River level River Colne at London Colney

Latest recorded level 1.19m at 6:00pm Wednesday 29 January 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
2020-01-29T18:00Z	1.19	false
2020-01-29T17:45Z	1.191	false
2020-01-29T17:30Z	1.192	false
2020-01-29T17:15Z	1.192	false
2020-01-29T17:00Z	1.193	false
2020-01-29T16:45Z	1.194	false
2020-01-29T16:30Z	1.195	false
2020-01-29T16:15Z	1.196	false
2020-01-29T16:00Z	1.197	false
2020-01-29T15:45Z	1.197	false
2020-01-29T15:30Z	1.199	false
2020-01-29T15:15Z	1.199	false
2020-01-29T15:00Z	1.201	false
2020-01-29T14:45Z	1.202	false
2020-01-29T14:30Z	1.203	false
2020-01-29T14:15Z	1.204	false
2020-01-29T14:00Z	1.205	false
2020-01-29T13:45Z	1.206	false
2020-01-29T13:30Z	1.207	false
2020-01-29T13:15Z	1.208	false
2020-01-29T13:00Z	1.209	false
2020-01-29T12:45Z	1.211	false
2020-01-29T12:30Z	1.212	false
2020-01-29T12:15Z	1.213	false
2020-01-29T12:00Z	1.214	false
2020-01-29T11:45Z	1.215	false
2020-01-29T11:30Z	1.216	false
2020-01-29T11:15Z	1.218	false
2020-01-29T11:00Z	1.219	false
2020-01-29T10:45Z	1.22	false
2020-01-29T10:30Z	1.221	false
2020-01-29T10:15Z	1.223	false
2020-01-29T10:00Z	1.224	false
2020-01-29T09:45Z	1.225	false
2020-01-29T09:30Z	1.226	false
2020-01-29T09:15Z	1.228	false
2020-01-29T09:00Z	1.23	false
2020-01-29T08:45Z	1.233	false
2020-01-29T08:30Z	1.241	false
2020-01-29T08:15Z	1.245	false
2020-01-29T08:00Z	1.246	false
2020-01-29T07:45Z	1.249	false
2020-01-29T07:30Z	1.249	false
2020-01-29T07:15Z	1.251	false
2020-01-29T07:00Z	1.252	false
2020-01-29T06:45Z	1.254	false
2020-01-29T06:30Z	1.255	false
2020-01-29T06:15Z	1.257	false
2020-01-29T06:00Z	1.258	false
2020-01-29T05:45Z	1.26	false
2020-01-29T05:30Z	1.261	false
2020-01-29T05:15Z	1.263	false
2020-01-29T05:00Z	1.265	false
2020-01-29T04:45Z	1.266	false
2020-01-29T04:30Z	1.267	false
2020-01-29T04:15Z	1.269	false
2020-01-29T04:00Z	1.271	false
2020-01-29T03:45Z	1.272	false
2020-01-29T03:30Z	1.274	false
2020-01-29T03:15Z	1.276	false
2020-01-29T03:00Z	1.277	false
2020-01-29T02:45Z	1.279	false
2020-01-29T02:30Z	1.281	false
2020-01-29T02:15Z	1.283	false
2020-01-29T02:00Z	1.284	false
2020-01-29T01:45Z	1.286	false
2020-01-29T01:30Z	1.287	false
2020-01-29T01:15Z	1.29	false
2020-01-29T01:00Z	1.291	false
2020-01-29T00:45Z	1.293	false
2020-01-29T00:30Z	1.295	false
2020-01-29T00:15Z	1.296	false
2020-01-29T00:00Z	1.298	false
2020-01-28T23:45Z	1.3	false
2020-01-28T23:30Z	1.302	false
2020-01-28T23:15Z	1.303	false
2020-01-28T23:00Z	1.304	false
2020-01-28T22:45Z	1.306	false
2020-01-28T22:30Z	1.307	false
2020-01-28T22:15Z	1.309	false
2020-01-28T22:00Z	1.311	false
2020-01-28T21:45Z	1.312	false
2020-01-28T21:30Z	1.313	false
2020-01-28T21:15Z	1.315	false
2020-01-28T21:00Z	1.316	false
2020-01-28T20:45Z	1.317	false
2020-01-28T20:30Z	1.318	false
2020-01-28T20:15Z	1.32	false
2020-01-28T20:00Z	1.32	false
2020-01-28T19:45Z	1.321	false
2020-01-28T19:30Z	1.323	false
2020-01-28T19:15Z	1.324	false
2020-01-28T19:00Z	1.325	false
2020-01-28T18:45Z	1.326	false
2020-01-28T18:30Z	1.328	false
2020-01-28T18:15Z	1.328	false
2020-01-28T18:00Z	1.329	false
2020-01-28T17:45Z	1.33	false
2020-01-28T17:30Z	1.331	false
2020-01-28T17:15Z	1.332	false
2020-01-28T17:00Z	1.333	false
2020-01-28T16:45Z	1.334	false
2020-01-28T16:30Z	1.335	false
2020-01-28T16:15Z	1.335	false
2020-01-28T16:00Z	1.337	false
2020-01-28T15:45Z	1.337	false
2020-01-28T15:30Z	1.338	false
2020-01-28T15:15Z	1.338	false
2020-01-28T15:00Z	1.337	false
2020-01-28T14:45Z	1.339	false
2020-01-28T14:30Z	1.339	false
2020-01-28T14:15Z	1.339	false
2020-01-28T14:00Z	1.339	false
2020-01-28T13:45Z	1.34	false
2020-01-28T13:30Z	1.34	false
2020-01-28T13:15Z	1.341	false
2020-01-28T13:00Z	1.341	false
2020-01-28T12:45Z	1.341	false
2020-01-28T12:30Z	1.342	false
2020-01-28T12:15Z	1.342	false
2020-01-28T12:00Z	1.342	false
2020-01-28T11:45Z	1.342	false
2020-01-28T11:30Z	1.342	false
2020-01-28T11:15Z	1.344	false
2020-01-28T11:00Z	1.344	false
2020-01-28T10:45Z	1.344	false
2020-01-28T10:30Z	1.345	false
2020-01-28T10:15Z	1.346	false
2020-01-28T10:00Z	1.347	false
2020-01-28T09:45Z	1.348	false
2020-01-28T09:30Z	1.348	false
2020-01-28T09:15Z	1.349	false
2020-01-28T09:00Z	1.35	false
2020-01-28T08:45Z	1.351	false
2020-01-28T08:30Z	1.351	false
2020-01-28T08:15Z	1.353	false
2020-01-28T08:00Z	1.354	false
2020-01-28T07:45Z	1.354	false
2020-01-28T07:30Z	1.355	false
2020-01-28T07:15Z	1.355	false
2020-01-28T07:00Z	1.355	false
2020-01-28T06:45Z	1.356	false
2020-01-28T06:30Z	1.356	false
2020-01-28T06:15Z	1.355	false
2020-01-28T06:00Z	1.354	false
2020-01-28T05:45Z	1.351	false
2020-01-28T05:30Z	1.347	false
2020-01-28T05:15Z	1.34	false
2020-01-28T05:00Z	1.327	false
2020-01-28T04:45Z	1.307	false
2020-01-28T04:30Z	1.277	false
2020-01-28T04:15Z	1.2	false
2020-01-28T04:00Z	1.17	false
2020-01-28T03:45Z	1.151	false
2020-01-28T03:30Z	1.146	false
2020-01-28T03:15Z	1.146	false
2020-01-28T03:00Z	1.145	false
2020-01-28T02:45Z	1.145	false
2020-01-28T02:30Z	1.144	false
2020-01-28T02:15Z	1.144	false
2020-01-28T02:00Z	1.143	false
2020-01-28T01:45Z	1.142	false
2020-01-28T01:30Z	1.14	false
2020-01-28T01:15Z	1.139	false
2020-01-28T01:00Z	1.138	false
2020-01-28T00:45Z	1.136	false
2020-01-28T00:30Z	1.136	false
2020-01-28T00:15Z	1.134	false
2020-01-28T00:00Z	1.132	false
2020-01-27T23:45Z	1.132	false
2020-01-27T23:30Z	1.13	false
2020-01-27T23:15Z	1.127	false
2020-01-27T23:00Z	1.126	false
2020-01-27T22:45Z	1.125	false
2020-01-27T22:30Z	1.123	false
2020-01-27T22:15Z	1.121	false
2020-01-27T22:00Z	1.119	false
2020-01-27T21:45Z	1.119	false
2020-01-27T21:30Z	1.118	false
2020-01-27T21:15Z	1.118	false
2020-01-27T21:00Z	1.119	false
2020-01-27T20:45Z	1.119	false
2020-01-27T20:30Z	1.118	false
2020-01-27T20:15Z	1.119	false
2020-01-27T20:00Z	1.119	false
2020-01-27T19:45Z	1.12	false
2020-01-27T19:30Z	1.121	false
2020-01-27T19:15Z	1.123	false
2020-01-27T19:00Z	1.125	false
2020-01-27T18:45Z	1.125	false
2020-01-27T18:30Z	1.126	false
2020-01-27T18:15Z	1.127	false
2020-01-27T18:00Z	1.128	false
2020-01-27T17:45Z	1.129	false
2020-01-27T17:30Z	1.13	false
2020-01-27T17:15Z	1.129	false
2020-01-27T17:00Z	1.129	false
2020-01-27T16:45Z	1.127	false
2020-01-27T16:30Z	1.123	false
2020-01-27T16:15Z	1.121	false
2020-01-27T16:00Z	1.118	false
2020-01-27T15:45Z	1.115	false
2020-01-27T15:30Z	1.114	false
2020-01-27T15:15Z	1.113	false
2020-01-27T15:00Z	1.113	false
2020-01-27T14:45Z	1.111	false
2020-01-27T14:30Z	1.111	false
2020-01-27T14:15Z	1.111	false
2020-01-27T14:00Z	1.111	false
2020-01-27T13:45Z	1.112	false
2020-01-27T13:30Z	1.112	false
2020-01-27T13:15Z	1.112	false
2020-01-27T13:00Z	1.112	false
2020-01-27T12:45Z	1.112	false
2020-01-27T12:30Z	1.112	false
2020-01-27T12:15Z	1.113	false
2020-01-27T12:00Z	1.113	false
2020-01-27T11:45Z	1.114	false
2020-01-27T11:30Z	1.113	false
2020-01-27T11:15Z	1.113	false
2020-01-27T11:00Z	1.114	false
2020-01-27T10:45Z	1.114	false
2020-01-27T10:30Z	1.114	false
2020-01-27T10:15Z	1.114	false
2020-01-27T10:00Z	1.115	false
2020-01-27T09:45Z	1.115	false
2020-01-27T09:30Z	1.114	false
2020-01-27T09:15Z	1.114	false
2020-01-27T09:00Z	1.113	false
2020-01-27T08:45Z	1.115	false
2020-01-27T08:30Z	1.114	false
2020-01-27T08:15Z	1.114	false
2020-01-27T08:00Z	1.114	false
2020-01-27T07:45Z	1.113	false
2020-01-27T07:30Z	1.115	false
2020-01-27T07:15Z	1.114	false
2020-01-27T07:00Z	1.113	false
2020-01-27T06:45Z	1.114	false
2020-01-27T06:30Z	1.113	false
2020-01-27T06:15Z	1.113	false
2020-01-27T06:00Z	1.113	false
2020-01-27T05:45Z	1.113	false
2020-01-27T05:30Z	1.113	false
2020-01-27T05:15Z	1.113	false
2020-01-27T05:00Z	1.112	false
2020-01-27T04:45Z	1.112	false
2020-01-27T04:30Z	1.112	false
2020-01-27T04:15Z	1.112	false
2020-01-27T04:00Z	1.112	false
2020-01-27T03:45Z	1.113	false
2020-01-27T03:30Z	1.111	false
2020-01-27T03:15Z	1.112	false
2020-01-27T03:00Z	1.111	false
2020-01-27T02:45Z	1.11	false
2020-01-27T02:30Z	1.11	false
2020-01-27T02:15Z	1.111	false
2020-01-27T02:00Z	1.11	false
2020-01-27T01:45Z	1.11	false
2020-01-27T01:30Z	1.109	false
2020-01-27T01:15Z	1.11	false
2020-01-27T01:00Z	1.11	false
2020-01-27T00:45Z	1.11	false
2020-01-27T00:30Z	1.11	false
2020-01-27T00:15Z	1.111	false
2020-01-27T00:00Z	1.111	false
2020-01-26T23:45Z	1.111	false
2020-01-26T23:30Z	1.112	false
2020-01-26T23:15Z	1.112	false
2020-01-26T23:00Z	1.112	false
2020-01-26T22:45Z	1.112	false
2020-01-26T22:30Z	1.112	false
2020-01-26T22:15Z	1.112	false
2020-01-26T22:00Z	1.113	false
2020-01-26T21:45Z	1.113	false
2020-01-26T21:30Z	1.113	false
2020-01-26T21:15Z	1.113	false
2020-01-26T21:00Z	1.113	false
2020-01-26T20:45Z	1.113	false
2020-01-26T20:30Z	1.113	false
2020-01-26T20:15Z	1.111	false
2020-01-26T20:00Z	1.112	false
2020-01-26T19:45Z	1.112	false
2020-01-26T19:30Z	1.112	false
2020-01-26T19:15Z	1.112	false
2020-01-26T19:00Z	1.111	false
2020-01-26T18:45Z	1.111	false
2020-01-26T18:30Z	1.11	false
2020-01-26T18:15Z	1.11	false
2020-01-26T18:00Z	1.11	false
2020-01-26T17:45Z	1.109	false
2020-01-26T17:30Z	1.109	false
2020-01-26T17:15Z	1.11	false
2020-01-26T17:00Z	1.11	false
2020-01-26T16:45Z	1.109	false
2020-01-26T16:30Z	1.109	false
2020-01-26T16:15Z	1.108	false
2020-01-26T16:00Z	1.109	false
2020-01-26T15:45Z	1.108	false
2020-01-26T15:30Z	1.108	false
2020-01-26T15:15Z	1.108	false
2020-01-26T15:00Z	1.109	false
2020-01-26T14:45Z	1.109	false
2020-01-26T14:30Z	1.108	false
2020-01-26T14:15Z	1.108	false
2020-01-26T14:00Z	1.109	false
2020-01-26T13:45Z	1.109	false
2020-01-26T13:30Z	1.109	false
2020-01-26T13:15Z	1.109	false
2020-01-26T13:00Z	1.109	false
2020-01-26T12:45Z	1.109	false
2020-01-26T12:30Z	1.108	false
2020-01-26T12:15Z	1.11	false
2020-01-26T12:00Z	1.109	false
2020-01-26T11:45Z	1.11	false
2020-01-26T11:30Z	1.109	false
2020-01-26T11:15Z	1.109	false
2020-01-26T11:00Z	1.109	false
2020-01-26T10:45Z	1.109	false
2020-01-26T10:30Z	1.109	false
2020-01-26T10:15Z	1.109	false
2020-01-26T10:00Z	1.11	false
2020-01-26T09:45Z	1.11	false
2020-01-26T09:30Z	1.11	false
2020-01-26T09:15Z	1.11	false
2020-01-26T09:00Z	1.109	false
2020-01-26T08:45Z	1.109	false
2020-01-26T08:30Z	1.11	false
2020-01-26T08:15Z	1.111	false
2020-01-26T08:00Z	1.112	false
2020-01-26T07:45Z	1.11	false
2020-01-26T07:30Z	1.112	false
2020-01-26T07:15Z	1.11	false
2020-01-26T07:00Z	1.11	false
2020-01-26T06:45Z	1.112	false
2020-01-26T06:30Z	1.112	false
2020-01-26T06:15Z	1.11	false
2020-01-26T06:00Z	1.11	false
2020-01-26T05:45Z	1.112	false
2020-01-26T05:30Z	1.112	false
2020-01-26T05:15Z	1.112	false
2020-01-26T05:00Z	1.11	false
2020-01-26T04:45Z	1.112	false
2020-01-26T04:30Z	1.11	false
2020-01-26T04:15Z	1.11	false
2020-01-26T04:00Z	1.11	false
2020-01-26T03:45Z	1.11	false
2020-01-26T03:30Z	1.11	false
2020-01-26T03:15Z	1.11	false
2020-01-26T03:00Z	1.11	false
2020-01-26T02:45Z	1.11	false
2020-01-26T02:30Z	1.11	false
2020-01-26T02:15Z	1.11	false
2020-01-26T02:00Z	1.111	false
2020-01-26T01:45Z	1.11	false
2020-01-26T01:30Z	1.11	false
2020-01-26T01:15Z	1.11	false
2020-01-26T01:00Z	1.11	false
2020-01-26T00:45Z	1.11	false
2020-01-26T00:30Z	1.11	false
2020-01-26T00:15Z	1.11	false
2020-01-26T00:00Z	1.11	false
2020-01-25T23:45Z	1.11	false
2020-01-25T23:30Z	1.11	false
2020-01-25T23:15Z	1.11	false
2020-01-25T23:00Z	1.11	false
2020-01-25T22:45Z	1.11	false
2020-01-25T22:30Z	1.11	false
2020-01-25T22:15Z	1.111	false
2020-01-25T22:00Z	1.111	false
2020-01-25T21:45Z	1.11	false
2020-01-25T21:30Z	1.11	false
2020-01-25T21:15Z	1.11	false
2020-01-25T21:00Z	1.11	false
2020-01-25T20:45Z	1.11	false
2020-01-25T20:30Z	1.111	false
2020-01-25T20:15Z	1.111	false
2020-01-25T20:00Z	1.111	false
2020-01-25T19:45Z	1.111	false
2020-01-25T19:30Z	1.11	false
2020-01-25T19:15Z	1.111	false
2020-01-25T19:00Z	1.11	false
2020-01-25T18:45Z	1.111	false
2020-01-25T18:30Z	1.112	false
2020-01-25T18:15Z	1.111	false
2020-01-25T18:00Z	1.111	false
2020-01-25T17:45Z	1.112	false
2020-01-25T17:30Z	1.112	false
2020-01-25T17:15Z	1.111	false
2020-01-25T17:00Z	1.111	false
2020-01-25T16:45Z	1.111	false
2020-01-25T16:30Z	1.112	false
2020-01-25T16:15Z	1.111	false
2020-01-25T16:00Z	1.111	false
2020-01-25T15:45Z	1.112	false
2020-01-25T15:30Z	1.111	false
2020-01-25T15:15Z	1.111	false
2020-01-25T15:00Z	1.108	false
2020-01-25T14:45Z	1.108	false
2020-01-25T14:30Z	1.107	false
2020-01-25T14:15Z	1.107	false
2020-01-25T14:00Z	1.107	false
2020-01-25T13:45Z	1.109	false
2020-01-25T13:30Z	1.108	false
2020-01-25T13:15Z	1.109	false
2020-01-25T13:00Z	1.109	false
2020-01-25T12:45Z	1.109	false
2020-01-25T12:30Z	1.109	false
2020-01-25T12:15Z	1.109	false
2020-01-25T12:00Z	1.109	false
2020-01-25T11:45Z	1.109	false
2020-01-25T11:30Z	1.108	false
2020-01-25T11:15Z	1.109	false
2020-01-25T11:00Z	1.111	false
2020-01-25T10:45Z	1.112	false
2020-01-25T10:30Z	1.113	false
2020-01-25T10:15Z	1.113	false
2020-01-25T10:00Z	1.113	false
2020-01-25T09:45Z	1.114	false
2020-01-25T09:30Z	1.114	false
2020-01-25T09:15Z	1.114	false
2020-01-25T09:00Z	1.114	false
2020-01-25T08:45Z	1.115	false
2020-01-25T08:30Z	1.115	false
2020-01-25T08:15Z	1.115	false
2020-01-25T08:00Z	1.115	false
2020-01-25T07:45Z	1.114	false
2020-01-25T07:30Z	1.113	false
2020-01-25T07:15Z	1.112	false
2020-01-25T07:00Z	1.112	false
2020-01-25T06:45Z	1.113	false
2020-01-25T06:30Z	1.113	false
2020-01-25T06:15Z	1.113	false
2020-01-25T06:00Z	1.112	false
2020-01-25T05:45Z	1.112	false
2020-01-25T05:30Z	1.112	false
2020-01-25T05:15Z	1.112	false
2020-01-25T05:00Z	1.112	false
2020-01-25T04:45Z	1.112	false
2020-01-25T04:30Z	1.111	false
2020-01-25T04:15Z	1.112	false
2020-01-25T04:00Z	1.112	false
2020-01-25T03:45Z	1.112	false
2020-01-25T03:30Z	1.111	false
2020-01-25T03:15Z	1.111	false
2020-01-25T03:00Z	1.112	false
2020-01-25T02:45Z	1.112	false
2020-01-25T02:30Z	1.112	false
2020-01-25T02:15Z	1.112	false
2020-01-25T02:00Z	1.112	false
2020-01-25T01:45Z	1.112	false
2020-01-25T01:30Z	1.112	false
2020-01-25T01:15Z	1.112	false
2020-01-25T01:00Z	1.111	false
2020-01-25T00:45Z	1.111	false
2020-01-25T00:30Z	1.113	false
2020-01-25T00:15Z	1.113	false
2020-01-25T00:00Z	1.113	false
2020-01-24T23:45Z	1.113	false
2020-01-24T23:30Z	1.113	false
2020-01-24T23:15Z	1.114	false
2020-01-24T23:00Z	1.113	false
2020-01-24T22:45Z	1.113	false
2020-01-24T22:30Z	1.113	false
2020-01-24T22:15Z	1.113	false
2020-01-24T22:00Z	1.112	false
2020-01-24T21:45Z	1.112	false
2020-01-24T21:30Z	1.114	false
2020-01-24T21:15Z	1.114	false
2020-01-24T21:00Z	1.115	false
2020-01-24T20:45Z	1.114	false
2020-01-24T20:30Z	1.115	false
2020-01-24T20:15Z	1.115	false
2020-01-24T20:00Z	1.115	false
2020-01-24T19:45Z	1.116	false
2020-01-24T19:30Z	1.116	false
2020-01-24T19:15Z	1.116	false
2020-01-24T19:00Z	1.117	false
2020-01-24T18:45Z	1.116	false
2020-01-24T18:30Z	1.116	false
2020-01-24T18:15Z	1.116	false

Forecast data

January 29th 2020, 6:00:00 pm	1.190
January 29th 2020, 6:15:00 pm	1.189
January 29th 2020, 6:30:00 pm	1.189
January 29th 2020, 6:45:00 pm	1.188
January 29th 2020, 7:00:00 pm	1.188
January 29th 2020, 7:15:00 pm	1.188
January 29th 2020, 7:30:00 pm	1.187
January 29th 2020, 7:45:00 pm	1.187
January 29th 2020, 8:00:00 pm	1.187
January 29th 2020, 8:15:00 pm	1.187
January 29th 2020, 8:30:00 pm	1.187
January 29th 2020, 8:45:00 pm	1.187
January 29th 2020, 9:00:00 pm	1.187
January 29th 2020, 9:15:00 pm	1.187
January 29th 2020, 9:30:00 pm	1.187
January 29th 2020, 9:45:00 pm	1.187
January 29th 2020, 10:00:00 pm	1.187
January 29th 2020, 10:15:00 pm	1.187
January 29th 2020, 10:30:00 pm	1.187
January 29th 2020, 10:45:00 pm	1.187
January 29th 2020, 11:00:00 pm	1.187
January 29th 2020, 11:15:00 pm	1.187
January 29th 2020, 11:30:00 pm	1.187
January 29th 2020, 11:45:00 pm	1.187
January 30th 2020, 12:00:00 am	1.187
January 30th 2020, 12:15:00 am	1.188
January 30th 2020, 12:30:00 am	1.188
January 30th 2020, 12:45:00 am	1.188
January 30th 2020, 1:00:00 am	1.188
January 30th 2020, 1:15:00 am	1.188
January 30th 2020, 1:30:00 am	1.188
January 30th 2020, 1:45:00 am	1.188
January 30th 2020, 2:00:00 am	1.188
January 30th 2020, 2:15:00 am	1.188
January 30th 2020, 2:30:00 am	1.188
January 30th 2020, 2:45:00 am	1.188
January 30th 2020, 3:00:00 am	1.188
January 30th 2020, 3:15:00 am	1.188
January 30th 2020, 3:30:00 am	1.188
January 30th 2020, 3:45:00 am	1.188
January 30th 2020, 4:00:00 am	1.188
January 30th 2020, 4:15:00 am	1.188
January 30th 2020, 4:30:00 am	1.188
January 30th 2020, 4:45:00 am	1.188
January 30th 2020, 5:00:00 am	1.189
January 30th 2020, 5:15:00 am	1.189
January 30th 2020, 5:30:00 am	1.189
January 30th 2020, 5:45:00 am	1.189
January 30th 2020, 6:00:00 am	1.189
January 30th 2020, 6:15:00 am	1.189
January 30th 2020, 6:30:00 am	1.189
January 30th 2020, 6:45:00 am	1.189
January 30th 2020, 7:00:00 am	1.189
January 30th 2020, 7:15:00 am	1.189
January 30th 2020, 7:30:00 am	1.189
January 30th 2020, 7:45:00 am	1.189
January 30th 2020, 8:00:00 am	1.189
January 30th 2020, 8:15:00 am	1.189
January 30th 2020, 8:30:00 am	1.189
January 30th 2020, 8:45:00 am	1.189
January 30th 2020, 9:00:00 am	1.189
January 30th 2020, 9:15:00 am	1.189
January 30th 2020, 9:30:00 am	1.189
January 30th 2020, 9:45:00 am	1.189
January 30th 2020, 10:00:00 am	1.189
January 30th 2020, 10:15:00 am	1.189
January 30th 2020, 10:30:00 am	1.189
January 30th 2020, 10:45:00 am	1.189
January 30th 2020, 11:00:00 am	1.189
January 30th 2020, 11:15:00 am	1.190
January 30th 2020, 11:30:00 am	1.190
January 30th 2020, 11:45:00 am	1.190
January 30th 2020, 12:00:00 pm	1.190
January 30th 2020, 12:15:00 pm	1.190
January 30th 2020, 12:30:00 pm	1.190
January 30th 2020, 12:45:00 pm	1.190
January 30th 2020, 1:00:00 pm	1.190
January 30th 2020, 1:15:00 pm	1.190
January 30th 2020, 1:30:00 pm	1.190
January 30th 2020, 1:45:00 pm	1.190
January 30th 2020, 2:00:00 pm	1.190
January 30th 2020, 2:15:00 pm	1.190
January 30th 2020, 2:30:00 pm	1.190
January 30th 2020, 2:45:00 pm	1.190
January 30th 2020, 3:00:00 pm	1.190
January 30th 2020, 3:15:00 pm	1.190
January 30th 2020, 3:30:00 pm	1.190
January 30th 2020, 3:45:00 pm	1.190
January 30th 2020, 4:00:00 pm	1.190
January 30th 2020, 4:15:00 pm	1.190
January 30th 2020, 4:30:00 pm	1.190
January 30th 2020, 4:45:00 pm	1.190
January 30th 2020, 5:00:00 pm	1.190
January 30th 2020, 5:15:00 pm	1.190
January 30th 2020, 5:30:00 pm	1.190
January 30th 2020, 5:45:00 pm	1.190
January 30th 2020, 6:00:00 pm	1.190
January 30th 2020, 6:15:00 pm	1.190
January 30th 2020, 6:30:00 pm	1.190
January 30th 2020, 6:45:00 pm	1.190
January 30th 2020, 7:00:00 pm	1.190
January 30th 2020, 7:15:00 pm	1.190
January 30th 2020, 7:30:00 pm	1.190
January 30th 2020, 7:45:00 pm	1.190
January 30th 2020, 8:00:00 pm	1.190
January 30th 2020, 8:15:00 pm	1.190
January 30th 2020, 8:30:00 pm	1.190
January 30th 2020, 8:45:00 pm	1.191
January 30th 2020, 9:00:00 pm	1.191
January 30th 2020, 9:15:00 pm	1.191
January 30th 2020, 9:30:00 pm	1.191
January 30th 2020, 9:45:00 pm	1.191
January 30th 2020, 10:00:00 pm	1.191
January 30th 2020, 10:15:00 pm	1.191
January 30th 2020, 10:30:00 pm	1.191
January 30th 2020, 10:45:00 pm	1.191
January 30th 2020, 11:00:00 pm	1.191
January 30th 2020, 11:15:00 pm	1.191
January 30th 2020, 11:30:00 pm	1.191
January 30th 2020, 11:45:00 pm	1.191
January 31st 2020, 12:00:00 am	1.191
January 31st 2020, 12:15:00 am	1.191
January 31st 2020, 12:30:00 am	1.191
January 31st 2020, 12:45:00 am	1.191
January 31st 2020, 1:00:00 am	1.191
January 31st 2020, 1:15:00 am	1.191
January 31st 2020, 1:30:00 am	1.191
January 31st 2020, 1:45:00 am	1.191
January 31st 2020, 2:00:00 am	1.191
January 31st 2020, 2:15:00 am	1.191
January 31st 2020, 2:30:00 am	1.191
January 31st 2020, 2:45:00 am	1.191
January 31st 2020, 3:00:00 am	1.191
January 31st 2020, 3:15:00 am	1.191
January 31st 2020, 3:30:00 am	1.191
January 31st 2020, 3:45:00 am	1.191
January 31st 2020, 4:00:00 am	1.191
January 31st 2020, 4:15:00 am	1.191
January 31st 2020, 4:30:00 am	1.191
January 31st 2020, 4:45:00 am	1.191
January 31st 2020, 5:00:00 am	1.191
January 31st 2020, 5:15:00 am	1.191
January 31st 2020, 5:30:00 am	1.191
January 31st 2020, 5:45:00 am	1.191
January 31st 2020, 6:00:00 am	1.191

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 1.19m at 8:45pm Thursday 30 January 2020.

Highest level recorded at this location

2.72m on 30 October 2000

View nearby measuring stations