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Live levels from 3 monitoring stations across Lincolnshire, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Cranwell Line Sluicestructure | 0.09 mASD 42m ago | Normal | ||
| 1.4 km by river | ||||
| Slea Tilting Gate | 0.34 mASD 27m ago | Normal | ||
| 3.7 km by river | ||||
| Leasingham Mill | 0.02 m 27m ago | Low | ||
Also on the Slea by the river map, but filed under another river name: LEASINGHAM MILL R SLEA GS.
Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.
Contains OS data © Crown copyright and database rights 2026.
Streams and rivers with a gauge whose water joins the Slea above one of its gauges, from the source down. The river map knows where gauges are, not every stream, so a tributary without a gauge is not listed here.
No gauged tributary joins the Slea above Leasingham Mill on the river map. Streams without a gauge are not counted here.
No gauge below Leasingham Mill is known on the river map.
Tributaries and where they join are traced on the river map (OS Open Rivers, edition 2026-04) and the Environment Agency’s links between its gauges. The map holds distances between gauges, not the junctions themselves, so a junction is placed between two gauges, and no further up than the tributary’s own lowest gauge. Contains OS data © Crown copyright and database rights 2026.
2 storm overflows are traced upstream of Leasingham Mill, the Slea’s lowest gauge on the river map: on the Slea itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Leasingham Mill: 2 spills over 0.6 hours in total, across all 2.
Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Slea includes the smaller streams that join it there.
Within 3 km of one of the Slea’s gauges in a straight line, but the river map cannot say whether their water reaches it.
A status is the water company’s own monitor: it says whether an overflow is discharging, never how much or why, and a spill does not by itself explain a change in a river level. A status older than two hours is shown as unknown. Annual figures are the official returns: 12/24-hour spills for England and Wales, overflow events for Scotland (Scottish Water counts differently, so the two cannot be compared). “No data” means the monitor produced no usable data that year, not zero. Overflows are placed on OS Open Rivers (edition 2026-04), which leaves out many small channels: an overflow the map cannot place may still drain here. Contains OS data © Crown copyright and database rights 2026. Sewage in Britain’s rivers →
Live status: © Anglian Water storm overflow activity data, licensed under CC BY 4.0. Annual figures for England: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence v3.0.
Dated samples taken by the Environment Agency, not live readings. Results are published days to months after the sample is taken, and many points are sampled only a few times a year, or have not been sampled for years.
3 sampling points on the River Slea and the streams that join it above Leasingham Mill. 0 have a sample from the last 12 months; 1 has any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Slea Culverthorpe Bridge | The Beck | 4.6 km | Last sampled 1 Mar 2023, before the imported period | |
| River Slea (New) at Railway Bridge | River Slea | 1.5 km | Last sampled 1 Mar 2023, before the imported period |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Slea Bonemill Bridge | River Slea | 1.4 km | 4 Apr 2025 · 18 months ago | Oxygen 101.9%Temp 9.1 °CpH 7.81Ammonia below 0.03 mg/l |
Distances are along the river to the gauge named. England's samples only.
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.
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