River Levels
River Levels

Mimmshall Brook at North Mymms

Current River Level

0.330m

At 11:45pm, Thursday 26th January GMT

Within the usual range for this location

Steady, no change from previous measurement at 11:30pm, Thursday 26th January GMT

Short-term forecast: falling

Flood Warning Areas Covering Here

Mimmshall Brook at Warrengate Road

No current or recent warnings.

Mimmshall Brook

No current or recent warnings.

Other Nearby Flood Warning Areas

River Colne at Colney Heath

No current or recent warnings.

Upper River Colne and Radlett Brook

No current or recent warnings.

River Colne at London Colney

No current or recent warnings.

Seven Day Level Chart

Long Term Level Chart

Darker blue shaded areas on long term data indicate maximum and minimum levels for the date (you may need to zoom in closer to see them).

Long term data may have gaps where the API data was not available.

Download long term data as csv

Note: CSV data will include any outlying values that have been ignored by our graphing system as probably erroneous (eg, because they are ridiculously high compared to the values either side of them). It is your responsibility to filter these out if necessary.

Important! If you are planning to retrieve the csv data automatically, you must read and understand the limitations on the data and its availability.

Location and Technical Data

  • Monitoring Station: North Mymms
  • Watercourse: Mimmshall Brook
  • Nearest Town/Village: North Mymms
  • Local Authority: Welwyn Hatfield
  • Ceremonial County: Hertfordshire
  • Coordinates: 51°43'5"N 0°13'8"W (51.718066,-0.219123)
  • OS Grid: TL2312003650 (523120,203650)
  • Mapcode (Local): GBR JB5.CDB
  • Mapcode (Global): VHGPZ.520R
  • Open Location Code: 9C3XPQ9J+69
  • Maidenhead Locator System: IO91vr32
  • Environment Agency Location ID: 2810TH
  • Environment Agency Gauge ID: 2810TH-level-stage-i-15_min-mASD
  • Operational Area: Colne
  • Catchment Area: Colne
  • UK Hydrometric Area: Thames
  • Environment Agency Region: Thames
  • Datum Type: Above Stage Datum (ASD)
  • Stage Datum: 74m AOD

Please note: Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.

The usual range of the Mimmshall Brook at North Mymms is between 0.05m and 1.50m. It has been between these levels for 90% of the time since monitoring began.

The typical recent level of the Mimmshall Brook at North Mymms over the past 12 months has been between 0.25m and 0.33m. It has been between these levels for at least 151 days in the past year.

The highest level ever recorded at the Mimmshall Brook at North Mymms is 2.35m, reached on Tuesday 10th February 2009 at 2:30am.

Note that this data may not take account of recent measurements, as we wait until a level has been verified by the Environment Agency before adding it to our records.

Nearby Monitoring Locations

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