River level River Lee at Harpenden

Check for flood warnings in this area

Latest recorded level 0.82m at 4:30am Tuesday 22 January 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
2019-01-22T04:30Z	0.821	false
2019-01-22T04:15Z	0.816	false
2019-01-22T04:00Z	0.811	false
2019-01-22T03:45Z	0.81	false
2019-01-22T03:30Z	0.81	false
2019-01-22T03:15Z	0.811	false
2019-01-22T03:00Z	0.813	false
2019-01-22T02:45Z	0.815	false
2019-01-22T02:30Z	0.816	false
2019-01-22T02:15Z	0.818	false
2019-01-22T02:00Z	0.82	false
2019-01-22T01:45Z	0.821	false
2019-01-22T01:30Z	0.822	false
2019-01-22T01:15Z	0.823	false
2019-01-22T01:00Z	0.824	false
2019-01-22T00:45Z	0.825	false
2019-01-22T00:30Z	0.825	false
2019-01-22T00:15Z	0.826	false
2019-01-22T00:00Z	0.826	false
2019-01-21T23:45Z	0.826	false
2019-01-21T23:30Z	0.826	false
2019-01-21T23:15Z	0.826	false
2019-01-21T23:00Z	0.826	false
2019-01-21T22:45Z	0.825	false
2019-01-21T22:30Z	0.824	false
2019-01-21T22:15Z	0.824	false
2019-01-21T22:00Z	0.823	false
2019-01-21T21:45Z	0.822	false
2019-01-21T21:30Z	0.821	false
2019-01-21T21:15Z	0.82	false
2019-01-21T21:00Z	0.819	false
2019-01-21T20:45Z	0.818	false
2019-01-21T20:30Z	0.818	false
2019-01-21T20:15Z	0.817	false
2019-01-21T20:00Z	0.817	false
2019-01-21T19:45Z	0.816	false
2019-01-21T19:30Z	0.816	false
2019-01-21T19:15Z	0.816	false
2019-01-21T19:00Z	0.817	false
2019-01-21T18:45Z	0.817	false
2019-01-21T18:30Z	0.817	false
2019-01-21T18:15Z	0.818	false
2019-01-21T18:00Z	0.819	false
2019-01-21T17:45Z	0.82	false
2019-01-21T17:30Z	0.82	false
2019-01-21T17:15Z	0.821	false
2019-01-21T17:00Z	0.822	false
2019-01-21T16:45Z	0.822	false
2019-01-21T16:30Z	0.822	false
2019-01-21T16:15Z	0.823	false
2019-01-21T16:00Z	0.822	false
2019-01-21T15:45Z	0.823	false
2019-01-21T15:30Z	0.824	false
2019-01-21T15:15Z	0.824	false
2019-01-21T15:00Z	0.824	false
2019-01-21T14:45Z	0.823	false
2019-01-21T14:30Z	0.823	false
2019-01-21T14:15Z	0.823	false
2019-01-21T14:00Z	0.822	false
2019-01-21T13:45Z	0.822	false
2019-01-21T13:30Z	0.821	false
2019-01-21T13:15Z	0.82	false
2019-01-21T13:00Z	0.819	false
2019-01-21T12:45Z	0.818	false
2019-01-21T12:30Z	0.815	false
2019-01-21T12:15Z	0.813	false
2019-01-21T12:00Z	0.809	false
2019-01-21T11:45Z	0.804	false
2019-01-21T11:30Z	0.798	false
2019-01-21T11:15Z	0.792	false
2019-01-21T11:00Z	0.785	false
2019-01-21T10:45Z	0.779	false
2019-01-21T10:30Z	0.773	false
2019-01-21T10:15Z	0.768	false
2019-01-21T10:00Z	0.765	false
2019-01-21T09:45Z	0.762	false
2019-01-21T09:30Z	0.762	false
2019-01-21T09:15Z	0.761	false
2019-01-21T09:00Z	0.762	false
2019-01-21T08:45Z	0.763	false
2019-01-21T08:30Z	0.764	false
2019-01-21T08:15Z	0.765	false
2019-01-21T08:00Z	0.766	false
2019-01-21T07:45Z	0.768	false
2019-01-21T07:30Z	0.77	false
2019-01-21T07:15Z	0.771	false
2019-01-21T07:00Z	0.773	false
2019-01-21T06:45Z	0.775	false
2019-01-21T06:30Z	0.778	false
2019-01-21T06:15Z	0.78	false
2019-01-21T06:00Z	0.782	false
2019-01-21T05:45Z	0.785	false
2019-01-21T05:30Z	0.788	false
2019-01-21T05:15Z	0.791	false
2019-01-21T05:00Z	0.794	false
2019-01-21T04:45Z	0.796	false
2019-01-21T04:30Z	0.799	false
2019-01-21T04:15Z	0.801	false
2019-01-21T04:00Z	0.803	false
2019-01-21T03:45Z	0.806	false
2019-01-21T03:30Z	0.807	false
2019-01-21T03:15Z	0.809	false
2019-01-21T03:00Z	0.811	false
2019-01-21T02:45Z	0.813	false
2019-01-21T02:30Z	0.815	false
2019-01-21T02:15Z	0.817	false
2019-01-21T02:00Z	0.819	false
2019-01-21T01:45Z	0.82	false
2019-01-21T01:30Z	0.822	false
2019-01-21T01:15Z	0.824	false
2019-01-21T01:00Z	0.825	false
2019-01-21T00:45Z	0.826	false
2019-01-21T00:30Z	0.827	false
2019-01-21T00:15Z	0.828	false
2019-01-21T00:00Z	0.829	false
2019-01-20T23:45Z	0.829	false
2019-01-20T23:30Z	0.829	false
2019-01-20T23:15Z	0.829	false
2019-01-20T23:00Z	0.829	false
2019-01-20T22:45Z	0.828	false
2019-01-20T22:30Z	0.828	false
2019-01-20T22:15Z	0.828	false
2019-01-20T22:00Z	0.828	false
2019-01-20T21:45Z	0.827	false
2019-01-20T21:30Z	0.827	false
2019-01-20T21:15Z	0.827	false
2019-01-20T21:00Z	0.827	false
2019-01-20T20:45Z	0.827	false
2019-01-20T20:30Z	0.826	false
2019-01-20T20:15Z	0.826	false
2019-01-20T20:00Z	0.826	false
2019-01-20T19:45Z	0.826	false
2019-01-20T19:30Z	0.827	false
2019-01-20T19:15Z	0.828	false
2019-01-20T19:00Z	0.829	false
2019-01-20T18:45Z	0.83	false
2019-01-20T18:30Z	0.831	false
2019-01-20T18:15Z	0.832	false
2019-01-20T18:00Z	0.833	false
2019-01-20T17:45Z	0.834	false
2019-01-20T17:30Z	0.834	false
2019-01-20T17:15Z	0.836	false
2019-01-20T17:00Z	0.836	false
2019-01-20T16:45Z	0.837	false
2019-01-20T16:30Z	0.838	false
2019-01-20T16:15Z	0.837	false
2019-01-20T16:00Z	0.837	false
2019-01-20T15:45Z	0.837	false
2019-01-20T15:30Z	0.836	false
2019-01-20T15:15Z	0.834	false
2019-01-20T15:00Z	0.832	false
2019-01-20T14:45Z	0.83	false
2019-01-20T14:30Z	0.826	false
2019-01-20T14:15Z	0.822	false
2019-01-20T14:00Z	0.817	false
2019-01-20T13:45Z	0.811	false
2019-01-20T13:30Z	0.805	false
2019-01-20T13:15Z	0.799	false
2019-01-20T13:00Z	0.793	false
2019-01-20T12:45Z	0.787	false
2019-01-20T12:30Z	0.781	false
2019-01-20T12:15Z	0.776	false
2019-01-20T12:00Z	0.771	false
2019-01-20T11:45Z	0.768	false
2019-01-20T11:30Z	0.765	false
2019-01-20T11:15Z	0.762	false
2019-01-20T11:00Z	0.761	false
2019-01-20T10:45Z	0.76	false
2019-01-20T10:30Z	0.759	false
2019-01-20T10:15Z	0.759	false
2019-01-20T10:00Z	0.759	false
2019-01-20T09:45Z	0.76	false
2019-01-20T09:30Z	0.761	false
2019-01-20T09:15Z	0.762	false
2019-01-20T09:00Z	0.763	false
2019-01-20T08:45Z	0.764	false
2019-01-20T08:30Z	0.765	false
2019-01-20T08:15Z	0.767	false
2019-01-20T08:00Z	0.768	false
2019-01-20T07:45Z	0.77	false
2019-01-20T07:30Z	0.771	false
2019-01-20T07:15Z	0.773	false
2019-01-20T07:00Z	0.775	false
2019-01-20T06:45Z	0.777	false
2019-01-20T06:30Z	0.779	false
2019-01-20T06:15Z	0.781	false
2019-01-20T06:00Z	0.783	false
2019-01-20T05:45Z	0.785	false
2019-01-20T05:30Z	0.788	false
2019-01-20T05:15Z	0.789	false
2019-01-20T05:00Z	0.792	false
2019-01-20T04:45Z	0.794	false
2019-01-20T04:30Z	0.796	false
2019-01-20T04:15Z	0.798	false
2019-01-20T04:00Z	0.799	false
2019-01-20T03:45Z	0.801	false
2019-01-20T03:30Z	0.803	false
2019-01-20T03:15Z	0.804	false
2019-01-20T03:00Z	0.805	false
2019-01-20T02:45Z	0.806	false
2019-01-20T02:30Z	0.808	false
2019-01-20T02:15Z	0.809	false
2019-01-20T02:00Z	0.81	false
2019-01-20T01:45Z	0.811	false
2019-01-20T01:30Z	0.811	false
2019-01-20T01:15Z	0.812	false
2019-01-20T01:00Z	0.813	false
2019-01-20T00:45Z	0.814	false
2019-01-20T00:30Z	0.815	false
2019-01-20T00:15Z	0.815	false
2019-01-20T00:00Z	0.815	false
2019-01-19T23:45Z	0.816	false
2019-01-19T23:30Z	0.816	false
2019-01-19T23:15Z	0.816	false
2019-01-19T23:00Z	0.816	false
2019-01-19T22:45Z	0.816	false
2019-01-19T22:30Z	0.817	false
2019-01-19T22:15Z	0.817	false
2019-01-19T22:00Z	0.817	false
2019-01-19T21:45Z	0.818	false
2019-01-19T21:30Z	0.818	false
2019-01-19T21:15Z	0.819	false
2019-01-19T21:00Z	0.819	false
2019-01-19T20:45Z	0.819	false
2019-01-19T20:30Z	0.82	false
2019-01-19T20:15Z	0.82	false
2019-01-19T20:00Z	0.82	false
2019-01-19T19:45Z	0.821	false
2019-01-19T19:30Z	0.822	false
2019-01-19T19:15Z	0.822	false
2019-01-19T19:00Z	0.823	false
2019-01-19T18:45Z	0.824	false
2019-01-19T18:30Z	0.825	false
2019-01-19T18:15Z	0.826	false
2019-01-19T18:00Z	0.828	false
2019-01-19T17:45Z	0.829	false
2019-01-19T17:30Z	0.83	false
2019-01-19T17:15Z	0.831	false
2019-01-19T17:00Z	0.832	false
2019-01-19T16:45Z	0.833	false
2019-01-19T16:30Z	0.833	false
2019-01-19T16:15Z	0.833	false
2019-01-19T16:00Z	0.833	false
2019-01-19T15:45Z	0.832	false
2019-01-19T15:30Z	0.831	false
2019-01-19T15:15Z	0.831	false
2019-01-19T15:00Z	0.829	false
2019-01-19T14:45Z	0.827	false
2019-01-19T14:30Z	0.824	false
2019-01-19T14:15Z	0.821	false
2019-01-19T14:00Z	0.817	false
2019-01-19T13:45Z	0.812	false
2019-01-19T13:30Z	0.807	false
2019-01-19T13:15Z	0.802	false
2019-01-19T13:00Z	0.796	false
2019-01-19T12:45Z	0.79	false
2019-01-19T12:30Z	0.784	false
2019-01-19T12:15Z	0.779	false
2019-01-19T12:00Z	0.773	false
2019-01-19T11:45Z	0.77	false
2019-01-19T11:30Z	0.767	false
2019-01-19T11:15Z	0.764	false
2019-01-19T11:00Z	0.762	false
2019-01-19T10:45Z	0.761	false
2019-01-19T10:30Z	0.761	false
2019-01-19T10:15Z	0.76	false
2019-01-19T10:00Z	0.761	false
2019-01-19T09:45Z	0.761	false
2019-01-19T09:30Z	0.761	false
2019-01-19T09:15Z	0.762	false
2019-01-19T09:00Z	0.763	false
2019-01-19T08:45Z	0.764	false
2019-01-19T08:30Z	0.766	false
2019-01-19T08:15Z	0.767	false
2019-01-19T08:00Z	0.768	false
2019-01-19T07:45Z	0.77	false
2019-01-19T07:30Z	0.772	false
2019-01-19T07:15Z	0.774	false
2019-01-19T07:00Z	0.776	false
2019-01-19T06:45Z	0.778	false
2019-01-19T06:30Z	0.78	false
2019-01-19T06:15Z	0.782	false
2019-01-19T06:00Z	0.785	false
2019-01-19T05:45Z	0.787	false
2019-01-19T05:30Z	0.789	false
2019-01-19T05:15Z	0.792	false
2019-01-19T05:00Z	0.794	false
2019-01-19T04:45Z	0.797	false
2019-01-19T04:30Z	0.799	false
2019-01-19T04:15Z	0.801	false
2019-01-19T04:00Z	0.803	false
2019-01-19T03:45Z	0.805	false
2019-01-19T03:30Z	0.807	false
2019-01-19T03:15Z	0.809	false
2019-01-19T03:00Z	0.81	false
2019-01-19T02:45Z	0.812	false
2019-01-19T02:30Z	0.813	false
2019-01-19T02:15Z	0.814	false
2019-01-19T02:00Z	0.816	false
2019-01-19T01:45Z	0.816	false
2019-01-19T01:30Z	0.818	false
2019-01-19T01:15Z	0.819	false
2019-01-19T01:00Z	0.819	false
2019-01-19T00:45Z	0.82	false
2019-01-19T00:30Z	0.821	false
2019-01-19T00:15Z	0.822	false
2019-01-19T00:00Z	0.822	false
2019-01-18T23:45Z	0.822	false
2019-01-18T23:30Z	0.823	false
2019-01-18T23:15Z	0.823	false
2019-01-18T23:00Z	0.822	false
2019-01-18T22:45Z	0.822	false
2019-01-18T22:30Z	0.821	false
2019-01-18T22:15Z	0.821	false
2019-01-18T22:00Z	0.821	false
2019-01-18T21:45Z	0.819	false
2019-01-18T21:30Z	0.819	false
2019-01-18T21:15Z	0.818	false
2019-01-18T21:00Z	0.818	false
2019-01-18T20:45Z	0.817	false
2019-01-18T20:30Z	0.817	false
2019-01-18T20:15Z	0.816	false
2019-01-18T20:00Z	0.816	false
2019-01-18T19:45Z	0.816	false
2019-01-18T19:30Z	0.816	false
2019-01-18T19:15Z	0.816	false
2019-01-18T19:00Z	0.816	false
2019-01-18T18:45Z	0.817	false
2019-01-18T18:30Z	0.818	false
2019-01-18T18:15Z	0.82	false
2019-01-18T18:00Z	0.821	false
2019-01-18T17:45Z	0.822	false
2019-01-18T17:30Z	0.823	false
2019-01-18T17:15Z	0.823	false
2019-01-18T17:00Z	0.824	false
2019-01-18T16:45Z	0.825	false
2019-01-18T16:30Z	0.825	false
2019-01-18T16:15Z	0.825	false
2019-01-18T16:00Z	0.825	false
2019-01-18T15:45Z	0.824	false
2019-01-18T15:30Z	0.824	false
2019-01-18T15:15Z	0.823	false
2019-01-18T15:00Z	0.823	false
2019-01-18T14:45Z	0.822	false
2019-01-18T14:30Z	0.821	false
2019-01-18T14:15Z	0.821	false
2019-01-18T14:00Z	0.821	false
2019-01-18T13:45Z	0.821	false
2019-01-18T13:30Z	0.82	false
2019-01-18T13:15Z	0.819	false
2019-01-18T13:00Z	0.819	false
2019-01-18T12:45Z	0.817	false
2019-01-18T12:30Z	0.815	false
2019-01-18T12:15Z	0.811	false
2019-01-18T12:00Z	0.807	false
2019-01-18T11:45Z	0.802	false
2019-01-18T11:30Z	0.795	false
2019-01-18T11:15Z	0.788	false
2019-01-18T11:00Z	0.781	false
2019-01-18T10:45Z	0.774	false
2019-01-18T10:30Z	0.769	false
2019-01-18T10:15Z	0.766	false
2019-01-18T10:00Z	0.763	false
2019-01-18T09:45Z	0.761	false
2019-01-18T09:30Z	0.76	false
2019-01-18T09:15Z	0.76	false
2019-01-18T09:00Z	0.761	false
2019-01-18T08:45Z	0.761	false
2019-01-18T08:30Z	0.762	false
2019-01-18T08:15Z	0.764	false
2019-01-18T08:00Z	0.766	false
2019-01-18T07:45Z	0.768	false
2019-01-18T07:30Z	0.77	false
2019-01-18T07:15Z	0.772	false
2019-01-18T07:00Z	0.774	false
2019-01-18T06:45Z	0.777	false
2019-01-18T06:30Z	0.778	false
2019-01-18T06:15Z	0.781	false
2019-01-18T06:00Z	0.783	false
2019-01-18T05:45Z	0.785	false
2019-01-18T05:30Z	0.788	false
2019-01-18T05:15Z	0.79	false
2019-01-18T05:00Z	0.792	false
2019-01-18T04:45Z	0.795	false
2019-01-18T04:30Z	0.797	false
2019-01-18T04:15Z	0.799	false
2019-01-18T04:00Z	0.802	false
2019-01-18T03:45Z	0.804	false
2019-01-18T03:30Z	0.806	false
2019-01-18T03:15Z	0.808	false
2019-01-18T03:00Z	0.81	false
2019-01-18T02:45Z	0.813	false
2019-01-18T02:30Z	0.814	false
2019-01-18T02:15Z	0.816	false
2019-01-18T02:00Z	0.818	false
2019-01-18T01:45Z	0.819	false
2019-01-18T01:30Z	0.821	false
2019-01-18T01:15Z	0.822	false
2019-01-18T01:00Z	0.823	false
2019-01-18T00:45Z	0.824	false
2019-01-18T00:30Z	0.825	false
2019-01-18T00:15Z	0.825	false
2019-01-18T00:00Z	0.824	false
2019-01-17T23:45Z	0.823	false
2019-01-17T23:30Z	0.823	false
2019-01-17T23:15Z	0.821	false
2019-01-17T23:00Z	0.821	false
2019-01-17T22:45Z	0.82	false
2019-01-17T22:30Z	0.82	false
2019-01-17T22:15Z	0.819	false
2019-01-17T22:00Z	0.818	false
2019-01-17T21:45Z	0.817	false
2019-01-17T21:30Z	0.817	false
2019-01-17T21:15Z	0.816	false
2019-01-17T21:00Z	0.816	false
2019-01-17T20:45Z	0.815	false
2019-01-17T20:30Z	0.814	false
2019-01-17T20:15Z	0.813	false
2019-01-17T20:00Z	0.813	false
2019-01-17T19:45Z	0.812	false
2019-01-17T19:30Z	0.812	false
2019-01-17T19:15Z	0.812	false
2019-01-17T19:00Z	0.812	false
2019-01-17T18:45Z	0.812	false
2019-01-17T18:30Z	0.812	false
2019-01-17T18:15Z	0.813	false
2019-01-17T18:00Z	0.813	false
2019-01-17T17:45Z	0.814	false
2019-01-17T17:30Z	0.815	false
2019-01-17T17:15Z	0.815	false
2019-01-17T17:00Z	0.816	false
2019-01-17T16:45Z	0.816	false
2019-01-17T16:30Z	0.817	false
2019-01-17T16:15Z	0.817	false
2019-01-17T16:00Z	0.816	false
2019-01-17T15:45Z	0.817	false
2019-01-17T15:30Z	0.817	false
2019-01-17T15:15Z	0.817	false
2019-01-17T15:00Z	0.818	false
2019-01-17T14:45Z	0.818	false
2019-01-17T14:30Z	0.818	false
2019-01-17T14:15Z	0.818	false
2019-01-17T14:00Z	0.817	false
2019-01-17T13:45Z	0.817	false
2019-01-17T13:30Z	0.817	false
2019-01-17T13:15Z	0.816	false
2019-01-17T13:00Z	0.821	false
2019-01-17T12:45Z	0.815	false
2019-01-17T12:30Z	0.814	false
2019-01-17T12:15Z	0.811	false
2019-01-17T12:00Z	0.807	false
2019-01-17T11:45Z	0.802	false
2019-01-17T11:30Z	0.797	false
2019-01-17T11:15Z	0.791	false
2019-01-17T11:00Z	0.786	false
2019-01-17T10:45Z	0.779	false
2019-01-17T10:30Z	0.774	false
2019-01-17T10:15Z	0.77	false
2019-01-17T10:00Z	0.768	false
2019-01-17T09:45Z	0.766	false
2019-01-17T09:30Z	0.766	false
2019-01-17T09:15Z	0.766	false
2019-01-17T09:00Z	0.768	false
2019-01-17T08:45Z	0.769	false
2019-01-17T08:30Z	0.771	false
2019-01-17T08:15Z	0.773	false
2019-01-17T08:00Z	0.775	false
2019-01-17T07:45Z	0.776	false
2019-01-17T07:30Z	0.78	false
2019-01-17T07:15Z	0.782	false
2019-01-17T07:00Z	0.784	false
2019-01-17T06:45Z	0.786	false
2019-01-17T06:30Z	0.788	false
2019-01-17T06:15Z	0.79	false
2019-01-17T06:00Z	0.791	false
2019-01-17T05:45Z	0.792	false
2019-01-17T05:30Z	0.793	false
2019-01-17T05:15Z	0.793	false
2019-01-17T05:00Z	0.794	false
2019-01-17T04:45Z	0.795	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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