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Live levels from 4 monitoring stations across Hampshire, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Crondall Pondtidal | 0.40 mASD 4h ago | Normal | ||
| downstream, distance by river not measured | ||||
| Crondall Bridge | 0.09 mASD 3h ago | Normal | ||
| 3.3 km by river | ||||
| Crookham Village | 0.43 mASD 32m ago | Normal | ||
| 11.8 km by river | ||||
| Bramshillstructure | 0.23 mASD 32m ago | Normal | ||
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 Hart 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.
Joins the Hart between Crookham Village and Bramshill, no more than 11.1 km by river above Bramshill.
| Kings Road Bridge | 68.92 mAOD 4h ago | Normal |
Its water passes Bramshill and every gauge below it on the Hart. It does not pass Crookham Village or the gauges above it.
Below Bramshill, its water next reaches Swallowfield, a gauge on River Blackwater, 8.1 km by river downstream.
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.
4 storm overflows are traced upstream of Bramshill, the Hart’s lowest gauge on the river map: on the Hart itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Bramshill: 118 spills over 1,648 hours in total, across all 4.
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 Hart includes the smaller streams that join it there.
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: © Thames 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.
6 sampling points on the River Hart and the streams that join it above Bramshill, and below it. 6 have a sample from the last 12 months; 6 have 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) |
|---|---|---|---|---|
| Minley Brook at B3013, Fleet | Minley Brook | 8.4 km | 10 Jul 2026 · 3 months ago | Oxygen 29.8%Temp 20.8 °CpH 6.63Ammonia 0.32 mg/l |
| Fleet Brook above Fleet sewage treatment works | Fleet Brook | 7.6 km | 10 Jul 2026 · 3 months ago | Oxygen 47.4%Temp 20.3 °CpH 6.93Ammonia below 0.03 mg/l |
| Hart at Elvetham Park Bridge | River Hart | 6.0 km | 20 Jul 2026 · 3 months ago | Oxygen 67.3%Temp 15.8 °CpH 7.75Ammonia below 0.03 mg/l |
| Fleet Brook above River Hart | Fleet Brook | 5.3 km | 7 Jul 2026 · 3 months ago | Oxygen 45.7%Temp 21 °CpH 7.17Ammonia 1.5 mg/l |
| Hart at Hartford Bridge | River Hart | 3.4 km | 1 Sep 2026 · 37 days ago | Oxygen 59.2%Temp 16.3 °CpH 7.14Ammonia 0.058 mg/l |
| Sampling point | Watercourse (map) | Below the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Hart at Lea Bridge, Hazeley | River Hart | 1.2 km | 10 Jul 2026 · 3 months ago | Oxygen 92.5%Temp 23.5 °CpH 7.42Ammonia 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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