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Live levels from 2 monitoring stations across Hertfordshire, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Hemel Hempstead, Old Fishery Lane | 0.61 mASD 28m ago | Low | ||
| 1.9 km by river | ||||
| Hemel Hempstead, Two Waters Road | 0.18 mASD 28m ago | Low | ||
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 Bulbourne 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 Bulbourne above Hemel Hempstead, Two Waters Road on the river map. Streams without a gauge are not counted here.
No gauge below Hemel Hempstead, Two Waters Road 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.
None of the storm overflows FloodRadar holds is traced upstream of Hemel Hempstead, Two Waters Road on the river map. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow.
Within 3 km of one of the Bulbourne’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: © 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.
4 sampling points on the River Bulbourne and the streams that join it above Hemel Hempstead, Two Waters Road. 4 have a sample from the last 12 months; 4 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) |
|---|---|---|---|---|
| Bulbourne above G.U.C. at Lock 55, Berkhamstead | River Bulbourne | 5.0 km | 6 May 2026 · 5 months ago | Oxygen 95.6% Mar 2026Temp 9.2 °C Mar 2026pH 7.92 Mar 2026Ammonia below 0.03 mg/l Mar 2026 |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Bulbourne at Old Fishery Lane gauging station | River Bulbourne | 1.9 km | 5 Jan 2026 · 9 months ago | Oxygen 91.7%Temp 3.4 °CpH 7.87Conductivity 696 µS/cm |
| Bulbourne the Fishery Inn | River Bulbourne | 1.4 km | 21 Sep 2026 · 17 days ago | Oxygen 89.7%Temp 13.2 °CpH 7.83Ammonia 0.054 mg/l |
| Bulbourne above Gade | River Bulbourne | 0.1 km | 30 Sep 2026 · 8 days ago | Oxygen 76.8%Temp 14.9 °CpH 7.49Ammonia 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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