River level River Colne at London Colney

Latest recorded level 1.12m at 1:00am Sunday 5 April 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
2020-04-05T00:00Z	1.118	false
2020-04-04T23:45Z	1.118	false
2020-04-04T23:30Z	1.118	false
2020-04-04T23:15Z	1.118	false
2020-04-04T23:00Z	1.119	false
2020-04-04T22:45Z	1.118	false
2020-04-04T22:30Z	1.118	false
2020-04-04T22:15Z	1.118	false
2020-04-04T22:00Z	1.118	false
2020-04-04T21:45Z	1.118	false
2020-04-04T21:30Z	1.118	false
2020-04-04T21:15Z	1.118	false
2020-04-04T21:00Z	1.118	false
2020-04-04T20:45Z	1.118	false
2020-04-04T20:30Z	1.118	false
2020-04-04T20:15Z	1.118	false
2020-04-04T20:00Z	1.118	false
2020-04-04T19:45Z	1.118	false
2020-04-04T19:30Z	1.118	false
2020-04-04T19:15Z	1.118	false
2020-04-04T19:00Z	1.118	false
2020-04-04T18:45Z	1.118	false
2020-04-04T18:30Z	1.118	false
2020-04-04T18:15Z	1.117	false
2020-04-04T18:00Z	1.117	false
2020-04-04T17:45Z	1.117	false
2020-04-04T17:30Z	1.117	false
2020-04-04T17:15Z	1.116	false
2020-04-04T17:00Z	1.116	false
2020-04-04T16:45Z	1.116	false
2020-04-04T16:30Z	1.116	false
2020-04-04T16:15Z	1.116	false
2020-04-04T16:00Z	1.115	false
2020-04-04T15:45Z	1.115	false
2020-04-04T15:30Z	1.115	false
2020-04-04T15:15Z	1.114	false
2020-04-04T15:00Z	1.115	false
2020-04-04T14:45Z	1.115	false
2020-04-04T14:30Z	1.115	false
2020-04-04T14:15Z	1.115	false
2020-04-04T14:00Z	1.115	false
2020-04-04T13:45Z	1.115	false
2020-04-04T13:30Z	1.115	false
2020-04-04T13:15Z	1.115	false
2020-04-04T13:00Z	1.115	false
2020-04-04T12:45Z	1.115	false
2020-04-04T12:30Z	1.115	false
2020-04-04T12:15Z	1.116	false
2020-04-04T12:00Z	1.115	false
2020-04-04T11:45Z	1.116	false
2020-04-04T11:30Z	1.116	false
2020-04-04T11:15Z	1.116	false
2020-04-04T11:00Z	1.116	false
2020-04-04T10:45Z	1.116	false
2020-04-04T10:30Z	1.116	false
2020-04-04T10:15Z	1.116	false
2020-04-04T10:00Z	1.116	false
2020-04-04T09:45Z	1.116	false
2020-04-04T09:30Z	1.116	false
2020-04-04T09:15Z	1.117	false
2020-04-04T09:00Z	1.117	false
2020-04-04T08:45Z	1.117	false
2020-04-04T08:30Z	1.118	false
2020-04-04T08:15Z	1.118	false
2020-04-04T08:00Z	1.117	false
2020-04-04T07:45Z	1.118	false
2020-04-04T07:30Z	1.117	false
2020-04-04T07:15Z	1.118	false
2020-04-04T07:00Z	1.118	false
2020-04-04T06:45Z	1.118	false
2020-04-04T06:30Z	1.118	false
2020-04-04T06:15Z	1.118	false
2020-04-04T06:00Z	1.117	false
2020-04-04T05:45Z	1.117	false
2020-04-04T05:30Z	1.118	false
2020-04-04T05:15Z	1.118	false
2020-04-04T05:00Z	1.117	false
2020-04-04T04:45Z	1.118	false
2020-04-04T04:30Z	1.118	false
2020-04-04T04:15Z	1.117	false
2020-04-04T04:00Z	1.116	false
2020-04-04T03:45Z	1.117	false
2020-04-04T03:30Z	1.118	false
2020-04-04T03:15Z	1.117	false
2020-04-04T03:00Z	1.117	false
2020-04-04T02:45Z	1.118	false
2020-04-04T02:30Z	1.118	false
2020-04-04T02:15Z	1.117	false
2020-04-04T02:00Z	1.117	false
2020-04-04T01:45Z	1.117	false
2020-04-04T01:30Z	1.117	false
2020-04-04T01:15Z	1.116	false
2020-04-04T01:00Z	1.117	false
2020-04-04T00:45Z	1.116	false
2020-04-04T00:30Z	1.117	false
2020-04-04T00:15Z	1.117	false
2020-04-04T00:00Z	1.117	false
2020-04-03T23:45Z	1.117	false
2020-04-03T23:30Z	1.117	false
2020-04-03T23:15Z	1.118	false
2020-04-03T23:00Z	1.118	false
2020-04-03T22:45Z	1.117	false
2020-04-03T22:30Z	1.117	false
2020-04-03T22:15Z	1.118	false
2020-04-03T22:00Z	1.118	false
2020-04-03T21:45Z	1.118	false
2020-04-03T21:30Z	1.118	false
2020-04-03T21:15Z	1.117	false
2020-04-03T21:00Z	1.117	false
2020-04-03T20:45Z	1.117	false
2020-04-03T20:30Z	1.117	false
2020-04-03T20:15Z	1.117	false
2020-04-03T20:00Z	1.118	false
2020-04-03T19:45Z	1.117	false
2020-04-03T19:30Z	1.117	false
2020-04-03T19:15Z	1.118	false
2020-04-03T19:00Z	1.118	false
2020-04-03T18:45Z	1.116	false
2020-04-03T18:30Z	1.116	false
2020-04-03T18:15Z	1.115	false
2020-04-03T18:00Z	1.116	false
2020-04-03T17:45Z	1.116	false
2020-04-03T17:30Z	1.116	false
2020-04-03T17:15Z	1.116	false
2020-04-03T17:00Z	1.116	false
2020-04-03T16:45Z	1.116	false
2020-04-03T16:30Z	1.116	false
2020-04-03T16:15Z	1.117	false
2020-04-03T16:00Z	1.116	false
2020-04-03T15:45Z	1.117	false
2020-04-03T15:30Z	1.117	false
2020-04-03T15:15Z	1.117	false
2020-04-03T15:00Z	1.117	false
2020-04-03T14:45Z	1.118	false
2020-04-03T14:30Z	1.117	false
2020-04-03T14:15Z	1.118	false
2020-04-03T14:00Z	1.118	false
2020-04-03T13:45Z	1.118	false
2020-04-03T13:30Z	1.119	false
2020-04-03T13:15Z	1.119	false
2020-04-03T13:00Z	1.12	false
2020-04-03T12:45Z	1.121	false
2020-04-03T12:30Z	1.12	false
2020-04-03T12:15Z	1.121	false
2020-04-03T12:00Z	1.121	false
2020-04-03T11:45Z	1.122	false
2020-04-03T11:30Z	1.123	false
2020-04-03T11:15Z	1.125	false
2020-04-03T11:00Z	1.127	false
2020-04-03T10:45Z	1.128	false
2020-04-03T10:30Z	1.128	false
2020-04-03T10:15Z	1.129	false
2020-04-03T10:00Z	1.129	false
2020-04-03T09:45Z	1.13	false
2020-04-03T09:30Z	1.132	false
2020-04-03T09:15Z	1.135	false
2020-04-03T09:00Z	1.137	false
2020-04-03T08:45Z	1.139	false
2020-04-03T08:30Z	1.141	false
2020-04-03T08:15Z	1.143	false
2020-04-03T08:00Z	1.145	false
2020-04-03T07:45Z	1.147	false
2020-04-03T07:30Z	1.148	false
2020-04-03T07:15Z	1.149	false
2020-04-03T07:00Z	1.149	false
2020-04-03T06:45Z	1.148	false
2020-04-03T06:30Z	1.148	false
2020-04-03T06:15Z	1.148	false
2020-04-03T06:00Z	1.148	false
2020-04-03T05:45Z	1.148	false
2020-04-03T05:30Z	1.148	false
2020-04-03T05:15Z	1.148	false
2020-04-03T05:00Z	1.148	false
2020-04-03T04:45Z	1.148	false
2020-04-03T04:30Z	1.148	false
2020-04-03T04:15Z	1.148	false
2020-04-03T04:00Z	1.148	false
2020-04-03T03:45Z	1.148	false
2020-04-03T03:30Z	1.147	false
2020-04-03T03:15Z	1.148	false
2020-04-03T03:00Z	1.147	false
2020-04-03T02:45Z	1.147	false
2020-04-03T02:30Z	1.147	false
2020-04-03T02:15Z	1.147	false
2020-04-03T02:00Z	1.147	false
2020-04-03T01:45Z	1.147	false
2020-04-03T01:30Z	1.147	false
2020-04-03T01:15Z	1.147	false
2020-04-03T01:00Z	1.147	false
2020-04-03T00:45Z	1.147	false
2020-04-03T00:30Z	1.147	false
2020-04-03T00:15Z	1.147	false
2020-04-03T00:00Z	1.147	false
2020-04-02T23:45Z	1.147	false
2020-04-02T23:30Z	1.147	false
2020-04-02T23:15Z	1.147	false
2020-04-02T23:00Z	1.147	false
2020-04-02T22:45Z	1.147	false
2020-04-02T22:30Z	1.147	false
2020-04-02T22:15Z	1.147	false
2020-04-02T22:00Z	1.147	false
2020-04-02T21:45Z	1.147	false
2020-04-02T21:30Z	1.147	false
2020-04-02T21:15Z	1.147	false
2020-04-02T21:00Z	1.147	false
2020-04-02T20:45Z	1.147	false
2020-04-02T20:30Z	1.146	false
2020-04-02T20:15Z	1.146	false
2020-04-02T20:00Z	1.146	false
2020-04-02T19:45Z	1.146	false
2020-04-02T19:30Z	1.146	false
2020-04-02T19:15Z	1.146	false
2020-04-02T19:00Z	1.146	false
2020-04-02T18:45Z	1.146	false
2020-04-02T18:30Z	1.146	false
2020-04-02T18:15Z	1.145	false
2020-04-02T18:00Z	1.146	false
2020-04-02T17:45Z	1.145	false
2020-04-02T17:30Z	1.145	false
2020-04-02T17:15Z	1.145	false
2020-04-02T17:00Z	1.144	false
2020-04-02T16:45Z	1.145	false
2020-04-02T16:30Z	1.144	false
2020-04-02T16:15Z	1.143	false
2020-04-02T16:00Z	1.142	false
2020-04-02T15:45Z	1.143	false
2020-04-02T15:30Z	1.143	false
2020-04-02T15:15Z	1.142	false
2020-04-02T15:00Z	1.142	false
2020-04-02T14:45Z	1.142	false
2020-04-02T14:30Z	1.142	false
2020-04-02T14:15Z	1.142	false
2020-04-02T14:00Z	1.143	false
2020-04-02T13:45Z	1.143	false
2020-04-02T13:30Z	1.143	false
2020-04-02T13:15Z	1.142	false
2020-04-02T13:00Z	1.142	false
2020-04-02T12:45Z	1.142	false
2020-04-02T12:30Z	1.141	false
2020-04-02T12:15Z	1.142	false
2020-04-02T12:00Z	1.141	false
2020-04-02T11:45Z	1.141	false
2020-04-02T11:30Z	1.14	false
2020-04-02T11:15Z	1.141	false
2020-04-02T11:00Z	1.141	false
2020-04-02T10:45Z	1.139	false
2020-04-02T10:30Z	1.14	false
2020-04-02T10:15Z	1.139	false
2020-04-02T10:00Z	1.138	false
2020-04-02T09:45Z	1.138	false
2020-04-02T09:30Z	1.138	false
2020-04-02T09:15Z	1.138	false
2020-04-02T09:00Z	1.137	false
2020-04-02T08:45Z	1.137	false
2020-04-02T08:30Z	1.137	false
2020-04-02T08:15Z	1.136	false
2020-04-02T08:00Z	1.136	false
2020-04-02T07:45Z	1.136	false
2020-04-02T07:30Z	1.136	false
2020-04-02T07:15Z	1.136	false
2020-04-02T07:00Z	1.136	false
2020-04-02T06:45Z	1.136	false
2020-04-02T06:30Z	1.136	false
2020-04-02T06:15Z	1.136	false
2020-04-02T06:00Z	1.136	false
2020-04-02T05:45Z	1.136	false
2020-04-02T05:30Z	1.136	false
2020-04-02T05:15Z	1.136	false
2020-04-02T05:00Z	1.136	false
2020-04-02T04:45Z	1.135	false
2020-04-02T04:30Z	1.135	false
2020-04-02T04:15Z	1.135	false
2020-04-02T04:00Z	1.135	false
2020-04-02T03:45Z	1.135	false
2020-04-02T03:30Z	1.135	false
2020-04-02T03:15Z	1.135	false
2020-04-02T03:00Z	1.135	false
2020-04-02T02:45Z	1.135	false
2020-04-02T02:30Z	1.135	false
2020-04-02T02:15Z	1.135	false
2020-04-02T02:00Z	1.135	false
2020-04-02T01:45Z	1.135	false
2020-04-02T01:30Z	1.135	false
2020-04-02T01:15Z	1.135	false
2020-04-02T01:00Z	1.135	false
2020-04-02T00:45Z	1.135	false
2020-04-02T00:30Z	1.135	false
2020-04-02T00:15Z	1.135	false
2020-04-02T00:00Z	1.135	false
2020-04-01T23:45Z	1.135	false
2020-04-01T23:30Z	1.136	false
2020-04-01T23:15Z	1.136	false
2020-04-01T23:00Z	1.135	false
2020-04-01T22:45Z	1.136	false
2020-04-01T22:30Z	1.136	false
2020-04-01T22:15Z	1.136	false
2020-04-01T22:00Z	1.136	false
2020-04-01T21:45Z	1.135	false
2020-04-01T21:30Z	1.135	false
2020-04-01T21:15Z	1.136	false
2020-04-01T21:00Z	1.136	false
2020-04-01T20:45Z	1.136	false
2020-04-01T20:30Z	1.135	false
2020-04-01T20:15Z	1.135	false
2020-04-01T20:00Z	1.136	false
2020-04-01T19:45Z	1.136	false
2020-04-01T19:30Z	1.137	false
2020-04-01T19:15Z	1.137	false
2020-04-01T19:00Z	1.137	false
2020-04-01T18:45Z	1.136	false
2020-04-01T18:30Z	1.136	false
2020-04-01T18:15Z	1.135	false
2020-04-01T18:00Z	1.135	false
2020-04-01T17:45Z	1.136	false
2020-04-01T17:30Z	1.136	false
2020-04-01T17:15Z	1.136	false
2020-04-01T17:00Z	1.136	false
2020-04-01T16:45Z	1.136	false
2020-04-01T16:30Z	1.135	false
2020-04-01T16:15Z	1.135	false
2020-04-01T16:00Z	1.136	false
2020-04-01T15:45Z	1.136	false
2020-04-01T15:30Z	1.135	false
2020-04-01T15:15Z	1.135	false
2020-04-01T15:00Z	1.135	false
2020-04-01T14:45Z	1.135	false
2020-04-01T14:30Z	1.135	false
2020-04-01T14:15Z	1.135	false
2020-04-01T14:00Z	1.135	false
2020-04-01T13:45Z	1.135	false
2020-04-01T13:30Z	1.135	false
2020-04-01T13:15Z	1.135	false
2020-04-01T13:00Z	1.135	false
2020-04-01T12:45Z	1.135	false
2020-04-01T12:30Z	1.135	false
2020-04-01T12:15Z	1.135	false
2020-04-01T12:00Z	1.135	false
2020-04-01T11:45Z	1.135	false
2020-04-01T11:30Z	1.135	false
2020-04-01T11:15Z	1.135	false
2020-04-01T11:00Z	1.134	false
2020-04-01T10:45Z	1.135	false
2020-04-01T10:30Z	1.134	false
2020-04-01T10:15Z	1.134	false
2020-04-01T10:00Z	1.134	false
2020-04-01T09:45Z	1.134	false
2020-04-01T09:30Z	1.134	false
2020-04-01T09:15Z	1.135	false
2020-04-01T09:00Z	1.134	false
2020-04-01T08:45Z	1.134	false
2020-04-01T08:30Z	1.133	false
2020-04-01T08:15Z	1.133	false
2020-04-01T08:00Z	1.133	false
2020-04-01T07:45Z	1.133	false
2020-04-01T07:30Z	1.133	false
2020-04-01T07:15Z	1.133	false
2020-04-01T07:00Z	1.132	false
2020-04-01T06:45Z	1.132	false
2020-04-01T06:30Z	1.132	false
2020-04-01T06:15Z	1.132	false
2020-04-01T06:00Z	1.132	false
2020-04-01T05:45Z	1.132	false
2020-04-01T05:30Z	1.131	false
2020-04-01T05:15Z	1.132	false
2020-04-01T05:00Z	1.131	false
2020-04-01T04:45Z	1.132	false
2020-04-01T04:30Z	1.132	false
2020-04-01T04:15Z	1.132	false
2020-04-01T04:00Z	1.131	false
2020-04-01T03:45Z	1.131	false
2020-04-01T03:30Z	1.131	false
2020-04-01T03:15Z	1.131	false
2020-04-01T03:00Z	1.131	false
2020-04-01T02:45Z	1.131	false
2020-04-01T02:30Z	1.131	false
2020-04-01T02:15Z	1.131	false
2020-04-01T02:00Z	1.131	false
2020-04-01T01:45Z	1.13	false
2020-04-01T01:30Z	1.13	false
2020-04-01T01:15Z	1.13	false
2020-04-01T01:00Z	1.13	false
2020-04-01T00:45Z	1.131	false
2020-04-01T00:30Z	1.132	false
2020-04-01T00:15Z	1.133	false
2020-04-01T00:00Z	1.133	false
2020-03-31T23:45Z	1.134	false
2020-03-31T23:30Z	1.134	false
2020-03-31T23:15Z	1.134	false
2020-03-31T23:00Z	1.134	false
2020-03-31T22:45Z	1.134	false
2020-03-31T22:30Z	1.134	false
2020-03-31T22:15Z	1.134	false
2020-03-31T22:00Z	1.134	false
2020-03-31T21:45Z	1.134	false
2020-03-31T21:30Z	1.134	false
2020-03-31T21:15Z	1.134	false
2020-03-31T21:00Z	1.134	false
2020-03-31T20:45Z	1.134	false
2020-03-31T20:30Z	1.133	false
2020-03-31T20:15Z	1.133	false
2020-03-31T20:00Z	1.134	false
2020-03-31T19:45Z	1.134	false
2020-03-31T19:30Z	1.134	false
2020-03-31T19:15Z	1.134	false
2020-03-31T19:00Z	1.134	false
2020-03-31T18:45Z	1.134	false
2020-03-31T18:30Z	1.133	false
2020-03-31T18:15Z	1.132	false
2020-03-31T18:00Z	1.131	false
2020-03-31T17:45Z	1.131	false
2020-03-31T17:30Z	1.131	false
2020-03-31T17:15Z	1.131	false
2020-03-31T17:00Z	1.131	false
2020-03-31T16:45Z	1.13	false
2020-03-31T16:30Z	1.13	false
2020-03-31T16:15Z	1.13	false
2020-03-31T16:00Z	1.131	false
2020-03-31T15:45Z	1.129	false
2020-03-31T15:30Z	1.13	false
2020-03-31T15:15Z	1.13	false
2020-03-31T15:00Z	1.13	false
2020-03-31T14:45Z	1.13	false
2020-03-31T14:30Z	1.13	false
2020-03-31T14:15Z	1.13	false
2020-03-31T14:00Z	1.13	false
2020-03-31T13:45Z	1.13	false
2020-03-31T13:30Z	1.13	false
2020-03-31T13:15Z	1.13	false
2020-03-31T13:00Z	1.129	false
2020-03-31T12:45Z	1.131	false
2020-03-31T12:30Z	1.132	false
2020-03-31T12:15Z	1.13	false
2020-03-31T12:00Z	1.13	false
2020-03-31T11:45Z	1.131	false
2020-03-31T11:30Z	1.13	false
2020-03-31T11:15Z	1.13	false
2020-03-31T11:00Z	1.13	false
2020-03-31T10:45Z	1.13	false
2020-03-31T10:30Z	1.131	false
2020-03-31T10:15Z	1.131	false
2020-03-31T10:00Z	1.131	false
2020-03-31T09:45Z	1.131	false
2020-03-31T09:30Z	1.132	false
2020-03-31T09:15Z	1.131	false
2020-03-31T09:00Z	1.132	false
2020-03-31T08:45Z	1.131	false
2020-03-31T08:30Z	1.132	false
2020-03-31T08:15Z	1.134	false
2020-03-31T08:00Z	1.136	false
2020-03-31T07:45Z	1.137	false
2020-03-31T07:30Z	1.137	false
2020-03-31T07:15Z	1.137	false
2020-03-31T07:00Z	1.137	false
2020-03-31T06:45Z	1.137	false
2020-03-31T06:30Z	1.138	false
2020-03-31T06:15Z	1.137	false
2020-03-31T06:00Z	1.137	false
2020-03-31T05:45Z	1.137	false
2020-03-31T05:30Z	1.137	false
2020-03-31T05:15Z	1.137	false
2020-03-31T05:00Z	1.137	false
2020-03-31T04:45Z	1.138	false
2020-03-31T04:30Z	1.138	false
2020-03-31T04:15Z	1.138	false
2020-03-31T04:00Z	1.138	false
2020-03-31T03:45Z	1.138	false
2020-03-31T03:30Z	1.138	false
2020-03-31T03:15Z	1.138	false
2020-03-31T03:00Z	1.138	false
2020-03-31T02:45Z	1.138	false
2020-03-31T02:30Z	1.138	false
2020-03-31T02:15Z	1.138	false
2020-03-31T02:00Z	1.138	false
2020-03-31T01:45Z	1.138	false
2020-03-31T01:30Z	1.138	false
2020-03-31T01:15Z	1.138	false
2020-03-31T01:00Z	1.138	false
2020-03-31T00:45Z	1.138	false
2020-03-31T00:30Z	1.138	false
2020-03-31T00:15Z	1.138	false

Forecast data

April 5th 2020, 1:00:00 am	1.118
April 5th 2020, 1:15:00 am	1.118
April 5th 2020, 1:30:00 am	1.118
April 5th 2020, 1:45:00 am	1.118
April 5th 2020, 2:00:00 am	1.118
April 5th 2020, 2:15:00 am	1.118
April 5th 2020, 2:30:00 am	1.118
April 5th 2020, 2:45:00 am	1.118
April 5th 2020, 3:00:00 am	1.118
April 5th 2020, 3:15:00 am	1.118
April 5th 2020, 3:30:00 am	1.118
April 5th 2020, 3:45:00 am	1.118
April 5th 2020, 4:00:00 am	1.118
April 5th 2020, 4:15:00 am	1.118
April 5th 2020, 4:30:00 am	1.118
April 5th 2020, 4:45:00 am	1.118
April 5th 2020, 5:00:00 am	1.118
April 5th 2020, 5:15:00 am	1.118
April 5th 2020, 5:30:00 am	1.118
April 5th 2020, 5:45:00 am	1.118
April 5th 2020, 6:00:00 am	1.118
April 5th 2020, 6:15:00 am	1.118
April 5th 2020, 6:30:00 am	1.118
April 5th 2020, 6:45:00 am	1.118
April 5th 2020, 7:00:00 am	1.118
April 5th 2020, 7:15:00 am	1.118
April 5th 2020, 7:30:00 am	1.118
April 5th 2020, 7:45:00 am	1.118
April 5th 2020, 8:00:00 am	1.118
April 5th 2020, 8:15:00 am	1.118
April 5th 2020, 8:30:00 am	1.118
April 5th 2020, 8:45:00 am	1.118
April 5th 2020, 9:00:00 am	1.118
April 5th 2020, 9:15:00 am	1.118
April 5th 2020, 9:30:00 am	1.118
April 5th 2020, 9:45:00 am	1.118
April 5th 2020, 10:00:00 am	1.118
April 5th 2020, 10:15:00 am	1.118
April 5th 2020, 10:30:00 am	1.118
April 5th 2020, 10:45:00 am	1.118
April 5th 2020, 11:00:00 am	1.118
April 5th 2020, 11:15:00 am	1.118
April 5th 2020, 11:30:00 am	1.118
April 5th 2020, 11:45:00 am	1.118
April 5th 2020, 12:00:00 pm	1.118
April 5th 2020, 12:15:00 pm	1.118
April 5th 2020, 12:30:00 pm	1.118
April 5th 2020, 12:45:00 pm	1.118
April 5th 2020, 1:00:00 pm	1.118
April 5th 2020, 1:15:00 pm	1.118
April 5th 2020, 1:30:00 pm	1.118
April 5th 2020, 1:45:00 pm	1.118
April 5th 2020, 2:00:00 pm	1.118
April 5th 2020, 2:15:00 pm	1.118
April 5th 2020, 2:30:00 pm	1.118
April 5th 2020, 2:45:00 pm	1.118
April 5th 2020, 3:00:00 pm	1.118
April 5th 2020, 3:15:00 pm	1.118
April 5th 2020, 3:30:00 pm	1.119
April 5th 2020, 3:45:00 pm	1.119
April 5th 2020, 4:00:00 pm	1.119
April 5th 2020, 4:15:00 pm	1.119
April 5th 2020, 4:30:00 pm	1.119
April 5th 2020, 4:45:00 pm	1.119
April 5th 2020, 5:00:00 pm	1.119
April 5th 2020, 5:15:00 pm	1.119
April 5th 2020, 5:30:00 pm	1.119
April 5th 2020, 5:45:00 pm	1.119
April 5th 2020, 6:00:00 pm	1.119
April 5th 2020, 6:15:00 pm	1.119
April 5th 2020, 6:30:00 pm	1.119
April 5th 2020, 6:45:00 pm	1.119
April 5th 2020, 7:00:00 pm	1.119
April 5th 2020, 7:15:00 pm	1.119
April 5th 2020, 7:30:00 pm	1.119
April 5th 2020, 7:45:00 pm	1.119
April 5th 2020, 8:00:00 pm	1.119
April 5th 2020, 8:15:00 pm	1.119
April 5th 2020, 8:30:00 pm	1.119
April 5th 2020, 8:45:00 pm	1.119
April 5th 2020, 9:00:00 pm	1.119
April 5th 2020, 9:15:00 pm	1.119
April 5th 2020, 9:30:00 pm	1.119
April 5th 2020, 9:45:00 pm	1.119
April 5th 2020, 10:00:00 pm	1.119
April 5th 2020, 10:15:00 pm	1.119
April 5th 2020, 10:30:00 pm	1.119
April 5th 2020, 10:45:00 pm	1.119
April 5th 2020, 11:00:00 pm	1.119
April 5th 2020, 11:15:00 pm	1.119
April 5th 2020, 11:30:00 pm	1.119
April 5th 2020, 11:45:00 pm	1.119
April 6th 2020, 12:00:00 am	1.119
April 6th 2020, 12:15:00 am	1.119
April 6th 2020, 12:30:00 am	1.119
April 6th 2020, 12:45:00 am	1.119
April 6th 2020, 1:00:00 am	1.119
April 6th 2020, 1:15:00 am	1.119
April 6th 2020, 1:30:00 am	1.119
April 6th 2020, 1:45:00 am	1.119
April 6th 2020, 2:00:00 am	1.119
April 6th 2020, 2:15:00 am	1.119
April 6th 2020, 2:30:00 am	1.119
April 6th 2020, 2:45:00 am	1.119
April 6th 2020, 3:00:00 am	1.119
April 6th 2020, 3:15:00 am	1.119
April 6th 2020, 3:30:00 am	1.119
April 6th 2020, 3:45:00 am	1.119
April 6th 2020, 4:00:00 am	1.119
April 6th 2020, 4:15:00 am	1.119
April 6th 2020, 4:30:00 am	1.119
April 6th 2020, 4:45:00 am	1.119
April 6th 2020, 5:00:00 am	1.119
April 6th 2020, 5:15:00 am	1.119
April 6th 2020, 5:30:00 am	1.119
April 6th 2020, 5:45:00 am	1.119
April 6th 2020, 6:00:00 am	1.119
April 6th 2020, 6:15:00 am	1.119
April 6th 2020, 6:30:00 am	1.119
April 6th 2020, 6:45:00 am	1.119
April 6th 2020, 7:00:00 am	1.119
April 6th 2020, 7:15:00 am	1.119
April 6th 2020, 7:30:00 am	1.119
April 6th 2020, 7:45:00 am	1.119
April 6th 2020, 8:00:00 am	1.119
April 6th 2020, 8:15:00 am	1.119
April 6th 2020, 8:30:00 am	1.119
April 6th 2020, 8:45:00 am	1.119
April 6th 2020, 9:00:00 am	1.119
April 6th 2020, 9:15:00 am	1.119
April 6th 2020, 9:30:00 am	1.119
April 6th 2020, 9:45:00 am	1.119
April 6th 2020, 10:00:00 am	1.119
April 6th 2020, 10:15:00 am	1.119
April 6th 2020, 10:30:00 am	1.119
April 6th 2020, 10:45:00 am	1.119
April 6th 2020, 11:00:00 am	1.119
April 6th 2020, 11:15:00 am	1.119
April 6th 2020, 11:30:00 am	1.119
April 6th 2020, 11:45:00 am	1.119
April 6th 2020, 12:00:00 pm	1.119
April 6th 2020, 12:15:00 pm	1.119
April 6th 2020, 12:30:00 pm	1.119
April 6th 2020, 12:45:00 pm	1.119
April 6th 2020, 1:00:00 pm	1.119

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 1.12m at 3:30pm Sunday 5 April 2020.

Highest level recorded at this location

2.72m on 30 October 2000

View nearby measuring stations