River level River Colne at London Colney

Latest recorded level 1.11m at 6:00pm Sunday 17 November 2019.

Levels: last 5 days and next 36 hours

Now
▼

Measured level
Forecast level
Property flooding possible
Low lying land may flood
Highest recorded level. Hide
Show highest recorded level

You're missing out. A graph should be visible here.
Upgrade your browser to see and use all the features of this service.

You're missing out. A graph should be visible here.

Javascript must be enabled.

Observed data

DateTime	Value	Error
2019-11-17T18:00Z	1.105	false
2019-11-17T17:45Z	1.103	false
2019-11-17T17:30Z	1.103	false
2019-11-17T17:15Z	1.105	false
2019-11-17T17:00Z	1.103	false
2019-11-17T16:45Z	1.104	false
2019-11-17T16:30Z	1.104	false
2019-11-17T16:15Z	1.104	false
2019-11-17T16:00Z	1.103	false
2019-11-17T15:45Z	1.103	false
2019-11-17T15:30Z	1.104	false
2019-11-17T15:15Z	1.105	false
2019-11-17T15:00Z	1.105	false
2019-11-17T14:45Z	1.105	false
2019-11-17T14:30Z	1.105	false
2019-11-17T14:15Z	1.105	false
2019-11-17T14:00Z	1.105	false
2019-11-17T13:45Z	1.104	false
2019-11-17T13:30Z	1.103	false
2019-11-17T13:15Z	1.102	false
2019-11-17T13:00Z	1.101	false
2019-11-17T12:45Z	1.102	false
2019-11-17T12:30Z	1.1	false
2019-11-17T12:15Z	1.101	false
2019-11-17T12:00Z	1.101	false
2019-11-17T11:45Z	1.101	false
2019-11-17T11:30Z	1.1	false
2019-11-17T11:15Z	1.102	false
2019-11-17T11:00Z	1.102	false
2019-11-17T10:45Z	1.102	false
2019-11-17T10:30Z	1.104	false
2019-11-17T10:15Z	1.105	false
2019-11-17T10:00Z	1.105	false
2019-11-17T09:45Z	1.106	false
2019-11-17T09:30Z	1.106	false
2019-11-17T09:15Z	1.108	false
2019-11-17T09:00Z	1.106	false
2019-11-17T08:45Z	1.107	false
2019-11-17T08:30Z	1.107	false
2019-11-17T08:15Z	1.108	false
2019-11-17T08:00Z	1.108	false
2019-11-17T07:45Z	1.107	false
2019-11-17T07:30Z	1.108	false
2019-11-17T07:15Z	1.108	false
2019-11-17T07:00Z	1.108	false
2019-11-17T06:45Z	1.108	false
2019-11-17T06:30Z	1.109	false
2019-11-17T06:15Z	1.11	false
2019-11-17T06:00Z	1.109	false
2019-11-17T05:45Z	1.108	false
2019-11-17T05:30Z	1.109	false
2019-11-17T05:15Z	1.109	false
2019-11-17T05:00Z	1.109	false
2019-11-17T04:45Z	1.109	false
2019-11-17T04:30Z	1.11	false
2019-11-17T04:15Z	1.109	false
2019-11-17T04:00Z	1.108	false
2019-11-17T03:45Z	1.109	false
2019-11-17T03:30Z	1.109	false
2019-11-17T03:15Z	1.108	false
2019-11-17T03:00Z	1.108	false
2019-11-17T02:45Z	1.109	false
2019-11-17T02:30Z	1.109	false
2019-11-17T02:15Z	1.11	false
2019-11-17T02:00Z	1.111	false
2019-11-17T01:45Z	1.11	false
2019-11-17T01:30Z	1.111	false
2019-11-17T01:15Z	1.111	false
2019-11-17T01:00Z	1.114	false
2019-11-17T00:45Z	1.113	false
2019-11-17T00:30Z	1.114	false
2019-11-17T00:15Z	1.113	false
2019-11-17T00:00Z	1.114	false
2019-11-16T23:45Z	1.115	false
2019-11-16T23:30Z	1.116	false
2019-11-16T23:15Z	1.114	false
2019-11-16T23:00Z	1.115	false
2019-11-16T22:45Z	1.115	false
2019-11-16T22:30Z	1.115	false
2019-11-16T22:15Z	1.115	false
2019-11-16T22:00Z	1.115	false
2019-11-16T21:45Z	1.116	false
2019-11-16T21:30Z	1.116	false
2019-11-16T21:15Z	1.116	false
2019-11-16T21:00Z	1.119	false
2019-11-16T20:45Z	1.118	false
2019-11-16T20:30Z	1.119	false
2019-11-16T20:15Z	1.119	false
2019-11-16T20:00Z	1.12	false
2019-11-16T19:45Z	1.121	false
2019-11-16T19:30Z	1.12	false
2019-11-16T19:15Z	1.121	false
2019-11-16T19:00Z	1.121	false
2019-11-16T18:45Z	1.122	false
2019-11-16T18:30Z	1.122	false
2019-11-16T18:15Z	1.122	false
2019-11-16T18:00Z	1.123	false
2019-11-16T17:45Z	1.123	false
2019-11-16T17:30Z	1.123	false
2019-11-16T17:15Z	1.123	false
2019-11-16T17:00Z	1.123	false
2019-11-16T16:45Z	1.124	false
2019-11-16T16:30Z	1.124	false
2019-11-16T16:15Z	1.125	false
2019-11-16T16:00Z	1.125	false
2019-11-16T15:45Z	1.127	false
2019-11-16T15:30Z	1.126	false
2019-11-16T15:15Z	1.127	false
2019-11-16T15:00Z	1.128	false
2019-11-16T14:45Z	1.127	false
2019-11-16T14:30Z	1.127	false
2019-11-16T14:15Z	1.126	false
2019-11-16T14:00Z	1.125	false
2019-11-16T13:45Z	1.124	false
2019-11-16T13:30Z	1.125	false
2019-11-16T13:15Z	1.125	false
2019-11-16T13:00Z	1.126	false
2019-11-16T12:45Z	1.126	false
2019-11-16T12:30Z	1.127	false
2019-11-16T12:15Z	1.127	false
2019-11-16T12:00Z	1.128	false
2019-11-16T11:45Z	1.129	false
2019-11-16T11:30Z	1.13	false
2019-11-16T11:15Z	1.131	false
2019-11-16T11:00Z	1.132	false
2019-11-16T10:45Z	1.133	false
2019-11-16T10:30Z	1.133	false
2019-11-16T10:15Z	1.134	false
2019-11-16T10:00Z	1.134	false
2019-11-16T09:45Z	1.134	false
2019-11-16T09:30Z	1.134	false
2019-11-16T09:15Z	1.134	false
2019-11-16T09:00Z	1.134	false
2019-11-16T08:45Z	1.134	false
2019-11-16T08:30Z	1.135	false
2019-11-16T08:15Z	1.135	false
2019-11-16T08:00Z	1.136	false
2019-11-16T07:45Z	1.133	false
2019-11-16T07:30Z	1.133	false
2019-11-16T07:15Z	1.131	false
2019-11-16T07:00Z	1.131	false
2019-11-16T06:45Z	1.13	false
2019-11-16T06:30Z	1.13	false
2019-11-16T06:15Z	1.131	false
2019-11-16T06:00Z	1.132	false
2019-11-16T05:45Z	1.132	false
2019-11-16T05:30Z	1.133	false
2019-11-16T05:15Z	1.134	false
2019-11-16T05:00Z	1.134	false
2019-11-16T04:45Z	1.135	false
2019-11-16T04:30Z	1.135	false
2019-11-16T04:15Z	1.136	false
2019-11-16T04:00Z	1.136	false
2019-11-16T03:45Z	1.137	false
2019-11-16T03:30Z	1.138	false
2019-11-16T03:15Z	1.138	false
2019-11-16T03:00Z	1.139	false
2019-11-16T02:45Z	1.14	false
2019-11-16T02:30Z	1.141	false
2019-11-16T02:15Z	1.142	false
2019-11-16T02:00Z	1.142	false
2019-11-16T01:45Z	1.143	false
2019-11-16T01:30Z	1.144	false
2019-11-16T01:15Z	1.145	false
2019-11-16T01:00Z	1.146	false
2019-11-16T00:45Z	1.145	false
2019-11-16T00:30Z	1.146	false
2019-11-16T00:15Z	1.147	false
2019-11-16T00:00Z	1.148	false
2019-11-15T23:45Z	1.149	false
2019-11-15T23:30Z	1.15	false
2019-11-15T23:15Z	1.151	false
2019-11-15T23:00Z	1.152	false
2019-11-15T22:45Z	1.153	false
2019-11-15T22:30Z	1.154	false
2019-11-15T22:15Z	1.155	false
2019-11-15T22:00Z	1.156	false
2019-11-15T21:45Z	1.157	false
2019-11-15T21:30Z	1.158	false
2019-11-15T21:15Z	1.159	false
2019-11-15T21:00Z	1.16	false
2019-11-15T20:45Z	1.161	false
2019-11-15T20:30Z	1.162	false
2019-11-15T20:15Z	1.163	false
2019-11-15T20:00Z	1.164	false
2019-11-15T19:45Z	1.165	false
2019-11-15T19:30Z	1.166	false
2019-11-15T19:15Z	1.167	false
2019-11-15T19:00Z	1.168	false
2019-11-15T18:45Z	1.169	false
2019-11-15T18:30Z	1.17	false
2019-11-15T18:15Z	1.171	false
2019-11-15T18:00Z	1.173	false
2019-11-15T17:45Z	1.174	false
2019-11-15T17:30Z	1.176	false
2019-11-15T17:15Z	1.177	false
2019-11-15T17:00Z	1.178	false
2019-11-15T16:45Z	1.18	false
2019-11-15T16:30Z	1.181	false
2019-11-15T16:15Z	1.183	false
2019-11-15T16:00Z	1.184	false
2019-11-15T15:45Z	1.186	false
2019-11-15T15:30Z	1.187	false
2019-11-15T15:15Z	1.188	false
2019-11-15T15:00Z	1.19	false
2019-11-15T14:45Z	1.192	false
2019-11-15T14:30Z	1.193	false
2019-11-15T14:15Z	1.195	false
2019-11-15T14:00Z	1.196	false
2019-11-15T13:45Z	1.198	false
2019-11-15T13:30Z	1.2	false
2019-11-15T13:15Z	1.203	false
2019-11-15T13:00Z	1.207	false
2019-11-15T12:45Z	1.214	false
2019-11-15T12:30Z	1.228	false
2019-11-15T12:15Z	1.242	false
2019-11-15T12:00Z	1.244	false
2019-11-15T11:45Z	1.247	false
2019-11-15T11:30Z	1.25	false
2019-11-15T11:15Z	1.253	false
2019-11-15T11:00Z	1.256	false
2019-11-15T10:45Z	1.26	false
2019-11-15T10:30Z	1.264	false
2019-11-15T10:15Z	1.266	false
2019-11-15T10:00Z	1.267	false
2019-11-15T09:45Z	1.272	false
2019-11-15T09:30Z	1.275	false
2019-11-15T09:15Z	1.278	false
2019-11-15T09:00Z	1.28	false
2019-11-15T08:45Z	1.281	false
2019-11-15T08:30Z	1.284	false
2019-11-15T08:15Z	1.285	false
2019-11-15T08:00Z	1.287	false
2019-11-15T07:45Z	1.292	false
2019-11-15T07:30Z	1.294	false
2019-11-15T07:15Z	1.296	false
2019-11-15T07:00Z	1.299	false
2019-11-15T06:45Z	1.301	false
2019-11-15T06:30Z	1.304	false
2019-11-15T06:15Z	1.307	false
2019-11-15T06:00Z	1.308	false
2019-11-15T05:45Z	1.31	false
2019-11-15T05:30Z	1.312	false
2019-11-15T05:15Z	1.314	false
2019-11-15T05:00Z	1.315	false
2019-11-15T04:45Z	1.316	false
2019-11-15T04:30Z	1.319	false
2019-11-15T04:15Z	1.321	false
2019-11-15T04:00Z	1.32	false
2019-11-15T03:45Z	1.322	false
2019-11-15T03:30Z	1.324	false
2019-11-15T03:15Z	1.325	false
2019-11-15T03:00Z	1.326	false
2019-11-15T02:45Z	1.328	false
2019-11-15T02:30Z	1.33	false
2019-11-15T02:15Z	1.332	false
2019-11-15T02:00Z	1.332	false
2019-11-15T01:45Z	1.333	false
2019-11-15T01:30Z	1.335	false
2019-11-15T01:15Z	1.335	false
2019-11-15T01:00Z	1.336	false
2019-11-15T00:45Z	1.336	false
2019-11-15T00:30Z	1.336	false
2019-11-15T00:15Z	1.337	false
2019-11-15T00:00Z	1.337	false
2019-11-14T23:45Z	1.337	false
2019-11-14T23:30Z	1.337	false
2019-11-14T23:15Z	1.337	false
2019-11-14T23:00Z	1.335	false
2019-11-14T22:45Z	1.333	false
2019-11-14T22:30Z	1.329	false
2019-11-14T22:15Z	1.323	false
2019-11-14T22:00Z	1.313	false
2019-11-14T21:45Z	1.307	false
2019-11-14T21:30Z	1.297	false
2019-11-14T21:15Z	1.287	false
2019-11-14T21:00Z	1.274	false
2019-11-14T20:45Z	1.258	false
2019-11-14T20:30Z	1.192	false
2019-11-14T20:15Z	1.177	false
2019-11-14T20:00Z	1.166	false
2019-11-14T19:45Z	1.158	false
2019-11-14T19:30Z	1.154	false
2019-11-14T19:15Z	1.152	false
2019-11-14T19:00Z	1.152	false
2019-11-14T18:45Z	1.152	false
2019-11-14T18:30Z	1.153	false
2019-11-14T18:15Z	1.153	false
2019-11-14T18:00Z	1.154	false
2019-11-14T17:45Z	1.155	false
2019-11-14T17:30Z	1.155	false
2019-11-14T17:15Z	1.155	false
2019-11-14T17:00Z	1.156	false
2019-11-14T16:45Z	1.156	false
2019-11-14T16:30Z	1.156	false
2019-11-14T16:15Z	1.157	false
2019-11-14T16:00Z	1.157	false
2019-11-14T15:45Z	1.157	false
2019-11-14T15:30Z	1.155	false
2019-11-14T15:15Z	1.153	false
2019-11-14T15:00Z	1.15	false
2019-11-14T14:45Z	1.147	false
2019-11-14T14:30Z	1.144	false
2019-11-14T14:15Z	1.141	false
2019-11-14T14:00Z	1.136	false
2019-11-14T13:45Z	1.132	false
2019-11-14T13:30Z	1.128	false
2019-11-14T13:15Z	1.124	false
2019-11-14T13:00Z	1.12	false
2019-11-14T12:45Z	1.116	false
2019-11-14T12:30Z	1.112	false
2019-11-14T12:15Z	1.109	false
2019-11-14T12:00Z	1.107	false
2019-11-14T11:45Z	1.104	false
2019-11-14T11:30Z	1.102	false
2019-11-14T11:15Z	1.101	false
2019-11-14T11:00Z	1.099	false
2019-11-14T10:45Z	1.099	false
2019-11-14T10:30Z	1.098	false
2019-11-14T10:15Z	1.098	false
2019-11-14T10:00Z	1.099	false
2019-11-14T09:45Z	1.099	false
2019-11-14T09:30Z	1.1	false
2019-11-14T09:15Z	1.1	false
2019-11-14T09:00Z	1.101	false
2019-11-14T08:45Z	1.102	false
2019-11-14T08:30Z	1.103	false
2019-11-14T08:15Z	1.104	false
2019-11-14T08:00Z	1.105	false
2019-11-14T07:45Z	1.106	false
2019-11-14T07:30Z	1.107	false
2019-11-14T07:15Z	1.109	false
2019-11-14T07:00Z	1.109	false
2019-11-14T06:45Z	1.11	false
2019-11-14T06:30Z	1.111	false
2019-11-14T06:15Z	1.112	false
2019-11-14T06:00Z	1.112	false
2019-11-14T05:45Z	1.112	false
2019-11-14T05:30Z	1.113	false
2019-11-14T05:15Z	1.112	false
2019-11-14T05:00Z	1.11	false
2019-11-14T04:45Z	1.109	false
2019-11-14T04:30Z	1.107	false
2019-11-14T04:15Z	1.104	false
2019-11-14T04:00Z	1.1	false
2019-11-14T03:45Z	1.097	false
2019-11-14T03:30Z	1.095	false
2019-11-14T03:15Z	1.092	false
2019-11-14T03:00Z	1.09	false
2019-11-14T02:45Z	1.089	false
2019-11-14T02:30Z	1.088	false
2019-11-14T02:15Z	1.088	false
2019-11-14T02:00Z	1.087	false
2019-11-14T01:45Z	1.086	false
2019-11-14T01:30Z	1.085	false
2019-11-14T01:15Z	1.085	false
2019-11-14T01:00Z	1.084	false
2019-11-14T00:45Z	1.084	false
2019-11-14T00:30Z	1.085	false
2019-11-14T00:15Z	1.084	false
2019-11-14T00:00Z	1.084	false
2019-11-13T23:45Z	1.084	false
2019-11-13T23:30Z	1.084	false
2019-11-13T23:15Z	1.085	false
2019-11-13T23:00Z	1.085	false
2019-11-13T22:45Z	1.085	false
2019-11-13T22:30Z	1.085	false
2019-11-13T22:15Z	1.085	false
2019-11-13T22:00Z	1.085	false
2019-11-13T21:45Z	1.085	false
2019-11-13T21:30Z	1.086	false
2019-11-13T21:15Z	1.086	false
2019-11-13T21:00Z	1.085	false
2019-11-13T20:45Z	1.086	false
2019-11-13T20:30Z	1.086	false
2019-11-13T20:15Z	1.086	false
2019-11-13T20:00Z	1.086	false
2019-11-13T19:45Z	1.086	false
2019-11-13T19:30Z	1.086	false
2019-11-13T19:15Z	1.086	false
2019-11-13T19:00Z	1.086	false
2019-11-13T18:45Z	1.087	false
2019-11-13T18:30Z	1.087	false
2019-11-13T18:15Z	1.088	false
2019-11-13T18:00Z	1.087	false
2019-11-13T17:45Z	1.087	false
2019-11-13T17:30Z	1.087	false
2019-11-13T17:15Z	1.087	false
2019-11-13T17:00Z	1.09	false
2019-11-13T16:45Z	1.091	false
2019-11-13T16:30Z	1.09	false
2019-11-13T16:15Z	1.09	false
2019-11-13T16:00Z	1.091	false
2019-11-13T15:45Z	1.091	false
2019-11-13T15:30Z	1.091	false
2019-11-13T15:15Z	1.091	false
2019-11-13T15:00Z	1.091	false
2019-11-13T14:45Z	1.092	false
2019-11-13T14:30Z	1.092	false
2019-11-13T14:15Z	1.092	false
2019-11-13T14:00Z	1.092	false
2019-11-13T13:45Z	1.092	false
2019-11-13T13:30Z	1.092	false
2019-11-13T13:15Z	1.093	false
2019-11-13T13:00Z	1.093	false
2019-11-13T12:45Z	1.093	false
2019-11-13T12:30Z	1.094	false
2019-11-13T12:15Z	1.094	false
2019-11-13T12:00Z	1.094	false
2019-11-13T11:45Z	1.094	false
2019-11-13T11:30Z	1.094	false
2019-11-13T11:15Z	1.095	false
2019-11-13T11:00Z	1.095	false
2019-11-13T10:45Z	1.096	false
2019-11-13T10:30Z	1.096	false
2019-11-13T10:15Z	1.096	false
2019-11-13T10:00Z	1.096	false
2019-11-13T09:45Z	1.097	false
2019-11-13T09:30Z	1.097	false
2019-11-13T09:15Z	1.098	false
2019-11-13T09:00Z	1.098	false
2019-11-13T08:45Z	1.099	false
2019-11-13T08:30Z	1.099	false
2019-11-13T08:15Z	1.099	false
2019-11-13T08:00Z	1.1	false
2019-11-13T07:45Z	1.1	false
2019-11-13T07:30Z	1.099	false
2019-11-13T07:15Z	1.1	false
2019-11-13T07:00Z	1.101	false
2019-11-13T06:45Z	1.101	false
2019-11-13T06:30Z	1.101	false
2019-11-13T06:15Z	1.101	false
2019-11-13T06:00Z	1.101	false
2019-11-13T05:45Z	1.101	false
2019-11-13T05:30Z	1.102	false
2019-11-13T05:15Z	1.102	false
2019-11-13T05:00Z	1.102	false
2019-11-13T04:45Z	1.103	false
2019-11-13T04:30Z	1.103	false
2019-11-13T04:15Z	1.103	false
2019-11-13T04:00Z	1.103	false
2019-11-13T03:45Z	1.104	false
2019-11-13T03:30Z	1.104	false
2019-11-13T03:15Z	1.105	false
2019-11-13T03:00Z	1.105	false
2019-11-13T02:45Z	1.105	false
2019-11-13T02:30Z	1.106	false
2019-11-13T02:15Z	1.106	false
2019-11-13T02:00Z	1.107	false
2019-11-13T01:45Z	1.108	false
2019-11-13T01:30Z	1.108	false
2019-11-13T01:15Z	1.108	false
2019-11-13T01:00Z	1.109	false
2019-11-13T00:45Z	1.109	false
2019-11-13T00:30Z	1.11	false
2019-11-13T00:15Z	1.11	false
2019-11-13T00:00Z	1.111	false
2019-11-12T23:45Z	1.111	false
2019-11-12T23:30Z	1.111	false
2019-11-12T23:15Z	1.112	false
2019-11-12T23:00Z	1.113	false
2019-11-12T22:45Z	1.114	false
2019-11-12T22:30Z	1.114	false
2019-11-12T22:15Z	1.115	false
2019-11-12T22:00Z	1.116	false
2019-11-12T21:45Z	1.116	false
2019-11-12T21:30Z	1.116	false
2019-11-12T21:15Z	1.117	false
2019-11-12T21:00Z	1.118	false
2019-11-12T20:45Z	1.118	false
2019-11-12T20:30Z	1.119	false
2019-11-12T20:15Z	1.119	false
2019-11-12T20:00Z	1.12	false
2019-11-12T19:45Z	1.121	false
2019-11-12T19:30Z	1.121	false
2019-11-12T19:15Z	1.122	false
2019-11-12T19:00Z	1.123	false
2019-11-12T18:45Z	1.123	false
2019-11-12T18:30Z	1.124	false
2019-11-12T18:15Z	1.125	false

Forecast data

November 17th 2019, 6:00:00 pm	1.105
November 17th 2019, 6:15:00 pm	1.106
November 17th 2019, 6:30:00 pm	1.108
November 17th 2019, 6:45:00 pm	1.109
November 17th 2019, 7:00:00 pm	1.110
November 17th 2019, 7:15:00 pm	1.111
November 17th 2019, 7:30:00 pm	1.112
November 17th 2019, 7:45:00 pm	1.114
November 17th 2019, 8:00:00 pm	1.115
November 17th 2019, 8:15:00 pm	1.116
November 17th 2019, 8:30:00 pm	1.117
November 17th 2019, 8:45:00 pm	1.118
November 17th 2019, 9:00:00 pm	1.119
November 17th 2019, 9:15:00 pm	1.120
November 17th 2019, 9:30:00 pm	1.121
November 17th 2019, 9:45:00 pm	1.122
November 17th 2019, 10:00:00 pm	1.123
November 17th 2019, 10:15:00 pm	1.124
November 17th 2019, 10:30:00 pm	1.125
November 17th 2019, 10:45:00 pm	1.126
November 17th 2019, 11:00:00 pm	1.127
November 17th 2019, 11:15:00 pm	1.127
November 17th 2019, 11:30:00 pm	1.128
November 17th 2019, 11:45:00 pm	1.129
November 18th 2019, 12:00:00 am	1.130
November 18th 2019, 12:15:00 am	1.131
November 18th 2019, 12:30:00 am	1.132
November 18th 2019, 12:45:00 am	1.133
November 18th 2019, 1:00:00 am	1.133
November 18th 2019, 1:15:00 am	1.134
November 18th 2019, 1:30:00 am	1.135
November 18th 2019, 1:45:00 am	1.136
November 18th 2019, 2:00:00 am	1.136
November 18th 2019, 2:15:00 am	1.137
November 18th 2019, 2:30:00 am	1.138
November 18th 2019, 2:45:00 am	1.139
November 18th 2019, 3:00:00 am	1.139
November 18th 2019, 3:15:00 am	1.140
November 18th 2019, 3:30:00 am	1.141
November 18th 2019, 3:45:00 am	1.142
November 18th 2019, 4:00:00 am	1.142
November 18th 2019, 4:15:00 am	1.143
November 18th 2019, 4:30:00 am	1.144
November 18th 2019, 4:45:00 am	1.144
November 18th 2019, 5:00:00 am	1.145
November 18th 2019, 5:15:00 am	1.146
November 18th 2019, 5:30:00 am	1.146
November 18th 2019, 5:45:00 am	1.147
November 18th 2019, 6:00:00 am	1.147
November 18th 2019, 6:15:00 am	1.148
November 18th 2019, 6:30:00 am	1.149
November 18th 2019, 6:45:00 am	1.149
November 18th 2019, 7:00:00 am	1.150
November 18th 2019, 7:15:00 am	1.150
November 18th 2019, 7:30:00 am	1.151
November 18th 2019, 7:45:00 am	1.152
November 18th 2019, 8:00:00 am	1.152
November 18th 2019, 8:15:00 am	1.153
November 18th 2019, 8:30:00 am	1.153
November 18th 2019, 8:45:00 am	1.154
November 18th 2019, 9:00:00 am	1.154
November 18th 2019, 9:15:00 am	1.155
November 18th 2019, 9:30:00 am	1.155
November 18th 2019, 9:45:00 am	1.156
November 18th 2019, 10:00:00 am	1.156
November 18th 2019, 10:15:00 am	1.157
November 18th 2019, 10:30:00 am	1.157
November 18th 2019, 10:45:00 am	1.158
November 18th 2019, 11:00:00 am	1.158
November 18th 2019, 11:15:00 am	1.159
November 18th 2019, 11:30:00 am	1.159
November 18th 2019, 11:45:00 am	1.159
November 18th 2019, 12:00:00 pm	1.160
November 18th 2019, 12:15:00 pm	1.160
November 18th 2019, 12:30:00 pm	1.161
November 18th 2019, 12:45:00 pm	1.161
November 18th 2019, 1:00:00 pm	1.162
November 18th 2019, 1:15:00 pm	1.162
November 18th 2019, 1:30:00 pm	1.162
November 18th 2019, 1:45:00 pm	1.163
November 18th 2019, 2:00:00 pm	1.163
November 18th 2019, 2:15:00 pm	1.164
November 18th 2019, 2:30:00 pm	1.164
November 18th 2019, 2:45:00 pm	1.164
November 18th 2019, 3:00:00 pm	1.165
November 18th 2019, 3:15:00 pm	1.165
November 18th 2019, 3:30:00 pm	1.166
November 18th 2019, 3:45:00 pm	1.166
November 18th 2019, 4:00:00 pm	1.166
November 18th 2019, 4:15:00 pm	1.167
November 18th 2019, 4:30:00 pm	1.167
November 18th 2019, 4:45:00 pm	1.167
November 18th 2019, 5:00:00 pm	1.168
November 18th 2019, 5:15:00 pm	1.168
November 18th 2019, 5:30:00 pm	1.168
November 18th 2019, 5:45:00 pm	1.169
November 18th 2019, 6:00:00 pm	1.169
November 18th 2019, 6:15:00 pm	1.169
November 18th 2019, 6:30:00 pm	1.170
November 18th 2019, 6:45:00 pm	1.170
November 18th 2019, 7:00:00 pm	1.170
November 18th 2019, 7:15:00 pm	1.170
November 18th 2019, 7:30:00 pm	1.171
November 18th 2019, 7:45:00 pm	1.171
November 18th 2019, 8:00:00 pm	1.171
November 18th 2019, 8:15:00 pm	1.172
November 18th 2019, 8:30:00 pm	1.172
November 18th 2019, 8:45:00 pm	1.172
November 18th 2019, 9:00:00 pm	1.172
November 18th 2019, 9:15:00 pm	1.173
November 18th 2019, 9:30:00 pm	1.173
November 18th 2019, 9:45:00 pm	1.173
November 18th 2019, 10:00:00 pm	1.173
November 18th 2019, 10:15:00 pm	1.174
November 18th 2019, 10:30:00 pm	1.174
November 18th 2019, 10:45:00 pm	1.174
November 18th 2019, 11:00:00 pm	1.174
November 18th 2019, 11:15:00 pm	1.175
November 18th 2019, 11:30:00 pm	1.175
November 18th 2019, 11:45:00 pm	1.175
November 19th 2019, 12:00:00 am	1.175
November 19th 2019, 12:15:00 am	1.176
November 19th 2019, 12:30:00 am	1.176
November 19th 2019, 12:45:00 am	1.176
November 19th 2019, 1:00:00 am	1.176
November 19th 2019, 1:15:00 am	1.177
November 19th 2019, 1:30:00 am	1.177
November 19th 2019, 1:45:00 am	1.177
November 19th 2019, 2:00:00 am	1.177
November 19th 2019, 2:15:00 am	1.177
November 19th 2019, 2:30:00 am	1.178
November 19th 2019, 2:45:00 am	1.178
November 19th 2019, 3:00:00 am	1.178
November 19th 2019, 3:15:00 am	1.178
November 19th 2019, 3:30:00 am	1.178
November 19th 2019, 3:45:00 am	1.179
November 19th 2019, 4:00:00 am	1.179
November 19th 2019, 4:15:00 am	1.179
November 19th 2019, 4:30:00 am	1.179
November 19th 2019, 4:45:00 am	1.179
November 19th 2019, 5:00:00 am	1.179
November 19th 2019, 5:15:00 am	1.180
November 19th 2019, 5:30:00 am	1.180
November 19th 2019, 5:45:00 am	1.180
November 19th 2019, 6:00:00 am	1.180

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 1.50m.

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 1.18m at 5:15am Tuesday 19 November 2019.

Highest level recorded at this location

2.72m on 30 October 2000

View nearby measuring stations