River level River Lee at Harpenden

Check for flood warnings in this area

Latest recorded level 0.84m at 5:30am Thursday 24 September 2020.

River levels at this location in the last 5 days

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• Measured level
• When the water level reaches 1.30m here, minor flooding is possible in this area
• Highest recorded level. Hide
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Observed data

DateTime	Value	Error
2020-09-24T04:30Z	0.838	false
2020-09-24T04:15Z	0.84	false
2020-09-24T04:00Z	0.844	false
2020-09-24T03:45Z	0.845	false
2020-09-24T03:30Z	0.846	false
2020-09-24T03:15Z	0.85	false
2020-09-24T03:00Z	0.851	false
2020-09-24T02:45Z	0.854	false
2020-09-24T02:30Z	0.856	false
2020-09-24T02:15Z	0.859	false
2020-09-24T02:00Z	0.859	false
2020-09-24T01:45Z	0.862	false
2020-09-24T01:30Z	0.863	false
2020-09-24T01:15Z	0.868	false
2020-09-24T01:00Z	0.869	false
2020-09-24T00:45Z	0.872	false
2020-09-24T00:30Z	0.873	false
2020-09-24T00:15Z	0.875	false
2020-09-24T00:00Z	0.872	false
2020-09-23T23:45Z	0.871	false
2020-09-23T23:30Z	0.869	false
2020-09-23T23:15Z	0.869	false
2020-09-23T23:00Z	0.863	false
2020-09-23T22:45Z	0.868	false
2020-09-23T22:30Z	0.864	false
2020-09-23T22:15Z	0.862	false
2020-09-23T22:00Z	0.861	false
2020-09-23T21:45Z	0.858	false
2020-09-23T21:30Z	0.855	false
2020-09-23T21:15Z	0.851	false
2020-09-23T21:00Z	0.849	false
2020-09-23T20:45Z	0.85	false
2020-09-23T20:30Z	0.849	false
2020-09-23T20:15Z	0.848	false
2020-09-23T20:00Z	0.846	false
2020-09-23T19:45Z	0.846	false
2020-09-23T19:30Z	0.844	false
2020-09-23T19:15Z	0.842	false
2020-09-23T19:00Z	0.838	false
2020-09-23T18:45Z	0.833	false
2020-09-23T18:30Z	0.825	false
2020-09-23T18:15Z	0.82	false
2020-09-23T18:00Z	0.815	false
2020-09-23T17:45Z	0.81	false
2020-09-23T17:30Z	0.808	false
2020-09-23T17:15Z	0.805	false
2020-09-23T17:00Z	0.804	false
2020-09-23T16:45Z	0.805	false
2020-09-23T16:30Z	0.803	false
2020-09-23T16:15Z	0.808	false
2020-09-23T16:00Z	0.802	false
2020-09-23T15:45Z	0.802	false
2020-09-23T15:30Z	0.804	false
2020-09-23T15:15Z	0.805	false
2020-09-23T15:00Z	0.801	false
2020-09-23T14:45Z	0.803	false
2020-09-23T14:30Z	0.802	false
2020-09-23T14:15Z	0.803	false
2020-09-23T14:00Z	0.802	false
2020-09-23T13:45Z	0.803	false
2020-09-23T13:30Z	0.804	false
2020-09-23T13:15Z	0.804	false
2020-09-23T13:00Z	0.805	false
2020-09-23T12:45Z	0.805	false
2020-09-23T12:30Z	0.806	false
2020-09-23T12:15Z	0.806	false
2020-09-23T12:00Z	0.805	false
2020-09-23T11:45Z	0.805	false
2020-09-23T11:30Z	0.805	false
2020-09-23T11:15Z	0.804	false
2020-09-23T11:00Z	0.803	false
2020-09-23T10:45Z	0.803	false
2020-09-23T10:30Z	0.801	false
2020-09-23T10:15Z	0.801	false
2020-09-23T10:00Z	0.8	false
2020-09-23T09:45Z	0.8	false
2020-09-23T09:30Z	0.799	false
2020-09-23T09:15Z	0.8	false
2020-09-23T09:00Z	0.8	false
2020-09-23T08:45Z	0.799	false
2020-09-23T08:30Z	0.796	false
2020-09-23T08:15Z	0.792	false
2020-09-23T08:00Z	0.785	false
2020-09-23T07:45Z	0.772	false
2020-09-23T07:30Z	0.754	false
2020-09-23T07:15Z	0.731	false
2020-09-23T07:00Z	0.709	false
2020-09-23T06:45Z	0.696	false
2020-09-23T06:30Z	0.694	false
2020-09-23T06:15Z	0.693	false
2020-09-23T06:00Z	0.695	false
2020-09-23T05:45Z	0.697	false
2020-09-23T05:30Z	0.699	false
2020-09-23T05:15Z	0.702	false
2020-09-23T05:00Z	0.702	false
2020-09-23T04:45Z	0.703	false
2020-09-23T04:30Z	0.705	false
2020-09-23T04:15Z	0.707	false
2020-09-23T04:00Z	0.709	false
2020-09-23T03:45Z	0.711	false
2020-09-23T03:30Z	0.713	false
2020-09-23T03:15Z	0.715	false
2020-09-23T03:00Z	0.719	false
2020-09-23T02:45Z	0.721	false
2020-09-23T02:30Z	0.723	false
2020-09-23T02:15Z	0.726	false
2020-09-23T02:00Z	0.728	false
2020-09-23T01:45Z	0.73	false
2020-09-23T01:30Z	0.732	false
2020-09-23T01:15Z	0.733	false
2020-09-23T01:00Z	0.735	false
2020-09-23T00:45Z	0.737	false
2020-09-23T00:30Z	0.739	false
2020-09-23T00:15Z	0.74	false
2020-09-23T00:00Z	0.74	false
2020-09-22T23:45Z	0.74	false
2020-09-22T23:30Z	0.741	false
2020-09-22T23:15Z	0.742	false
2020-09-22T23:00Z	0.743	false
2020-09-22T22:45Z	0.744	false
2020-09-22T22:30Z	0.744	false
2020-09-22T22:15Z	0.744	false
2020-09-22T22:00Z	0.744	false
2020-09-22T21:45Z	0.744	false
2020-09-22T21:30Z	0.744	false
2020-09-22T21:15Z	0.744	false
2020-09-22T21:00Z	0.744	false
2020-09-22T20:45Z	0.743	false
2020-09-22T20:30Z	0.742	false
2020-09-22T20:15Z	0.741	false
2020-09-22T20:00Z	0.74	false
2020-09-22T19:45Z	0.739	false
2020-09-22T19:30Z	0.738	false
2020-09-22T19:15Z	0.739	false
2020-09-22T19:00Z	0.739	false
2020-09-22T18:45Z	0.74	false
2020-09-22T18:30Z	0.74	false
2020-09-22T18:15Z	0.74	false
2020-09-22T18:00Z	0.74	false
2020-09-22T17:45Z	0.741	false
2020-09-22T17:30Z	0.741	false
2020-09-22T17:15Z	0.741	false
2020-09-22T17:00Z	0.741	false
2020-09-22T16:45Z	0.741	false
2020-09-22T16:30Z	0.741	false
2020-09-22T16:15Z	0.743	false
2020-09-22T16:00Z	0.743	false
2020-09-22T15:45Z	0.744	false
2020-09-22T15:30Z	0.744	false
2020-09-22T15:15Z	0.743	false
2020-09-22T15:00Z	0.744	false
2020-09-22T14:45Z	0.744	false
2020-09-22T14:30Z	0.745	false
2020-09-22T14:15Z	0.745	false
2020-09-22T14:00Z	0.745	false
2020-09-22T13:45Z	0.744	false
2020-09-22T13:30Z	0.743	false
2020-09-22T13:15Z	0.742	false
2020-09-22T13:00Z	0.74	false
2020-09-22T12:45Z	0.741	false
2020-09-22T12:30Z	0.74	false
2020-09-22T12:15Z	0.739	false
2020-09-22T12:00Z	0.737	false
2020-09-22T11:45Z	0.736	false
2020-09-22T11:30Z	0.732	false
2020-09-22T11:15Z	0.729	false
2020-09-22T11:00Z	0.726	false
2020-09-22T10:45Z	0.721	false
2020-09-22T10:30Z	0.715	false
2020-09-22T10:15Z	0.71	false
2020-09-22T10:00Z	0.703	false
2020-09-22T09:45Z	0.697	false
2020-09-22T09:30Z	0.693	false
2020-09-22T09:15Z	0.689	false
2020-09-22T09:00Z	0.687	false
2020-09-22T08:45Z	0.686	false
2020-09-22T08:30Z	0.684	false
2020-09-22T08:15Z	0.684	false
2020-09-22T08:00Z	0.683	false
2020-09-22T07:45Z	0.684	false
2020-09-22T07:30Z	0.684	false
2020-09-22T07:15Z	0.684	false
2020-09-22T07:00Z	0.686	false
2020-09-22T06:45Z	0.691	false
2020-09-22T06:30Z	0.691	false
2020-09-22T06:15Z	0.693	false
2020-09-22T06:00Z	0.696	false
2020-09-22T05:45Z	0.698	false
2020-09-22T05:30Z	0.701	false
2020-09-22T05:15Z	0.705	false
2020-09-22T05:00Z	0.707	false
2020-09-22T04:45Z	0.71	false
2020-09-22T04:30Z	0.713	false
2020-09-22T04:15Z	0.715	false
2020-09-22T04:00Z	0.718	false
2020-09-22T03:45Z	0.72	false
2020-09-22T03:30Z	0.723	false
2020-09-22T03:15Z	0.724	false
2020-09-22T03:00Z	0.727	false
2020-09-22T02:45Z	0.729	false
2020-09-22T02:30Z	0.73	false
2020-09-22T02:15Z	0.733	false
2020-09-22T02:00Z	0.735	false
2020-09-22T01:45Z	0.736	false
2020-09-22T01:30Z	0.739	false
2020-09-22T01:15Z	0.741	false
2020-09-22T01:00Z	0.742	false
2020-09-22T00:45Z	0.744	false
2020-09-22T00:30Z	0.746	false
2020-09-22T00:15Z	0.748	false
2020-09-22T00:00Z	0.749	false
2020-09-21T23:45Z	0.749	false
2020-09-21T23:30Z	0.751	false
2020-09-21T23:15Z	0.752	false
2020-09-21T23:00Z	0.752	false
2020-09-21T22:45Z	0.751	false
2020-09-21T22:30Z	0.75	false
2020-09-21T22:15Z	0.749	false
2020-09-21T22:00Z	0.748	false
2020-09-21T21:45Z	0.747	false
2020-09-21T21:30Z	0.747	false
2020-09-21T21:15Z	0.747	false
2020-09-21T21:00Z	0.746	false
2020-09-21T20:45Z	0.746	false
2020-09-21T20:30Z	0.746	false
2020-09-21T20:15Z	0.746	false
2020-09-21T20:00Z	0.745	false
2020-09-21T19:45Z	0.744	false
2020-09-21T19:30Z	0.743	false
2020-09-21T19:15Z	0.742	false
2020-09-21T19:00Z	0.742	false
2020-09-21T18:45Z	0.743	false
2020-09-21T18:30Z	0.743	false
2020-09-21T18:15Z	0.743	false
2020-09-21T18:00Z	0.743	false
2020-09-21T17:45Z	0.744	false
2020-09-21T17:30Z	0.745	false
2020-09-21T17:15Z	0.746	false
2020-09-21T17:00Z	0.746	false
2020-09-21T16:45Z	0.748	false
2020-09-21T16:30Z	0.748	false
2020-09-21T16:15Z	0.747	false
2020-09-21T16:00Z	0.746	false
2020-09-21T15:45Z	0.746	false
2020-09-21T15:30Z	0.746	false
2020-09-21T15:15Z	0.746	false
2020-09-21T15:00Z	0.745	false
2020-09-21T14:45Z	0.746	false
2020-09-21T14:30Z	0.746	false
2020-09-21T14:15Z	0.747	false
2020-09-21T14:00Z	0.746	false
2020-09-21T13:45Z	0.747	false
2020-09-21T13:30Z	0.747	false
2020-09-21T13:15Z	0.747	false
2020-09-21T13:00Z	0.747	false
2020-09-21T12:45Z	0.747	false
2020-09-21T12:30Z	0.746	false
2020-09-21T12:15Z	0.745	false
2020-09-21T12:00Z	0.744	false
2020-09-21T11:45Z	0.742	false
2020-09-21T11:30Z	0.74	false
2020-09-21T11:15Z	0.736	false
2020-09-21T11:00Z	0.731	false
2020-09-21T10:45Z	0.725	false
2020-09-21T10:30Z	0.719	false
2020-09-21T10:15Z	0.715	false
2020-09-21T10:00Z	0.709	false
2020-09-21T09:45Z	0.705	false
2020-09-21T09:30Z	0.7	false
2020-09-21T09:15Z	0.697	false
2020-09-21T09:00Z	0.694	false
2020-09-21T08:45Z	0.692	false
2020-09-21T08:30Z	0.689	false
2020-09-21T08:15Z	0.689	false
2020-09-21T08:00Z	0.689	false
2020-09-21T07:45Z	0.689	false
2020-09-21T07:30Z	0.69	false
2020-09-21T07:15Z	0.692	false
2020-09-21T07:00Z	0.693	false
2020-09-21T06:45Z	0.694	false
2020-09-21T06:30Z	0.697	false
2020-09-21T06:15Z	0.699	false
2020-09-21T06:00Z	0.701	false
2020-09-21T05:45Z	0.703	false
2020-09-21T05:30Z	0.705	false
2020-09-21T05:15Z	0.708	false
2020-09-21T05:00Z	0.709	false
2020-09-21T04:45Z	0.712	false
2020-09-21T04:30Z	0.713	false
2020-09-21T04:15Z	0.715	false
2020-09-21T04:00Z	0.717	false
2020-09-21T03:45Z	0.719	false
2020-09-21T03:30Z	0.721	false
2020-09-21T03:15Z	0.724	false
2020-09-21T03:00Z	0.726	false
2020-09-21T02:45Z	0.729	false
2020-09-21T02:30Z	0.731	false
2020-09-21T02:15Z	0.734	false
2020-09-21T02:00Z	0.735	false
2020-09-21T01:45Z	0.738	false
2020-09-21T01:30Z	0.74	false
2020-09-21T01:15Z	0.743	false
2020-09-21T01:00Z	0.744	false
2020-09-21T00:45Z	0.747	false
2020-09-21T00:30Z	0.748	false
2020-09-21T00:15Z	0.751	false
2020-09-21T00:00Z	0.752	false
2020-09-20T23:45Z	0.753	false
2020-09-20T23:30Z	0.753	false
2020-09-20T23:15Z	0.753	false
2020-09-20T23:00Z	0.753	false
2020-09-20T22:45Z	0.753	false
2020-09-20T22:30Z	0.753	false
2020-09-20T22:15Z	0.753	false
2020-09-20T22:00Z	0.752	false
2020-09-20T21:45Z	0.752	false
2020-09-20T21:30Z	0.751	false
2020-09-20T21:15Z	0.75	false
2020-09-20T21:00Z	0.749	false
2020-09-20T20:45Z	0.749	false
2020-09-20T20:30Z	0.749	false
2020-09-20T20:15Z	0.749	false
2020-09-20T20:00Z	0.748	false
2020-09-20T19:45Z	0.748	false
2020-09-20T19:30Z	0.747	false
2020-09-20T19:15Z	0.748	false
2020-09-20T19:00Z	0.749	false
2020-09-20T18:45Z	0.751	false
2020-09-20T18:30Z	0.751	false
2020-09-20T18:15Z	0.752	false
2020-09-20T18:00Z	0.753	false
2020-09-20T17:45Z	0.753	false
2020-09-20T17:30Z	0.755	false
2020-09-20T17:15Z	0.757	false
2020-09-20T17:00Z	0.758	false
2020-09-20T16:45Z	0.759	false
2020-09-20T16:30Z	0.76	false
2020-09-20T16:15Z	0.76	false
2020-09-20T16:00Z	0.76	false
2020-09-20T15:45Z	0.759	false
2020-09-20T15:30Z	0.761	false
2020-09-20T15:15Z	0.761	false
2020-09-20T15:00Z	0.76	false
2020-09-20T14:45Z	0.761	false
2020-09-20T14:30Z	0.761	false
2020-09-20T14:15Z	0.759	false
2020-09-20T14:00Z	0.757	false
2020-09-20T13:45Z	0.754	false
2020-09-20T13:30Z	0.749	false
2020-09-20T13:15Z	0.747	false
2020-09-20T13:00Z	0.742	false
2020-09-20T12:45Z	0.736	false
2020-09-20T12:30Z	0.73	false
2020-09-20T12:15Z	0.724	false
2020-09-20T12:00Z	0.718	false
2020-09-20T11:45Z	0.712	false
2020-09-20T11:30Z	0.707	false
2020-09-20T11:15Z	0.702	false
2020-09-20T11:00Z	0.698	false
2020-09-20T10:45Z	0.696	false
2020-09-20T10:30Z	0.694	false
2020-09-20T10:15Z	0.691	false
2020-09-20T10:00Z	0.69	false
2020-09-20T09:45Z	0.69	false
2020-09-20T09:30Z	0.687	false
2020-09-20T09:15Z	0.686	false
2020-09-20T09:00Z	0.686	false
2020-09-20T08:45Z	0.686	false
2020-09-20T08:30Z	0.686	false
2020-09-20T08:15Z	0.686	false
2020-09-20T08:00Z	0.689	false
2020-09-20T07:45Z	0.689	false
2020-09-20T07:30Z	0.691	false
2020-09-20T07:15Z	0.693	false
2020-09-20T07:00Z	0.694	false
2020-09-20T06:45Z	0.697	false
2020-09-20T06:30Z	0.699	false
2020-09-20T06:15Z	0.7	false
2020-09-20T06:00Z	0.703	false
2020-09-20T05:45Z	0.706	false
2020-09-20T05:30Z	0.708	false
2020-09-20T05:15Z	0.71	false
2020-09-20T05:00Z	0.711	false
2020-09-20T04:45Z	0.713	false
2020-09-20T04:30Z	0.715	false
2020-09-20T04:15Z	0.717	false
2020-09-20T04:00Z	0.718	false
2020-09-20T03:45Z	0.721	false
2020-09-20T03:30Z	0.723	false
2020-09-20T03:15Z	0.725	false
2020-09-20T03:00Z	0.727	false
2020-09-20T02:45Z	0.729	false
2020-09-20T02:30Z	0.732	false
2020-09-20T02:15Z	0.734	false
2020-09-20T02:00Z	0.735	false
2020-09-20T01:45Z	0.736	false
2020-09-20T01:30Z	0.738	false
2020-09-20T01:15Z	0.74	false
2020-09-20T01:00Z	0.741	false
2020-09-20T00:45Z	0.742	false
2020-09-20T00:30Z	0.744	false
2020-09-20T00:15Z	0.745	false
2020-09-20T00:00Z	0.745	false
2020-09-19T23:45Z	0.745	false
2020-09-19T23:30Z	0.746	false
2020-09-19T23:15Z	0.746	false
2020-09-19T23:00Z	0.747	false
2020-09-19T22:45Z	0.747	false
2020-09-19T22:30Z	0.748	false
2020-09-19T22:15Z	0.748	false
2020-09-19T22:00Z	0.748	false
2020-09-19T21:45Z	0.749	false
2020-09-19T21:30Z	0.748	false
2020-09-19T21:15Z	0.748	false
2020-09-19T21:00Z	0.748	false
2020-09-19T20:45Z	0.749	false
2020-09-19T20:30Z	0.749	false
2020-09-19T20:15Z	0.75	false
2020-09-19T20:00Z	0.75	false
2020-09-19T19:45Z	0.751	false
2020-09-19T19:30Z	0.75	false
2020-09-19T19:15Z	0.751	false
2020-09-19T19:00Z	0.751	false
2020-09-19T18:45Z	0.752	false
2020-09-19T18:30Z	0.752	false
2020-09-19T18:15Z	0.753	false
2020-09-19T18:00Z	0.755	false
2020-09-19T17:45Z	0.757	false
2020-09-19T17:30Z	0.757	false
2020-09-19T17:15Z	0.759	false
2020-09-19T17:00Z	0.76	false
2020-09-19T16:45Z	0.761	false
2020-09-19T16:30Z	0.76	false
2020-09-19T16:15Z	0.762	false
2020-09-19T16:00Z	0.761	false
2020-09-19T15:45Z	0.762	false
2020-09-19T15:30Z	0.761	false
2020-09-19T15:15Z	0.759	false
2020-09-19T15:00Z	0.76	false
2020-09-19T14:45Z	0.76	false
2020-09-19T14:30Z	0.76	false
2020-09-19T14:15Z	0.758	false
2020-09-19T14:00Z	0.759	false
2020-09-19T13:45Z	0.757	false
2020-09-19T13:30Z	0.755	false
2020-09-19T13:15Z	0.753	false
2020-09-19T13:00Z	0.75	false
2020-09-19T12:45Z	0.746	false
2020-09-19T12:30Z	0.742	false
2020-09-19T12:15Z	0.737	false
2020-09-19T12:00Z	0.729	false
2020-09-19T11:45Z	0.724	false
2020-09-19T11:30Z	0.717	false
2020-09-19T11:15Z	0.713	false
2020-09-19T11:00Z	0.707	false
2020-09-19T10:45Z	0.703	false
2020-09-19T10:30Z	0.699	false
2020-09-19T10:15Z	0.696	false
2020-09-19T10:00Z	0.694	false
2020-09-19T09:45Z	0.692	false
2020-09-19T09:30Z	0.691	false
2020-09-19T09:15Z	0.69	false
2020-09-19T09:00Z	0.688	false
2020-09-19T08:45Z	0.688	false
2020-09-19T08:30Z	0.687	false
2020-09-19T08:15Z	0.686	false
2020-09-19T08:00Z	0.686	false
2020-09-19T07:45Z	0.688	false
2020-09-19T07:30Z	0.688	false
2020-09-19T07:15Z	0.691	false
2020-09-19T07:00Z	0.693	false
2020-09-19T06:45Z	0.695	false
2020-09-19T06:30Z	0.697	false
2020-09-19T06:15Z	0.699	false
2020-09-19T06:00Z	0.702	false
2020-09-19T05:45Z	0.705	false
2020-09-19T05:30Z	0.707	false
2020-09-19T05:15Z	0.709	false
2020-09-19T05:00Z	0.712	false
2020-09-19T04:45Z	0.715	false

Forecast data

Key information

• Station name: Harpenden
• Station ID: 7332
• River name: River Lee
• Typical range: 0.70m to 1.30m
• 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
• Check the long term flood risk for an area in England.

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