River level River Lee at Harpenden

Check for flood warnings in this area

Latest recorded level 0.87m at 4:30am Wednesday 3 March 2021.

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
2021-03-03T04:30Z	0.872	false
2021-03-03T04:15Z	0.873	false
2021-03-03T04:00Z	0.874	false
2021-03-03T03:45Z	0.875	false
2021-03-03T03:30Z	0.875	false
2021-03-03T03:15Z	0.876	false
2021-03-03T03:00Z	0.878	false
2021-03-03T02:45Z	0.879	false
2021-03-03T02:30Z	0.881	false
2021-03-03T02:15Z	0.882	false
2021-03-03T02:00Z	0.883	false
2021-03-03T01:45Z	0.884	false
2021-03-03T01:30Z	0.885	false
2021-03-03T01:15Z	0.886	false
2021-03-03T01:00Z	0.888	false
2021-03-03T00:45Z	0.889	false
2021-03-03T00:30Z	0.89	false
2021-03-03T00:15Z	0.892	false
2021-03-03T00:00Z	0.892	false
2021-03-02T23:45Z	0.892	false
2021-03-02T23:30Z	0.891	false
2021-03-02T23:15Z	0.893	false
2021-03-02T23:00Z	0.892	false
2021-03-02T22:45Z	0.89	false
2021-03-02T22:30Z	0.892	false
2021-03-02T22:15Z	0.892	false
2021-03-02T22:00Z	0.891	false
2021-03-02T21:45Z	0.891	false
2021-03-02T21:30Z	0.892	false
2021-03-02T21:15Z	0.892	false
2021-03-02T21:00Z	0.892	false
2021-03-02T20:45Z	0.892	false
2021-03-02T20:30Z	0.891	false
2021-03-02T20:15Z	0.89	false
2021-03-02T20:00Z	0.889	false
2021-03-02T19:45Z	0.889	false
2021-03-02T19:30Z	0.888	false
2021-03-02T19:15Z	0.887	false
2021-03-02T19:00Z	0.887	false
2021-03-02T18:45Z	0.887	false
2021-03-02T18:30Z	0.887	false
2021-03-02T18:15Z	0.889	false
2021-03-02T18:00Z	0.889	false
2021-03-02T17:45Z	0.889	false
2021-03-02T17:30Z	0.889	false
2021-03-02T17:15Z	0.891	false
2021-03-02T17:00Z	0.892	false
2021-03-02T16:45Z	0.892	false
2021-03-02T16:30Z	0.892	false
2021-03-02T16:15Z	0.892	false
2021-03-02T16:00Z	0.892	false
2021-03-02T15:45Z	0.891	false
2021-03-02T15:30Z	0.89	false
2021-03-02T15:15Z	0.89	false
2021-03-02T15:00Z	0.89	false
2021-03-02T14:45Z	0.891	false
2021-03-02T14:30Z	0.889	false
2021-03-02T14:15Z	0.89	false
2021-03-02T14:00Z	0.89	false
2021-03-02T13:45Z	0.89	false
2021-03-02T13:30Z	0.89	false
2021-03-02T13:15Z	0.889	false
2021-03-02T13:00Z	0.89	false
2021-03-02T12:45Z	0.889	false
2021-03-02T12:30Z	0.889	false
2021-03-02T12:15Z	0.888	false
2021-03-02T12:00Z	0.885	false
2021-03-02T11:45Z	0.885	false
2021-03-02T11:30Z	0.883	false
2021-03-02T11:15Z	0.882	false
2021-03-02T11:00Z	0.88	false
2021-03-02T10:45Z	0.88	false
2021-03-02T10:30Z	0.877	false
2021-03-02T10:15Z	0.876	false
2021-03-02T10:00Z	0.874	false
2021-03-02T09:45Z	0.873	false
2021-03-02T09:30Z	0.871	false
2021-03-02T09:15Z	0.87	false
2021-03-02T09:00Z	0.869	false
2021-03-02T08:45Z	0.868	false
2021-03-02T08:30Z	0.867	false
2021-03-02T08:15Z	0.866	false
2021-03-02T08:00Z	0.865	false
2021-03-02T07:45Z	0.866	false
2021-03-02T07:30Z	0.865	false
2021-03-02T07:15Z	0.865	false
2021-03-02T07:00Z	0.865	false
2021-03-02T06:45Z	0.865	false
2021-03-02T06:30Z	0.866	false
2021-03-02T06:15Z	0.867	false
2021-03-02T06:00Z	0.867	false
2021-03-02T05:45Z	0.868	false
2021-03-02T05:30Z	0.869	false
2021-03-02T05:15Z	0.871	false
2021-03-02T05:00Z	0.871	false
2021-03-02T04:45Z	0.872	false
2021-03-02T04:30Z	0.873	false
2021-03-02T04:15Z	0.873	false
2021-03-02T04:00Z	0.874	false
2021-03-02T03:45Z	0.876	false
2021-03-02T03:30Z	0.877	false
2021-03-02T03:15Z	0.878	false
2021-03-02T03:00Z	0.879	false
2021-03-02T02:45Z	0.88	false
2021-03-02T02:30Z	0.882	false
2021-03-02T02:15Z	0.884	false
2021-03-02T02:00Z	0.884	false
2021-03-02T01:45Z	0.886	false
2021-03-02T01:30Z	0.887	false
2021-03-02T01:15Z	0.889	false
2021-03-02T01:00Z	0.889	false
2021-03-02T00:45Z	0.89	false
2021-03-02T00:30Z	0.89	false
2021-03-02T00:15Z	0.89	false
2021-03-02T00:00Z	0.891	false
2021-03-01T23:45Z	0.892	false
2021-03-01T23:30Z	0.892	false
2021-03-01T23:15Z	0.893	false
2021-03-01T23:00Z	0.893	false
2021-03-01T22:45Z	0.894	false
2021-03-01T22:30Z	0.894	false
2021-03-01T22:15Z	0.894	false
2021-03-01T22:00Z	0.894	false
2021-03-01T21:45Z	0.894	false
2021-03-01T21:30Z	0.894	false
2021-03-01T21:15Z	0.894	false
2021-03-01T21:00Z	0.893	false
2021-03-01T20:45Z	0.893	false
2021-03-01T20:30Z	0.89	false
2021-03-01T20:15Z	0.891	false
2021-03-01T20:00Z	0.891	false
2021-03-01T19:45Z	0.89	false
2021-03-01T19:30Z	0.891	false
2021-03-01T19:15Z	0.89	false
2021-03-01T19:00Z	0.89	false
2021-03-01T18:45Z	0.891	false
2021-03-01T18:30Z	0.892	false
2021-03-01T18:15Z	0.892	false
2021-03-01T18:00Z	0.893	false
2021-03-01T17:45Z	0.893	false
2021-03-01T17:30Z	0.894	false
2021-03-01T17:15Z	0.893	false
2021-03-01T17:00Z	0.894	false
2021-03-01T16:45Z	0.892	false
2021-03-01T16:30Z	0.892	false
2021-03-01T16:15Z	0.893	false
2021-03-01T16:00Z	0.894	false
2021-03-01T15:45Z	0.893	false
2021-03-01T15:30Z	0.893	false
2021-03-01T15:15Z	0.892	false
2021-03-01T15:00Z	0.892	false
2021-03-01T14:45Z	0.892	false
2021-03-01T14:30Z	0.891	false
2021-03-01T14:15Z	0.893	false
2021-03-01T14:00Z	0.893	false
2021-03-01T13:45Z	0.894	false
2021-03-01T13:30Z	0.893	false
2021-03-01T13:15Z	0.892	false
2021-03-01T13:00Z	0.891	false
2021-03-01T12:45Z	0.89	false
2021-03-01T12:30Z	0.889	false
2021-03-01T12:15Z	0.889	false
2021-03-01T12:00Z	0.888	false
2021-03-01T11:45Z	0.888	false
2021-03-01T11:30Z	0.886	false
2021-03-01T11:15Z	0.884	false
2021-03-01T11:00Z	0.882	false
2021-03-01T10:45Z	0.881	false
2021-03-01T10:30Z	0.879	false
2021-03-01T10:15Z	0.878	false
2021-03-01T10:00Z	0.877	false
2021-03-01T09:45Z	0.876	false
2021-03-01T09:30Z	0.873	false
2021-03-01T09:15Z	0.87	false
2021-03-01T09:00Z	0.868	false
2021-03-01T08:45Z	0.868	false
2021-03-01T08:30Z	0.867	false
2021-03-01T08:15Z	0.866	false
2021-03-01T08:00Z	0.866	false
2021-03-01T07:45Z	0.866	false
2021-03-01T07:30Z	0.866	false
2021-03-01T07:15Z	0.866	false
2021-03-01T07:00Z	0.866	false
2021-03-01T06:45Z	0.866	false
2021-03-01T06:30Z	0.866	false
2021-03-01T06:15Z	0.867	false
2021-03-01T06:00Z	0.868	false
2021-03-01T05:45Z	0.869	false
2021-03-01T05:30Z	0.868	false
2021-03-01T05:15Z	0.869	false
2021-03-01T05:00Z	0.869	false
2021-03-01T04:45Z	0.87	false
2021-03-01T04:30Z	0.871	false
2021-03-01T04:15Z	0.872	false
2021-03-01T04:00Z	0.874	false
2021-03-01T03:45Z	0.876	false
2021-03-01T03:30Z	0.877	false
2021-03-01T03:15Z	0.879	false
2021-03-01T03:00Z	0.88	false
2021-03-01T02:45Z	0.881	false
2021-03-01T02:30Z	0.883	false
2021-03-01T02:15Z	0.884	false
2021-03-01T02:00Z	0.885	false
2021-03-01T01:45Z	0.887	false
2021-03-01T01:30Z	0.887	false
2021-03-01T01:15Z	0.887	false
2021-03-01T01:00Z	0.888	false
2021-03-01T00:45Z	0.888	false
2021-03-01T00:30Z	0.888	false
2021-03-01T00:15Z	0.89	false
2021-03-01T00:00Z	0.891	false
2021-02-28T23:45Z	0.892	false
2021-02-28T23:30Z	0.892	false
2021-02-28T23:15Z	0.894	false
2021-02-28T23:00Z	0.892	false
2021-02-28T22:45Z	0.893	false
2021-02-28T22:30Z	0.893	false
2021-02-28T22:15Z	0.894	false
2021-02-28T22:00Z	0.894	false
2021-02-28T21:45Z	0.893	false
2021-02-28T21:30Z	0.893	false
2021-02-28T21:15Z	0.892	false
2021-02-28T21:00Z	0.891	false
2021-02-28T20:45Z	0.891	false
2021-02-28T20:30Z	0.892	false
2021-02-28T20:15Z	0.891	false
2021-02-28T20:00Z	0.891	false
2021-02-28T19:45Z	0.891	false
2021-02-28T19:30Z	0.891	false
2021-02-28T19:15Z	0.89	false
2021-02-28T19:00Z	0.891	false
2021-02-28T18:45Z	0.893	false
2021-02-28T18:30Z	0.893	false
2021-02-28T18:15Z	0.893	false
2021-02-28T18:00Z	0.893	false
2021-02-28T17:45Z	0.895	false
2021-02-28T17:30Z	0.894	false
2021-02-28T17:15Z	0.894	false
2021-02-28T17:00Z	0.896	false
2021-02-28T16:45Z	0.897	false
2021-02-28T16:30Z	0.897	false
2021-02-28T16:15Z	0.898	false
2021-02-28T16:00Z	0.898	false
2021-02-28T15:45Z	0.899	false
2021-02-28T15:30Z	0.899	false
2021-02-28T15:15Z	0.899	false
2021-02-28T15:00Z	0.899	false
2021-02-28T14:45Z	0.9	false
2021-02-28T14:30Z	0.899	false
2021-02-28T14:15Z	0.898	false
2021-02-28T14:00Z	0.896	false
2021-02-28T13:45Z	0.893	false
2021-02-28T13:30Z	0.891	false
2021-02-28T13:15Z	0.89	false
2021-02-28T13:00Z	0.888	false
2021-02-28T12:45Z	0.886	false
2021-02-28T12:30Z	0.885	false
2021-02-28T12:15Z	0.883	false
2021-02-28T12:00Z	0.881	false
2021-02-28T11:45Z	0.88	false
2021-02-28T11:30Z	0.877	false
2021-02-28T11:15Z	0.875	false
2021-02-28T11:00Z	0.874	false
2021-02-28T10:45Z	0.872	false
2021-02-28T10:30Z	0.871	false
2021-02-28T10:15Z	0.871	false
2021-02-28T10:00Z	0.869	false
2021-02-28T09:45Z	0.868	false
2021-02-28T09:30Z	0.867	false
2021-02-28T09:15Z	0.866	false
2021-02-28T09:00Z	0.865	false
2021-02-28T08:45Z	0.865	false
2021-02-28T08:30Z	0.866	false
2021-02-28T08:15Z	0.864	false
2021-02-28T08:00Z	0.864	false
2021-02-28T07:45Z	0.865	false
2021-02-28T07:30Z	0.865	false
2021-02-28T07:15Z	0.865	false
2021-02-28T07:00Z	0.866	false
2021-02-28T06:45Z	0.868	false
2021-02-28T06:30Z	0.867	false
2021-02-28T06:15Z	0.868	false
2021-02-28T06:00Z	0.868	false
2021-02-28T05:45Z	0.868	false
2021-02-28T05:30Z	0.868	false
2021-02-28T05:15Z	0.869	false
2021-02-28T05:00Z	0.87	false
2021-02-28T04:45Z	0.872	false
2021-02-28T04:30Z	0.872	false
2021-02-28T04:15Z	0.874	false
2021-02-28T04:00Z	0.876	false
2021-02-28T03:45Z	0.877	false
2021-02-28T03:30Z	0.878	false
2021-02-28T03:15Z	0.879	false
2021-02-28T03:00Z	0.88	false
2021-02-28T02:45Z	0.881	false
2021-02-28T02:30Z	0.883	false
2021-02-28T02:15Z	0.884	false
2021-02-28T02:00Z	0.884	false
2021-02-28T01:45Z	0.884	false
2021-02-28T01:30Z	0.884	false
2021-02-28T01:15Z	0.885	false
2021-02-28T01:00Z	0.886	false
2021-02-28T00:45Z	0.886	false
2021-02-28T00:30Z	0.888	false
2021-02-28T00:15Z	0.889	false
2021-02-28T00:00Z	0.89	false
2021-02-27T23:45Z	0.89	false
2021-02-27T23:30Z	0.891	false
2021-02-27T23:15Z	0.892	false
2021-02-27T23:00Z	0.893	false
2021-02-27T22:45Z	0.892	false
2021-02-27T22:30Z	0.892	false
2021-02-27T22:15Z	0.893	false
2021-02-27T22:00Z	0.892	false
2021-02-27T21:45Z	0.892	false
2021-02-27T21:30Z	0.893	false
2021-02-27T21:15Z	0.893	false
2021-02-27T21:00Z	0.893	false
2021-02-27T20:45Z	0.892	false
2021-02-27T20:30Z	0.893	false
2021-02-27T20:15Z	0.892	false
2021-02-27T20:00Z	0.892	false
2021-02-27T19:45Z	0.893	false
2021-02-27T19:30Z	0.894	false
2021-02-27T19:15Z	0.894	false
2021-02-27T19:00Z	0.895	false
2021-02-27T18:45Z	0.895	false
2021-02-27T18:30Z	0.894	false
2021-02-27T18:15Z	0.895	false
2021-02-27T18:00Z	0.895	false
2021-02-27T17:45Z	0.896	false
2021-02-27T17:30Z	0.895	false
2021-02-27T17:15Z	0.897	false
2021-02-27T17:00Z	0.898	false
2021-02-27T16:45Z	0.898	false
2021-02-27T16:30Z	0.899	false
2021-02-27T16:15Z	0.899	false
2021-02-27T16:00Z	0.9	false
2021-02-27T15:45Z	0.9	false
2021-02-27T15:30Z	0.9	false
2021-02-27T15:15Z	0.9	false
2021-02-27T15:00Z	0.9	false
2021-02-27T14:45Z	0.899	false
2021-02-27T14:30Z	0.898	false
2021-02-27T14:15Z	0.898	false
2021-02-27T14:00Z	0.897	false
2021-02-27T13:45Z	0.897	false
2021-02-27T13:30Z	0.894	false
2021-02-27T13:15Z	0.895	false
2021-02-27T13:00Z	0.893	false
2021-02-27T12:45Z	0.892	false
2021-02-27T12:30Z	0.89	false
2021-02-27T12:15Z	0.889	false
2021-02-27T12:00Z	0.887	false
2021-02-27T11:45Z	0.886	false
2021-02-27T11:30Z	0.883	false
2021-02-27T11:15Z	0.881	false
2021-02-27T11:00Z	0.879	false
2021-02-27T10:45Z	0.877	false
2021-02-27T10:30Z	0.875	false
2021-02-27T10:15Z	0.873	false
2021-02-27T10:00Z	0.873	false
2021-02-27T09:45Z	0.872	false
2021-02-27T09:30Z	0.872	false
2021-02-27T09:15Z	0.871	false
2021-02-27T09:00Z	0.87	false
2021-02-27T08:45Z	0.869	false
2021-02-27T08:30Z	0.87	false
2021-02-27T08:15Z	0.87	false
2021-02-27T08:00Z	0.869	false
2021-02-27T07:45Z	0.87	false
2021-02-27T07:30Z	0.868	false
2021-02-27T07:15Z	0.869	false
2021-02-27T07:00Z	0.868	false
2021-02-27T06:45Z	0.868	false
2021-02-27T06:30Z	0.868	false
2021-02-27T06:15Z	0.869	false
2021-02-27T06:00Z	0.869	false
2021-02-27T05:45Z	0.871	false
2021-02-27T05:30Z	0.872	false
2021-02-27T05:15Z	0.873	false
2021-02-27T05:00Z	0.874	false
2021-02-27T04:45Z	0.874	false
2021-02-27T04:30Z	0.877	false
2021-02-27T04:15Z	0.878	false
2021-02-27T04:00Z	0.88	false
2021-02-27T03:45Z	0.882	false
2021-02-27T03:30Z	0.882	false
2021-02-27T03:15Z	0.884	false
2021-02-27T03:00Z	0.883	false
2021-02-27T02:45Z	0.884	false
2021-02-27T02:30Z	0.885	false
2021-02-27T02:15Z	0.887	false
2021-02-27T02:00Z	0.887	false
2021-02-27T01:45Z	0.889	false
2021-02-27T01:30Z	0.889	false
2021-02-27T01:15Z	0.891	false
2021-02-27T01:00Z	0.89	false
2021-02-27T00:45Z	0.892	false
2021-02-27T00:30Z	0.893	false
2021-02-27T00:15Z	0.894	false
2021-02-27T00:00Z	0.895	false
2021-02-26T23:45Z	0.895	false
2021-02-26T23:30Z	0.895	false
2021-02-26T23:15Z	0.895	false
2021-02-26T23:00Z	0.894	false
2021-02-26T22:45Z	0.895	false
2021-02-26T22:30Z	0.894	false
2021-02-26T22:15Z	0.894	false
2021-02-26T22:00Z	0.896	false
2021-02-26T21:45Z	0.896	false
2021-02-26T21:30Z	0.895	false
2021-02-26T21:15Z	0.894	false
2021-02-26T21:00Z	0.895	false
2021-02-26T20:45Z	0.895	false
2021-02-26T20:30Z	0.896	false
2021-02-26T20:15Z	0.895	false
2021-02-26T20:00Z	0.895	false
2021-02-26T19:45Z	0.895	false
2021-02-26T19:30Z	0.895	false
2021-02-26T19:15Z	0.895	false
2021-02-26T19:00Z	0.893	false
2021-02-26T18:45Z	0.895	false
2021-02-26T18:30Z	0.895	false
2021-02-26T18:15Z	0.895	false
2021-02-26T18:00Z	0.895	false
2021-02-26T17:45Z	0.897	false
2021-02-26T17:30Z	0.899	false
2021-02-26T17:15Z	0.898	false
2021-02-26T17:00Z	0.9	false
2021-02-26T16:45Z	0.901	false
2021-02-26T16:30Z	0.901	false
2021-02-26T16:15Z	0.902	false
2021-02-26T16:00Z	0.901	false
2021-02-26T15:45Z	0.901	false
2021-02-26T15:30Z	0.901	false
2021-02-26T15:15Z	0.901	false
2021-02-26T15:00Z	0.899	false
2021-02-26T14:45Z	0.899	false
2021-02-26T14:30Z	0.9	false
2021-02-26T14:15Z	0.9	false
2021-02-26T14:00Z	0.897	false
2021-02-26T13:45Z	0.897	false
2021-02-26T13:30Z	0.897	false
2021-02-26T13:15Z	0.897	false
2021-02-26T13:00Z	0.896	false
2021-02-26T12:45Z	0.896	false
2021-02-26T12:30Z	0.896	false
2021-02-26T12:15Z	0.894	false
2021-02-26T12:00Z	0.893	false
2021-02-26T11:45Z	0.892	false
2021-02-26T11:30Z	0.889	false
2021-02-26T11:15Z	0.889	false
2021-02-26T11:00Z	0.886	false
2021-02-26T10:45Z	0.884	false
2021-02-26T10:30Z	0.882	false
2021-02-26T10:15Z	0.88	false
2021-02-26T10:00Z	0.88	false
2021-02-26T09:45Z	0.878	false
2021-02-26T09:30Z	0.877	false
2021-02-26T09:15Z	0.876	false
2021-02-26T09:00Z	0.876	false
2021-02-26T08:45Z	0.873	false
2021-02-26T08:30Z	0.873	false
2021-02-26T08:15Z	0.873	false
2021-02-26T08:00Z	0.872	false
2021-02-26T07:45Z	0.871	false
2021-02-26T07:30Z	0.871	false
2021-02-26T07:15Z	0.87	false
2021-02-26T07:00Z	0.871	false
2021-02-26T06:45Z	0.872	false
2021-02-26T06:30Z	0.871	false
2021-02-26T06:15Z	0.872	false
2021-02-26T06:00Z	0.873	false
2021-02-26T05:45Z	0.875	false
2021-02-26T05:30Z	0.876	false
2021-02-26T05:15Z	0.877	false
2021-02-26T05:00Z	0.877	false
2021-02-26T04:45Z	0.879	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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