River Levels
River Levels

River Allen at Idless Dam (Downstream)

Current River Level


At 10:15pm, Saturday 20th July BST
(9:15pm, Saturday 20th July GMT)

Within the usual range for this location

Steady, no change from previous measurement

Warning: This data is stale! For some reason, we have not been able to obtain updated levels for over 24 hours. The current displayed level is probably incorrect and you should not rely on it.

View upstream gauge levels

Flood Warning Areas Covering Here

River Allen (Kenwyn) from Idless Dam to Truro

No current or recent warnings.

Helford and Fal Rivers

No current or recent warnings.

Other Nearby Flood Warning Areas

River Kenwyn from New Mill Dam to Truro

No current or recent warnings.

River Kenwyn at Truro

No current or recent warnings.

South Cornwall coast at Truro

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: Idless Dam
  • Watercourse: River Allen (downstream)
  • Nearest Town/Village: St Clement
  • Local Authority: Cornwall
  • Ceremonial County: Cornwall
  • Coordinates: 50°17'5"N 5°3'26"W (50.284843,-5.057324)
  • OS Grid: SW822472 (182296,47237)
  • Mapcode (Local): GBR ZF.W0QW
  • Mapcode (Global): FRA 0898.TV1
  • Open Location Code: 9C2P7WMV+W3
  • Maidenhead Locator System: IO70lg38
  • Environment Agency Location ID: 48115
  • Environment Agency Gauge ID: 48115-level-downstage-i-15_min-m
  • River Levels Online ID: 3171
  • Water Information System ID: S19546_FW
  • Operational Area: Fal
  • Catchment Area: West Cornwall and the Fal
  • UK Hydrometric Area: Fal Group
  • Environment Agency Region: South West
  • 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 Allen at Idless Dam (Downstream) is between -0.01m and 0.45m. It has been between these levels for 90% of the time since monitoring began.

The typical recent level of the River Allen at Idless Dam (Downstream) over the past 12 months has been between -0.26m and 0.36m. It has been between these levels for at least 150 days in the past year.

Nearby Monitoring Locations

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