Latest river level information for Colne at London Colney

1:15am Saturday 23 September 2017

Latest level 1m recorded at 7:00pm Friday 22 September 2017.

River levels at this location in the last 5 days

For most river levels the data we collect is fed into this service once or twice a day. We often increase this frequency whenever there is a greater risk of flooding.

Now
▼

2.72m on 30 October 2000 is the highest water level recorded here since the station was opened. Hide from the graph Show on the graph
Flooding is possible over 1.50m

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DateTime	Value	Error
2017-09-22T18:00Z	1	false
2017-09-22T17:45Z	1	false
2017-09-22T17:30Z	1	false
2017-09-22T17:15Z	1	false
2017-09-22T17:00Z	1	false
2017-09-22T16:45Z	1	false
2017-09-22T16:30Z	1	false
2017-09-22T16:15Z	1	false
2017-09-22T16:00Z	1	false
2017-09-22T15:45Z	1	false
2017-09-22T15:30Z	1	false
2017-09-22T15:15Z	1	false
2017-09-22T15:00Z	1	false
2017-09-22T14:45Z	1	false
2017-09-22T14:30Z	1	false
2017-09-22T14:15Z	1	false
2017-09-22T14:00Z	1	false
2017-09-22T13:45Z	1	false
2017-09-22T13:30Z	1	false
2017-09-22T13:15Z	1	false
2017-09-22T13:00Z	1	false
2017-09-22T12:45Z	1	false
2017-09-22T12:30Z	1	false
2017-09-22T12:15Z	1	false
2017-09-22T12:00Z	1	false
2017-09-22T11:45Z	1	false
2017-09-22T11:30Z	1	false
2017-09-22T11:15Z	1.01	false
2017-09-22T11:00Z	1.01	false
2017-09-22T10:45Z	1.01	false
2017-09-22T10:30Z	1.01	false
2017-09-22T10:15Z	1.01	false
2017-09-22T10:00Z	1.01	false
2017-09-22T09:45Z	1.01	false
2017-09-22T09:30Z	1.01	false
2017-09-22T09:15Z	1.01	false
2017-09-22T09:00Z	1.01	false
2017-09-22T08:45Z	1.01	false
2017-09-22T08:30Z	1.01	false
2017-09-22T08:15Z	1.01	false
2017-09-22T08:00Z	1.01	false
2017-09-22T07:45Z	1.01	false
2017-09-22T07:30Z	1.01	false
2017-09-22T07:15Z	1.01	false
2017-09-22T07:00Z	1.01	false
2017-09-22T06:45Z	1.01	false
2017-09-22T06:30Z	1.01	false
2017-09-22T06:15Z	1.01	false
2017-09-22T06:00Z	1.01	false
2017-09-22T05:45Z	1.01	false
2017-09-22T05:30Z	1.01	false
2017-09-22T05:15Z	1.01	false
2017-09-22T05:00Z	1.01	false
2017-09-22T04:45Z	1.01	false
2017-09-22T04:30Z	1.01	false
2017-09-22T04:15Z	1.01	false
2017-09-22T04:00Z	1.01	false
2017-09-22T03:45Z	1.01	false
2017-09-22T03:30Z	1.01	false
2017-09-22T03:15Z	1.01	false
2017-09-22T03:00Z	1.01	false
2017-09-22T02:45Z	1.01	false
2017-09-22T02:30Z	1.01	false
2017-09-22T02:15Z	1.01	false
2017-09-22T02:00Z	1.01	false
2017-09-22T01:45Z	1.01	false
2017-09-22T01:30Z	1.01	false
2017-09-22T01:15Z	1.01	false
2017-09-22T01:00Z	1.01	false
2017-09-22T00:45Z	1.01	false
2017-09-22T00:30Z	1.01	false
2017-09-22T00:15Z	1.01	false
2017-09-22T00:00Z	1.01	false
2017-09-21T23:45Z	1.01	false
2017-09-21T23:30Z	1.01	false
2017-09-21T23:15Z	1.01	false
2017-09-21T23:00Z	1.01	false
2017-09-21T22:45Z	1.01	false
2017-09-21T22:30Z	1.01	false
2017-09-21T22:15Z	1.01	false
2017-09-21T22:00Z	1.01	false
2017-09-21T21:45Z	1.01	false
2017-09-21T21:30Z	1.01	false
2017-09-21T21:15Z	1.01	false
2017-09-21T21:00Z	1.01	false
2017-09-21T20:45Z	1.01	false
2017-09-21T20:30Z	1.01	false
2017-09-21T20:15Z	1.01	false
2017-09-21T20:00Z	1.01	false
2017-09-21T19:45Z	1.01	false
2017-09-21T19:30Z	1.01	false
2017-09-21T19:15Z	1.01	false
2017-09-21T19:00Z	1.01	false
2017-09-21T18:45Z	1.01	false
2017-09-21T18:30Z	1.01	false
2017-09-21T18:15Z	1.01	false
2017-09-21T18:00Z	1.01	false
2017-09-21T17:45Z	1.01	false
2017-09-21T17:30Z	1.01	false
2017-09-21T17:15Z	1	false
2017-09-21T17:00Z	1	false
2017-09-21T16:45Z	1	false
2017-09-21T16:30Z	1	false
2017-09-21T16:15Z	1	false
2017-09-21T16:00Z	1	false
2017-09-21T15:45Z	1	false
2017-09-21T15:30Z	1	false
2017-09-21T15:15Z	1	false
2017-09-21T15:00Z	1	false
2017-09-21T14:45Z	1	false
2017-09-21T14:30Z	1	false
2017-09-21T14:15Z	1	false
2017-09-21T14:00Z	1	false
2017-09-21T13:45Z	1	false
2017-09-21T13:30Z	1	false
2017-09-21T13:15Z	1	false
2017-09-21T13:00Z	1	false
2017-09-21T12:45Z	1	false
2017-09-21T12:30Z	1	false
2017-09-21T12:15Z	1	false
2017-09-21T12:00Z	1	false
2017-09-21T11:45Z	1	false
2017-09-21T11:30Z	1	false
2017-09-21T11:15Z	1	false
2017-09-21T11:00Z	1	false
2017-09-21T10:45Z	1	false
2017-09-21T10:30Z	1	false
2017-09-21T10:15Z	1	false
2017-09-21T10:00Z	1	false
2017-09-21T09:45Z	1	false
2017-09-21T09:30Z	1	false
2017-09-21T09:15Z	1	false
2017-09-21T09:00Z	1	false
2017-09-21T08:45Z	1	false
2017-09-21T08:30Z	1	false
2017-09-21T08:15Z	1	false
2017-09-21T08:00Z	1	false
2017-09-21T07:45Z	1	false
2017-09-21T07:30Z	1	false
2017-09-21T07:15Z	1	false
2017-09-21T07:00Z	1	false
2017-09-21T06:45Z	1	false
2017-09-21T06:30Z	1	false
2017-09-21T06:15Z	1	false
2017-09-21T06:00Z	1	false
2017-09-21T05:45Z	1	false
2017-09-21T05:30Z	1	false
2017-09-21T05:15Z	1	false
2017-09-21T05:00Z	1	false
2017-09-21T04:45Z	1	false
2017-09-21T04:30Z	1	false
2017-09-21T04:15Z	1	false
2017-09-21T04:00Z	1	false
2017-09-21T03:45Z	1	false
2017-09-21T03:30Z	1	false
2017-09-21T03:15Z	1	false
2017-09-21T03:00Z	1	false
2017-09-21T02:45Z	1	false
2017-09-21T02:30Z	1	false
2017-09-21T02:15Z	1	false
2017-09-21T02:00Z	1	false
2017-09-21T01:45Z	1	false
2017-09-21T01:30Z	1	false
2017-09-21T01:15Z	1	false
2017-09-21T01:00Z	1	false
2017-09-21T00:45Z	1	false
2017-09-21T00:30Z	1	false
2017-09-21T00:15Z	1	false
2017-09-21T00:00Z	1	false
2017-09-20T23:45Z	1	false
2017-09-20T23:30Z	1	false
2017-09-20T23:15Z	1.01	false
2017-09-20T23:00Z	1.01	false
2017-09-20T22:45Z	1.01	false
2017-09-20T22:30Z	1.01	false
2017-09-20T22:15Z	1.01	false
2017-09-20T22:00Z	1.01	false
2017-09-20T21:45Z	1.01	false
2017-09-20T21:30Z	1.01	false
2017-09-20T21:15Z	1.01	false
2017-09-20T21:00Z	1.01	false
2017-09-20T20:45Z	1.01	false
2017-09-20T20:30Z	1.01	false
2017-09-20T20:15Z	1.01	false
2017-09-20T20:00Z	1.01	false
2017-09-20T19:45Z	1.01	false
2017-09-20T19:30Z	1.01	false
2017-09-20T19:15Z	1.01	false
2017-09-20T19:00Z	1.01	false
2017-09-20T18:45Z	1.01	false
2017-09-20T18:30Z	1.01	false
2017-09-20T18:15Z	1.01	false
2017-09-20T18:00Z	1.01	false
2017-09-20T17:45Z	1.01	false
2017-09-20T17:30Z	1.01	false
2017-09-20T17:15Z	1.01	false
2017-09-20T17:00Z	1.01	false
2017-09-20T16:45Z	1.01	false
2017-09-20T16:30Z	1	false
2017-09-20T16:15Z	1	false
2017-09-20T16:00Z	1	false
2017-09-20T15:45Z	1	false
2017-09-20T15:30Z	1	false
2017-09-20T15:15Z	1	false
2017-09-20T15:00Z	1	false
2017-09-20T14:45Z	1.01	false
2017-09-20T14:30Z	1.01	false
2017-09-20T14:15Z	1.01	false
2017-09-20T14:00Z	1.01	false
2017-09-20T13:45Z	1.01	false
2017-09-20T13:30Z	1.01	false
2017-09-20T13:15Z	1	false
2017-09-20T13:00Z	1	false
2017-09-20T12:45Z	1	false
2017-09-20T12:30Z	1	false
2017-09-20T12:15Z	1	false
2017-09-20T12:00Z	1	false
2017-09-20T11:45Z	1	false
2017-09-20T11:30Z	1	false
2017-09-20T11:15Z	1	false
2017-09-20T11:00Z	1	false
2017-09-20T10:45Z	1	false
2017-09-20T10:30Z	1	false
2017-09-20T10:15Z	1	false
2017-09-20T10:00Z	1	false
2017-09-20T09:45Z	1	false
2017-09-20T09:30Z	1	false
2017-09-20T09:15Z	1	false
2017-09-20T09:00Z	1	false
2017-09-20T08:45Z	1	false
2017-09-20T08:30Z	1	false
2017-09-20T08:15Z	1	false
2017-09-20T08:00Z	1	false
2017-09-20T07:45Z	1	false
2017-09-20T07:30Z	1	false
2017-09-20T07:15Z	1	false
2017-09-20T07:00Z	1	false
2017-09-20T06:45Z	1	false
2017-09-20T06:30Z	1	false
2017-09-20T06:15Z	1	false
2017-09-20T06:00Z	1	false
2017-09-20T05:45Z	1	false
2017-09-20T05:30Z	1	false
2017-09-20T05:15Z	1	false
2017-09-20T05:00Z	1	false
2017-09-20T04:45Z	1	false
2017-09-20T04:30Z	1	false
2017-09-20T04:15Z	1	false
2017-09-20T04:00Z	1	false
2017-09-20T03:45Z	1	false
2017-09-20T03:30Z	1	false
2017-09-20T03:15Z	1	false
2017-09-20T03:00Z	1	false
2017-09-20T02:45Z	1	false
2017-09-20T02:30Z	1	false
2017-09-20T02:15Z	1	false
2017-09-20T02:00Z	1	false
2017-09-20T01:45Z	1	false
2017-09-20T01:30Z	1	false
2017-09-20T01:15Z	1	false
2017-09-20T01:00Z	1	false
2017-09-20T00:45Z	1	false
2017-09-20T00:30Z	1	false
2017-09-20T00:15Z	1	false
2017-09-20T00:00Z	1	false
2017-09-19T23:45Z	1	false
2017-09-19T23:30Z	1	false
2017-09-19T23:15Z	1	false
2017-09-19T23:00Z	1	false
2017-09-19T22:45Z	1	false
2017-09-19T22:30Z	1	false
2017-09-19T22:15Z	1	false
2017-09-19T22:00Z	1	false
2017-09-19T21:45Z	1	false
2017-09-19T21:30Z	1	false
2017-09-19T21:15Z	1	false
2017-09-19T21:00Z	1	false
2017-09-19T20:45Z	0.99	false
2017-09-19T20:30Z	0.99	false
2017-09-19T20:15Z	0.99	false
2017-09-19T20:00Z	0.99	false
2017-09-19T19:45Z	0.99	false
2017-09-19T19:30Z	0.99	false
2017-09-19T19:15Z	0.99	false
2017-09-19T19:00Z	0.99	false
2017-09-19T18:45Z	0.98	false
2017-09-19T18:30Z	0.98	false
2017-09-19T18:15Z	0.98	false
2017-09-19T18:00Z	0.98	false
2017-09-19T18:00Z	0.98	false
2017-09-19T17:45Z	0.98	false
2017-09-19T17:45Z	0.98	false
2017-09-19T17:30Z	0.98	false
2017-09-19T17:30Z	0.98	false
2017-09-19T17:15Z	0.98	false
2017-09-19T17:15Z	0.98	false
2017-09-19T17:00Z	0.98	false
2017-09-19T17:00Z	0.98	false
2017-09-19T16:45Z	0.98	false
2017-09-19T16:45Z	0.98	false
2017-09-19T16:30Z	0.98	false
2017-09-19T16:30Z	0.98	false
2017-09-19T16:15Z	0.98	false
2017-09-19T16:15Z	0.98	false
2017-09-19T16:00Z	0.98	false
2017-09-19T16:00Z	0.98	false
2017-09-19T15:45Z	0.98	false
2017-09-19T15:45Z	0.98	false
2017-09-19T15:30Z	0.98	false
2017-09-19T15:30Z	0.98	false
2017-09-19T15:15Z	0.98	false
2017-09-19T15:15Z	0.98	false
2017-09-19T15:00Z	0.98	false
2017-09-19T15:00Z	0.98	false
2017-09-19T14:45Z	0.98	false
2017-09-19T14:45Z	0.98	false
2017-09-19T14:30Z	0.98	false
2017-09-19T14:30Z	0.98	false
2017-09-19T14:15Z	0.98	false
2017-09-19T14:15Z	0.98	false
2017-09-19T14:00Z	0.98	false
2017-09-19T14:00Z	0.98	false
2017-09-19T13:45Z	0.98	false
2017-09-19T13:45Z	0.98	false
2017-09-19T13:30Z	0.98	false
2017-09-19T13:30Z	0.98	false
2017-09-19T13:15Z	0.98	false
2017-09-19T13:15Z	0.98	false
2017-09-19T13:00Z	0.98	false
2017-09-19T13:00Z	0.98	false
2017-09-19T12:45Z	0.98	false
2017-09-19T12:45Z	0.98	false
2017-09-19T12:30Z	0.98	false
2017-09-19T12:30Z	0.98	false
2017-09-19T12:15Z	0.98	false
2017-09-19T12:15Z	0.98	false
2017-09-19T12:00Z	0.98	false
2017-09-19T11:45Z	0.98	false
2017-09-19T11:30Z	0.98	false
2017-09-19T11:15Z	0.98	false
2017-09-19T11:00Z	0.98	false
2017-09-19T10:45Z	0.98	false
2017-09-19T10:30Z	0.99	false
2017-09-19T10:15Z	0.99	false
2017-09-19T10:00Z	0.99	false
2017-09-19T09:45Z	0.99	false
2017-09-19T09:30Z	0.99	false
2017-09-19T09:15Z	0.99	false
2017-09-19T09:00Z	0.99	false
2017-09-19T08:45Z	1	false
2017-09-19T08:30Z	0.99	false
2017-09-19T08:15Z	1	false
2017-09-19T08:00Z	1	false
2017-09-19T07:45Z	0.99	false
2017-09-19T07:30Z	0.99	false
2017-09-19T07:15Z	1	false
2017-09-19T07:00Z	1	false
2017-09-19T06:45Z	1	false
2017-09-19T06:30Z	1	false
2017-09-19T06:15Z	1	false
2017-09-19T06:00Z	1	false
2017-09-19T05:45Z	1	false
2017-09-19T05:30Z	1	false
2017-09-19T05:15Z	1	false
2017-09-19T05:00Z	1	false
2017-09-19T04:45Z	1	false
2017-09-19T04:30Z	1	false
2017-09-19T04:15Z	1	false
2017-09-19T04:00Z	1	false
2017-09-19T03:45Z	1	false
2017-09-19T03:30Z	1	false
2017-09-19T03:15Z	1	false
2017-09-19T03:00Z	1	false
2017-09-19T02:45Z	1	false
2017-09-19T02:30Z	1	false
2017-09-19T02:15Z	1	false
2017-09-19T02:00Z	1	false
2017-09-19T01:45Z	1	false
2017-09-19T01:30Z	1	false
2017-09-19T01:15Z	1	false
2017-09-19T01:00Z	1	false
2017-09-19T00:45Z	1	false
2017-09-19T00:30Z	1	false
2017-09-19T00:15Z	1	false
2017-09-19T00:00Z	1	false
2017-09-19T00:00Z	1	false
2017-09-18T23:45Z	1	false
2017-09-18T23:45Z	1	false
2017-09-18T23:30Z	1	false
2017-09-18T23:30Z	1	false
2017-09-18T23:15Z	1	false
2017-09-18T23:15Z	1	false
2017-09-18T23:00Z	1	false
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2017-09-18T22:15Z	1	false
2017-09-18T22:00Z	1	false
2017-09-18T22:00Z	1	false
2017-09-18T21:45Z	1	false
2017-09-18T21:45Z	1	false
2017-09-18T21:30Z	1	false
2017-09-18T21:30Z	1	false
2017-09-18T21:15Z	1	false
2017-09-18T21:15Z	1	false
2017-09-18T21:00Z	1	false
2017-09-18T21:00Z	1	false
2017-09-18T20:45Z	1	false
2017-09-18T20:45Z	1	false
2017-09-18T20:30Z	1	false
2017-09-18T20:30Z	1	false
2017-09-18T20:15Z	1	false
2017-09-18T20:15Z	1	false
2017-09-18T20:00Z	1	false
2017-09-18T20:00Z	1	false
2017-09-18T19:45Z	1	false
2017-09-18T19:45Z	1	false
2017-09-18T19:30Z	1	false
2017-09-18T19:30Z	1	false
2017-09-18T19:15Z	1	false
2017-09-18T19:15Z	1	false
2017-09-18T19:00Z	1	false
2017-09-18T19:00Z	1	false
2017-09-18T18:45Z	1	false
2017-09-18T18:45Z	1	false
2017-09-18T18:30Z	1	false
2017-09-18T18:30Z	1	false
2017-09-18T18:15Z	1	false
2017-09-18T18:15Z	1	false
2017-09-18T18:00Z	1	false
2017-09-18T17:45Z	1	false
2017-09-18T17:30Z	0.99	false
2017-09-18T17:15Z	0.99	false
2017-09-18T17:00Z	0.99	false
2017-09-18T16:45Z	0.99	false
2017-09-18T16:30Z	0.99	false
2017-09-18T16:15Z	0.99	false
2017-09-18T16:00Z	0.99	false
2017-09-18T15:45Z	0.99	false
2017-09-18T15:30Z	0.99	false
2017-09-18T15:15Z	0.99	false
2017-09-18T15:00Z	0.99	false
2017-09-18T14:45Z	0.99	false
2017-09-18T14:30Z	0.99	false
2017-09-18T14:15Z	0.99	false
2017-09-18T14:00Z	0.99	false
2017-09-18T13:45Z	0.99	false
2017-09-18T13:30Z	0.99	false
2017-09-18T13:15Z	0.99	false
2017-09-18T13:00Z	0.99	false
2017-09-18T12:45Z	0.99	false
2017-09-18T12:30Z	0.99	false
2017-09-18T12:15Z	0.99	false
2017-09-18T12:00Z	0.99	false
2017-09-18T11:45Z	1	false
2017-09-18T11:30Z	1	false
2017-09-18T11:15Z	1	false
2017-09-18T11:00Z	1	false
2017-09-18T10:45Z	1	false
2017-09-18T10:30Z	1	false
2017-09-18T10:15Z	1	false
2017-09-18T10:00Z	1	false
2017-09-18T09:45Z	1	false
2017-09-18T09:30Z	1	false
2017-09-18T09:15Z	1	false
2017-09-18T09:00Z	1	false
2017-09-18T08:45Z	1.01	false
2017-09-18T08:30Z	1.01	false
2017-09-18T08:15Z	1.01	false
2017-09-18T08:00Z	1.01	false
2017-09-18T07:45Z	1.01	false
2017-09-18T07:30Z	1.01	false
2017-09-18T07:15Z	1.01	false
2017-09-18T07:00Z	1.01	false
2017-09-18T06:45Z	1.01	false
2017-09-18T06:30Z	1.01	false
2017-09-18T06:15Z	1.01	false
2017-09-18T06:00Z	1.01	false
2017-09-18T05:45Z	1.01	false
2017-09-18T05:30Z	1.01	false
2017-09-18T05:15Z	1.01	false
2017-09-18T05:00Z	1.01	false
2017-09-18T04:45Z	1.01	false
2017-09-18T04:30Z	1.01	false
2017-09-18T04:15Z	1.01	false
2017-09-18T04:00Z	1.01	false
2017-09-18T03:45Z	1.01	false
2017-09-18T03:30Z	1.01	false
2017-09-18T03:15Z	1.01	false
2017-09-18T03:00Z	1.01	false
2017-09-18T02:45Z	1.01	false
2017-09-18T02:30Z	1.01	false
2017-09-18T02:15Z	1.01	false
2017-09-18T02:00Z	1.01	false
2017-09-18T01:45Z	1.01	false
2017-09-18T01:30Z	1.01	false
2017-09-18T01:15Z	1.01	false
2017-09-18T01:00Z	1.01	false
2017-09-18T00:45Z	1.01	false
2017-09-18T00:30Z	1.01	false
2017-09-18T00:15Z	1.01	false
2017-09-18T00:00Z	1.01	false
2017-09-17T23:45Z	1.01	false
2017-09-17T23:30Z	1.01	false
2017-09-17T23:15Z	1.01	false
2017-09-17T23:00Z	1.01	false
2017-09-17T22:45Z	1.01	false
2017-09-17T22:30Z	1.01	false
2017-09-17T22:15Z	1.01	false
2017-09-17T22:00Z	1.01	false
2017-09-17T21:45Z	1.01	false
2017-09-17T21:30Z	1.01	false
2017-09-17T21:15Z	1.01	false
2017-09-17T21:00Z	1.01	false
2017-09-17T20:45Z	1.01	false
2017-09-17T20:30Z	1.01	false
2017-09-17T20:15Z	1.01	false
2017-09-17T20:00Z	1.01	false
2017-09-17T19:45Z	1.01	false
2017-09-17T19:30Z	1.01	false
2017-09-17T19:15Z	1.01	false
2017-09-17T19:00Z	1.01	false
2017-09-17T18:45Z	1.01	false
2017-09-17T18:30Z	1.01	false
2017-09-17T18:15Z	1.01	false

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 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.

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