River level River Lee at Harpenden

Check for flood warnings in this area

Latest recorded level 0.82m at 5:30am Saturday 4 April 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
• Show highest recorded level

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Observed data

DateTime	Value	Error
2020-04-04T04:30Z	0.824	false
2020-04-04T04:15Z	0.826	false
2020-04-04T04:00Z	0.826	false
2020-04-04T03:45Z	0.828	false
2020-04-04T03:30Z	0.829	false
2020-04-04T03:15Z	0.831	false
2020-04-04T03:00Z	0.833	false
2020-04-04T02:45Z	0.835	false
2020-04-04T02:30Z	0.836	false
2020-04-04T02:15Z	0.838	false
2020-04-04T02:00Z	0.839	false
2020-04-04T01:45Z	0.842	false
2020-04-04T01:30Z	0.842	false
2020-04-04T01:15Z	0.845	false
2020-04-04T01:00Z	0.846	false
2020-04-04T00:45Z	0.848	false
2020-04-04T00:30Z	0.849	false
2020-04-04T00:15Z	0.852	false
2020-04-04T00:00Z	0.854	false
2020-04-03T23:45Z	0.854	false
2020-04-03T23:30Z	0.854	false
2020-04-03T23:15Z	0.854	false
2020-04-03T23:00Z	0.854	false
2020-04-03T22:45Z	0.855	false
2020-04-03T22:30Z	0.855	false
2020-04-03T22:15Z	0.856	false
2020-04-03T22:00Z	0.855	false
2020-04-03T21:45Z	0.855	false
2020-04-03T21:30Z	0.855	false
2020-04-03T21:15Z	0.855	false
2020-04-03T21:00Z	0.855	false
2020-04-03T20:45Z	0.855	false
2020-04-03T20:30Z	0.856	false
2020-04-03T20:15Z	0.855	false
2020-04-03T20:00Z	0.855	false
2020-04-03T19:45Z	0.855	false
2020-04-03T19:30Z	0.855	false
2020-04-03T19:15Z	0.855	false
2020-04-03T19:00Z	0.856	false
2020-04-03T18:45Z	0.858	false
2020-04-03T18:30Z	0.859	false
2020-04-03T18:15Z	0.859	false
2020-04-03T18:00Z	0.86	false
2020-04-03T17:45Z	0.862	false
2020-04-03T17:30Z	0.861	false
2020-04-03T17:15Z	0.861	false
2020-04-03T17:00Z	0.861	false
2020-04-03T16:45Z	0.862	false
2020-04-03T16:30Z	0.862	false
2020-04-03T16:15Z	0.862	false
2020-04-03T16:00Z	0.863	false
2020-04-03T15:45Z	0.862	false
2020-04-03T15:30Z	0.861	false
2020-04-03T15:15Z	0.86	false
2020-04-03T15:00Z	0.859	false
2020-04-03T14:45Z	0.858	false
2020-04-03T14:30Z	0.856	false
2020-04-03T14:15Z	0.856	false
2020-04-03T14:00Z	0.855	false
2020-04-03T13:45Z	0.854	false
2020-04-03T13:30Z	0.852	false
2020-04-03T13:15Z	0.854	false
2020-04-03T13:00Z	0.853	false
2020-04-03T12:45Z	0.852	false
2020-04-03T12:30Z	0.851	false
2020-04-03T12:15Z	0.849	false
2020-04-03T12:00Z	0.847	false
2020-04-03T11:45Z	0.844	false
2020-04-03T11:30Z	0.842	false
2020-04-03T11:15Z	0.839	false
2020-04-03T11:00Z	0.836	false
2020-04-03T10:45Z	0.835	false
2020-04-03T10:30Z	0.833	false
2020-04-03T10:15Z	0.831	false
2020-04-03T10:00Z	0.83	false
2020-04-03T09:45Z	0.83	false
2020-04-03T09:30Z	0.829	false
2020-04-03T09:15Z	0.829	false
2020-04-03T09:00Z	0.829	false
2020-04-03T08:45Z	0.829	false
2020-04-03T08:30Z	0.828	false
2020-04-03T08:15Z	0.827	false
2020-04-03T08:00Z	0.826	false
2020-04-03T07:45Z	0.825	false
2020-04-03T07:30Z	0.823	false
2020-04-03T07:15Z	0.822	false
2020-04-03T07:00Z	0.821	false
2020-04-03T06:45Z	0.821	false
2020-04-03T06:30Z	0.82	false
2020-04-03T06:15Z	0.82	false
2020-04-03T06:00Z	0.82	false
2020-04-03T05:45Z	0.82	false
2020-04-03T05:30Z	0.821	false
2020-04-03T05:15Z	0.822	false
2020-04-03T05:00Z	0.823	false
2020-04-03T04:45Z	0.825	false
2020-04-03T04:30Z	0.826	false
2020-04-03T04:15Z	0.827	false
2020-04-03T04:00Z	0.829	false
2020-04-03T03:45Z	0.83	false
2020-04-03T03:30Z	0.832	false
2020-04-03T03:15Z	0.833	false
2020-04-03T03:00Z	0.835	false
2020-04-03T02:45Z	0.837	false
2020-04-03T02:30Z	0.838	false
2020-04-03T02:15Z	0.84	false
2020-04-03T02:00Z	0.843	false
2020-04-03T01:45Z	0.845	false
2020-04-03T01:30Z	0.845	false
2020-04-03T01:15Z	0.848	false
2020-04-03T01:00Z	0.85	false
2020-04-03T00:45Z	0.852	false
2020-04-03T00:30Z	0.851	false
2020-04-03T00:15Z	0.853	false
2020-04-03T00:00Z	0.853	false
2020-04-02T23:45Z	0.853	false
2020-04-02T23:30Z	0.854	false
2020-04-02T23:15Z	0.855	false
2020-04-02T23:00Z	0.856	false
2020-04-02T22:45Z	0.858	false
2020-04-02T22:30Z	0.858	false
2020-04-02T22:15Z	0.858	false
2020-04-02T22:00Z	0.858	false
2020-04-02T21:45Z	0.858	false
2020-04-02T21:30Z	0.858	false
2020-04-02T21:15Z	0.857	false
2020-04-02T21:00Z	0.857	false
2020-04-02T20:45Z	0.857	false
2020-04-02T20:30Z	0.857	false
2020-04-02T20:15Z	0.857	false
2020-04-02T20:00Z	0.857	false
2020-04-02T19:45Z	0.857	false
2020-04-02T19:30Z	0.857	false
2020-04-02T19:15Z	0.859	false
2020-04-02T19:00Z	0.859	false
2020-04-02T18:45Z	0.86	false
2020-04-02T18:30Z	0.86	false
2020-04-02T18:15Z	0.86	false
2020-04-02T18:00Z	0.859	false
2020-04-02T17:45Z	0.86	false
2020-04-02T17:30Z	0.86	false
2020-04-02T17:15Z	0.861	false
2020-04-02T17:00Z	0.86	false
2020-04-02T16:45Z	0.862	false
2020-04-02T16:30Z	0.861	false
2020-04-02T16:15Z	0.863	false
2020-04-02T16:00Z	0.862	false
2020-04-02T15:45Z	0.863	false
2020-04-02T15:30Z	0.862	false
2020-04-02T15:15Z	0.863	false
2020-04-02T15:00Z	0.861	false
2020-04-02T14:45Z	0.862	false
2020-04-02T14:30Z	0.861	false
2020-04-02T14:15Z	0.862	false
2020-04-02T14:00Z	0.859	false
2020-04-02T13:45Z	0.86	false
2020-04-02T13:30Z	0.858	false
2020-04-02T13:15Z	0.858	false
2020-04-02T13:00Z	0.857	false
2020-04-02T12:45Z	0.856	false
2020-04-02T12:30Z	0.854	false
2020-04-02T12:15Z	0.852	false
2020-04-02T12:00Z	0.849	false
2020-04-02T11:45Z	0.847	false
2020-04-02T11:30Z	0.845	false
2020-04-02T11:15Z	0.844	false
2020-04-02T11:00Z	0.841	false
2020-04-02T10:45Z	0.838	false
2020-04-02T10:30Z	0.834	false
2020-04-02T10:15Z	0.833	false
2020-04-02T10:00Z	0.831	false
2020-04-02T09:45Z	0.829	false
2020-04-02T09:30Z	0.827	false
2020-04-02T09:15Z	0.828	false
2020-04-02T09:00Z	0.826	false
2020-04-02T08:45Z	0.825	false
2020-04-02T08:30Z	0.825	false
2020-04-02T08:15Z	0.824	false
2020-04-02T08:00Z	0.824	false
2020-04-02T07:45Z	0.824	false
2020-04-02T07:30Z	0.823	false
2020-04-02T07:15Z	0.824	false
2020-04-02T07:00Z	0.823	false
2020-04-02T06:45Z	0.823	false
2020-04-02T06:30Z	0.822	false
2020-04-02T06:15Z	0.822	false
2020-04-02T06:00Z	0.822	false
2020-04-02T05:45Z	0.823	false
2020-04-02T05:30Z	0.824	false
2020-04-02T05:15Z	0.825	false
2020-04-02T05:00Z	0.826	false
2020-04-02T04:45Z	0.827	false
2020-04-02T04:30Z	0.829	false
2020-04-02T04:15Z	0.83	false
2020-04-02T04:00Z	0.831	false
2020-04-02T03:45Z	0.832	false
2020-04-02T03:30Z	0.834	false
2020-04-02T03:15Z	0.835	false
2020-04-02T03:00Z	0.836	false
2020-04-02T02:45Z	0.839	false
2020-04-02T02:30Z	0.841	false
2020-04-02T02:15Z	0.843	false
2020-04-02T02:00Z	0.845	false
2020-04-02T01:45Z	0.847	false
2020-04-02T01:30Z	0.848	false
2020-04-02T01:15Z	0.85	false
2020-04-02T01:00Z	0.851	false
2020-04-02T00:45Z	0.852	false
2020-04-02T00:30Z	0.853	false
2020-04-02T00:15Z	0.854	false
2020-04-02T00:00Z	0.854	false
2020-04-01T23:45Z	0.855	false
2020-04-01T23:30Z	0.856	false
2020-04-01T23:15Z	0.857	false
2020-04-01T23:00Z	0.858	false
2020-04-01T22:45Z	0.859	false
2020-04-01T22:30Z	0.86	false
2020-04-01T22:15Z	0.86	false
2020-04-01T22:00Z	0.859	false
2020-04-01T21:45Z	0.86	false
2020-04-01T21:30Z	0.86	false
2020-04-01T21:15Z	0.86	false
2020-04-01T21:00Z	0.86	false
2020-04-01T20:45Z	0.86	false
2020-04-01T20:30Z	0.861	false
2020-04-01T20:15Z	0.861	false
2020-04-01T20:00Z	0.861	false
2020-04-01T19:45Z	0.861	false
2020-04-01T19:30Z	0.861	false
2020-04-01T19:15Z	0.861	false
2020-04-01T19:00Z	0.86	false
2020-04-01T18:45Z	0.86	false
2020-04-01T18:30Z	0.86	false
2020-04-01T18:15Z	0.86	false
2020-04-01T18:00Z	0.86	false
2020-04-01T17:45Z	0.861	false
2020-04-01T17:30Z	0.862	false
2020-04-01T17:15Z	0.862	false
2020-04-01T17:00Z	0.864	false
2020-04-01T16:45Z	0.863	false
2020-04-01T16:30Z	0.864	false
2020-04-01T16:15Z	0.864	false
2020-04-01T16:00Z	0.864	false
2020-04-01T15:45Z	0.865	false
2020-04-01T15:30Z	0.864	false
2020-04-01T15:15Z	0.864	false
2020-04-01T15:00Z	0.864	false
2020-04-01T14:45Z	0.864	false
2020-04-01T14:30Z	0.863	false
2020-04-01T14:15Z	0.864	false
2020-04-01T14:00Z	0.863	false
2020-04-01T13:45Z	0.863	false
2020-04-01T13:30Z	0.861	false
2020-04-01T13:15Z	0.859	false
2020-04-01T13:00Z	0.857	false
2020-04-01T12:45Z	0.855	false
2020-04-01T12:30Z	0.853	false
2020-04-01T12:15Z	0.852	false
2020-04-01T12:00Z	0.85	false
2020-04-01T11:45Z	0.848	false
2020-04-01T11:30Z	0.846	false
2020-04-01T11:15Z	0.844	false
2020-04-01T11:00Z	0.842	false
2020-04-01T10:45Z	0.84	false
2020-04-01T10:30Z	0.837	false
2020-04-01T10:15Z	0.836	false
2020-04-01T10:00Z	0.834	false
2020-04-01T09:45Z	0.832	false
2020-04-01T09:30Z	0.832	false
2020-04-01T09:15Z	0.832	false
2020-04-01T09:00Z	0.831	false
2020-04-01T08:45Z	0.831	false
2020-04-01T08:30Z	0.83	false
2020-04-01T08:15Z	0.829	false
2020-04-01T08:00Z	0.828	false
2020-04-01T07:45Z	0.827	false
2020-04-01T07:30Z	0.825	false
2020-04-01T07:15Z	0.825	false
2020-04-01T07:00Z	0.824	false
2020-04-01T06:45Z	0.824	false
2020-04-01T06:30Z	0.823	false
2020-04-01T06:15Z	0.824	false
2020-04-01T06:00Z	0.824	false
2020-04-01T05:45Z	0.826	false
2020-04-01T05:30Z	0.826	false
2020-04-01T05:15Z	0.827	false
2020-04-01T05:00Z	0.827	false
2020-04-01T04:45Z	0.829	false
2020-04-01T04:30Z	0.83	false
2020-04-01T04:15Z	0.831	false
2020-04-01T04:00Z	0.832	false
2020-04-01T03:45Z	0.835	false
2020-04-01T03:30Z	0.836	false
2020-04-01T03:15Z	0.838	false
2020-04-01T03:00Z	0.84	false
2020-04-01T02:45Z	0.842	false
2020-04-01T02:30Z	0.844	false
2020-04-01T02:15Z	0.846	false
2020-04-01T02:00Z	0.847	false
2020-04-01T01:45Z	0.849	false
2020-04-01T01:30Z	0.849	false
2020-04-01T01:15Z	0.851	false
2020-04-01T01:00Z	0.852	false
2020-04-01T00:45Z	0.853	false
2020-04-01T00:30Z	0.854	false
2020-04-01T00:15Z	0.855	false
2020-04-01T00:00Z	0.856	false
2020-03-31T23:45Z	0.857	false
2020-03-31T23:30Z	0.858	false
2020-03-31T23:15Z	0.858	false
2020-03-31T23:00Z	0.86	false
2020-03-31T22:45Z	0.86	false
2020-03-31T22:30Z	0.861	false
2020-03-31T22:15Z	0.862	false
2020-03-31T22:00Z	0.862	false
2020-03-31T21:45Z	0.862	false
2020-03-31T21:30Z	0.863	false
2020-03-31T21:15Z	0.864	false
2020-03-31T21:00Z	0.864	false
2020-03-31T20:45Z	0.863	false
2020-03-31T20:30Z	0.864	false
2020-03-31T20:15Z	0.863	false
2020-03-31T20:00Z	0.862	false
2020-03-31T19:45Z	0.861	false
2020-03-31T19:30Z	0.86	false
2020-03-31T19:15Z	0.86	false
2020-03-31T19:00Z	0.86	false
2020-03-31T18:45Z	0.861	false
2020-03-31T18:30Z	0.861	false
2020-03-31T18:15Z	0.862	false
2020-03-31T18:00Z	0.862	false
2020-03-31T17:45Z	0.862	false
2020-03-31T17:30Z	0.862	false
2020-03-31T17:15Z	0.864	false
2020-03-31T17:00Z	0.864	false
2020-03-31T16:45Z	0.863	false
2020-03-31T16:30Z	0.864	false
2020-03-31T16:15Z	0.866	false
2020-03-31T16:00Z	0.866	false
2020-03-31T15:45Z	0.866	false
2020-03-31T15:30Z	0.866	false
2020-03-31T15:15Z	0.866	false
2020-03-31T15:00Z	0.866	false
2020-03-31T14:45Z	0.866	false
2020-03-31T14:30Z	0.865	false
2020-03-31T14:15Z	0.864	false
2020-03-31T14:00Z	0.862	false
2020-03-31T13:45Z	0.861	false
2020-03-31T13:30Z	0.86	false
2020-03-31T13:15Z	0.86	false
2020-03-31T13:00Z	0.858	false
2020-03-31T12:45Z	0.858	false
2020-03-31T12:30Z	0.856	false
2020-03-31T12:15Z	0.855	false
2020-03-31T12:00Z	0.853	false
2020-03-31T11:45Z	0.851	false
2020-03-31T11:30Z	0.85	false
2020-03-31T11:15Z	0.849	false
2020-03-31T11:00Z	0.846	false
2020-03-31T10:45Z	0.844	false
2020-03-31T10:30Z	0.841	false
2020-03-31T10:15Z	0.839	false
2020-03-31T10:00Z	0.837	false
2020-03-31T09:45Z	0.836	false
2020-03-31T09:30Z	0.835	false
2020-03-31T09:15Z	0.835	false
2020-03-31T09:00Z	0.833	false
2020-03-31T08:45Z	0.832	false
2020-03-31T08:30Z	0.831	false
2020-03-31T08:15Z	0.828	false
2020-03-31T08:00Z	0.827	false
2020-03-31T07:45Z	0.827	false
2020-03-31T07:30Z	0.827	false
2020-03-31T07:15Z	0.828	false
2020-03-31T07:00Z	0.831	false
2020-03-31T06:45Z	0.831	false
2020-03-31T06:30Z	0.832	false
2020-03-31T06:15Z	0.833	false
2020-03-31T06:00Z	0.834	false
2020-03-31T05:45Z	0.834	false
2020-03-31T05:30Z	0.835	false
2020-03-31T05:15Z	0.836	false
2020-03-31T05:00Z	0.836	false
2020-03-31T04:45Z	0.838	false
2020-03-31T04:30Z	0.839	false
2020-03-31T04:15Z	0.841	false
2020-03-31T04:00Z	0.842	false
2020-03-31T03:45Z	0.844	false
2020-03-31T03:30Z	0.846	false
2020-03-31T03:15Z	0.848	false
2020-03-31T03:00Z	0.849	false
2020-03-31T02:45Z	0.852	false
2020-03-31T02:30Z	0.852	false
2020-03-31T02:15Z	0.853	false
2020-03-31T02:00Z	0.854	false
2020-03-31T01:45Z	0.855	false
2020-03-31T01:30Z	0.856	false
2020-03-31T01:15Z	0.859	false
2020-03-31T01:00Z	0.859	false
2020-03-31T00:45Z	0.861	false
2020-03-31T00:30Z	0.861	false
2020-03-31T00:15Z	0.863	false
2020-03-31T00:00Z	0.864	false
2020-03-30T23:45Z	0.866	false
2020-03-30T23:30Z	0.866	false
2020-03-30T23:15Z	0.867	false
2020-03-30T23:00Z	0.868	false
2020-03-30T22:45Z	0.869	false
2020-03-30T22:30Z	0.869	false
2020-03-30T22:15Z	0.87	false
2020-03-30T22:00Z	0.869	false
2020-03-30T21:45Z	0.87	false
2020-03-30T21:30Z	0.871	false
2020-03-30T21:15Z	0.872	false
2020-03-30T21:00Z	0.871	false
2020-03-30T20:45Z	0.871	false
2020-03-30T20:30Z	0.869	false
2020-03-30T20:15Z	0.869	false
2020-03-30T20:00Z	0.869	false
2020-03-30T19:45Z	0.869	false
2020-03-30T19:30Z	0.867	false
2020-03-30T19:15Z	0.867	false
2020-03-30T19:00Z	0.867	false
2020-03-30T18:45Z	0.867	false
2020-03-30T18:30Z	0.867	false
2020-03-30T18:15Z	0.869	false
2020-03-30T18:00Z	0.869	false
2020-03-30T17:45Z	0.87	false
2020-03-30T17:30Z	0.87	false
2020-03-30T17:15Z	0.871	false
2020-03-30T17:00Z	0.871	false
2020-03-30T16:45Z	0.872	false
2020-03-30T16:30Z	0.872	false
2020-03-30T16:15Z	0.872	false
2020-03-30T16:00Z	0.872	false
2020-03-30T15:45Z	0.872	false
2020-03-30T15:30Z	0.873	false
2020-03-30T15:15Z	0.873	false
2020-03-30T15:00Z	0.876	false
2020-03-30T14:45Z	0.871	false
2020-03-30T14:30Z	0.871	false
2020-03-30T14:15Z	0.869	false
2020-03-30T14:00Z	0.868	false
2020-03-30T13:45Z	0.868	false
2020-03-30T13:30Z	0.866	false
2020-03-30T13:15Z	0.864	false
2020-03-30T13:00Z	0.865	false
2020-03-30T12:45Z	0.864	false
2020-03-30T12:30Z	0.861	false
2020-03-30T12:15Z	0.861	false
2020-03-30T12:00Z	0.856	false
2020-03-30T11:45Z	0.857	false
2020-03-30T11:30Z	0.854	false
2020-03-30T11:15Z	0.853	false
2020-03-30T11:00Z	0.851	false
2020-03-30T10:45Z	0.848	false
2020-03-30T10:30Z	0.847	false
2020-03-30T10:15Z	0.845	false
2020-03-30T10:00Z	0.843	false
2020-03-30T09:45Z	0.843	false
2020-03-30T09:30Z	0.841	false
2020-03-30T09:15Z	0.84	false
2020-03-30T09:00Z	0.839	false
2020-03-30T08:45Z	0.838	false
2020-03-30T08:30Z	0.836	false
2020-03-30T08:15Z	0.835	false
2020-03-30T08:00Z	0.834	false
2020-03-30T07:45Z	0.833	false
2020-03-30T07:30Z	0.833	false
2020-03-30T07:15Z	0.833	false
2020-03-30T07:00Z	0.832	false
2020-03-30T06:45Z	0.833	false
2020-03-30T06:30Z	0.832	false
2020-03-30T06:15Z	0.833	false
2020-03-30T06:00Z	0.833	false
2020-03-30T05:45Z	0.835	false
2020-03-30T05:30Z	0.835	false
2020-03-30T05:15Z	0.836	false
2020-03-30T05:00Z	0.836	false
2020-03-30T04:45Z	0.838	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
• View your property's long term risk of flooding

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