River Levels
River Levels

Old Mill House Penstock Monitoring Station

Current River Level


At 12:15am, Monday 24th June BST
(11:15pm, Sunday 23rd June GMT)

Within the usual range for this location

Steady, no change from previous measurement at 12:00am, Monday 24th June BST

Important! The levels for this location are measured relative to sea level, not relative to the riverbed. The levels shown here do not, therefore, necessarily represent the actual depth of the water.

Flood Warning Areas Covering Here

River Colne at Willowbank

No current or recent warnings.

Lower River Colne and Frays River

No current or recent warnings.

Other Nearby Flood Warning Areas

River Pinn at Yiewsley

No current or recent warnings.

Colne Brook at Iver

No current or recent warnings.

River Pinn at Uxbridge

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: Old Mill House Penstock
  • Watercourse:
  • Nearest Town/Village:
  • Local Authority: Hillingdon
  • Ceremonial County: Greater London
  • Coordinates: 51°31'34"N 0°29'17"W (51.526136,-0.488324)
  • OS Grid: TQ0496681886 (504966,181886)
  • Mapcode (Local): GBR 15.FLF
  • Mapcode (Global): VHFT4.HW6Y
  • Open Location Code: 9C3XGGG6+FM
  • Maidenhead Locator System: IO91sm16
  • Environment Agency Location ID: 2857TH
  • Environment Agency Gauge ID: 2857TH-level-stage-i-15_min-mAOD
  • Operational Area: Colne
  • Catchment Area: Colne
  • UK Hydrometric Area: Thames
  • Environment Agency Region: Thames
  • Level Datum: Above Ordnance Datum (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 Old Mill House Penstock Monitoring Station is between 28.88m and 29.02m. It has been between these levels for 90% of the time since monitoring began.

The typical recent level of the Old Mill House Penstock Monitoring Station over the past 12 months has been between 28.88m and 28.94m. It has been between these levels for at least 242 days in the past year.

Nearby Monitoring Locations

There are no other monitored rivers nearby

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