River level River Colne at London Colney

Check for flood warnings in this area

Latest recorded level 0.83m at 1:00am Tuesday 16 July 2019.

River levels at this location in the last 5 days

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• Measured level
• When the water level reaches 1.50m here, minor flooding is possible in this area
• Highest recorded level. Hide
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Observed data

DateTime	Value	Error
2019-07-16T00:00Z	0.828	false
2019-07-15T23:45Z	0.828	false
2019-07-15T23:30Z	0.827	false
2019-07-15T23:15Z	0.828	false
2019-07-15T23:00Z	0.828	false
2019-07-15T22:45Z	0.827	false
2019-07-15T22:30Z	0.827	false
2019-07-15T22:15Z	0.827	false
2019-07-15T22:00Z	0.825	false
2019-07-15T21:45Z	0.825	false
2019-07-15T21:30Z	0.824	false
2019-07-15T21:15Z	0.824	false
2019-07-15T21:00Z	0.823	false
2019-07-15T20:45Z	0.824	false
2019-07-15T20:30Z	0.823	false
2019-07-15T20:15Z	0.822	false
2019-07-15T20:00Z	0.821	false
2019-07-15T19:45Z	0.821	false
2019-07-15T19:30Z	0.821	false
2019-07-15T19:15Z	0.822	false
2019-07-15T19:00Z	0.821	false
2019-07-15T18:45Z	0.821	false
2019-07-15T18:30Z	0.821	false
2019-07-15T18:15Z	0.821	false
2019-07-15T18:00Z	0.821	false
2019-07-15T17:45Z	0.82	false
2019-07-15T17:30Z	0.82	false
2019-07-15T17:15Z	0.821	false
2019-07-15T17:00Z	0.821	false
2019-07-15T16:45Z	0.821	false
2019-07-15T16:30Z	0.82	false
2019-07-15T16:15Z	0.82	false
2019-07-15T16:00Z	0.82	false
2019-07-15T15:45Z	0.82	false
2019-07-15T15:30Z	0.821	false
2019-07-15T15:15Z	0.82	false
2019-07-15T15:00Z	0.821	false
2019-07-15T14:45Z	0.821	false
2019-07-15T14:30Z	0.821	false
2019-07-15T14:15Z	0.821	false
2019-07-15T14:00Z	0.821	false
2019-07-15T13:45Z	0.821	false
2019-07-15T13:30Z	0.821	false
2019-07-15T13:15Z	0.821	false
2019-07-15T13:00Z	0.821	false
2019-07-15T12:45Z	0.821	false
2019-07-15T12:30Z	0.821	false
2019-07-15T12:15Z	0.821	false
2019-07-15T12:00Z	0.821	false
2019-07-15T11:45Z	0.821	false
2019-07-15T11:30Z	0.821	false
2019-07-15T11:15Z	0.821	false
2019-07-15T11:00Z	0.821	false
2019-07-15T10:45Z	0.821	false
2019-07-15T10:30Z	0.821	false
2019-07-15T10:15Z	0.821	false
2019-07-15T10:00Z	0.821	false
2019-07-15T09:45Z	0.821	false
2019-07-15T09:30Z	0.822	false
2019-07-15T09:15Z	0.822	false
2019-07-15T09:00Z	0.822	false
2019-07-15T08:45Z	0.822	false
2019-07-15T08:30Z	0.823	false
2019-07-15T08:15Z	0.823	false
2019-07-15T08:00Z	0.823	false
2019-07-15T07:45Z	0.823	false
2019-07-15T07:30Z	0.824	false
2019-07-15T07:15Z	0.825	false
2019-07-15T07:00Z	0.825	false
2019-07-15T06:45Z	0.825	false
2019-07-15T06:30Z	0.825	false
2019-07-15T06:15Z	0.826	false
2019-07-15T06:00Z	0.826	false
2019-07-15T05:45Z	0.826	false
2019-07-15T05:30Z	0.826	false
2019-07-15T05:15Z	0.827	false
2019-07-15T05:00Z	0.828	false
2019-07-15T04:45Z	0.828	false
2019-07-15T04:30Z	0.828	false
2019-07-15T04:15Z	0.829	false
2019-07-15T04:00Z	0.828	false
2019-07-15T03:45Z	0.828	false
2019-07-15T03:30Z	0.828	false
2019-07-15T03:15Z	0.827	false
2019-07-15T03:00Z	0.828	false
2019-07-15T02:45Z	0.829	false
2019-07-15T02:30Z	0.829	false
2019-07-15T02:15Z	0.829	false
2019-07-15T02:00Z	0.829	false
2019-07-15T01:45Z	0.83	false
2019-07-15T01:30Z	0.829	false
2019-07-15T01:15Z	0.83	false
2019-07-15T01:00Z	0.829	false
2019-07-15T00:45Z	0.829	false
2019-07-15T00:30Z	0.829	false
2019-07-15T00:15Z	0.829	false
2019-07-15T00:00Z	0.829	false
2019-07-14T23:45Z	0.828	false
2019-07-14T23:30Z	0.829	false
2019-07-14T23:15Z	0.828	false
2019-07-14T23:00Z	0.828	false
2019-07-14T22:45Z	0.828	false
2019-07-14T22:30Z	0.828	false
2019-07-14T22:15Z	0.828	false
2019-07-14T22:00Z	0.828	false
2019-07-14T21:45Z	0.827	false
2019-07-14T21:30Z	0.827	false
2019-07-14T21:15Z	0.826	false
2019-07-14T21:00Z	0.826	false
2019-07-14T20:45Z	0.825	false
2019-07-14T20:30Z	0.824	false
2019-07-14T20:15Z	0.823	false
2019-07-14T20:00Z	0.822	false
2019-07-14T19:45Z	0.822	false
2019-07-14T19:30Z	0.821	false
2019-07-14T19:15Z	0.821	false
2019-07-14T19:00Z	0.821	false
2019-07-14T18:45Z	0.821	false
2019-07-14T18:30Z	0.821	false
2019-07-14T18:15Z	0.821	false
2019-07-14T18:00Z	0.821	false
2019-07-14T17:45Z	0.821	false
2019-07-14T17:30Z	0.821	false
2019-07-14T17:15Z	0.821	false
2019-07-14T17:00Z	0.82	false
2019-07-14T16:45Z	0.821	false
2019-07-14T16:30Z	0.82	false
2019-07-14T16:15Z	0.82	false
2019-07-14T16:00Z	0.82	false
2019-07-14T15:45Z	0.821	false
2019-07-14T15:30Z	0.821	false
2019-07-14T15:15Z	0.821	false
2019-07-14T15:00Z	0.82	false
2019-07-14T14:45Z	0.821	false
2019-07-14T14:30Z	0.821	false
2019-07-14T14:15Z	0.821	false
2019-07-14T14:00Z	0.821	false
2019-07-14T13:45Z	0.821	false
2019-07-14T13:30Z	0.821	false
2019-07-14T13:15Z	0.821	false
2019-07-14T13:00Z	0.821	false
2019-07-14T12:45Z	0.821	false
2019-07-14T12:30Z	0.821	false
2019-07-14T12:15Z	0.821	false
2019-07-14T12:00Z	0.821	false
2019-07-14T11:45Z	0.821	false
2019-07-14T11:30Z	0.821	false
2019-07-14T11:15Z	0.822	false
2019-07-14T11:00Z	0.822	false
2019-07-14T10:45Z	0.822	false
2019-07-14T10:30Z	0.822	false
2019-07-14T10:15Z	0.822	false
2019-07-14T10:00Z	0.823	false
2019-07-14T09:45Z	0.823	false
2019-07-14T09:30Z	0.823	false
2019-07-14T09:15Z	0.824	false
2019-07-14T09:00Z	0.823	false
2019-07-14T08:45Z	0.824	false
2019-07-14T08:30Z	0.824	false
2019-07-14T08:15Z	0.825	false
2019-07-14T08:00Z	0.825	false
2019-07-14T07:45Z	0.826	false
2019-07-14T07:30Z	0.826	false
2019-07-14T07:15Z	0.827	false
2019-07-14T07:00Z	0.828	false
2019-07-14T06:45Z	0.828	false
2019-07-14T06:30Z	0.828	false
2019-07-14T06:15Z	0.828	false
2019-07-14T06:00Z	0.828	false
2019-07-14T05:45Z	0.828	false
2019-07-14T05:30Z	0.828	false
2019-07-14T05:15Z	0.828	false
2019-07-14T05:00Z	0.827	false
2019-07-14T04:45Z	0.827	false
2019-07-14T04:30Z	0.826	false
2019-07-14T04:15Z	0.826	false
2019-07-14T04:00Z	0.826	false
2019-07-14T03:45Z	0.826	false
2019-07-14T03:30Z	0.827	false
2019-07-14T03:15Z	0.827	false
2019-07-14T03:00Z	0.827	false
2019-07-14T02:45Z	0.827	false
2019-07-14T02:30Z	0.827	false
2019-07-14T02:15Z	0.826	false
2019-07-14T02:00Z	0.826	false
2019-07-14T01:45Z	0.827	false
2019-07-14T01:30Z	0.827	false
2019-07-14T01:15Z	0.827	false
2019-07-14T01:00Z	0.827	false
2019-07-14T00:45Z	0.827	false
2019-07-14T00:30Z	0.827	false
2019-07-14T00:15Z	0.827	false
2019-07-14T00:00Z	0.826	false
2019-07-13T23:45Z	0.827	false
2019-07-13T23:30Z	0.826	false
2019-07-13T23:15Z	0.826	false
2019-07-13T23:00Z	0.827	false
2019-07-13T22:45Z	0.826	false
2019-07-13T22:30Z	0.826	false
2019-07-13T22:15Z	0.826	false
2019-07-13T22:00Z	0.826	false
2019-07-13T21:45Z	0.825	false
2019-07-13T21:30Z	0.825	false
2019-07-13T21:15Z	0.825	false
2019-07-13T21:00Z	0.825	false
2019-07-13T20:45Z	0.825	false
2019-07-13T20:30Z	0.825	false
2019-07-13T20:15Z	0.825	false
2019-07-13T20:00Z	0.824	false
2019-07-13T19:45Z	0.824	false
2019-07-13T19:30Z	0.823	false
2019-07-13T19:15Z	0.823	false
2019-07-13T19:00Z	0.823	false
2019-07-13T18:45Z	0.822	false
2019-07-13T18:30Z	0.822	false
2019-07-13T18:15Z	0.822	false
2019-07-13T18:00Z	0.822	false
2019-07-13T17:45Z	0.822	false
2019-07-13T17:30Z	0.821	false
2019-07-13T17:15Z	0.821	false
2019-07-13T17:00Z	0.822	false
2019-07-13T16:45Z	0.822	false
2019-07-13T16:30Z	0.822	false
2019-07-13T16:15Z	0.822	false
2019-07-13T16:00Z	0.822	false
2019-07-13T15:45Z	0.822	false
2019-07-13T15:30Z	0.823	false
2019-07-13T15:15Z	0.822	false
2019-07-13T15:00Z	0.823	false
2019-07-13T14:45Z	0.823	false
2019-07-13T14:30Z	0.823	false
2019-07-13T14:15Z	0.823	false
2019-07-13T14:00Z	0.823	false
2019-07-13T13:45Z	0.823	false
2019-07-13T13:30Z	0.823	false
2019-07-13T13:15Z	0.823	false
2019-07-13T13:00Z	0.823	false
2019-07-13T12:45Z	0.823	false
2019-07-13T12:30Z	0.824	false
2019-07-13T12:15Z	0.824	false
2019-07-13T12:00Z	0.824	false
2019-07-13T11:45Z	0.825	false
2019-07-13T11:30Z	0.826	false
2019-07-13T11:15Z	0.826	false
2019-07-13T11:00Z	0.825	false
2019-07-13T10:45Z	0.824	false
2019-07-13T10:30Z	0.824	false
2019-07-13T10:15Z	0.823	false
2019-07-13T10:00Z	0.823	false
2019-07-13T09:45Z	0.823	false
2019-07-13T09:30Z	0.823	false
2019-07-13T09:15Z	0.822	false
2019-07-13T09:00Z	0.823	false
2019-07-13T08:45Z	0.823	false
2019-07-13T08:30Z	0.823	false
2019-07-13T08:15Z	0.824	false
2019-07-13T08:00Z	0.824	false
2019-07-13T07:45Z	0.824	false
2019-07-13T07:30Z	0.825	false
2019-07-13T07:15Z	0.826	false
2019-07-13T07:00Z	0.825	false
2019-07-13T06:45Z	0.825	false
2019-07-13T06:30Z	0.826	false
2019-07-13T06:15Z	0.827	false
2019-07-13T06:00Z	0.827	false
2019-07-13T05:45Z	0.827	false
2019-07-13T05:30Z	0.827	false
2019-07-13T05:15Z	0.826	false
2019-07-13T05:00Z	0.827	false
2019-07-13T04:45Z	0.827	false
2019-07-13T04:30Z	0.826	false
2019-07-13T04:15Z	0.827	false
2019-07-13T04:00Z	0.826	false
2019-07-13T03:45Z	0.826	false
2019-07-13T03:30Z	0.826	false
2019-07-13T03:15Z	0.826	false
2019-07-13T03:00Z	0.825	false
2019-07-13T02:45Z	0.825	false
2019-07-13T02:30Z	0.825	false
2019-07-13T02:15Z	0.825	false
2019-07-13T02:00Z	0.825	false
2019-07-13T01:45Z	0.825	false
2019-07-13T01:30Z	0.825	false
2019-07-13T01:15Z	0.825	false
2019-07-13T01:00Z	0.825	false
2019-07-13T00:45Z	0.826	false
2019-07-13T00:30Z	0.825	false
2019-07-13T00:15Z	0.825	false
2019-07-13T00:00Z	0.825	false
2019-07-12T23:45Z	0.825	false
2019-07-12T23:30Z	0.826	false
2019-07-12T23:15Z	0.825	false
2019-07-12T23:00Z	0.825	false
2019-07-12T22:45Z	0.826	false
2019-07-12T22:30Z	0.825	false
2019-07-12T22:15Z	0.825	false
2019-07-12T22:00Z	0.825	false
2019-07-12T21:45Z	0.825	false
2019-07-12T21:30Z	0.825	false
2019-07-12T21:15Z	0.826	false
2019-07-12T21:00Z	0.825	false
2019-07-12T20:45Z	0.825	false
2019-07-12T20:30Z	0.825	false
2019-07-12T20:15Z	0.825	false
2019-07-12T20:00Z	0.825	false
2019-07-12T19:45Z	0.825	false
2019-07-12T19:30Z	0.825	false
2019-07-12T19:15Z	0.825	false
2019-07-12T19:00Z	0.824	false
2019-07-12T18:45Z	0.825	false
2019-07-12T18:30Z	0.825	false
2019-07-12T18:15Z	0.825	false
2019-07-12T18:00Z	0.824	false
2019-07-12T17:45Z	0.824	false
2019-07-12T17:30Z	0.824	false
2019-07-12T17:15Z	0.824	false
2019-07-12T17:00Z	0.824	false
2019-07-12T16:45Z	0.824	false
2019-07-12T16:30Z	0.824	false
2019-07-12T16:15Z	0.824	false
2019-07-12T16:00Z	0.824	false
2019-07-12T15:45Z	0.823	false
2019-07-12T15:30Z	0.823	false
2019-07-12T15:15Z	0.824	false
2019-07-12T15:00Z	0.823	false
2019-07-12T14:45Z	0.823	false
2019-07-12T14:30Z	0.823	false
2019-07-12T14:15Z	0.823	false
2019-07-12T14:00Z	0.822	false
2019-07-12T13:45Z	0.821	false
2019-07-12T13:30Z	0.821	false
2019-07-12T13:15Z	0.822	false
2019-07-12T13:00Z	0.822	false
2019-07-12T12:45Z	0.823	false
2019-07-12T12:30Z	0.823	false
2019-07-12T12:15Z	0.823	false
2019-07-12T12:00Z	0.824	false
2019-07-12T11:45Z	0.824	false
2019-07-12T11:30Z	0.824	false
2019-07-12T11:15Z	0.824	false
2019-07-12T11:00Z	0.823	false
2019-07-12T10:45Z	0.824	false
2019-07-12T10:30Z	0.823	false
2019-07-12T10:15Z	0.824	false
2019-07-12T10:00Z	0.823	false
2019-07-12T09:45Z	0.823	false
2019-07-12T09:30Z	0.823	false
2019-07-12T09:15Z	0.822	false
2019-07-12T09:00Z	0.822	false
2019-07-12T08:45Z	0.822	false
2019-07-12T08:30Z	0.822	false
2019-07-12T08:15Z	0.823	false
2019-07-12T08:00Z	0.823	false
2019-07-12T07:45Z	0.824	false
2019-07-12T07:30Z	0.824	false
2019-07-12T07:15Z	0.824	false
2019-07-12T07:00Z	0.825	false
2019-07-12T06:45Z	0.825	false
2019-07-12T06:30Z	0.824	false
2019-07-12T06:15Z	0.824	false
2019-07-12T06:00Z	0.825	false
2019-07-12T05:45Z	0.824	false
2019-07-12T05:30Z	0.825	false
2019-07-12T05:15Z	0.824	false
2019-07-12T05:00Z	0.824	false
2019-07-12T04:45Z	0.824	false
2019-07-12T04:30Z	0.823	false
2019-07-12T04:15Z	0.823	false
2019-07-12T04:00Z	0.822	false
2019-07-12T03:45Z	0.822	false
2019-07-12T03:30Z	0.822	false
2019-07-12T03:15Z	0.822	false
2019-07-12T03:00Z	0.821	false
2019-07-12T02:45Z	0.821	false
2019-07-12T02:30Z	0.822	false
2019-07-12T02:15Z	0.821	false
2019-07-12T02:00Z	0.821	false
2019-07-12T01:45Z	0.821	false
2019-07-12T01:30Z	0.821	false
2019-07-12T01:15Z	0.821	false
2019-07-12T01:00Z	0.821	false
2019-07-12T00:45Z	0.822	false
2019-07-12T00:30Z	0.821	false
2019-07-12T00:15Z	0.821	false
2019-07-12T00:00Z	0.821	false
2019-07-11T23:45Z	0.822	false
2019-07-11T23:30Z	0.822	false
2019-07-11T23:15Z	0.822	false
2019-07-11T23:00Z	0.822	false
2019-07-11T22:45Z	0.822	false
2019-07-11T22:30Z	0.822	false
2019-07-11T22:15Z	0.821	false
2019-07-11T22:00Z	0.821	false
2019-07-11T21:45Z	0.821	false
2019-07-11T21:30Z	0.821	false
2019-07-11T21:15Z	0.821	false
2019-07-11T21:00Z	0.821	false
2019-07-11T20:45Z	0.82	false
2019-07-11T20:30Z	0.806	false
2019-07-11T20:15Z	0.805	false
2019-07-11T20:00Z	0.805	false
2019-07-11T19:45Z	0.804	false
2019-07-11T19:30Z	0.805	false
2019-07-11T19:15Z	0.804	false
2019-07-11T19:00Z	0.805	false
2019-07-11T18:45Z	0.804	false
2019-07-11T18:30Z	0.804	false
2019-07-11T18:15Z	0.804	false
2019-07-11T18:00Z	0.802	false
2019-07-11T17:45Z	0.803	false
2019-07-11T17:30Z	0.803	false
2019-07-11T17:15Z	0.804	false
2019-07-11T17:00Z	0.804	false
2019-07-11T16:45Z	0.805	false
2019-07-11T16:30Z	0.805	false
2019-07-11T16:15Z	0.804	false
2019-07-11T16:00Z	0.806	false
2019-07-11T15:45Z	0.806	false
2019-07-11T15:30Z	0.807	false
2019-07-11T15:15Z	0.808	false
2019-07-11T15:00Z	0.808	false
2019-07-11T14:45Z	0.808	false
2019-07-11T14:30Z	0.808	false
2019-07-11T14:15Z	0.808	false
2019-07-11T14:00Z	0.809	false
2019-07-11T13:45Z	0.809	false
2019-07-11T13:30Z	0.809	false
2019-07-11T13:15Z	0.81	false
2019-07-11T13:00Z	0.808	false
2019-07-11T12:45Z	0.81	false
2019-07-11T12:30Z	0.811	false
2019-07-11T12:15Z	0.811	false
2019-07-11T12:00Z	0.811	false
2019-07-11T11:45Z	0.811	false
2019-07-11T11:30Z	0.812	false
2019-07-11T11:15Z	0.812	false
2019-07-11T11:00Z	0.812	false
2019-07-11T10:45Z	0.813	false
2019-07-11T10:30Z	0.812	false
2019-07-11T10:15Z	0.813	false
2019-07-11T10:00Z	0.814	false
2019-07-11T09:45Z	0.814	false
2019-07-11T09:30Z	0.814	false
2019-07-11T09:15Z	0.814	false
2019-07-11T09:00Z	0.814	false
2019-07-11T08:45Z	0.815	false
2019-07-11T08:30Z	0.815	false
2019-07-11T08:15Z	0.815	false
2019-07-11T08:00Z	0.816	false
2019-07-11T07:45Z	0.816	false
2019-07-11T07:30Z	0.817	false
2019-07-11T07:15Z	0.817	false
2019-07-11T07:00Z	0.817	false
2019-07-11T06:45Z	0.818	false
2019-07-11T06:30Z	0.819	false
2019-07-11T06:15Z	0.819	false
2019-07-11T06:00Z	0.819	false
2019-07-11T05:45Z	0.82	false
2019-07-11T05:30Z	0.819	false
2019-07-11T05:15Z	0.819	false
2019-07-11T05:00Z	0.82	false
2019-07-11T04:45Z	0.821	false
2019-07-11T04:30Z	0.821	false
2019-07-11T04:15Z	0.821	false
2019-07-11T04:00Z	0.82	false
2019-07-11T03:45Z	0.819	false
2019-07-11T03:30Z	0.82	false
2019-07-11T03:15Z	0.821	false
2019-07-11T03:00Z	0.82	false
2019-07-11T02:45Z	0.82	false
2019-07-11T02:30Z	0.821	false
2019-07-11T02:15Z	0.821	false
2019-07-11T02:00Z	0.821	false
2019-07-11T01:45Z	0.821	false
2019-07-11T01:30Z	0.821	false
2019-07-11T01:15Z	0.822	false
2019-07-11T01:00Z	0.821	false
2019-07-11T00:45Z	0.822	false
2019-07-11T00:30Z	0.822	false
2019-07-11T00:15Z	0.822	false

Forecast data

Key information

• Station name: London Colney
• Station ID: 7179
• River name: River Colne
• Typical range: 0.94m to 1.50m
• Highest level on record: 2.72m on 30 October 2000
• Site datum: 63.00mAOD (what does this mean?)

How are river levels measured?

The Environment agency uses a network of monitoring stations across the country. Each one has its own datum - a height in metres fixed relative to mean sea level. This height is expressed as metres above ordnance datum (mAOD). The river levels we provide for each monitoring station are all relative to its site datum.

If we didn't do this, we'd show some very high measurements, which could cause confusion. By using a local site datum, the river levels are easier to understand, especially by users familiar with the data from a particular monitoring station.

A river's height above ordnance datum can be seen by adding the site datum to the river level.

How often are river levels measured?

We use measuring stations like this one to collect water level data, usually once or twice a day. We collect data more frequently when there's a greater risk of flooding. That's why the graph might show a short time lag since the last measurement.

How might river levels affect flood risk?

Typical range

This is the usual range of river levels at this station, based on historical data.

Above typical

This means that flooding is possible because river levels at this station are currently higher than usual.
Many factors can influence the possibility of flooding - river levels are only one indicator. Always check if there's a flood warning in place at a particular location.

Below typical

This means that river levels at this station are currently lower than usual.
Drought or water management measures may be in place. Please check for the latest information on water resources and restrictions in your area.

• View nearby measuring stations

• View the flood information service for England
• View your property's long term risk of flooding

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