River level River Lee at Harpenden

Check for flood warnings in this area

Latest recorded level 0.70m at 5:30am Tuesday 23 July 2019.

River levels at this location in the last 5 days

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• Measured level
• When the water level reaches 1.12m here, minor flooding is possible in this area
• Highest recorded level. Hide
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Observed data

DateTime	Value	Error
2019-07-23T04:30Z	0.699	false
2019-07-23T04:15Z	0.704	false
2019-07-23T04:00Z	0.707	false
2019-07-23T03:45Z	0.709	false
2019-07-23T03:30Z	0.713	false
2019-07-23T03:15Z	0.716	false
2019-07-23T03:00Z	0.718	false
2019-07-23T02:45Z	0.721	false
2019-07-23T02:30Z	0.724	false
2019-07-23T02:15Z	0.725	false
2019-07-23T02:00Z	0.726	false
2019-07-23T01:45Z	0.728	false
2019-07-23T01:30Z	0.729	false
2019-07-23T01:15Z	0.729	false
2019-07-23T01:00Z	0.731	false
2019-07-23T00:45Z	0.732	false
2019-07-23T00:30Z	0.732	false
2019-07-23T00:15Z	0.734	false
2019-07-23T00:00Z	0.734	false
2019-07-22T23:45Z	0.734	false
2019-07-22T23:30Z	0.733	false
2019-07-22T23:15Z	0.733	false
2019-07-22T23:00Z	0.733	false
2019-07-22T22:45Z	0.733	false
2019-07-22T22:30Z	0.733	false
2019-07-22T22:15Z	0.731	false
2019-07-22T22:00Z	0.73	false
2019-07-22T21:45Z	0.73	false
2019-07-22T21:30Z	0.73	false
2019-07-22T21:15Z	0.729	false
2019-07-22T21:00Z	0.729	false
2019-07-22T20:45Z	0.73	false
2019-07-22T20:30Z	0.729	false
2019-07-22T20:15Z	0.729	false
2019-07-22T20:00Z	0.728	false
2019-07-22T19:45Z	0.729	false
2019-07-22T19:30Z	0.728	false
2019-07-22T19:15Z	0.729	false
2019-07-22T19:00Z	0.728	false
2019-07-22T18:45Z	0.729	false
2019-07-22T18:30Z	0.729	false
2019-07-22T18:15Z	0.729	false
2019-07-22T18:00Z	0.731	false
2019-07-22T17:45Z	0.73	false
2019-07-22T17:30Z	0.731	false
2019-07-22T17:15Z	0.732	false
2019-07-22T17:00Z	0.733	false
2019-07-22T16:45Z	0.733	false
2019-07-22T16:30Z	0.735	false
2019-07-22T16:15Z	0.734	false
2019-07-22T16:00Z	0.734	false
2019-07-22T15:45Z	0.734	false
2019-07-22T15:30Z	0.735	false
2019-07-22T15:15Z	0.735	false
2019-07-22T15:00Z	0.734	false
2019-07-22T14:45Z	0.734	false
2019-07-22T14:30Z	0.734	false
2019-07-22T14:15Z	0.733	false
2019-07-22T14:00Z	0.732	false
2019-07-22T13:45Z	0.732	false
2019-07-22T13:30Z	0.73	false
2019-07-22T13:15Z	0.729	false
2019-07-22T13:00Z	0.728	false
2019-07-22T12:45Z	0.725	false
2019-07-22T12:30Z	0.724	false
2019-07-22T12:15Z	0.721	false
2019-07-22T12:00Z	0.717	false
2019-07-22T11:45Z	0.713	false
2019-07-22T11:30Z	0.708	false
2019-07-22T11:15Z	0.701	false
2019-07-22T11:00Z	0.694	false
2019-07-22T10:45Z	0.688	false
2019-07-22T10:30Z	0.681	false
2019-07-22T10:15Z	0.675	false
2019-07-22T10:00Z	0.671	false
2019-07-22T09:45Z	0.667	false
2019-07-22T09:30Z	0.665	false
2019-07-22T09:15Z	0.663	false
2019-07-22T09:00Z	0.663	false
2019-07-22T08:45Z	0.663	false
2019-07-22T08:30Z	0.664	false
2019-07-22T08:15Z	0.664	false
2019-07-22T08:00Z	0.665	false
2019-07-22T07:45Z	0.667	false
2019-07-22T07:30Z	0.669	false
2019-07-22T07:15Z	0.671	false
2019-07-22T07:00Z	0.672	false
2019-07-22T06:45Z	0.674	false
2019-07-22T06:30Z	0.678	false
2019-07-22T06:15Z	0.68	false
2019-07-22T06:00Z	0.683	false
2019-07-22T05:45Z	0.687	false
2019-07-22T05:30Z	0.69	false
2019-07-22T05:15Z	0.693	false
2019-07-22T05:00Z	0.695	false
2019-07-22T04:45Z	0.699	false
2019-07-22T04:30Z	0.701	false
2019-07-22T04:15Z	0.705	false
2019-07-22T04:00Z	0.707	false
2019-07-22T03:45Z	0.712	false
2019-07-22T03:30Z	0.714	false
2019-07-22T03:15Z	0.715	false
2019-07-22T03:00Z	0.718	false
2019-07-22T02:45Z	0.72	false
2019-07-22T02:30Z	0.724	false
2019-07-22T02:15Z	0.726	false
2019-07-22T02:00Z	0.727	false
2019-07-22T01:45Z	0.728	false
2019-07-22T01:30Z	0.73	false
2019-07-22T01:15Z	0.731	false
2019-07-22T01:00Z	0.732	false
2019-07-22T00:45Z	0.733	false
2019-07-22T00:30Z	0.733	false
2019-07-22T00:15Z	0.734	false
2019-07-22T00:00Z	0.733	false
2019-07-21T23:45Z	0.734	false
2019-07-21T23:30Z	0.734	false
2019-07-21T23:15Z	0.734	false
2019-07-21T23:00Z	0.733	false
2019-07-21T22:45Z	0.733	false
2019-07-21T22:30Z	0.733	false
2019-07-21T22:15Z	0.733	false
2019-07-21T22:00Z	0.731	false
2019-07-21T21:45Z	0.731	false
2019-07-21T21:30Z	0.731	false
2019-07-21T21:15Z	0.732	false
2019-07-21T21:00Z	0.732	false
2019-07-21T20:45Z	0.733	false
2019-07-21T20:30Z	0.733	false
2019-07-21T20:15Z	0.733	false
2019-07-21T20:00Z	0.734	false
2019-07-21T19:45Z	0.735	false
2019-07-21T19:30Z	0.736	false
2019-07-21T19:15Z	0.732	false
2019-07-21T19:00Z	0.732	false
2019-07-21T18:45Z	0.734	false
2019-07-21T18:30Z	0.737	false
2019-07-21T18:15Z	0.738	false
2019-07-21T18:00Z	0.739	false
2019-07-21T17:45Z	0.74	false
2019-07-21T17:30Z	0.74	false
2019-07-21T17:15Z	0.741	false
2019-07-21T17:00Z	0.742	false
2019-07-21T16:45Z	0.744	false
2019-07-21T16:30Z	0.745	false
2019-07-21T16:15Z	0.744	false
2019-07-21T16:00Z	0.745	false
2019-07-21T15:45Z	0.746	false
2019-07-21T15:30Z	0.746	false
2019-07-21T15:15Z	0.745	false
2019-07-21T15:00Z	0.745	false
2019-07-21T14:45Z	0.744	false
2019-07-21T14:30Z	0.741	false
2019-07-21T14:15Z	0.74	false
2019-07-21T14:00Z	0.737	false
2019-07-21T13:45Z	0.734	false
2019-07-21T13:30Z	0.731	false
2019-07-21T13:15Z	0.726	false
2019-07-21T13:00Z	0.72	false
2019-07-21T12:45Z	0.713	false
2019-07-21T12:30Z	0.706	false
2019-07-21T12:15Z	0.698	false
2019-07-21T12:00Z	0.691	false
2019-07-21T11:45Z	0.683	false
2019-07-21T11:30Z	0.676	false
2019-07-21T11:15Z	0.67	false
2019-07-21T11:00Z	0.666	false
2019-07-21T10:45Z	0.662	false
2019-07-21T10:30Z	0.661	false
2019-07-21T10:15Z	0.661	false
2019-07-21T10:00Z	0.661	false
2019-07-21T09:45Z	0.661	false
2019-07-21T09:30Z	0.661	false
2019-07-21T09:15Z	0.661	false
2019-07-21T09:00Z	0.662	false
2019-07-21T08:45Z	0.663	false
2019-07-21T08:30Z	0.664	false
2019-07-21T08:15Z	0.665	false
2019-07-21T08:00Z	0.667	false
2019-07-21T07:45Z	0.668	false
2019-07-21T07:30Z	0.67	false
2019-07-21T07:15Z	0.672	false
2019-07-21T07:00Z	0.674	false
2019-07-21T06:45Z	0.677	false
2019-07-21T06:30Z	0.68	false
2019-07-21T06:15Z	0.682	false
2019-07-21T06:00Z	0.685	false
2019-07-21T05:45Z	0.688	false
2019-07-21T05:30Z	0.691	false
2019-07-21T05:15Z	0.693	false
2019-07-21T05:00Z	0.696	false
2019-07-21T04:45Z	0.698	false
2019-07-21T04:30Z	0.701	false
2019-07-21T04:15Z	0.704	false
2019-07-21T04:00Z	0.706	false
2019-07-21T03:45Z	0.709	false
2019-07-21T03:30Z	0.711	false
2019-07-21T03:15Z	0.713	false
2019-07-21T03:00Z	0.715	false
2019-07-21T02:45Z	0.717	false
2019-07-21T02:30Z	0.719	false
2019-07-21T02:15Z	0.72	false
2019-07-21T02:00Z	0.723	false
2019-07-21T01:45Z	0.724	false
2019-07-21T01:30Z	0.724	false
2019-07-21T01:15Z	0.725	false
2019-07-21T01:00Z	0.725	false
2019-07-21T00:45Z	0.726	false
2019-07-21T00:30Z	0.726	false
2019-07-21T00:15Z	0.727	false
2019-07-21T00:00Z	0.727	false
2019-07-20T23:45Z	0.728	false
2019-07-20T23:30Z	0.728	false
2019-07-20T23:15Z	0.728	false
2019-07-20T23:00Z	0.728	false
2019-07-20T22:45Z	0.728	false
2019-07-20T22:30Z	0.728	false
2019-07-20T22:15Z	0.728	false
2019-07-20T22:00Z	0.728	false
2019-07-20T21:45Z	0.728	false
2019-07-20T21:30Z	0.728	false
2019-07-20T21:15Z	0.729	false
2019-07-20T21:00Z	0.73	false
2019-07-20T20:45Z	0.73	false
2019-07-20T20:30Z	0.731	false
2019-07-20T20:15Z	0.731	false
2019-07-20T20:00Z	0.731	false
2019-07-20T19:45Z	0.732	false
2019-07-20T19:30Z	0.734	false
2019-07-20T19:15Z	0.734	false
2019-07-20T19:00Z	0.735	false
2019-07-20T18:45Z	0.735	false
2019-07-20T18:30Z	0.737	false
2019-07-20T18:15Z	0.738	false
2019-07-20T18:00Z	0.738	false
2019-07-20T17:45Z	0.738	false
2019-07-20T17:30Z	0.74	false
2019-07-20T17:15Z	0.741	false
2019-07-20T17:00Z	0.742	false
2019-07-20T16:45Z	0.743	false
2019-07-20T16:30Z	0.744	false
2019-07-20T16:15Z	0.744	false
2019-07-20T16:00Z	0.745	false
2019-07-20T15:45Z	0.746	false
2019-07-20T15:30Z	0.745	false
2019-07-20T15:15Z	0.746	false
2019-07-20T15:00Z	0.745	false
2019-07-20T14:45Z	0.744	false
2019-07-20T14:30Z	0.743	false
2019-07-20T14:15Z	0.743	false
2019-07-20T14:00Z	0.74	false
2019-07-20T13:45Z	0.734	false
2019-07-20T13:30Z	0.738	false
2019-07-20T13:15Z	0.734	false
2019-07-20T13:00Z	0.731	false
2019-07-20T12:45Z	0.728	false
2019-07-20T12:30Z	0.725	false
2019-07-20T12:15Z	0.721	false
2019-07-20T12:00Z	0.718	false
2019-07-20T11:45Z	0.715	false
2019-07-20T11:30Z	0.714	false
2019-07-20T11:15Z	0.712	false
2019-07-20T11:00Z	0.711	false
2019-07-20T10:45Z	0.712	false
2019-07-20T10:30Z	0.713	false
2019-07-20T10:15Z	0.714	false
2019-07-20T10:00Z	0.717	false
2019-07-20T09:45Z	0.719	false
2019-07-20T09:30Z	0.722	false
2019-07-20T09:15Z	0.725	false
2019-07-20T09:00Z	0.728	false
2019-07-20T08:45Z	0.73	false
2019-07-20T08:30Z	0.732	false
2019-07-20T08:15Z	0.736	false
2019-07-20T08:00Z	0.739	false
2019-07-20T07:45Z	0.744	false
2019-07-20T07:30Z	0.748	false
2019-07-20T07:15Z	0.751	false
2019-07-20T07:00Z	0.755	false
2019-07-20T06:45Z	0.759	false
2019-07-20T06:30Z	0.763	false
2019-07-20T06:15Z	0.768	false
2019-07-20T06:00Z	0.771	false
2019-07-20T05:45Z	0.771	false
2019-07-20T05:30Z	0.769	false
2019-07-20T05:15Z	0.762	false
2019-07-20T05:00Z	0.754	false
2019-07-20T04:45Z	0.745	false
2019-07-20T04:30Z	0.735	false
2019-07-20T04:15Z	0.727	false
2019-07-20T04:00Z	0.724	false
2019-07-20T03:45Z	0.723	false
2019-07-20T03:30Z	0.724	false
2019-07-20T03:15Z	0.725	false
2019-07-20T03:00Z	0.726	false
2019-07-20T02:45Z	0.728	false
2019-07-20T02:30Z	0.73	false
2019-07-20T02:15Z	0.731	false
2019-07-20T02:00Z	0.733	false
2019-07-20T01:45Z	0.735	false
2019-07-20T01:30Z	0.737	false
2019-07-20T01:15Z	0.738	false
2019-07-20T01:00Z	0.739	false
2019-07-20T00:45Z	0.74	false
2019-07-20T00:30Z	0.741	false
2019-07-20T00:15Z	0.743	false
2019-07-20T00:00Z	0.743	false
2019-07-19T23:45Z	0.744	false
2019-07-19T23:30Z	0.744	false
2019-07-19T23:15Z	0.746	false
2019-07-19T23:00Z	0.746	false
2019-07-19T22:45Z	0.747	false
2019-07-19T22:30Z	0.747	false
2019-07-19T22:15Z	0.747	false
2019-07-19T22:00Z	0.745	false
2019-07-19T21:45Z	0.745	false
2019-07-19T21:30Z	0.743	false
2019-07-19T21:15Z	0.741	false
2019-07-19T21:00Z	0.738	false
2019-07-19T20:45Z	0.736	false
2019-07-19T20:30Z	0.734	false
2019-07-19T20:15Z	0.733	false
2019-07-19T20:00Z	0.732	false
2019-07-19T19:45Z	0.732	false
2019-07-19T19:30Z	0.731	false
2019-07-19T19:15Z	0.732	false
2019-07-19T19:00Z	0.733	false
2019-07-19T18:45Z	0.734	false
2019-07-19T18:30Z	0.735	false
2019-07-19T18:15Z	0.737	false
2019-07-19T18:00Z	0.739	false
2019-07-19T17:45Z	0.741	false
2019-07-19T17:30Z	0.743	false
2019-07-19T17:15Z	0.746	false
2019-07-19T17:00Z	0.748	false
2019-07-19T16:45Z	0.75	false
2019-07-19T16:30Z	0.754	false
2019-07-19T16:15Z	0.758	false
2019-07-19T16:00Z	0.76	false
2019-07-19T15:45Z	0.763	false
2019-07-19T15:30Z	0.766	false
2019-07-19T15:15Z	0.768	false
2019-07-19T15:00Z	0.77	false
2019-07-19T14:45Z	0.77	false
2019-07-19T14:30Z	0.768	false
2019-07-19T14:15Z	0.763	false
2019-07-19T14:00Z	0.754	false
2019-07-19T13:45Z	0.751	false
2019-07-19T13:30Z	0.744	false
2019-07-19T13:15Z	0.739	false
2019-07-19T13:00Z	0.735	false
2019-07-19T12:45Z	0.733	false
2019-07-19T12:30Z	0.73	false
2019-07-19T12:15Z	0.728	false
2019-07-19T12:00Z	0.726	false
2019-07-19T11:45Z	0.722	false
2019-07-19T11:30Z	0.717	false
2019-07-19T11:15Z	0.711	false
2019-07-19T11:00Z	0.704	false
2019-07-19T10:45Z	0.696	false
2019-07-19T10:30Z	0.687	false
2019-07-19T10:15Z	0.679	false
2019-07-19T10:00Z	0.674	false
2019-07-19T09:45Z	0.67	false
2019-07-19T09:30Z	0.666	false
2019-07-19T09:15Z	0.665	false
2019-07-19T09:00Z	0.664	false
2019-07-19T08:45Z	0.664	false
2019-07-19T08:30Z	0.664	false
2019-07-19T08:15Z	0.665	false
2019-07-19T08:00Z	0.666	false
2019-07-19T07:45Z	0.667	false
2019-07-19T07:30Z	0.669	false
2019-07-19T07:15Z	0.671	false
2019-07-19T07:00Z	0.672	false
2019-07-19T06:45Z	0.675	false
2019-07-19T06:30Z	0.677	false
2019-07-19T06:15Z	0.679	false
2019-07-19T06:00Z	0.682	false
2019-07-19T05:45Z	0.685	false
2019-07-19T05:30Z	0.689	false
2019-07-19T05:15Z	0.692	false
2019-07-19T05:00Z	0.695	false
2019-07-19T04:45Z	0.699	false
2019-07-19T04:30Z	0.701	false
2019-07-19T04:15Z	0.705	false
2019-07-19T04:00Z	0.708	false
2019-07-19T03:45Z	0.712	false
2019-07-19T03:30Z	0.715	false
2019-07-19T03:15Z	0.718	false
2019-07-19T03:00Z	0.721	false
2019-07-19T02:45Z	0.723	false
2019-07-19T02:30Z	0.725	false
2019-07-19T02:15Z	0.729	false
2019-07-19T02:00Z	0.73	false
2019-07-19T01:45Z	0.732	false
2019-07-19T01:30Z	0.734	false
2019-07-19T01:15Z	0.735	false
2019-07-19T01:00Z	0.736	false
2019-07-19T00:45Z	0.736	false
2019-07-19T00:30Z	0.736	false
2019-07-19T00:15Z	0.737	false
2019-07-19T00:00Z	0.737	false
2019-07-18T23:45Z	0.737	false
2019-07-18T23:30Z	0.736	false
2019-07-18T23:15Z	0.736	false
2019-07-18T23:00Z	0.735	false
2019-07-18T22:45Z	0.735	false
2019-07-18T22:30Z	0.735	false
2019-07-18T22:15Z	0.733	false
2019-07-18T22:00Z	0.732	false
2019-07-18T21:45Z	0.731	false
2019-07-18T21:30Z	0.73	false
2019-07-18T21:15Z	0.729	false
2019-07-18T21:00Z	0.728	false
2019-07-18T20:45Z	0.727	false
2019-07-18T20:30Z	0.726	false
2019-07-18T20:15Z	0.726	false
2019-07-18T20:00Z	0.725	false
2019-07-18T19:45Z	0.725	false
2019-07-18T19:30Z	0.724	false
2019-07-18T19:15Z	0.724	false
2019-07-18T19:00Z	0.724	false
2019-07-18T18:45Z	0.724	false
2019-07-18T18:30Z	0.724	false
2019-07-18T18:15Z	0.724	false
2019-07-18T18:00Z	0.725	false
2019-07-18T17:45Z	0.725	false
2019-07-18T17:30Z	0.725	false
2019-07-18T17:15Z	0.725	false
2019-07-18T17:00Z	0.726	false
2019-07-18T16:45Z	0.727	false
2019-07-18T16:30Z	0.728	false
2019-07-18T16:15Z	0.728	false
2019-07-18T16:00Z	0.729	false
2019-07-18T15:45Z	0.729	false
2019-07-18T15:30Z	0.729	false
2019-07-18T15:15Z	0.729	false
2019-07-18T15:00Z	0.729	false
2019-07-18T14:45Z	0.73	false
2019-07-18T14:30Z	0.73	false
2019-07-18T14:15Z	0.73	false
2019-07-18T14:00Z	0.73	false
2019-07-18T13:45Z	0.731	false
2019-07-18T13:30Z	0.733	false
2019-07-18T13:15Z	0.731	false
2019-07-18T13:00Z	0.731	false
2019-07-18T12:45Z	0.732	false
2019-07-18T12:30Z	0.732	false
2019-07-18T12:15Z	0.73	false
2019-07-18T12:00Z	0.729	false
2019-07-18T11:45Z	0.727	false
2019-07-18T11:30Z	0.722	false
2019-07-18T11:15Z	0.717	false
2019-07-18T11:00Z	0.71	false
2019-07-18T10:45Z	0.702	false
2019-07-18T10:30Z	0.693	false
2019-07-18T10:15Z	0.685	false
2019-07-18T10:00Z	0.677	false
2019-07-18T09:45Z	0.672	false
2019-07-18T09:30Z	0.667	false
2019-07-18T09:15Z	0.664	false
2019-07-18T09:00Z	0.662	false
2019-07-18T08:45Z	0.662	false
2019-07-18T08:30Z	0.662	false
2019-07-18T08:15Z	0.663	false
2019-07-18T08:00Z	0.663	false
2019-07-18T07:45Z	0.665	false
2019-07-18T07:30Z	0.667	false
2019-07-18T07:15Z	0.669	false
2019-07-18T07:00Z	0.671	false
2019-07-18T06:45Z	0.673	false
2019-07-18T06:30Z	0.675	false
2019-07-18T06:15Z	0.678	false
2019-07-18T06:00Z	0.68	false
2019-07-18T05:45Z	0.683	false
2019-07-18T05:30Z	0.686	false
2019-07-18T05:15Z	0.689	false
2019-07-18T05:00Z	0.693	false
2019-07-18T04:45Z	0.696	false

Forecast data

Key information

• Station name: Harpenden
• Station ID: 7332
• River name: River Lee
• Typical range: 0.70m to 1.12m
• Highest level on record: 1.63m on 28 May 2007
• Site datum: 87.00mAOD (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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