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.
Streams and rivers with a gauge whose water joins the Amwell Loop 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.
Its water passes every gauge on the Amwell Loop, from Tumbling Bay Weir down.
Gauged streams joining the Beane
Dane End Tributary: joins the Beane above Hertford, Hartham Park (its lowest gauge is 12.1 km by river above it). Gauge, source first: Dane EndNormal; and 1 more gauge further up.
28 storm overflows are traced upstream of Tumbling Bay Weir, the Amwell Loop’s lowest gauge on the river map: on the Amwell Loop itself, on its gauged tributaries, and on smaller streams that join above there.
0 report discharging now
23 not discharging
5 offline or silent: 3 monitor offline, 0 status unknown, 2 no live feed
Official figures for 2025, for the overflows traced upstream of Tumbling Bay Weir: 86 spills over 429 hours in total, across all 28.
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 Amwell Loop includes the smaller streams that join it there.
Above Tumbling Bay Weir, the Amwell Loop’s highest gauge1 overflow
Chapmore EndNot discharging Thames Water · into Rib · 7.9 km by river above Tumbling Bay Weir · 2025: 7 spills, 9.8 h
River Lee, above Luton, Stockingstone Roadjoins the Amwell Loop above Tumbling Bay Weir1 overflow
N/ANot discharging Thames Water · into N/A · 3.0 km by river above Luton, Stockingstone Road · 2025: 4 spills, 1.2 h · placed on the river by its position alone
River Lee, above Luton East Hydejoins the Amwell Loop above Tumbling Bay Weir18 overflows
N/ANot discharging Thames Water · into N/A · 7.0 km by river above Luton East Hyde · 2025: 0 spills, 0 h · placed on the river by its position alone
N/AMonitor offline Thames Water · into N/A · 5.8 km by river above Luton East Hyde · 2025: 0 spills, 0 h · placed on the river by its position alone
N/ANot discharging Thames Water · into N/A · 5.6 km by river above Luton East Hyde · 2025: 0 spills, 0 h · placed on the river by its position alone
CSO At New Bedford RoadNot discharging Thames Water · into River Lee · 5.5 km by river above Luton East Hyde · 2025: 0 spills, 0 h
N/AMonitor offline Thames Water · into N/A · 5.1 km by river above Luton East Hyde · 2025: 2 spills, 0.2 h · placed on the river by its position alone
N/ANot discharging Thames Water · into N/A · 5.1 km by river above Luton East Hyde · 2025: 1 spill, 0.1 h · placed on the river by its position alone
N/ANo live feed Thames Water · into N/A · 5.1 km by river above Luton East Hyde · 2025: 2 spills, 1.1 h · placed on the river by its position alone
N/AMonitor offline Thames Water · into N/A · 4.9 km by river above Luton East Hyde · 2025: 12 spills, 79 h · placed on the river by its position alone
CSO At Barbers LaneNot discharging Thames Water · into Lee · 4.9 km by river above Luton East Hyde · 2025: 0 spills, 0 h
N/ANot discharging Thames Water · into N/A · 3.7 km by river above Luton East Hyde · 2025: 0 spills, 0 h · placed on the river by its position alone
N/ANot discharging Thames Water · into N/A · 3.7 km by river above Luton East Hyde · 2025: 0 spills, 0 h · placed on the river by its position alone
N/ANot discharging Thames Water · into N/A · 3.7 km by river above Luton East Hyde · 2025: 0 spills, 0 h · placed on the river by its position alone
N/ANot discharging Thames Water · into N/A · 3.7 km by river above Luton East Hyde · 2025: 0 spills, 0 h · placed on the river by its position alone
N/ANot discharging Thames Water · into N/A · 3.7 km by river above Luton East Hyde · 2025: 1 spill, 0.3 h · placed on the river by its position alone
N/ANot discharging Thames Water · into N/A · 3.7 km by river above Luton East Hyde · 2025: 20 spills, 5.7 h · placed on the river by its position alone
CSO At Vauxhall MotorsNot discharging Thames Water · into River Lee / Lea · 3.7 km by river above Luton East Hyde · 2025: 0 spills, 0 h
Park Town CSONot discharging Thames Water · into River Lee · 3.5 km by river above Luton East Hyde · 2025: 0 spills, 0 h
Kimpton Road CSONot discharging Thames Water · into The River Lee · 2.2 km by river above Luton East Hyde · 2025: 0 spills, 0 h
River Lee, above Harpendenjoins the Amwell Loop above Tumbling Bay Weir1 overflow
Luton (East Hyde) WwTWNot discharging Thames Water · into The River Lee · 3.2 km by river above Harpenden · 2025: 6 spills, 28 h
River Lee, above Waterhalljoins the Amwell Loop above Tumbling Bay Weir4 overflows
HarpendenNot discharging Thames Water · into Lee · 21.2 km by river above Waterhall · 2025: 7 spills, 69 h
Wheathampstead Pumping StationNot discharging Thames Water · into River Lee · 17.3 km by river above Waterhall · 2025: 3 spills, 21 h
Hatfield (Mill Green)No live feed Thames Water · into Lee · 6.2 km by river above Waterhall · 2025: 6 spills, 58 h
Essendon, Holywell BridgeNot discharging Thames Water · into Lea · 3.4 km by river above Waterhall · 2025: 0 spills, 0 h
River Rib, above Buntingfordjoins the Amwell Loop above Tumbling Bay Weir1 overflow
Therfield WTWNot discharging Thames Water · into River Rib · 6.1 km by river above Buntingford · 2025: 5 spills, 59 h
River Rib, above Wadesmilljoins the Amwell Loop above Tumbling Bay Weir1 overflow
Buntingford WwTWNot discharging Thames Water · into The River Rib · 19.2 km by river above Wadesmill · 2025: 3 spills, 5.3 h
River Quin, above Braughingjoins the Rib1 overflow
Barkway Wastewater Treatment WorksNot discharging Thames Water · into The River Quin · 11.8 km by river above Braughing · 2025: 7 spills, 93 h
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.
31 sampling points on the Amwell Loop and the streams that join it above Tumbling Bay Weir, and below it. 26 have a sample from the last 12 months; 29 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.
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.
