River level River Colne at London Colney

Latest recorded level 1.09m at 5:30am Thursday 1 October 2020.

Levels: last 5 days and next 36 hours

Now
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Measured level
Forecast level
Property flooding possible
Low lying land may flood
Highest recorded level. Hide
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Observed data

DateTime	Value	Error
2020-10-01T04:30Z	1.086	false
2020-10-01T04:15Z	1.086	false
2020-10-01T04:00Z	1.085	false
2020-10-01T03:45Z	1.087	false
2020-10-01T03:30Z	1.086	false
2020-10-01T03:15Z	1.087	false
2020-10-01T03:00Z	1.087	false
2020-10-01T02:45Z	1.087	false
2020-10-01T02:30Z	1.088	false
2020-10-01T02:15Z	1.087	false
2020-10-01T02:00Z	1.089	false
2020-10-01T01:45Z	1.089	false
2020-10-01T01:30Z	1.089	false
2020-10-01T01:15Z	1.089	false
2020-10-01T01:00Z	1.089	false
2020-10-01T00:45Z	1.089	false
2020-10-01T00:30Z	1.09	false
2020-10-01T00:15Z	1.09	false
2020-10-01T00:00Z	1.09	false
2020-09-30T23:45Z	1.091	false
2020-09-30T23:30Z	1.091	false
2020-09-30T23:15Z	1.09	false
2020-09-30T23:00Z	1.09	false
2020-09-30T22:45Z	1.091	false
2020-09-30T22:30Z	1.09	false
2020-09-30T22:15Z	1.09	false
2020-09-30T22:00Z	1.09	false
2020-09-30T21:45Z	1.09	false
2020-09-30T21:30Z	1.089	false
2020-09-30T21:15Z	1.088	false
2020-09-30T21:00Z	1.088	false
2020-09-30T20:45Z	1.088	false
2020-09-30T20:30Z	1.087	false
2020-09-30T20:15Z	1.087	false
2020-09-30T20:00Z	1.087	false
2020-09-30T19:45Z	1.086	false
2020-09-30T19:30Z	1.085	false
2020-09-30T19:15Z	1.086	false
2020-09-30T19:00Z	1.086	false
2020-09-30T18:45Z	1.085	false
2020-09-30T18:30Z	1.085	false
2020-09-30T18:15Z	1.085	false
2020-09-30T18:00Z	1.084	false
2020-09-30T17:45Z	1.085	false
2020-09-30T17:30Z	1.085	false
2020-09-30T17:15Z	1.085	false
2020-09-30T17:00Z	1.085	false
2020-09-30T16:45Z	1.084	false
2020-09-30T16:30Z	1.084	false
2020-09-30T16:15Z	1.084	false
2020-09-30T16:00Z	1.084	false
2020-09-30T15:45Z	1.086	false
2020-09-30T15:30Z	1.085	false
2020-09-30T15:15Z	1.085	false
2020-09-30T15:00Z	1.084	false
2020-09-30T14:45Z	1.085	false
2020-09-30T14:30Z	1.085	false
2020-09-30T14:15Z	1.085	false
2020-09-30T14:00Z	1.085	false
2020-09-30T13:45Z	1.085	false
2020-09-30T13:30Z	1.085	false
2020-09-30T13:15Z	1.086	false
2020-09-30T13:00Z	1.086	false
2020-09-30T12:45Z	1.085	false
2020-09-30T12:30Z	1.086	false
2020-09-30T12:15Z	1.085	false
2020-09-30T12:00Z	1.084	false
2020-09-30T11:45Z	1.085	false
2020-09-30T11:30Z	1.085	false
2020-09-30T11:15Z	1.085	false
2020-09-30T11:00Z	1.084	false
2020-09-30T10:45Z	1.085	false
2020-09-30T10:30Z	1.085	false
2020-09-30T10:15Z	1.085	false
2020-09-30T10:00Z	1.085	false
2020-09-30T09:45Z	1.085	false
2020-09-30T09:30Z	1.085	false
2020-09-30T09:15Z	1.085	false
2020-09-30T09:00Z	1.085	false
2020-09-30T08:45Z	1.086	false
2020-09-30T08:30Z	1.086	false
2020-09-30T08:15Z	1.085	false
2020-09-30T08:00Z	1.086	false
2020-09-30T07:45Z	1.086	false
2020-09-30T07:30Z	1.087	false
2020-09-30T07:15Z	1.087	false
2020-09-30T07:00Z	1.087	false
2020-09-30T06:45Z	1.087	false
2020-09-30T06:30Z	1.087	false
2020-09-30T06:15Z	1.087	false
2020-09-30T06:00Z	1.087	false
2020-09-30T05:45Z	1.087	false
2020-09-30T05:30Z	1.087	false
2020-09-30T05:15Z	1.086	false
2020-09-30T05:00Z	1.087	false
2020-09-30T04:45Z	1.087	false
2020-09-30T04:30Z	1.087	false
2020-09-30T04:15Z	1.086	false
2020-09-30T04:00Z	1.086	false
2020-09-30T03:45Z	1.087	false
2020-09-30T03:30Z	1.086	false
2020-09-30T03:15Z	1.086	false
2020-09-30T03:00Z	1.086	false
2020-09-30T02:45Z	1.086	false
2020-09-30T02:30Z	1.086	false
2020-09-30T02:15Z	1.087	false
2020-09-30T02:00Z	1.086	false
2020-09-30T01:45Z	1.086	false
2020-09-30T01:30Z	1.086	false
2020-09-30T01:15Z	1.086	false
2020-09-30T01:00Z	1.086	false
2020-09-30T00:45Z	1.086	false
2020-09-30T00:30Z	1.086	false
2020-09-30T00:15Z	1.087	false
2020-09-30T00:00Z	1.086	false
2020-09-29T23:45Z	1.087	false
2020-09-29T23:30Z	1.086	false
2020-09-29T23:15Z	1.086	false
2020-09-29T23:00Z	1.086	false
2020-09-29T22:45Z	1.086	false
2020-09-29T22:30Z	1.086	false
2020-09-29T22:15Z	1.086	false
2020-09-29T22:00Z	1.086	false
2020-09-29T21:45Z	1.085	false
2020-09-29T21:30Z	1.086	false
2020-09-29T21:15Z	1.086	false
2020-09-29T21:00Z	1.086	false
2020-09-29T20:45Z	1.086	false
2020-09-29T20:30Z	1.086	false
2020-09-29T20:15Z	1.086	false
2020-09-29T20:00Z	1.085	false
2020-09-29T19:45Z	1.085	false
2020-09-29T19:30Z	1.086	false
2020-09-29T19:15Z	1.086	false
2020-09-29T19:00Z	1.086	false
2020-09-29T18:45Z	1.087	false
2020-09-29T18:30Z	1.086	false
2020-09-29T18:15Z	1.086	false
2020-09-29T18:00Z	1.086	false
2020-09-29T17:45Z	1.087	false
2020-09-29T17:30Z	1.087	false
2020-09-29T17:15Z	1.087	false
2020-09-29T17:00Z	1.087	false
2020-09-29T16:45Z	1.088	false
2020-09-29T16:30Z	1.087	false
2020-09-29T16:15Z	1.088	false
2020-09-29T16:00Z	1.088	false
2020-09-29T15:45Z	1.088	false
2020-09-29T15:30Z	1.088	false
2020-09-29T15:15Z	1.088	false
2020-09-29T15:00Z	1.088	false
2020-09-29T14:45Z	1.088	false
2020-09-29T14:30Z	1.088	false
2020-09-29T14:15Z	1.089	false
2020-09-29T14:00Z	1.088	false
2020-09-29T13:45Z	1.089	false
2020-09-29T13:30Z	1.089	false
2020-09-29T13:15Z	1.09	false
2020-09-29T13:00Z	1.089	false
2020-09-29T12:45Z	1.089	false
2020-09-29T12:30Z	1.089	false
2020-09-29T12:15Z	1.09	false
2020-09-29T12:00Z	1.09	false
2020-09-29T11:45Z	1.09	false
2020-09-29T11:30Z	1.09	false
2020-09-29T11:15Z	1.092	false
2020-09-29T11:00Z	1.092	false
2020-09-29T10:45Z	1.091	false
2020-09-29T10:30Z	1.091	false
2020-09-29T10:15Z	1.091	false
2020-09-29T10:00Z	1.092	false
2020-09-29T09:45Z	1.093	false
2020-09-29T09:30Z	1.092	false
2020-09-29T09:15Z	1.092	false
2020-09-29T09:00Z	1.092	false
2020-09-29T08:45Z	1.092	false
2020-09-29T08:30Z	1.093	false
2020-09-29T08:15Z	1.094	false
2020-09-29T08:00Z	1.094	false
2020-09-29T07:45Z	1.093	false
2020-09-29T07:30Z	1.093	false
2020-09-29T07:15Z	1.094	false
2020-09-29T07:00Z	1.093	false
2020-09-29T06:45Z	1.093	false
2020-09-29T06:30Z	1.093	false
2020-09-29T06:15Z	1.093	false
2020-09-29T06:00Z	1.093	false
2020-09-29T05:45Z	1.093	false
2020-09-29T05:30Z	1.093	false
2020-09-29T05:15Z	1.093	false
2020-09-29T05:00Z	1.092	false
2020-09-29T04:45Z	1.092	false
2020-09-29T04:30Z	1.092	false
2020-09-29T04:15Z	1.092	false
2020-09-29T04:00Z	1.092	false
2020-09-29T03:45Z	1.092	false
2020-09-29T03:30Z	1.092	false
2020-09-29T03:15Z	1.092	false
2020-09-29T03:00Z	1.092	false
2020-09-29T02:45Z	1.092	false
2020-09-29T02:30Z	1.091	false
2020-09-29T02:15Z	1.092	false
2020-09-29T02:00Z	1.092	false
2020-09-29T01:45Z	1.091	false
2020-09-29T01:30Z	1.091	false
2020-09-29T01:15Z	1.091	false
2020-09-29T01:00Z	1.091	false
2020-09-29T00:45Z	1.091	false
2020-09-29T00:30Z	1.091	false
2020-09-29T00:15Z	1.091	false
2020-09-29T00:00Z	1.091	false
2020-09-28T23:45Z	1.091	false
2020-09-28T23:30Z	1.09	false
2020-09-28T23:15Z	1.091	false
2020-09-28T23:00Z	1.091	false
2020-09-28T22:45Z	1.091	false
2020-09-28T22:30Z	1.091	false
2020-09-28T22:15Z	1.091	false
2020-09-28T22:00Z	1.091	false
2020-09-28T21:45Z	1.092	false
2020-09-28T21:30Z	1.092	false
2020-09-28T21:15Z	1.092	false
2020-09-28T21:00Z	1.093	false
2020-09-28T20:45Z	1.092	false
2020-09-28T20:30Z	1.092	false
2020-09-28T20:15Z	1.093	false
2020-09-28T20:00Z	1.093	false
2020-09-28T19:45Z	1.093	false
2020-09-28T19:30Z	1.092	false
2020-09-28T19:15Z	1.092	false
2020-09-28T19:00Z	1.092	false
2020-09-28T18:45Z	1.092	false
2020-09-28T18:30Z	1.092	false
2020-09-28T18:15Z	1.092	false
2020-09-28T18:00Z	1.093	false
2020-09-28T17:45Z	1.093	false
2020-09-28T17:30Z	1.093	false
2020-09-28T17:15Z	1.093	false
2020-09-28T17:00Z	1.093	false
2020-09-28T16:45Z	1.093	false
2020-09-28T16:30Z	1.093	false
2020-09-28T16:15Z	1.093	false
2020-09-28T16:00Z	1.093	false
2020-09-28T15:45Z	1.094	false
2020-09-28T15:30Z	1.094	false
2020-09-28T15:15Z	1.094	false
2020-09-28T15:00Z	1.094	false
2020-09-28T14:45Z	1.094	false
2020-09-28T14:30Z	1.094	false
2020-09-28T14:15Z	1.094	false
2020-09-28T14:00Z	1.094	false
2020-09-28T13:45Z	1.094	false
2020-09-28T13:30Z	1.094	false
2020-09-28T13:15Z	1.094	false
2020-09-28T13:00Z	1.093	false
2020-09-28T12:45Z	1.093	false
2020-09-28T12:30Z	1.093	false
2020-09-28T12:15Z	1.094	false
2020-09-28T12:00Z	1.094	false
2020-09-28T11:45Z	1.095	false
2020-09-28T11:30Z	1.095	false
2020-09-28T11:15Z	1.095	false
2020-09-28T11:00Z	1.095	false
2020-09-28T10:45Z	1.095	false
2020-09-28T10:30Z	1.095	false
2020-09-28T10:15Z	1.095	false
2020-09-28T10:00Z	1.095	false
2020-09-28T09:45Z	1.095	false
2020-09-28T09:30Z	1.095	false
2020-09-28T09:15Z	1.096	false
2020-09-28T09:00Z	1.095	false
2020-09-28T08:45Z	1.095	false
2020-09-28T08:30Z	1.096	false
2020-09-28T08:15Z	1.096	false
2020-09-28T08:00Z	1.097	false
2020-09-28T07:45Z	1.097	false
2020-09-28T07:30Z	1.097	false
2020-09-28T07:15Z	1.096	false
2020-09-28T07:00Z	1.096	false
2020-09-28T06:45Z	1.096	false
2020-09-28T06:30Z	1.096	false
2020-09-28T06:15Z	1.096	false
2020-09-28T06:00Z	1.096	false
2020-09-28T05:45Z	1.096	false
2020-09-28T05:30Z	1.096	false
2020-09-28T05:15Z	1.096	false
2020-09-28T05:00Z	1.097	false
2020-09-28T04:45Z	1.096	false
2020-09-28T04:30Z	1.096	false
2020-09-28T04:15Z	1.096	false
2020-09-28T04:00Z	1.096	false
2020-09-28T03:45Z	1.096	false
2020-09-28T03:30Z	1.096	false
2020-09-28T03:15Z	1.096	false
2020-09-28T03:00Z	1.096	false
2020-09-28T02:45Z	1.096	false
2020-09-28T02:30Z	1.097	false
2020-09-28T02:15Z	1.096	false
2020-09-28T02:00Z	1.096	false
2020-09-28T01:45Z	1.096	false
2020-09-28T01:30Z	1.096	false
2020-09-28T01:15Z	1.096	false
2020-09-28T01:00Z	1.096	false
2020-09-28T00:45Z	1.096	false
2020-09-28T00:30Z	1.096	false
2020-09-28T00:15Z	1.096	false
2020-09-28T00:00Z	1.096	false
2020-09-27T23:45Z	1.097	false
2020-09-27T23:30Z	1.097	false
2020-09-27T23:15Z	1.098	false
2020-09-27T23:00Z	1.097	false
2020-09-27T22:45Z	1.097	false
2020-09-27T22:30Z	1.097	false
2020-09-27T22:15Z	1.097	false
2020-09-27T22:00Z	1.096	false
2020-09-27T21:45Z	1.096	false
2020-09-27T21:30Z	1.096	false
2020-09-27T21:15Z	1.096	false
2020-09-27T21:00Z	1.096	false
2020-09-27T20:45Z	1.097	false
2020-09-27T20:30Z	1.097	false
2020-09-27T20:15Z	1.098	false
2020-09-27T20:00Z	1.098	false
2020-09-27T19:45Z	1.098	false
2020-09-27T19:30Z	1.097	false
2020-09-27T19:15Z	1.097	false
2020-09-27T19:00Z	1.097	false
2020-09-27T18:45Z	1.097	false
2020-09-27T18:30Z	1.097	false
2020-09-27T18:15Z	1.097	false
2020-09-27T18:00Z	1.097	false
2020-09-27T17:45Z	1.098	false
2020-09-27T17:30Z	1.097	false
2020-09-27T17:15Z	1.097	false
2020-09-27T17:00Z	1.096	false
2020-09-27T16:45Z	1.096	false
2020-09-27T16:30Z	1.096	false
2020-09-27T16:15Z	1.097	false
2020-09-27T16:00Z	1.096	false
2020-09-27T15:45Z	1.096	false
2020-09-27T15:30Z	1.096	false
2020-09-27T15:15Z	1.096	false
2020-09-27T15:00Z	1.096	false
2020-09-27T14:45Z	1.096	false
2020-09-27T14:30Z	1.096	false
2020-09-27T14:15Z	1.096	false
2020-09-27T14:00Z	1.096	false
2020-09-27T13:45Z	1.096	false
2020-09-27T13:30Z	1.096	false
2020-09-27T13:15Z	1.096	false
2020-09-27T13:00Z	1.096	false
2020-09-27T12:45Z	1.096	false
2020-09-27T12:30Z	1.096	false
2020-09-27T12:15Z	1.096	false
2020-09-27T12:00Z	1.096	false
2020-09-27T11:45Z	1.096	false
2020-09-27T11:30Z	1.096	false
2020-09-27T11:15Z	1.097	false
2020-09-27T11:00Z	1.097	false
2020-09-27T10:45Z	1.097	false
2020-09-27T10:30Z	1.097	false
2020-09-27T10:15Z	1.096	false
2020-09-27T10:00Z	1.097	false
2020-09-27T09:45Z	1.097	false
2020-09-27T09:30Z	1.097	false
2020-09-27T09:15Z	1.097	false
2020-09-27T09:00Z	1.097	false
2020-09-27T08:45Z	1.097	false
2020-09-27T08:30Z	1.097	false
2020-09-27T08:15Z	1.098	false
2020-09-27T08:00Z	1.097	false
2020-09-27T07:45Z	1.098	false
2020-09-27T07:30Z	1.098	false
2020-09-27T07:15Z	1.098	false
2020-09-27T07:00Z	1.098	false
2020-09-27T06:45Z	1.099	false
2020-09-27T06:30Z	1.099	false
2020-09-27T06:15Z	1.099	false
2020-09-27T06:00Z	1.099	false
2020-09-27T05:45Z	1.099	false
2020-09-27T05:30Z	1.099	false
2020-09-27T05:15Z	1.099	false
2020-09-27T05:00Z	1.098	false
2020-09-27T04:45Z	1.098	false
2020-09-27T04:30Z	1.099	false
2020-09-27T04:15Z	1.099	false
2020-09-27T04:00Z	1.099	false
2020-09-27T03:45Z	1.099	false
2020-09-27T03:30Z	1.099	false
2020-09-27T03:15Z	1.099	false
2020-09-27T03:00Z	1.1	false
2020-09-27T02:45Z	1.1	false
2020-09-27T02:30Z	1.099	false
2020-09-27T02:15Z	1.1	false
2020-09-27T02:00Z	1.099	false
2020-09-27T01:45Z	1.1	false
2020-09-27T01:30Z	1.1	false
2020-09-27T01:15Z	1.1	false
2020-09-27T01:00Z	1.1	false
2020-09-27T00:45Z	1.1	false
2020-09-27T00:30Z	1.1	false
2020-09-27T00:15Z	1.1	false
2020-09-27T00:00Z	1.1	false
2020-09-26T23:45Z	1.1	false
2020-09-26T23:30Z	1.1	false
2020-09-26T23:15Z	1.1	false
2020-09-26T23:00Z	1.1	false
2020-09-26T22:45Z	1.1	false
2020-09-26T22:30Z	1.1	false
2020-09-26T22:15Z	1.101	false
2020-09-26T22:00Z	1.1	false
2020-09-26T21:45Z	1.101	false
2020-09-26T21:30Z	1.101	false
2020-09-26T21:15Z	1.1	false
2020-09-26T21:00Z	1.101	false
2020-09-26T20:45Z	1.101	false
2020-09-26T20:30Z	1.101	false
2020-09-26T20:15Z	1.1	false
2020-09-26T20:00Z	1.101	false
2020-09-26T19:45Z	1.101	false
2020-09-26T19:30Z	1.101	false
2020-09-26T19:15Z	1.101	false
2020-09-26T19:00Z	1.101	false
2020-09-26T18:45Z	1.101	false
2020-09-26T18:30Z	1.101	false
2020-09-26T18:15Z	1.1	false
2020-09-26T18:00Z	1.1	false
2020-09-26T17:45Z	1.1	false
2020-09-26T17:30Z	1.1	false
2020-09-26T17:15Z	1.1	false
2020-09-26T17:00Z	1.1	false
2020-09-26T16:45Z	1.1	false
2020-09-26T16:30Z	1.1	false
2020-09-26T16:15Z	1.1	false
2020-09-26T16:00Z	1.1	false
2020-09-26T15:45Z	1.099	false
2020-09-26T15:30Z	1.099	false
2020-09-26T15:15Z	1.098	false
2020-09-26T15:00Z	1.099	false
2020-09-26T14:45Z	1.098	false
2020-09-26T14:30Z	1.098	false
2020-09-26T14:15Z	1.098	false
2020-09-26T14:00Z	1.098	false
2020-09-26T13:45Z	1.098	false
2020-09-26T13:30Z	1.098	false
2020-09-26T13:15Z	1.098	false
2020-09-26T13:00Z	1.098	false
2020-09-26T12:45Z	1.098	false
2020-09-26T12:30Z	1.098	false
2020-09-26T12:15Z	1.098	false
2020-09-26T12:00Z	1.098	false
2020-09-26T11:45Z	1.098	false
2020-09-26T11:30Z	1.098	false
2020-09-26T11:15Z	1.099	false
2020-09-26T11:00Z	1.099	false
2020-09-26T10:45Z	1.099	false
2020-09-26T10:30Z	1.099	false
2020-09-26T10:15Z	1.1	false
2020-09-26T10:00Z	1.1	false
2020-09-26T09:45Z	1.1	false
2020-09-26T09:30Z	1.1	false
2020-09-26T09:15Z	1.1	false
2020-09-26T09:00Z	1.1	false
2020-09-26T08:45Z	1.1	false
2020-09-26T08:30Z	1.101	false
2020-09-26T08:15Z	1.1	false
2020-09-26T08:00Z	1.1	false
2020-09-26T07:45Z	1.1	false
2020-09-26T07:30Z	1.1	false
2020-09-26T07:15Z	1.1	false
2020-09-26T07:00Z	1.099	false
2020-09-26T06:45Z	1.101	false
2020-09-26T06:30Z	1.101	false
2020-09-26T06:15Z	1.1	false
2020-09-26T06:00Z	1.1	false
2020-09-26T05:45Z	1.1	false
2020-09-26T05:30Z	1.1	false
2020-09-26T05:15Z	1.1	false
2020-09-26T05:00Z	1.1	false
2020-09-26T04:45Z	1.1	false

Forecast data

October 1st 2020, 5:30:00 am	1.084
October 1st 2020, 5:45:00 am	1.084
October 1st 2020, 6:00:00 am	1.084
October 1st 2020, 6:15:00 am	1.084
October 1st 2020, 6:30:00 am	1.084
October 1st 2020, 6:45:00 am	1.084
October 1st 2020, 7:00:00 am	1.084
October 1st 2020, 7:15:00 am	1.084
October 1st 2020, 7:30:00 am	1.084
October 1st 2020, 7:45:00 am	1.084
October 1st 2020, 8:00:00 am	1.084
October 1st 2020, 8:15:00 am	1.084
October 1st 2020, 8:30:00 am	1.084
October 1st 2020, 8:45:00 am	1.084
October 1st 2020, 9:00:00 am	1.084
October 1st 2020, 9:15:00 am	1.084
October 1st 2020, 9:30:00 am	1.084
October 1st 2020, 9:45:00 am	1.084
October 1st 2020, 10:00:00 am	1.084
October 1st 2020, 10:15:00 am	1.084
October 1st 2020, 10:30:00 am	1.084
October 1st 2020, 10:45:00 am	1.084
October 1st 2020, 11:00:00 am	1.084
October 1st 2020, 11:15:00 am	1.084
October 1st 2020, 11:30:00 am	1.084
October 1st 2020, 11:45:00 am	1.084
October 1st 2020, 12:00:00 pm	1.084
October 1st 2020, 12:15:00 pm	1.084
October 1st 2020, 12:30:00 pm	1.084
October 1st 2020, 12:45:00 pm	1.084
October 1st 2020, 1:00:00 pm	1.084
October 1st 2020, 1:15:00 pm	1.084
October 1st 2020, 1:30:00 pm	1.084
October 1st 2020, 1:45:00 pm	1.084
October 1st 2020, 2:00:00 pm	1.084
October 1st 2020, 2:15:00 pm	1.084
October 1st 2020, 2:30:00 pm	1.084
October 1st 2020, 2:45:00 pm	1.084
October 1st 2020, 3:00:00 pm	1.084
October 1st 2020, 3:15:00 pm	1.084
October 1st 2020, 3:30:00 pm	1.084
October 1st 2020, 3:45:00 pm	1.084
October 1st 2020, 4:00:00 pm	1.084
October 1st 2020, 4:15:00 pm	1.084
October 1st 2020, 4:30:00 pm	1.084
October 1st 2020, 4:45:00 pm	1.084
October 1st 2020, 5:00:00 pm	1.084
October 1st 2020, 5:15:00 pm	1.084
October 1st 2020, 5:30:00 pm	1.084
October 1st 2020, 5:45:00 pm	1.084
October 1st 2020, 6:00:00 pm	1.084
October 1st 2020, 6:15:00 pm	1.084
October 1st 2020, 6:30:00 pm	1.084
October 1st 2020, 6:45:00 pm	1.084
October 1st 2020, 7:00:00 pm	1.084
October 1st 2020, 7:15:00 pm	1.084
October 1st 2020, 7:30:00 pm	1.084
October 1st 2020, 7:45:00 pm	1.084
October 1st 2020, 8:00:00 pm	1.084
October 1st 2020, 8:15:00 pm	1.084
October 1st 2020, 8:30:00 pm	1.084
October 1st 2020, 8:45:00 pm	1.084
October 1st 2020, 9:00:00 pm	1.084
October 1st 2020, 9:15:00 pm	1.084
October 1st 2020, 9:30:00 pm	1.084
October 1st 2020, 9:45:00 pm	1.084
October 1st 2020, 10:00:00 pm	1.084
October 1st 2020, 10:15:00 pm	1.084
October 1st 2020, 10:30:00 pm	1.084
October 1st 2020, 10:45:00 pm	1.084
October 1st 2020, 11:00:00 pm	1.084
October 1st 2020, 11:15:00 pm	1.084
October 1st 2020, 11:30:00 pm	1.084
October 1st 2020, 11:45:00 pm	1.084
October 2nd 2020, 12:00:00 am	1.084
October 2nd 2020, 12:15:00 am	1.084
October 2nd 2020, 12:30:00 am	1.084
October 2nd 2020, 12:45:00 am	1.084
October 2nd 2020, 1:00:00 am	1.084
October 2nd 2020, 1:15:00 am	1.084
October 2nd 2020, 1:30:00 am	1.084
October 2nd 2020, 1:45:00 am	1.084
October 2nd 2020, 2:00:00 am	1.084
October 2nd 2020, 2:15:00 am	1.084
October 2nd 2020, 2:30:00 am	1.084
October 2nd 2020, 2:45:00 am	1.084
October 2nd 2020, 3:00:00 am	1.084
October 2nd 2020, 3:15:00 am	1.084
October 2nd 2020, 3:30:00 am	1.084
October 2nd 2020, 3:45:00 am	1.084
October 2nd 2020, 4:00:00 am	1.084
October 2nd 2020, 4:15:00 am	1.084
October 2nd 2020, 4:30:00 am	1.084
October 2nd 2020, 4:45:00 am	1.084
October 2nd 2020, 5:00:00 am	1.084
October 2nd 2020, 5:15:00 am	1.084
October 2nd 2020, 5:30:00 am	1.084
October 2nd 2020, 5:45:00 am	1.084
October 2nd 2020, 6:00:00 am	1.084
October 2nd 2020, 6:15:00 am	1.084
October 2nd 2020, 6:30:00 am	1.084
October 2nd 2020, 6:45:00 am	1.084
October 2nd 2020, 7:00:00 am	1.084
October 2nd 2020, 7:15:00 am	1.084
October 2nd 2020, 7:30:00 am	1.084
October 2nd 2020, 7:45:00 am	1.084
October 2nd 2020, 8:00:00 am	1.084
October 2nd 2020, 8:15:00 am	1.084
October 2nd 2020, 8:30:00 am	1.084
October 2nd 2020, 8:45:00 am	1.084
October 2nd 2020, 9:00:00 am	1.084
October 2nd 2020, 9:15:00 am	1.084
October 2nd 2020, 9:30:00 am	1.084
October 2nd 2020, 9:45:00 am	1.084
October 2nd 2020, 10:00:00 am	1.084
October 2nd 2020, 10:15:00 am	1.084
October 2nd 2020, 10:30:00 am	1.084
October 2nd 2020, 10:45:00 am	1.084
October 2nd 2020, 11:00:00 am	1.084
October 2nd 2020, 11:15:00 am	1.084
October 2nd 2020, 11:30:00 am	1.084
October 2nd 2020, 11:45:00 am	1.084
October 2nd 2020, 12:00:00 pm	1.084
October 2nd 2020, 12:15:00 pm	1.084
October 2nd 2020, 12:30:00 pm	1.084
October 2nd 2020, 12:45:00 pm	1.084
October 2nd 2020, 1:00:00 pm	1.084
October 2nd 2020, 1:15:00 pm	1.084
October 2nd 2020, 1:30:00 pm	1.084
October 2nd 2020, 1:45:00 pm	1.085
October 2nd 2020, 2:00:00 pm	1.085
October 2nd 2020, 2:15:00 pm	1.085
October 2nd 2020, 2:30:00 pm	1.086
October 2nd 2020, 2:45:00 pm	1.087
October 2nd 2020, 3:00:00 pm	1.088
October 2nd 2020, 3:15:00 pm	1.089
October 2nd 2020, 3:30:00 pm	1.091
October 2nd 2020, 3:45:00 pm	1.094
October 2nd 2020, 4:00:00 pm	1.097
October 2nd 2020, 4:15:00 pm	1.102
October 2nd 2020, 4:30:00 pm	1.108
October 2nd 2020, 4:45:00 pm	1.114
October 2nd 2020, 5:00:00 pm	1.121
October 2nd 2020, 5:15:00 pm	1.128
October 2nd 2020, 5:30:00 pm	1.135

Forecasts contain uncertainty and can change frequently. For the latest information, always check for up to date flood warnings and alerts in your area.

Key information

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?

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.

How are forecasts produced?

The forecasts shown here are computer models based on technical data, local conditions and Met Office rainfall predictions and may contain uncertainty. Because they’re linked to the weather, forecasts can change quickly. We update them more frequently if the risk of flooding increases.

When we issue flood warnings and alerts we assess many factors including these forecasts, local conditions, tides and the weather forecast.

Flood warnings and alerts can still be issued even if water levels at a measuring station are forecast to remain within its typical range. For the latest information, always check for up to date flood warnings and alerts.

What effect could these levels have on nearby areas?

Typical range at this location

0.94m to 1.85m.

Above 1.85m flooding of low-lying land may occur in these areas

Upper River Colne and Radlett Brook

Above 2.30m some property flooding may occur in these areas

River Colne at London Colney

Highest forecast level at this location

The highest level forecast in the next 36 hours is 1.14m at 5:30pm Friday 2 October 2020.

Highest level recorded at this location

2.72m on 30 October 2000

View nearby measuring stations