	7.9	7.9
27 Nov 2023, 11:18	7.98	7.98
9 Oct 2023, 13:45	8.04	8.04

Ammonia

ammoniacal nitrogen as N · code 0111 · mg/l

below 0.03 mg/l (not detected above this)

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	<0.03	below 0.03 mg/l (not detected above this)
27 Nov 2023, 11:18	<0.03	below 0.03 mg/l (not detected above this)
9 Oct 2023, 13:45	<0.03	below 0.03 mg/l (not detected above this)

Nitrate

as nitrogen (N) · code 0117 · mg/l

1.99 mg/l

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	1.99	1.99 mg/l
27 Nov 2023, 11:18	2.19	2.19 mg/l
9 Oct 2023, 13:45	2.2	2.2 mg/l

Phosphate

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

0.061 mg/l

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	0.061	0.061 mg/l
27 Nov 2023, 11:18	0.072	0.072 mg/l
9 Oct 2023, 13:45	0.057	0.057 mg/l

Conductivity

at 25 °C · code 0077 · µS/cm

292 µS/cm

Sampled 12 Dec 2023, 2.8 years ago · 3 results banked

Every result (3)

Sampled	Result as published	Reads as
12 Dec 2023, 10:47	292	292 µS/cm
27 Nov 2023, 11:18	359	359 µS/cm
9 Oct 2023, 13:45	382	382 µS/cm

Everything measured here

17 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 17 rows

Determinand	Material	Results	First – last	Latest result
Oxygen, Dissolved, % Saturation 9901	River water	3	Oct 2023 – Dec 2023	100% 12 Dec 2023
Oxygen, Dissolved as O2 9924	River water	3	Oct 2023 – Dec 2023	11.2 mg/l 12 Dec 2023
Temperature of Water 0076	River water	3	Oct 2023 – Dec 2023	10.1 °C 12 Dec 2023
pH 0061	River water	3	Oct 2023 – Dec 2023	7.9 12 Dec 2023
Ammoniacal Nitrogen as N 0111	River water	3	Oct 2023 – Dec 2023	below 0.03 mg/l 12 Dec 2023
Nitrate as N 0117	River water	3	Oct 2023 – Dec 2023	1.99 mg/l 12 Dec 2023
Orthophosphate, reactive as P 0180	River water	3	Oct 2023 – Dec 2023	0.061 mg/l 12 Dec 2023
Conductivity at 25 C 0077	River water	3	Oct 2023 – Dec 2023	292 µS/cm 12 Dec 2023
Alkalinity to pH 4.5 as CaCO3 0162	River water	3	Oct 2023 – Dec 2023	98 mg/l 12 Dec 2023
Ammonia un-ionised as N 0119	River water	3	Oct 2023 – Dec 2023	below 0.00044 mg/l 12 Dec 2023
Carbon, Organic, Dissolved as C :- {DOC} 0301	River water	3	Oct 2023 – Dec 2023	4.5 mg/l 12 Dec 2023
Chloride 0172	River water	3	Oct 2023 – Dec 2023	21 mg/l 12 Dec 2023
Nitrite as N 0118	River water	3	Oct 2023 – Dec 2023	0.01 mg/l 12 Dec 2023
Nitrogen, Total as N 9686	River water	3	Oct 2023 – Dec 2023	2.4 mg/l 12 Dec 2023
Nitrogen, Total Oxidised as N 0116	River water	3	Oct 2023 – Dec 2023	2 mg/l 12 Dec 2023
Phosphorus, Total as P 0348	River water	3	Oct 2023 – Dec 2023	0.082 mg/l 12 Dec 2023
Silica, reactive as SiO2 0182	River water	3	Oct 2023 – Dec 2023	11 mg/l 12 Dec 2023

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.