River level River Thames at Marlow Lock (downstream data)

Check for flood warnings in this area

Latest recorded level 2.88m at 11:00pm Friday 24 January 2020.

View upstream data for this station

Why are there 2 sets of data for this station?

Some monitoring stations are located near to a man-made structure which affects the river's flow characteristics, for example a weir, or lock. For these stations, we provide river levels from both the upstream and downstream sides of the structure.

River levels at this location in the last 5 days

Now
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• Measured level
• When the water level reaches 3.23m 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
2020-01-24T23:00Z	2.879	false
2020-01-24T22:45Z	2.866	false
2020-01-24T22:30Z	2.866	false
2020-01-24T22:15Z	2.867	false
2020-01-24T22:00Z	2.873	false
2020-01-24T21:45Z	2.87	false
2020-01-24T21:30Z	2.871	false
2020-01-24T21:15Z	2.871	false
2020-01-24T21:00Z	2.876	false
2020-01-24T20:45Z	2.873	false
2020-01-24T20:30Z	2.87	false
2020-01-24T20:15Z	2.88	false
2020-01-24T20:00Z	2.875	false
2020-01-24T19:45Z	2.866	false
2020-01-24T19:30Z	2.871	false
2020-01-24T19:15Z	2.877	false
2020-01-24T19:00Z	2.867	false
2020-01-24T18:45Z	2.875	false
2020-01-24T18:30Z	2.867	false
2020-01-24T18:15Z	2.871	false
2020-01-24T18:00Z	2.872	false
2020-01-24T17:45Z	2.866	false
2020-01-24T17:30Z	2.864	false
2020-01-24T17:15Z	2.862	false
2020-01-24T17:00Z	2.864	false
2020-01-24T16:45Z	2.869	false
2020-01-24T16:30Z	2.869	false
2020-01-24T16:15Z	2.859	false
2020-01-24T16:00Z	2.863	false
2020-01-24T15:45Z	2.871	false
2020-01-24T15:30Z	2.865	false
2020-01-24T15:15Z	2.86	false
2020-01-24T15:00Z	2.852	false
2020-01-24T14:45Z	2.853	false
2020-01-24T14:30Z	2.844	false
2020-01-24T14:15Z	2.845	false
2020-01-24T14:00Z	2.842	false
2020-01-24T13:45Z	2.838	false
2020-01-24T13:30Z	2.838	false
2020-01-24T13:15Z	2.825	false
2020-01-24T13:00Z	2.83	false
2020-01-24T12:45Z	2.832	false
2020-01-24T12:30Z	2.834	false
2020-01-24T12:15Z	0	false
2020-01-24T12:00Z	0	false
2020-01-24T10:15Z	2.882	false
2020-01-24T10:15Z	2.882	false
2020-01-24T10:00Z	2.883	false
2020-01-24T10:00Z	2.883	false
2020-01-24T09:45Z	2.89	false
2020-01-24T09:45Z	2.89	false
2020-01-24T09:30Z	2.89	false
2020-01-24T09:30Z	2.89	false
2020-01-24T09:15Z	2.885	false
2020-01-24T09:15Z	2.885	false
2020-01-24T09:00Z	2.882	false
2020-01-24T09:00Z	2.882	false
2020-01-24T08:45Z	2.896	false
2020-01-24T08:45Z	2.896	false
2020-01-24T08:30Z	2.892	false
2020-01-24T08:30Z	2.892	false
2020-01-24T08:15Z	2.894	false
2020-01-24T08:15Z	2.894	false
2020-01-24T08:00Z	2.888	false
2020-01-24T08:00Z	2.888	false
2020-01-24T07:45Z	2.891	false
2020-01-24T07:45Z	2.891	false
2020-01-24T07:30Z	2.897	false
2020-01-24T07:30Z	2.897	false
2020-01-24T07:15Z	2.893	false
2020-01-24T07:15Z	2.893	false
2020-01-24T07:00Z	2.892	false
2020-01-24T07:00Z	2.892	false
2020-01-24T06:45Z	2.889	false
2020-01-24T06:45Z	2.889	false
2020-01-24T06:30Z	2.905	false
2020-01-24T06:30Z	2.905	false
2020-01-24T06:15Z	2.905	false
2020-01-24T06:15Z	2.905	false
2020-01-24T06:00Z	2.898	false
2020-01-24T06:00Z	2.898	false
2020-01-24T05:45Z	2.896	false
2020-01-24T05:45Z	2.896	false
2020-01-24T05:30Z	2.899	false
2020-01-24T05:30Z	2.899	false
2020-01-24T05:15Z	2.898	false
2020-01-24T05:15Z	2.898	false
2020-01-24T05:00Z	2.914	false
2020-01-24T05:00Z	2.914	false
2020-01-24T04:45Z	2.905	false
2020-01-24T04:45Z	2.905	false
2020-01-24T04:30Z	2.896	false
2020-01-24T04:30Z	2.896	false
2020-01-24T04:15Z	2.895	false
2020-01-24T04:15Z	2.895	false
2020-01-24T04:00Z	2.905	false
2020-01-24T04:00Z	2.905	false
2020-01-24T03:45Z	2.912	false
2020-01-24T03:45Z	2.912	false
2020-01-24T03:30Z	2.915	false
2020-01-24T03:30Z	2.915	false
2020-01-24T03:15Z	2.907	false
2020-01-24T03:15Z	2.907	false
2020-01-24T03:00Z	2.908	false
2020-01-24T03:00Z	2.908	false
2020-01-24T02:45Z	2.92	false
2020-01-24T02:45Z	2.92	false
2020-01-24T02:30Z	2.917	false
2020-01-24T02:30Z	2.917	false
2020-01-24T02:15Z	2.915	false
2020-01-24T02:15Z	2.915	false
2020-01-24T02:00Z	2.914	false
2020-01-24T02:00Z	2.914	false
2020-01-24T01:45Z	2.922	false
2020-01-24T01:45Z	2.922	false
2020-01-24T01:30Z	2.919	false
2020-01-24T01:30Z	2.919	false
2020-01-24T01:15Z	2.913	false
2020-01-24T01:15Z	2.913	false
2020-01-24T01:00Z	2.925	false
2020-01-24T01:00Z	2.925	false
2020-01-24T00:45Z	2.929	false
2020-01-24T00:45Z	2.929	false
2020-01-24T00:30Z	2.927	false
2020-01-24T00:30Z	2.927	false
2020-01-24T00:15Z	2.923	false
2020-01-24T00:15Z	2.923	false
2020-01-24T00:00Z	2.921	false
2020-01-24T00:00Z	2.921	false
2020-01-23T23:45Z	2.932	false
2020-01-23T23:45Z	2.932	false
2020-01-23T23:30Z	2.936	false
2020-01-23T23:30Z	2.936	false
2020-01-23T23:15Z	2.932	false
2020-01-23T23:15Z	2.932	false
2020-01-23T23:00Z	2.929	false
2020-01-23T23:00Z	2.929	false
2020-01-23T22:45Z	2.93	false
2020-01-23T22:45Z	2.93	false
2020-01-23T22:30Z	2.939	false
2020-01-23T22:30Z	2.939	false
2020-01-23T22:15Z	2.942	false
2020-01-23T22:15Z	2.942	false
2020-01-23T22:00Z	2.945	false
2020-01-23T22:00Z	2.945	false
2020-01-23T21:45Z	2.94	false
2020-01-23T21:45Z	2.94	false
2020-01-23T21:30Z	2.933	false
2020-01-23T21:30Z	2.933	false
2020-01-23T21:15Z	2.933	false
2020-01-23T21:15Z	2.933	false
2020-01-23T21:00Z	2.942	false
2020-01-23T21:00Z	2.942	false
2020-01-23T20:45Z	2.952	false
2020-01-23T20:45Z	2.952	false
2020-01-23T20:30Z	2.948	false
2020-01-23T20:30Z	2.948	false
2020-01-23T20:15Z	2.942	false
2020-01-23T20:15Z	2.942	false
2020-01-23T20:00Z	2.938	false
2020-01-23T20:00Z	2.938	false
2020-01-23T19:45Z	2.947	false
2020-01-23T19:45Z	2.947	false
2020-01-23T19:30Z	2.949	false
2020-01-23T19:30Z	2.949	false
2020-01-23T19:15Z	2.947	false
2020-01-23T19:15Z	2.947	false
2020-01-23T19:00Z	2.953	false
2020-01-23T19:00Z	2.953	false
2020-01-23T18:45Z	2.95	false
2020-01-23T18:45Z	2.95	false
2020-01-23T18:30Z	2.949	false
2020-01-23T18:30Z	2.949	false
2020-01-23T18:15Z	2.949	false
2020-01-23T18:15Z	2.949	false
2020-01-23T18:00Z	2.943	false
2020-01-23T18:00Z	2.943	false
2020-01-23T17:45Z	2.957	false
2020-01-23T17:45Z	2.957	false
2020-01-23T17:30Z	2.961	false
2020-01-23T17:30Z	2.961	false
2020-01-23T17:15Z	2.957	false
2020-01-23T17:15Z	2.957	false
2020-01-23T17:00Z	2.948	false
2020-01-23T17:00Z	2.948	false
2020-01-23T16:45Z	2.939	false
2020-01-23T16:45Z	2.939	false
2020-01-23T16:30Z	2.941	false
2020-01-23T16:30Z	2.941	false
2020-01-23T16:15Z	2.951	false
2020-01-23T16:15Z	2.951	false
2020-01-23T16:00Z	2.954	false
2020-01-23T16:00Z	2.954	false
2020-01-23T15:45Z	2.945	false
2020-01-23T15:45Z	2.945	false
2020-01-23T15:30Z	2.934	false
2020-01-23T15:30Z	2.934	false
2020-01-23T15:15Z	2.932	false
2020-01-23T15:15Z	2.932	false
2020-01-23T15:00Z	2.928	false
2020-01-23T15:00Z	2.928	false
2020-01-23T14:45Z	2.921	false
2020-01-23T14:45Z	2.921	false
2020-01-23T14:30Z	2.912	false
2020-01-23T14:30Z	2.912	false
2020-01-23T14:15Z	2.91	false
2020-01-23T14:15Z	2.91	false
2020-01-23T14:00Z	2.918	false
2020-01-23T14:00Z	2.918	false
2020-01-23T13:45Z	2.949	false
2020-01-23T13:45Z	2.949	false
2020-01-23T13:30Z	2.982	false
2020-01-23T13:30Z	2.982	false
2020-01-23T13:15Z	2.988	false
2020-01-23T13:15Z	2.988	false
2020-01-23T13:00Z	3.001	false
2020-01-23T13:00Z	3.001	false
2020-01-23T12:45Z	3.006	false
2020-01-23T12:45Z	3.006	false
2020-01-23T12:30Z	3.018	false
2020-01-23T12:30Z	3.018	false
2020-01-23T12:15Z	3.025	false
2020-01-23T12:15Z	3.025	false
2020-01-23T12:00Z	3.029	false
2020-01-23T12:00Z	3.029	false
2020-01-23T11:45Z	3.04	false
2020-01-23T11:30Z	3.035	false
2020-01-23T11:15Z	3.041	false
2020-01-23T11:00Z	3.042	false
2020-01-23T10:45Z	3.034	false
2020-01-23T10:30Z	3.036	false
2020-01-23T10:15Z	3.034	false
2020-01-23T10:00Z	3.036	false
2020-01-23T09:45Z	3.03	false
2020-01-23T09:30Z	3.035	false
2020-01-23T09:15Z	3.031	false
2020-01-23T09:00Z	3.04	false
2020-01-23T08:45Z	3.041	false
2020-01-23T08:30Z	3.047	false
2020-01-23T08:15Z	3.048	false
2020-01-23T08:00Z	3.052	false
2020-01-23T07:45Z	3.051	false
2020-01-23T07:30Z	3.054	false
2020-01-23T07:15Z	3.064	false
2020-01-23T07:00Z	3.055	false
2020-01-23T06:45Z	3.057	false
2020-01-23T06:30Z	3.057	false
2020-01-23T06:15Z	3.057	false
2020-01-23T06:00Z	3.053	false
2020-01-23T05:45Z	3.056	false
2020-01-23T05:30Z	3.058	false
2020-01-23T05:15Z	3.065	false
2020-01-23T05:00Z	3.065	false
2020-01-23T04:45Z	3.071	false
2020-01-23T04:30Z	3.071	false
2020-01-23T04:15Z	3.071	false
2020-01-23T04:00Z	3.061	false
2020-01-23T03:45Z	3.065	false
2020-01-23T03:30Z	3.067	false
2020-01-23T03:15Z	3.066	false
2020-01-23T03:00Z	3.071	false
2020-01-23T02:45Z	3.077	false
2020-01-23T02:30Z	3.077	false
2020-01-23T02:15Z	3.082	false
2020-01-23T02:00Z	3.089	false
2020-01-23T01:45Z	3.077	false
2020-01-23T01:30Z	3.081	false
2020-01-23T01:15Z	3.079	false
2020-01-23T01:00Z	3.087	false
2020-01-23T00:45Z	3.091	false
2020-01-23T00:30Z	3.087	false
2020-01-23T00:15Z	3.095	false
2020-01-23T00:00Z	3.096	false
2020-01-22T23:45Z	3.099	false
2020-01-22T23:30Z	3.101	false
2020-01-22T23:15Z	3.098	false
2020-01-22T23:00Z	3.101	false
2020-01-22T22:45Z	3.108	false
2020-01-22T22:30Z	3.108	false
2020-01-22T22:15Z	3.104	false
2020-01-22T22:00Z	3.102	false
2020-01-22T21:45Z	3.1	false
2020-01-22T21:30Z	3.11	false
2020-01-22T21:15Z	3.109	false
2020-01-22T21:00Z	3.109	false
2020-01-22T20:45Z	3.114	false
2020-01-22T20:30Z	3.121	false
2020-01-22T20:15Z	3.12	false
2020-01-22T20:00Z	3.128	false
2020-01-22T19:45Z	3.13	false
2020-01-22T19:30Z	3.129	false
2020-01-22T19:15Z	3.131	false
2020-01-22T19:00Z	3.123	false
2020-01-22T18:45Z	3.124	false
2020-01-22T18:30Z	3.124	false
2020-01-22T18:15Z	3.118	false
2020-01-22T18:00Z	3.118	false
2020-01-22T17:45Z	3.12	false
2020-01-22T17:30Z	3.125	false
2020-01-22T17:15Z	3.124	false
2020-01-22T17:00Z	3.133	false
2020-01-22T16:45Z	3.136	false
2020-01-22T16:30Z	3.14	false
2020-01-22T16:15Z	3.151	false
2020-01-22T16:00Z	3.157	false
2020-01-22T15:45Z	3.173	false
2020-01-22T15:30Z	3.18	false
2020-01-22T15:15Z	3.187	false
2020-01-22T15:00Z	3.196	false
2020-01-22T14:45Z	3.2	false
2020-01-22T14:30Z	3.188	false
2020-01-22T14:15Z	3.195	false
2020-01-22T14:00Z	3.197	false
2020-01-22T13:45Z	3.208	false
2020-01-22T13:30Z	3.22	false
2020-01-22T13:15Z	3.222	false
2020-01-22T13:00Z	3.233	false
2020-01-22T12:45Z	3.231	false
2020-01-22T12:30Z	3.226	false
2020-01-22T12:15Z	3.223	false
2020-01-22T12:00Z	3.221	false
2020-01-22T11:45Z	3.214	false
2020-01-22T11:30Z	3.22	false
2020-01-22T11:15Z	3.226	false
2020-01-22T11:00Z	3.242	false
2020-01-22T10:45Z	3.241	false
2020-01-22T10:30Z	3.24	false
2020-01-22T10:15Z	3.241	false
2020-01-22T10:00Z	3.228	false
2020-01-22T09:45Z	3.232	false
2020-01-22T09:30Z	3.234	false
2020-01-22T09:15Z	3.234	false
2020-01-22T09:00Z	3.233	false
2020-01-22T08:45Z	3.239	false
2020-01-22T08:30Z	3.246	false
2020-01-22T08:15Z	3.263	false
2020-01-22T08:00Z	3.25	false
2020-01-22T07:45Z	3.241	false
2020-01-22T07:30Z	3.246	false
2020-01-22T07:15Z	3.265	false
2020-01-22T07:00Z	3.257	false
2020-01-22T06:45Z	3.264	false
2020-01-22T06:30Z	3.27	false
2020-01-22T06:15Z	3.26	false
2020-01-22T06:00Z	3.256	false
2020-01-22T05:45Z	3.271	false
2020-01-22T05:30Z	3.276	false
2020-01-22T05:15Z	3.27	false
2020-01-22T05:00Z	3.263	false
2020-01-22T04:45Z	3.267	false
2020-01-22T04:30Z	3.28	false
2020-01-22T04:15Z	3.289	false
2020-01-22T04:00Z	3.294	false
2020-01-22T03:45Z	3.283	false
2020-01-22T03:30Z	3.279	false
2020-01-22T03:15Z	3.282	false
2020-01-22T03:00Z	3.292	false
2020-01-22T02:45Z	3.301	false
2020-01-22T02:30Z	3.284	false
2020-01-22T02:15Z	3.286	false
2020-01-22T02:00Z	3.297	false
2020-01-22T01:45Z	3.311	false
2020-01-22T01:30Z	3.309	false
2020-01-22T01:15Z	3.29	false
2020-01-22T01:00Z	3.298	false
2020-01-22T00:45Z	3.308	false
2020-01-22T00:30Z	3.313	false
2020-01-22T00:15Z	3.304	false
2020-01-22T00:00Z	3.3	false
2020-01-21T23:45Z	3.32	false
2020-01-21T23:30Z	3.321	false
2020-01-21T23:15Z	3.31	false
2020-01-21T23:00Z	3.308	false
2020-01-21T22:45Z	3.323	false
2020-01-21T22:30Z	3.326	false
2020-01-21T22:15Z	3.322	false
2020-01-21T22:00Z	3.314	false
2020-01-21T21:45Z	3.326	false
2020-01-21T21:30Z	3.326	false
2020-01-21T21:15Z	3.32	false
2020-01-21T21:00Z	3.328	false
2020-01-21T20:45Z	3.338	false
2020-01-21T20:30Z	3.331	false
2020-01-21T20:15Z	3.33	false
2020-01-21T20:00Z	3.336	false
2020-01-21T19:45Z	3.353	false
2020-01-21T19:30Z	3.343	false
2020-01-21T19:15Z	3.32	false
2020-01-21T19:00Z	3.346	false
2020-01-21T18:45Z	3.352	false
2020-01-21T18:30Z	3.334	false
2020-01-21T18:15Z	3.339	false
2020-01-21T18:00Z	3.363	false
2020-01-21T17:45Z	3.344	false
2020-01-21T17:30Z	3.348	false
2020-01-21T17:15Z	3.349	false
2020-01-21T17:00Z	3.351	false
2020-01-21T16:45Z	3.349	false
2020-01-21T16:30Z	3.369	false
2020-01-21T16:15Z	3.378	false
2020-01-21T16:00Z	3.356	false
2020-01-21T15:45Z	3.369	false
2020-01-21T15:30Z	3.372	false
2020-01-21T15:15Z	3.366	false
2020-01-21T15:00Z	3.384	false
2020-01-21T14:45Z	3.389	false
2020-01-21T14:30Z	3.375	false
2020-01-21T14:15Z	3.371	false
2020-01-21T14:00Z	3.393	false
2020-01-21T13:45Z	3.412	false
2020-01-21T13:30Z	3.39	false
2020-01-21T13:15Z	3.406	false
2020-01-21T13:00Z	3.401	false
2020-01-21T12:45Z	3.391	false
2020-01-21T12:30Z	3.394	false
2020-01-21T12:15Z	3.429	false
2020-01-21T12:00Z	3.402	false
2020-01-21T11:45Z	3.418	false
2020-01-21T11:30Z	3.413	false
2020-01-21T11:15Z	3.397	false
2020-01-21T11:00Z	3.415	false
2020-01-21T10:45Z	3.417	false
2020-01-21T10:30Z	3.419	false
2020-01-21T10:15Z	3.428	false
2020-01-21T10:00Z	3.417	false
2020-01-21T09:45Z	3.434	false
2020-01-21T09:30Z	3.43	false
2020-01-21T09:15Z	3.415	false
2020-01-21T09:00Z	3.436	false
2020-01-21T08:45Z	3.43	false
2020-01-21T08:30Z	3.426	false
2020-01-21T08:15Z	3.448	false
2020-01-21T08:00Z	3.446	false
2020-01-21T07:45Z	3.449	false
2020-01-21T07:30Z	3.438	false
2020-01-21T07:15Z	3.442	false
2020-01-21T07:00Z	3.458	false
2020-01-21T06:45Z	3.441	false
2020-01-21T06:30Z	3.469	false
2020-01-21T06:15Z	3.457	false
2020-01-21T06:00Z	3.452	false
2020-01-21T05:45Z	3.459	false
2020-01-21T05:30Z	3.443	false
2020-01-21T05:15Z	3.468	false
2020-01-21T05:00Z	3.465	false
2020-01-21T04:45Z	3.453	false
2020-01-21T04:30Z	3.478	false
2020-01-21T04:15Z	3.454	false
2020-01-21T04:00Z	3.463	false
2020-01-21T04:00Z	3.463	false
2020-01-21T03:45Z	3.486	false
2020-01-21T03:45Z	3.486	false
2020-01-21T03:30Z	3.463	false
2020-01-21T03:30Z	3.463	false
2020-01-21T03:15Z	3.493	false
2020-01-21T03:15Z	3.493	false
2020-01-21T03:00Z	3.477	false
2020-01-21T02:45Z	3.491	false
2020-01-21T02:30Z	3.498	false
2020-01-21T02:15Z	3.479	false
2020-01-21T02:00Z	3.514	false
2020-01-21T01:45Z	3.486	false
2020-01-21T01:30Z	3.501	false
2020-01-21T01:15Z	3.509	false
2020-01-21T01:00Z	3.503	false
2020-01-21T00:45Z	3.502	false
2020-01-21T00:30Z	3.496	false
2020-01-21T00:15Z	3.524	false
2020-01-21T00:00Z	3.504	false
2020-01-20T23:45Z	3.528	false
2020-01-20T23:30Z	3.508	false
2020-01-20T23:15Z	3.508	false
2020-01-20T23:00Z	3.528	false
2020-01-20T22:45Z	3.51	false
2020-01-20T22:30Z	3.532	false
2020-01-20T22:15Z	3.506	false
2020-01-20T22:00Z	3.53	false
2020-01-20T21:45Z	3.527	false
2020-01-20T21:30Z	3.537	false
2020-01-20T21:15Z	3.525	false
2020-01-20T21:00Z	3.544	false
2020-01-20T20:45Z	3.533	false
2020-01-20T20:30Z	3.524	false
2020-01-20T20:15Z	3.549	false
2020-01-20T20:00Z	3.535	false
2020-01-20T19:45Z	3.561	false
2020-01-20T19:30Z	3.537	false
2020-01-20T19:15Z	3.551	false
2020-01-20T19:00Z	3.548	false
2020-01-20T18:45Z	3.56	false
2020-01-20T18:30Z	3.541	false
2020-01-20T18:15Z	3.554	false
2020-01-20T18:00Z	3.555	false
2020-01-20T17:45Z	3.569	false
2020-01-20T17:30Z	3.559	false
2020-01-20T17:15Z	3.573	false
2020-01-20T17:00Z	3.568	false
2020-01-20T16:45Z	3.579	false
2020-01-20T16:30Z	3.569	false
2020-01-20T16:15Z	3.604	false
2020-01-20T16:00Z	3.585	false
2020-01-20T15:45Z	3.586	false
2020-01-20T15:30Z	3.593	false
2020-01-20T15:15Z	3.601	false
2020-01-20T15:00Z	3.581	false
2020-01-20T14:45Z	3.591	false
2020-01-20T14:30Z	3.586	false
2020-01-20T14:15Z	3.61	false
2020-01-20T14:00Z	3.584	false
2020-01-20T13:45Z	3.622	false
2020-01-20T13:30Z	3.6	false
2020-01-20T13:15Z	3.616	false
2020-01-20T13:00Z	3.61	false
2020-01-20T12:45Z	3.627	false
2020-01-20T12:30Z	3.611	false
2020-01-20T12:15Z	3.609	false
2020-01-20T12:00Z	3.604	false
2020-01-20T12:00Z	3.604	false
2020-01-20T11:45Z	3.624	false
2020-01-20T11:45Z	3.624	false
2020-01-20T11:30Z	3.644	false
2020-01-20T11:30Z	3.644	false
2020-01-20T11:15Z	3.617	false
2020-01-20T11:15Z	3.617	false
2020-01-20T11:00Z	3.634	false
2020-01-20T10:45Z	3.646	false
2020-01-20T10:30Z	3.615	false
2020-01-20T10:15Z	3.65	false
2020-01-20T10:00Z	3.662	false
2020-01-20T09:45Z	3.64	false
2020-01-20T09:30Z	3.63	false
2020-01-20T09:15Z	3.666	false
2020-01-20T09:00Z	3.638	false
2020-01-20T08:45Z	3.654	false
2020-01-20T08:30Z	3.653	false
2020-01-20T08:15Z	3.638	false
2020-01-20T08:00Z	3.671	false
2020-01-20T07:45Z	3.663	false
2020-01-20T07:30Z	3.664	false
2020-01-20T07:15Z	3.676	false
2020-01-20T07:00Z	3.659	false
2020-01-20T06:45Z	3.675	false
2020-01-20T06:30Z	3.678	false
2020-01-20T06:15Z	3.667	false
2020-01-20T06:00Z	3.668	false
2020-01-20T05:45Z	3.679	false
2020-01-20T05:30Z	3.67	false
2020-01-20T05:15Z	3.691	false
2020-01-20T05:00Z	3.676	false
2020-01-20T04:45Z	3.676	false
2020-01-20T04:30Z	3.702	false
2020-01-20T04:15Z	3.703	false
2020-01-20T04:00Z	3.679	false
2020-01-20T03:45Z	3.718	false
2020-01-20T03:30Z	3.712	false
2020-01-20T03:15Z	3.685	false
2020-01-20T03:00Z	3.723	false
2020-01-20T02:45Z	3.7	false
2020-01-20T02:30Z	3.69	false
2020-01-20T02:15Z	3.721	false
2020-01-20T02:00Z	3.728	false
2020-01-20T01:45Z	3.696	false
2020-01-20T01:30Z	3.696	false
2020-01-20T01:15Z	3.724	false
2020-01-20T01:00Z	3.707	false
2020-01-20T00:45Z	3.7	false
2020-01-20T00:30Z	3.745	false
2020-01-20T00:15Z	3.713	false
2020-01-20T00:00Z	3.694	false
2020-01-19T23:45Z	3.743	false
2020-01-19T23:30Z	3.702	false
2020-01-19T23:15Z	3.72	false
2020-01-19T23:00Z	3.747	false
2020-01-19T22:45Z	3.73	false
2020-01-19T22:30Z	3.74	false
2020-01-19T22:15Z	3.732	false

Forecast data

Key information

• Station name: Marlow Lock (downstream)
• Station ID: 7396
• River name: River Thames
• Typical range: 2.02m to 3.23m
• Highest level on record: 4.73m on 10 February 2014
• Site datum: 22.77mAOD (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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