River level River Colne at London Colney

Check for flood warnings in this area

Latest recorded level 1.16m at 4:30am Tuesday 19 March 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
2019-03-19T04:30Z	1.158	false
2019-03-19T04:15Z	1.159	false
2019-03-19T04:00Z	1.16	false
2019-03-19T03:45Z	1.161	false
2019-03-19T03:30Z	1.16	false
2019-03-19T03:15Z	1.161	false
2019-03-19T03:00Z	1.161	false
2019-03-19T02:45Z	1.162	false
2019-03-19T02:30Z	1.163	false
2019-03-19T02:15Z	1.164	false
2019-03-19T02:00Z	1.164	false
2019-03-19T01:45Z	1.164	false
2019-03-19T01:30Z	1.165	false
2019-03-19T01:15Z	1.165	false
2019-03-19T01:00Z	1.166	false
2019-03-19T00:45Z	1.167	false
2019-03-19T00:30Z	1.167	false
2019-03-19T00:15Z	1.167	false
2019-03-19T00:00Z	1.168	false
2019-03-18T23:45Z	1.168	false
2019-03-18T23:30Z	1.169	false
2019-03-18T23:15Z	1.169	false
2019-03-18T23:00Z	1.17	false
2019-03-18T22:45Z	1.17	false
2019-03-18T22:30Z	1.172	false
2019-03-18T22:15Z	1.173	false
2019-03-18T22:00Z	1.174	false
2019-03-18T21:45Z	1.174	false
2019-03-18T21:30Z	1.175	false
2019-03-18T21:15Z	1.176	false
2019-03-18T21:00Z	1.177	false
2019-03-18T20:45Z	1.178	false
2019-03-18T20:30Z	1.178	false
2019-03-18T20:15Z	1.178	false
2019-03-18T20:00Z	1.179	false
2019-03-18T19:45Z	1.18	false
2019-03-18T19:30Z	1.18	false
2019-03-18T19:15Z	1.181	false
2019-03-18T19:00Z	1.181	false
2019-03-18T18:45Z	1.182	false
2019-03-18T18:30Z	1.182	false
2019-03-18T18:15Z	1.183	false
2019-03-18T18:00Z	1.183	false
2019-03-18T17:45Z	1.183	false
2019-03-18T17:30Z	1.183	false
2019-03-18T17:15Z	1.183	false
2019-03-18T17:00Z	1.184	false
2019-03-18T16:45Z	1.185	false
2019-03-18T16:30Z	1.185	false
2019-03-18T16:15Z	1.186	false
2019-03-18T16:00Z	1.186	false
2019-03-18T15:45Z	1.187	false
2019-03-18T15:30Z	1.188	false
2019-03-18T15:15Z	1.189	false
2019-03-18T15:00Z	1.19	false
2019-03-18T14:45Z	1.19	false
2019-03-18T14:30Z	1.191	false
2019-03-18T14:15Z	1.192	false
2019-03-18T14:00Z	1.192	false
2019-03-18T13:45Z	1.194	false
2019-03-18T13:30Z	1.195	false
2019-03-18T13:15Z	1.196	false
2019-03-18T13:00Z	1.198	false
2019-03-18T12:45Z	1.2	false
2019-03-18T12:30Z	1.202	false
2019-03-18T12:15Z	1.203	false
2019-03-18T12:00Z	1.206	false
2019-03-18T11:45Z	1.207	false
2019-03-18T11:30Z	1.209	false
2019-03-18T11:15Z	1.211	false
2019-03-18T11:00Z	1.213	false
2019-03-18T10:45Z	1.215	false
2019-03-18T10:30Z	1.217	false
2019-03-18T10:15Z	1.219	false
2019-03-18T10:00Z	1.22	false
2019-03-18T09:45Z	1.222	false
2019-03-18T09:30Z	1.222	false
2019-03-18T09:15Z	1.223	false
2019-03-18T09:00Z	1.225	false
2019-03-18T08:45Z	1.226	false
2019-03-18T08:30Z	1.227	false
2019-03-18T08:15Z	1.229	false
2019-03-18T08:00Z	1.233	false
2019-03-18T07:45Z	1.234	false
2019-03-18T07:30Z	1.235	false
2019-03-18T07:15Z	1.237	false
2019-03-18T07:00Z	1.238	false
2019-03-18T06:45Z	1.24	false
2019-03-18T06:30Z	1.241	false
2019-03-18T06:15Z	1.243	false
2019-03-18T06:00Z	1.246	false
2019-03-18T05:45Z	1.25	false
2019-03-18T05:30Z	1.251	false
2019-03-18T05:15Z	1.252	false
2019-03-18T05:00Z	1.254	false
2019-03-18T04:45Z	1.253	false
2019-03-18T04:30Z	1.255	false
2019-03-18T04:15Z	1.257	false
2019-03-18T04:00Z	1.257	false
2019-03-18T03:45Z	1.259	false
2019-03-18T03:30Z	1.26	false
2019-03-18T03:15Z	1.262	false
2019-03-18T03:00Z	1.262	false
2019-03-18T02:45Z	1.264	false
2019-03-18T02:30Z	1.266	false
2019-03-18T02:15Z	1.267	false
2019-03-18T02:00Z	1.269	false
2019-03-18T01:45Z	1.27	false
2019-03-18T01:30Z	1.271	false
2019-03-18T01:15Z	1.272	false
2019-03-18T01:00Z	1.274	false
2019-03-18T00:45Z	1.275	false
2019-03-18T00:30Z	1.276	false
2019-03-18T00:15Z	1.277	false
2019-03-18T00:00Z	1.279	false
2019-03-17T23:45Z	1.28	false
2019-03-17T23:30Z	1.282	false
2019-03-17T23:15Z	1.283	false
2019-03-17T23:00Z	1.283	false
2019-03-17T22:45Z	1.284	false
2019-03-17T22:30Z	1.286	false
2019-03-17T22:15Z	1.288	false
2019-03-17T22:00Z	1.289	false
2019-03-17T21:45Z	1.291	false
2019-03-17T21:30Z	1.292	false
2019-03-17T21:15Z	1.294	false
2019-03-17T21:00Z	1.296	false
2019-03-17T20:45Z	1.297	false
2019-03-17T20:30Z	1.299	false
2019-03-17T20:15Z	1.3	false
2019-03-17T20:00Z	1.303	false
2019-03-17T19:45Z	1.304	false
2019-03-17T19:30Z	1.305	false
2019-03-17T19:15Z	1.306	false
2019-03-17T19:00Z	1.307	false
2019-03-17T18:45Z	1.31	false
2019-03-17T18:30Z	1.31	false
2019-03-17T18:15Z	1.312	false
2019-03-17T18:00Z	1.313	false
2019-03-17T17:45Z	1.314	false
2019-03-17T17:30Z	1.315	false
2019-03-17T17:15Z	1.316	false
2019-03-17T17:00Z	1.318	false
2019-03-17T16:45Z	1.319	false
2019-03-17T16:30Z	1.32	false
2019-03-17T16:15Z	1.321	false
2019-03-17T16:00Z	1.323	false
2019-03-17T15:45Z	1.324	false
2019-03-17T15:30Z	1.325	false
2019-03-17T15:15Z	1.326	false
2019-03-17T15:00Z	1.329	false
2019-03-17T14:45Z	1.33	false
2019-03-17T14:30Z	1.333	false
2019-03-17T14:15Z	1.332	false
2019-03-17T14:00Z	1.334	false
2019-03-17T13:45Z	1.335	false
2019-03-17T13:30Z	1.335	false
2019-03-17T13:15Z	1.337	false
2019-03-17T13:00Z	1.337	false
2019-03-17T12:45Z	1.338	false
2019-03-17T12:30Z	1.339	false
2019-03-17T12:15Z	1.34	false
2019-03-17T12:00Z	1.34	false
2019-03-17T11:45Z	1.341	false
2019-03-17T11:30Z	1.342	false
2019-03-17T11:15Z	1.343	false
2019-03-17T11:00Z	1.344	false
2019-03-17T10:45Z	1.344	false
2019-03-17T10:30Z	1.343	false
2019-03-17T10:15Z	1.344	false
2019-03-17T10:00Z	1.344	false
2019-03-17T09:45Z	1.343	false
2019-03-17T09:30Z	1.342	false
2019-03-17T09:15Z	1.34	false
2019-03-17T09:00Z	1.34	false
2019-03-17T08:45Z	1.337	false
2019-03-17T08:30Z	1.334	false
2019-03-17T08:15Z	1.33	false
2019-03-17T08:00Z	1.326	false
2019-03-17T07:45Z	1.321	false
2019-03-17T07:30Z	1.311	false
2019-03-17T07:15Z	1.301	false
2019-03-17T07:00Z	1.288	false
2019-03-17T06:45Z	1.274	false
2019-03-17T06:30Z	1.259	false
2019-03-17T06:15Z	1.241	false
2019-03-17T06:00Z	1.2	false
2019-03-17T05:45Z	1.186	false
2019-03-17T05:30Z	1.176	false
2019-03-17T05:15Z	1.168	false
2019-03-17T05:00Z	1.163	false
2019-03-17T04:45Z	1.16	false
2019-03-17T04:30Z	1.158	false
2019-03-17T04:15Z	1.157	false
2019-03-17T04:00Z	1.157	false
2019-03-17T03:45Z	1.157	false
2019-03-17T03:30Z	1.157	false
2019-03-17T03:15Z	1.156	false
2019-03-17T03:00Z	1.157	false
2019-03-17T02:45Z	1.157	false
2019-03-17T02:30Z	1.157	false
2019-03-17T02:15Z	1.158	false
2019-03-17T02:00Z	1.158	false
2019-03-17T01:45Z	1.159	false
2019-03-17T01:30Z	1.16	false
2019-03-17T01:15Z	1.161	false
2019-03-17T01:00Z	1.161	false
2019-03-17T00:45Z	1.163	false
2019-03-17T00:30Z	1.162	false
2019-03-17T00:15Z	1.163	false
2019-03-17T00:00Z	1.165	false
2019-03-16T23:45Z	1.165	false
2019-03-16T23:30Z	1.166	false
2019-03-16T23:15Z	1.166	false
2019-03-16T23:00Z	1.168	false
2019-03-16T22:45Z	1.167	false
2019-03-16T22:30Z	1.169	false
2019-03-16T22:15Z	1.169	false
2019-03-16T22:00Z	1.17	false
2019-03-16T21:45Z	1.17	false
2019-03-16T21:30Z	1.168	false
2019-03-16T21:15Z	1.163	false
2019-03-16T21:00Z	1.159	false
2019-03-16T20:45Z	1.154	false
2019-03-16T20:30Z	1.153	false
2019-03-16T20:15Z	1.154	false
2019-03-16T20:00Z	1.154	false
2019-03-16T19:45Z	1.155	false
2019-03-16T19:30Z	1.154	false
2019-03-16T19:15Z	1.155	false
2019-03-16T19:00Z	1.156	false
2019-03-16T18:45Z	1.157	false
2019-03-16T18:30Z	1.156	false
2019-03-16T18:15Z	1.158	false
2019-03-16T18:00Z	1.158	false
2019-03-16T17:45Z	1.161	false
2019-03-16T17:30Z	1.162	false
2019-03-16T17:15Z	1.164	false
2019-03-16T17:00Z	1.161	false
2019-03-16T16:45Z	1.162	false
2019-03-16T16:30Z	1.159	false
2019-03-16T16:15Z	1.159	false
2019-03-16T16:00Z	1.162	false
2019-03-16T15:45Z	1.16	false
2019-03-16T15:30Z	1.16	false
2019-03-16T15:15Z	1.161	false
2019-03-16T15:00Z	1.161	false
2019-03-16T14:45Z	1.161	false
2019-03-16T14:30Z	1.162	false
2019-03-16T14:15Z	1.164	false
2019-03-16T14:00Z	1.162	false
2019-03-16T13:45Z	1.162	false
2019-03-16T13:30Z	1.163	false
2019-03-16T13:15Z	1.163	false
2019-03-16T13:00Z	1.16	false
2019-03-16T12:45Z	1.16	false
2019-03-16T12:30Z	1.16	false
2019-03-16T12:15Z	1.159	false
2019-03-16T12:00Z	1.158	false
2019-03-16T11:45Z	1.155	false
2019-03-16T11:30Z	1.155	false
2019-03-16T11:15Z	1.155	false
2019-03-16T11:00Z	1.156	false
2019-03-16T10:45Z	1.153	false
2019-03-16T10:30Z	1.153	false
2019-03-16T10:15Z	1.153	false
2019-03-16T10:00Z	1.151	false
2019-03-16T09:45Z	1.151	false
2019-03-16T09:30Z	1.151	false
2019-03-16T09:15Z	1.151	false
2019-03-16T09:00Z	1.153	false
2019-03-16T08:45Z	1.153	false
2019-03-16T08:30Z	1.154	false
2019-03-16T08:15Z	1.155	false
2019-03-16T08:00Z	1.155	false
2019-03-16T07:45Z	1.155	false
2019-03-16T07:30Z	1.156	false
2019-03-16T07:15Z	1.157	false
2019-03-16T07:00Z	1.159	false
2019-03-16T06:45Z	1.159	false
2019-03-16T06:30Z	1.162	false
2019-03-16T06:15Z	1.164	false
2019-03-16T06:00Z	1.164	false
2019-03-16T05:45Z	1.165	false
2019-03-16T05:30Z	1.166	false
2019-03-16T05:15Z	1.167	false
2019-03-16T05:00Z	1.168	false
2019-03-16T04:45Z	1.169	false
2019-03-16T04:30Z	1.169	false
2019-03-16T04:15Z	1.171	false
2019-03-16T04:00Z	1.172	false
2019-03-16T03:45Z	1.173	false
2019-03-16T03:30Z	1.174	false
2019-03-16T03:15Z	1.175	false
2019-03-16T03:00Z	1.177	false
2019-03-16T02:45Z	1.177	false
2019-03-16T02:30Z	1.178	false
2019-03-16T02:15Z	1.179	false
2019-03-16T02:00Z	1.179	false
2019-03-16T01:45Z	1.181	false
2019-03-16T01:30Z	1.183	false
2019-03-16T01:15Z	1.184	false
2019-03-16T01:00Z	1.185	false
2019-03-16T00:45Z	1.186	false
2019-03-16T00:30Z	1.187	false
2019-03-16T00:15Z	1.187	false
2019-03-16T00:00Z	1.189	false
2019-03-15T23:45Z	1.191	false
2019-03-15T23:30Z	1.193	false
2019-03-15T23:15Z	1.196	false
2019-03-15T23:00Z	1.198	false
2019-03-15T22:45Z	1.199	false
2019-03-15T22:30Z	1.201	false
2019-03-15T22:15Z	1.202	false
2019-03-15T22:00Z	1.203	false
2019-03-15T21:45Z	1.203	false
2019-03-15T21:30Z	1.204	false
2019-03-15T21:15Z	1.206	false
2019-03-15T21:00Z	1.207	false
2019-03-15T20:45Z	1.209	false
2019-03-15T20:30Z	1.209	false
2019-03-15T20:15Z	1.21	false
2019-03-15T20:00Z	1.212	false
2019-03-15T19:45Z	1.213	false
2019-03-15T19:30Z	1.213	false
2019-03-15T19:15Z	1.214	false
2019-03-15T19:00Z	1.214	false
2019-03-15T18:45Z	1.216	false
2019-03-15T18:30Z	1.218	false
2019-03-15T18:15Z	1.218	false
2019-03-15T18:00Z	1.219	false
2019-03-15T17:45Z	1.221	false
2019-03-15T17:30Z	1.221	false
2019-03-15T17:15Z	1.223	false
2019-03-15T17:00Z	1.224	false
2019-03-15T16:45Z	1.225	false
2019-03-15T16:30Z	1.228	false
2019-03-15T16:15Z	1.232	false
2019-03-15T16:00Z	1.233	false
2019-03-15T15:45Z	1.235	false
2019-03-15T15:30Z	1.235	false
2019-03-15T15:15Z	1.236	false
2019-03-15T15:00Z	1.237	false
2019-03-15T14:45Z	1.239	false
2019-03-15T14:30Z	1.239	false
2019-03-15T14:15Z	1.238	false
2019-03-15T14:00Z	1.239	false
2019-03-15T13:45Z	1.238	false
2019-03-15T13:30Z	1.241	false
2019-03-15T13:15Z	1.24	false
2019-03-15T13:00Z	1.24	false
2019-03-15T12:45Z	1.244	false
2019-03-15T12:30Z	1.244	false
2019-03-15T12:15Z	1.244	false
2019-03-15T12:00Z	1.244	false
2019-03-15T11:45Z	1.247	false
2019-03-15T11:30Z	1.246	false
2019-03-15T11:15Z	1.248	false
2019-03-15T11:00Z	1.25	false
2019-03-15T10:45Z	1.253	false
2019-03-15T10:30Z	1.251	false
2019-03-15T10:15Z	1.252	false
2019-03-15T10:00Z	1.256	false
2019-03-15T09:45Z	1.257	false
2019-03-15T09:30Z	1.258	false
2019-03-15T09:15Z	1.259	false
2019-03-15T09:00Z	1.259	false
2019-03-15T08:45Z	1.262	false
2019-03-15T08:30Z	1.263	false
2019-03-15T08:15Z	1.264	false
2019-03-15T08:00Z	1.266	false
2019-03-15T07:45Z	1.268	false
2019-03-15T07:30Z	1.269	false
2019-03-15T07:15Z	1.273	false
2019-03-15T07:00Z	1.276	false
2019-03-15T06:45Z	1.277	false
2019-03-15T06:30Z	1.279	false
2019-03-15T06:15Z	1.282	false
2019-03-15T06:00Z	1.283	false
2019-03-15T05:45Z	1.284	false
2019-03-15T05:30Z	1.288	false
2019-03-15T05:15Z	1.29	false
2019-03-15T05:00Z	1.29	false
2019-03-15T04:45Z	1.291	false
2019-03-15T04:30Z	1.294	false
2019-03-15T04:15Z	1.296	false
2019-03-15T04:00Z	1.297	false
2019-03-15T03:45Z	1.298	false
2019-03-15T03:30Z	1.302	false
2019-03-15T03:15Z	1.303	false
2019-03-15T03:00Z	1.305	false
2019-03-15T02:45Z	1.306	false
2019-03-15T02:30Z	1.308	false
2019-03-15T02:15Z	1.309	false
2019-03-15T02:00Z	1.311	false
2019-03-15T01:45Z	1.313	false
2019-03-15T01:30Z	1.314	false
2019-03-15T01:15Z	1.316	false
2019-03-15T01:00Z	1.318	false
2019-03-15T00:45Z	1.32	false
2019-03-15T00:30Z	1.321	false
2019-03-15T00:15Z	1.322	false
2019-03-15T00:00Z	1.323	false
2019-03-14T23:45Z	1.324	false
2019-03-14T23:30Z	1.326	false
2019-03-14T23:15Z	1.327	false
2019-03-14T23:00Z	1.328	false
2019-03-14T22:45Z	1.329	false
2019-03-14T22:30Z	1.329	false
2019-03-14T22:15Z	1.329	false
2019-03-14T22:00Z	1.329	false
2019-03-14T21:45Z	1.329	false
2019-03-14T21:30Z	1.329	false
2019-03-14T21:15Z	1.328	false
2019-03-14T21:00Z	1.326	false
2019-03-14T20:45Z	1.323	false
2019-03-14T20:30Z	1.32	false
2019-03-14T20:15Z	1.317	false
2019-03-14T20:00Z	1.311	false
2019-03-14T19:45Z	1.305	false
2019-03-14T19:30Z	1.298	false
2019-03-14T19:15Z	1.289	false
2019-03-14T19:00Z	1.28	false
2019-03-14T18:45Z	1.27	false
2019-03-14T18:30Z	1.26	false
2019-03-14T18:15Z	1.25	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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