River Levels
River Levels

River Ray at Grendon Underwood (Downstream)

Current River Level


At 3:30am, Saturday 30th September BST
(2:30am, Saturday 30th September GMT)

Within the usual range for this location

Steady, no change from previous measurement at 3:15am, Saturday 30th September BST

View upstream gauge levels

Flood Warning Areas Covering Here

River Ray from the Heath Bridge area to and including the Otmoor Basin

No current or recent warnings.

River Ray and its tributaries from Shipton Lee to and including Islip

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: Grendon Underwood
  • Watercourse: Ray(Oxon)
  • Nearest Town/Village: Grendon Underwood
  • Local Authority: Aylesbury Vale
  • Ceremonial County: Buckinghamshire
  • Coordinates: 51°53'4"N 1°0'46"W (51.884491,-1.012852)
  • OS Grid: SP680211 (468040,221120)
  • Mapcode (Local): GBR 9Z1.W6N
  • Mapcode (Global): VHDTN.DWDQ
  • Open Location Code: 9C3WVXMP+QV
  • Maidenhead Locator System: IO91lv82
  • Environment Agency Location ID: 1471TH
  • Environment Agency Gauge ID: 1471TH-level-downstage-i-15_min-mASD
  • Operational Area: Oxon Ray
  • Catchment Area: Cherwell and Ray
  • UK Hydrometric Area: Thames
  • Environment Agency Region: Thames
  • Datum Type: Above Stage Datum (ASD)

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 River Ray at Grendon Underwood (Downstream) is between -0.38m and 0.21m. It has been between these levels for 90% of the time since monitoring began.

The typical recent level of the River Ray at Grendon Underwood (Downstream) over the past 12 months has been between -0.37m and 0.09m. It has been between these levels for at least 152 days in the past year.

Nearby Monitoring Locations

Other monitoring locations on the River Ray

River Ray Map

There are no other monitored rivers nearby

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