River level River Colne at London Colney

Check for flood warnings in this area

Latest recorded level 0.74m at 7:00pm Thursday 20 September 2018.

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
• Show highest recorded level

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Observed data

DateTime	Value	Error
2018-09-20T18:00Z	0.736	false
2018-09-20T17:45Z	0.737	false
2018-09-20T17:30Z	0.738	false
2018-09-20T17:15Z	0.739	false
2018-09-20T17:00Z	0.738	false
2018-09-20T16:45Z	0.737	false
2018-09-20T16:30Z	0.738	false
2018-09-20T16:15Z	0.739	false
2018-09-20T16:00Z	0.738	false
2018-09-20T15:45Z	0.739	false
2018-09-20T15:30Z	0.739	false
2018-09-20T15:15Z	0.736	false
2018-09-20T15:00Z	0.737	false
2018-09-20T14:45Z	0.737	false
2018-09-20T14:30Z	0.738	false
2018-09-20T14:15Z	0.74	false
2018-09-20T14:00Z	0.741	false
2018-09-20T13:45Z	0.742	false
2018-09-20T13:30Z	0.741	false
2018-09-20T13:15Z	0.742	false
2018-09-20T13:00Z	0.744	false
2018-09-20T12:45Z	0.743	false
2018-09-20T12:30Z	0.745	false
2018-09-20T12:15Z	0.745	false
2018-09-20T12:00Z	0.746	false
2018-09-20T11:45Z	0.747	false
2018-09-20T11:30Z	0.749	false
2018-09-20T11:15Z	0.751	false
2018-09-20T11:00Z	0.752	false
2018-09-20T10:45Z	0.752	false
2018-09-20T10:30Z	0.756	false
2018-09-20T10:15Z	0.756	false
2018-09-20T10:00Z	0.757	false
2018-09-20T09:45Z	0.757	false
2018-09-20T09:30Z	0.757	false
2018-09-20T09:15Z	0.756	false
2018-09-20T09:00Z	0.756	false
2018-09-20T08:45Z	0.757	false
2018-09-20T08:30Z	0.757	false
2018-09-20T08:15Z	0.757	false
2018-09-20T08:00Z	0.756	false
2018-09-20T07:45Z	0.756	false
2018-09-20T07:30Z	0.754	false
2018-09-20T07:15Z	0.754	false
2018-09-20T07:00Z	0.755	false
2018-09-20T06:45Z	0.755	false
2018-09-20T06:30Z	0.754	false
2018-09-20T06:15Z	0.752	false
2018-09-20T06:00Z	0.753	false
2018-09-20T05:45Z	0.753	false
2018-09-20T05:30Z	0.754	false
2018-09-20T05:15Z	0.754	false
2018-09-20T05:00Z	0.754	false
2018-09-20T04:45Z	0.753	false
2018-09-20T04:30Z	0.751	false
2018-09-20T04:15Z	0.752	false
2018-09-20T04:00Z	0.752	false
2018-09-20T03:45Z	0.752	false
2018-09-20T03:30Z	0.752	false
2018-09-20T03:15Z	0.754	false
2018-09-20T03:00Z	0.753	false
2018-09-20T02:45Z	0.754	false
2018-09-20T02:30Z	0.755	false
2018-09-20T02:15Z	0.756	false
2018-09-20T02:00Z	0.756	false
2018-09-20T01:45Z	0.757	false
2018-09-20T01:30Z	0.758	false
2018-09-20T01:15Z	0.761	false
2018-09-20T01:00Z	0.761	false
2018-09-20T00:45Z	0.761	false
2018-09-20T00:30Z	0.76	false
2018-09-20T00:15Z	0.761	false
2018-09-20T00:00Z	0.761	false
2018-09-19T23:45Z	0.762	false
2018-09-19T23:30Z	0.765	false
2018-09-19T23:15Z	0.763	false
2018-09-19T23:00Z	0.762	false
2018-09-19T22:45Z	0.763	false
2018-09-19T22:30Z	0.765	false
2018-09-19T22:15Z	0.766	false
2018-09-19T22:00Z	0.766	false
2018-09-19T21:45Z	0.766	false
2018-09-19T21:30Z	0.765	false
2018-09-19T21:15Z	0.766	false
2018-09-19T21:00Z	0.766	false
2018-09-19T20:45Z	0.766	false
2018-09-19T20:30Z	0.766	false
2018-09-19T20:15Z	0.766	false
2018-09-19T20:00Z	0.765	false
2018-09-19T19:45Z	0.765	false
2018-09-19T19:30Z	0.764	false
2018-09-19T19:15Z	0.764	false
2018-09-19T19:00Z	0.764	false
2018-09-19T18:45Z	0.764	false
2018-09-19T18:30Z	0.763	false
2018-09-19T18:15Z	0.763	false
2018-09-19T18:00Z	0.762	false
2018-09-19T17:45Z	0.762	false
2018-09-19T17:30Z	0.762	false
2018-09-19T17:15Z	0.762	false
2018-09-19T17:00Z	0.762	false
2018-09-19T16:45Z	0.761	false
2018-09-19T16:30Z	0.761	false
2018-09-19T16:15Z	0.761	false
2018-09-19T16:00Z	0.761	false
2018-09-19T15:45Z	0.76	false
2018-09-19T15:30Z	0.761	false
2018-09-19T15:15Z	0.76	false
2018-09-19T15:00Z	0.761	false
2018-09-19T14:45Z	0.76	false
2018-09-19T14:30Z	0.759	false
2018-09-19T14:15Z	0.759	false
2018-09-19T14:00Z	0.76	false
2018-09-19T13:45Z	0.76	false
2018-09-19T13:30Z	0.761	false
2018-09-19T13:15Z	0.76	false
2018-09-19T13:00Z	0.76	false
2018-09-19T12:45Z	0.761	false
2018-09-19T12:30Z	0.76	false
2018-09-19T12:15Z	0.76	false
2018-09-19T12:00Z	0.76	false
2018-09-19T11:45Z	0.759	false
2018-09-19T11:30Z	0.76	false
2018-09-19T11:15Z	0.761	false
2018-09-19T11:00Z	0.759	false
2018-09-19T10:45Z	0.76	false
2018-09-19T10:30Z	0.763	false
2018-09-19T10:15Z	0.763	false
2018-09-19T10:00Z	0.766	false
2018-09-19T09:45Z	0.767	false
2018-09-19T09:30Z	0.766	false
2018-09-19T09:15Z	0.767	false
2018-09-19T09:00Z	0.768	false
2018-09-19T08:45Z	0.767	false
2018-09-19T08:30Z	0.768	false
2018-09-19T08:15Z	0.768	false
2018-09-19T08:00Z	0.769	false
2018-09-19T07:45Z	0.769	false
2018-09-19T07:30Z	0.769	false
2018-09-19T07:15Z	0.767	false
2018-09-19T07:00Z	0.768	false
2018-09-19T06:45Z	0.77	false
2018-09-19T06:30Z	0.772	false
2018-09-19T06:15Z	0.773	false
2018-09-19T06:00Z	0.771	false
2018-09-19T05:45Z	0.771	false
2018-09-19T05:30Z	0.772	false
2018-09-19T05:15Z	0.771	false
2018-09-19T05:00Z	0.77	false
2018-09-19T04:45Z	0.769	false
2018-09-19T04:30Z	0.77	false
2018-09-19T04:15Z	0.771	false
2018-09-19T04:00Z	0.767	false
2018-09-19T03:45Z	0.767	false
2018-09-19T03:30Z	0.768	false
2018-09-19T03:15Z	0.768	false
2018-09-19T03:00Z	0.767	false
2018-09-19T02:45Z	0.766	false
2018-09-19T02:30Z	0.767	false
2018-09-19T02:15Z	0.767	false
2018-09-19T02:00Z	0.769	false
2018-09-19T01:45Z	0.769	false
2018-09-19T01:30Z	0.767	false
2018-09-19T01:15Z	0.768	false
2018-09-19T01:00Z	0.768	false
2018-09-19T00:45Z	0.769	false
2018-09-19T00:30Z	0.77	false
2018-09-19T00:15Z	0.768	false
2018-09-19T00:00Z	0.772	false
2018-09-18T23:45Z	0.771	false
2018-09-18T23:30Z	0.769	false
2018-09-18T23:15Z	0.771	false
2018-09-18T23:00Z	0.772	false
2018-09-18T22:45Z	0.772	false
2018-09-18T22:30Z	0.771	false
2018-09-18T22:15Z	0.771	false
2018-09-18T22:00Z	0.772	false
2018-09-18T21:45Z	0.772	false
2018-09-18T21:30Z	0.773	false
2018-09-18T21:15Z	0.773	false
2018-09-18T21:00Z	0.773	false
2018-09-18T20:45Z	0.773	false
2018-09-18T20:30Z	0.772	false
2018-09-18T20:15Z	0.772	false
2018-09-18T20:00Z	0.773	false
2018-09-18T19:45Z	0.771	false
2018-09-18T19:30Z	0.771	false
2018-09-18T19:15Z	0.773	false
2018-09-18T19:00Z	0.773	false
2018-09-18T18:45Z	0.771	false
2018-09-18T18:30Z	0.772	false
2018-09-18T18:15Z	0.772	false
2018-09-18T18:00Z	0.772	false
2018-09-18T17:45Z	0.771	false
2018-09-18T17:30Z	0.771	false
2018-09-18T17:15Z	0.77	false
2018-09-18T17:00Z	0.771	false
2018-09-18T16:45Z	0.77	false
2018-09-18T16:30Z	0.771	false
2018-09-18T16:15Z	0.77	false
2018-09-18T16:00Z	0.77	false
2018-09-18T15:45Z	0.77	false
2018-09-18T15:30Z	0.77	false
2018-09-18T15:15Z	0.769	false
2018-09-18T15:00Z	0.77	false
2018-09-18T14:45Z	0.77	false
2018-09-18T14:30Z	0.769	false
2018-09-18T14:15Z	0.769	false
2018-09-18T14:00Z	0.77	false
2018-09-18T13:45Z	0.77	false
2018-09-18T13:30Z	0.77	false
2018-09-18T13:15Z	0.771	false
2018-09-18T13:00Z	0.771	false
2018-09-18T12:45Z	0.77	false
2018-09-18T12:30Z	0.77	false
2018-09-18T12:15Z	0.77	false
2018-09-18T12:00Z	0.771	false
2018-09-18T11:45Z	0.77	false
2018-09-18T11:30Z	0.771	false
2018-09-18T11:15Z	0.771	false
2018-09-18T11:00Z	0.771	false
2018-09-18T10:45Z	0.771	false
2018-09-18T10:30Z	0.771	false
2018-09-18T10:15Z	0.771	false
2018-09-18T10:00Z	0.771	false
2018-09-18T09:45Z	0.771	false
2018-09-18T09:30Z	0.77	false
2018-09-18T09:15Z	0.771	false
2018-09-18T09:00Z	0.77	false
2018-09-18T08:45Z	0.768	false
2018-09-18T08:30Z	0.768	false
2018-09-18T08:15Z	0.767	false
2018-09-18T08:00Z	0.769	false
2018-09-18T07:45Z	0.768	false
2018-09-18T07:30Z	0.766	false
2018-09-18T07:15Z	0.767	false
2018-09-18T07:00Z	0.766	false
2018-09-18T06:45Z	0.766	false
2018-09-18T06:30Z	0.762	false
2018-09-18T06:15Z	0.762	false
2018-09-18T06:00Z	0.761	false
2018-09-18T05:45Z	0.758	false
2018-09-18T05:30Z	0.758	false
2018-09-18T05:15Z	0.757	false
2018-09-18T05:00Z	0.756	false
2018-09-18T04:45Z	0.753	false
2018-09-18T04:30Z	0.751	false
2018-09-18T04:15Z	0.751	false
2018-09-18T04:00Z	0.751	false
2018-09-18T03:45Z	0.751	false
2018-09-18T03:30Z	0.751	false
2018-09-18T03:15Z	0.751	false
2018-09-18T03:00Z	0.751	false
2018-09-18T02:45Z	0.752	false
2018-09-18T02:30Z	0.752	false
2018-09-18T02:15Z	0.754	false
2018-09-18T02:00Z	0.756	false
2018-09-18T01:45Z	0.755	false
2018-09-18T01:30Z	0.754	false
2018-09-18T01:15Z	0.754	false
2018-09-18T01:00Z	0.754	false
2018-09-18T00:45Z	0.753	false
2018-09-18T00:30Z	0.752	false
2018-09-18T00:15Z	0.753	false
2018-09-18T00:00Z	0.754	false
2018-09-17T23:45Z	0.753	false
2018-09-17T23:30Z	0.753	false
2018-09-17T23:15Z	0.753	false
2018-09-17T23:00Z	0.753	false
2018-09-17T22:45Z	0.754	false
2018-09-17T22:30Z	0.754	false
2018-09-17T22:15Z	0.754	false
2018-09-17T22:00Z	0.754	false
2018-09-17T21:45Z	0.754	false
2018-09-17T21:30Z	0.754	false
2018-09-17T21:15Z	0.754	false
2018-09-17T21:00Z	0.755	false
2018-09-17T20:45Z	0.755	false
2018-09-17T20:30Z	0.756	false
2018-09-17T20:15Z	0.755	false
2018-09-17T20:00Z	0.756	false
2018-09-17T19:45Z	0.756	false
2018-09-17T19:30Z	0.756	false
2018-09-17T19:15Z	0.757	false
2018-09-17T19:00Z	0.757	false
2018-09-17T18:45Z	0.757	false
2018-09-17T18:30Z	0.758	false
2018-09-17T18:15Z	0.758	false
2018-09-17T18:00Z	0.757	false
2018-09-17T17:45Z	0.757	false
2018-09-17T17:30Z	0.757	false
2018-09-17T17:15Z	0.757	false
2018-09-17T17:00Z	0.757	false
2018-09-17T16:45Z	0.757	false
2018-09-17T16:30Z	0.756	false
2018-09-17T16:15Z	0.755	false
2018-09-17T16:00Z	0.756	false
2018-09-17T15:45Z	0.756	false
2018-09-17T15:30Z	0.757	false
2018-09-17T15:15Z	0.756	false
2018-09-17T15:00Z	0.757	false
2018-09-17T14:45Z	0.757	false
2018-09-17T14:30Z	0.757	false
2018-09-17T14:15Z	0.757	false
2018-09-17T14:00Z	0.758	false
2018-09-17T13:45Z	0.758	false
2018-09-17T13:30Z	0.759	false
2018-09-17T13:15Z	0.761	false
2018-09-17T13:00Z	0.762	false
2018-09-17T12:45Z	0.762	false
2018-09-17T12:30Z	0.763	false
2018-09-17T12:15Z	0.764	false
2018-09-17T12:00Z	0.764	false
2018-09-17T11:45Z	0.765	false
2018-09-17T11:30Z	0.738	false
2018-09-17T11:15Z	5.61	false
2018-09-17T11:00Z	0.732	false
2018-09-17T10:45Z	0.735	false
2018-09-17T10:30Z	0.739	false
2018-09-17T10:15Z	0.739	false
2018-09-17T10:00Z	0.739	false
2018-09-17T09:45Z	0.74	false
2018-09-17T09:30Z	0.74	false
2018-09-17T09:15Z	0.741	false
2018-09-17T09:00Z	0.742	false
2018-09-17T08:45Z	0.742	false
2018-09-17T08:30Z	0.742	false
2018-09-17T08:15Z	0.742	false
2018-09-17T08:00Z	0.743	false
2018-09-17T07:45Z	0.743	false
2018-09-17T07:30Z	0.742	false
2018-09-17T07:15Z	0.743	false
2018-09-17T07:00Z	0.743	false
2018-09-17T06:45Z	0.744	false
2018-09-17T06:30Z	0.744	false
2018-09-17T06:15Z	0.744	false
2018-09-17T06:00Z	0.744	false
2018-09-17T05:45Z	0.744	false
2018-09-17T05:30Z	0.743	false
2018-09-17T05:15Z	0.743	false
2018-09-17T05:00Z	0.743	false
2018-09-17T04:45Z	0.743	false
2018-09-17T04:30Z	0.742	false
2018-09-17T04:15Z	0.743	false
2018-09-17T04:00Z	0.744	false
2018-09-17T03:45Z	0.743	false
2018-09-17T03:30Z	0.744	false
2018-09-17T03:15Z	0.744	false
2018-09-17T03:00Z	0.744	false
2018-09-17T02:45Z	0.744	false
2018-09-17T02:30Z	0.745	false
2018-09-17T02:15Z	0.744	false
2018-09-17T02:00Z	0.745	false
2018-09-17T01:45Z	0.745	false
2018-09-17T01:30Z	0.745	false
2018-09-17T01:15Z	0.744	false
2018-09-17T01:00Z	0.745	false
2018-09-17T00:45Z	0.745	false
2018-09-17T00:30Z	0.746	false
2018-09-17T00:15Z	0.746	false
2018-09-17T00:00Z	0.746	false
2018-09-16T23:45Z	0.746	false
2018-09-16T23:30Z	0.746	false
2018-09-16T23:15Z	0.747	false
2018-09-16T23:00Z	0.747	false
2018-09-16T22:45Z	0.747	false
2018-09-16T22:30Z	0.747	false
2018-09-16T22:15Z	0.746	false
2018-09-16T22:00Z	0.746	false
2018-09-16T21:45Z	0.747	false
2018-09-16T21:30Z	0.747	false
2018-09-16T21:15Z	0.747	false
2018-09-16T21:00Z	0.747	false
2018-09-16T20:45Z	0.747	false
2018-09-16T20:30Z	0.747	false
2018-09-16T20:15Z	0.747	false
2018-09-16T20:00Z	0.746	false
2018-09-16T19:45Z	0.746	false
2018-09-16T19:30Z	0.745	false
2018-09-16T19:15Z	0.745	false
2018-09-16T19:00Z	0.744	false
2018-09-16T18:45Z	0.744	false
2018-09-16T18:30Z	0.744	false
2018-09-16T18:15Z	0.743	false
2018-09-16T18:00Z	0.743	false
2018-09-16T17:45Z	0.742	false
2018-09-16T17:30Z	0.742	false
2018-09-16T17:15Z	0.741	false
2018-09-16T17:00Z	0.74	false
2018-09-16T16:45Z	0.74	false
2018-09-16T16:30Z	0.74	false
2018-09-16T16:15Z	0.74	false
2018-09-16T16:00Z	0.74	false
2018-09-16T15:45Z	0.739	false
2018-09-16T15:30Z	0.74	false
2018-09-16T15:15Z	0.739	false
2018-09-16T15:00Z	0.74	false
2018-09-16T14:45Z	0.74	false
2018-09-16T14:30Z	0.74	false
2018-09-16T14:15Z	0.741	false
2018-09-16T14:00Z	0.741	false
2018-09-16T13:45Z	0.741	false
2018-09-16T13:30Z	0.741	false
2018-09-16T13:15Z	0.74	false
2018-09-16T13:00Z	0.741	false
2018-09-16T12:45Z	0.742	false
2018-09-16T12:30Z	0.743	false
2018-09-16T12:15Z	0.745	false
2018-09-16T12:00Z	0.747	false
2018-09-16T11:45Z	0.748	false
2018-09-16T11:30Z	0.748	false
2018-09-16T11:15Z	0.748	false
2018-09-16T11:00Z	0.747	false
2018-09-16T10:45Z	0.749	false
2018-09-16T10:30Z	0.75	false
2018-09-16T10:15Z	0.751	false
2018-09-16T10:00Z	0.75	false
2018-09-16T09:45Z	0.751	false
2018-09-16T09:30Z	0.751	false
2018-09-16T09:15Z	0.752	false
2018-09-16T09:00Z	0.752	false
2018-09-16T08:45Z	0.753	false
2018-09-16T08:30Z	0.753	false
2018-09-16T08:15Z	0.754	false
2018-09-16T08:00Z	0.754	false
2018-09-16T07:45Z	0.753	false
2018-09-16T07:30Z	0.754	false
2018-09-16T07:15Z	0.754	false
2018-09-16T07:00Z	0.755	false
2018-09-16T06:45Z	0.756	false
2018-09-16T06:30Z	0.756	false
2018-09-16T06:15Z	0.756	false
2018-09-16T06:00Z	0.757	false
2018-09-16T05:45Z	0.757	false
2018-09-16T05:30Z	0.756	false
2018-09-16T05:15Z	0.756	false
2018-09-16T05:00Z	0.755	false
2018-09-16T04:45Z	0.755	false
2018-09-16T04:30Z	0.755	false
2018-09-16T04:15Z	0.755	false
2018-09-16T04:00Z	0.756	false
2018-09-16T03:45Z	0.757	false
2018-09-16T03:30Z	0.758	false
2018-09-16T03:15Z	0.758	false
2018-09-16T03:00Z	0.758	false
2018-09-16T02:45Z	0.758	false
2018-09-16T02:30Z	0.758	false
2018-09-16T02:15Z	0.759	false
2018-09-16T02:00Z	0.759	false
2018-09-16T01:45Z	0.76	false
2018-09-16T01:30Z	0.759	false
2018-09-16T01:15Z	0.76	false
2018-09-16T01:00Z	0.761	false
2018-09-16T00:45Z	0.761	false
2018-09-16T00:30Z	0.762	false
2018-09-16T00:15Z	0.762	false
2018-09-16T00:00Z	0.762	false
2018-09-15T23:45Z	0.763	false
2018-09-15T23:30Z	0.763	false
2018-09-15T23:15Z	0.763	false
2018-09-15T23:00Z	0.763	false
2018-09-15T22:45Z	0.763	false
2018-09-15T22:30Z	0.763	false
2018-09-15T22:15Z	0.763	false
2018-09-15T22:00Z	0.763	false
2018-09-15T21:45Z	0.764	false
2018-09-15T21:30Z	0.764	false
2018-09-15T21:15Z	0.764	false
2018-09-15T21:00Z	0.765	false
2018-09-15T20:45Z	0.765	false
2018-09-15T20:30Z	0.765	false
2018-09-15T20:15Z	0.765	false
2018-09-15T20:00Z	0.765	false
2018-09-15T19:45Z	0.764	false
2018-09-15T19:30Z	0.765	false
2018-09-15T19:15Z	0.764	false
2018-09-15T19:00Z	0.763	false
2018-09-15T18:45Z	0.764	false
2018-09-15T18:30Z	0.763	false
2018-09-15T18:15Z	0.763	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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