Environment Agency monitoring station
North Mymms
Mimmshall Brook · Water End · Colne (Upper) catchment
EA station reference
2810TH
Live measurement feed
Water level over the last seven days
Readings show measured change at this instrument. A station reading is not a flood warning and, without an official threshold, does not prove that the river is safe or dangerous.
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Station location
Blue point = monitoring instrument, not a reported flood.
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About this station
- Monitors
- Mimmshall Brook
- Catchment
- Colne (Upper)
- Nearest named place
- Water End
- EA opening date
- 1 January 1985
- Coordinates
- 51.71807, -0.21912
Nearby designated monitoring areas
Directory areas whose reference point is within approximately 10 km. Proximity does not mean this station controls that area or that a warning is active.
- The Lower Lee tributaries, including the Nazeing Brook, Ching Brook, Cobbins Brook, Pymmes Brook, Rags Brook, Salmons Brook, Turkey Brook, Trinity Marsh Ditch and the Small River LeeDesignated alert area · EA ref 062WAF53LLTribs
- The Radlett Brook at RadlettDesignated warning area · EA ref 062FWF28Radlett
- The Upper River Colne and Radlett Brook at Colney Heath, London Colney, Borehamwood and RadlettDesignated alert area · EA ref 062WAF28UpColne
- The River Colne at Colney Heath including North MymmsDesignated warning area · EA ref 062FWF28CHeath
- The River Colne at London Colney including Colney Street and Broad ColneyDesignated warning area · EA ref 062FWF28LColney
- The Radlett and Borehamwood Brooks at BorehamwoodDesignated warning area · EA ref 062FWF28Boreham
- The Mimmshall Brook at Warrengate Road including Water EndDesignated warning area · EA ref 062FWF28Warrengt
- The Mimmshall Brook at Warrengate Road including South Mimms, Potters Bar, Brookmans Park and Welham GreenDesignated alert area · EA ref 062WAF28Mimmshal
- The River Ver at St Albans including Sopwell, Park Street and FrogmoreDesignated warning area · EA ref 062FWF28StAlbans
- River Lee from Lemsford to Hertford including Welwyn Garden City, Hatfield and Mill GreenDesignated warning area · EA ref 062FWF46Lemsford
Nearby monitoring stations
Use nearby instruments for context, but do not compare absolute station-datum values as if they shared the same baseline.
Source and limits: station directory and readings from the Environment Agency under the Open Government Licence v3.0. API readings can be delayed or unavailable. For warnings and emergency advice, use the official GOV.UK flood service.