River level River Thames at Marsh Lock (downstream data)

Flooding is possible - Be prepared

The latest information indicates flooding is possible - Take action.

Check for flood warnings in this area

Latest recorded level 3.39m at 8:00pm Saturday 18 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 3.02m 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
2020-01-18T20:00Z	3.394	false
2020-01-18T19:45Z	3.404	false
2020-01-18T19:30Z	3.404	false
2020-01-18T19:15Z	3.389	false
2020-01-18T19:00Z	3.397	false
2020-01-18T18:45Z	3.387	false
2020-01-18T18:30Z	3.389	false
2020-01-18T18:15Z	3.393	false
2020-01-18T18:00Z	3.374	false
2020-01-18T17:45Z	3.389	false
2020-01-18T17:30Z	3.387	false
2020-01-18T17:15Z	3.389	false
2020-01-18T17:00Z	3.395	false
2020-01-18T16:45Z	3.386	false
2020-01-18T16:30Z	3.389	false
2020-01-18T16:15Z	3.392	false
2020-01-18T16:00Z	3.395	false
2020-01-18T15:45Z	3.383	false
2020-01-18T15:30Z	3.384	false
2020-01-18T15:15Z	3.389	false
2020-01-18T15:00Z	3.389	false
2020-01-18T14:45Z	3.378	false
2020-01-18T14:30Z	3.382	false
2020-01-18T14:15Z	3.389	false
2020-01-18T14:00Z	3.378	false
2020-01-18T13:45Z	3.38	false
2020-01-18T13:30Z	3.382	false
2020-01-18T13:15Z	3.386	false
2020-01-18T13:00Z	3.38	false
2020-01-18T12:45Z	3.382	false
2020-01-18T12:30Z	3.378	false
2020-01-18T12:15Z	3.377	false
2020-01-18T12:00Z	3.372	false
2020-01-18T11:45Z	3.375	false
2020-01-18T11:30Z	3.371	false
2020-01-18T11:15Z	3.375	false
2020-01-18T11:00Z	3.382	false
2020-01-18T10:45Z	3.374	false
2020-01-18T10:30Z	3.367	false
2020-01-18T10:15Z	3.366	false
2020-01-18T10:00Z	3.37	false
2020-01-18T09:45Z	3.37	false
2020-01-18T09:30Z	3.362	false
2020-01-18T09:15Z	3.367	false
2020-01-18T09:00Z	3.359	false
2020-01-18T08:45Z	3.362	false
2020-01-18T08:30Z	3.37	false
2020-01-18T08:15Z	3.363	false
2020-01-18T08:00Z	3.367	false
2020-01-18T07:45Z	3.362	false
2020-01-18T07:30Z	3.353	false
2020-01-18T07:15Z	3.366	false
2020-01-18T07:00Z	3.354	false
2020-01-18T06:45Z	3.366	false
2020-01-18T06:30Z	3.357	false
2020-01-18T06:15Z	3.362	false
2020-01-18T06:00Z	3.355	false
2020-01-18T05:45Z	3.358	false
2020-01-18T05:30Z	3.365	false
2020-01-18T05:15Z	3.36	false
2020-01-18T05:00Z	3.362	false
2020-01-18T04:45Z	3.354	false
2020-01-18T04:30Z	3.352	false
2020-01-18T04:15Z	3.345	false
2020-01-18T04:00Z	3.347	false
2020-01-18T03:45Z	3.352	false
2020-01-18T03:30Z	3.349	false
2020-01-18T03:15Z	3.347	false
2020-01-18T03:00Z	3.35	false
2020-01-18T02:45Z	3.351	false
2020-01-18T02:30Z	3.346	false
2020-01-18T02:15Z	3.337	false
2020-01-18T02:00Z	3.347	false
2020-01-18T01:45Z	3.343	false
2020-01-18T01:30Z	3.337	false
2020-01-18T01:15Z	3.349	false
2020-01-18T01:00Z	3.338	false
2020-01-18T00:45Z	3.34	false
2020-01-18T00:30Z	3.343	false
2020-01-18T00:15Z	3.356	false
2020-01-18T00:00Z	3.346	false
2020-01-17T23:45Z	3.335	false
2020-01-17T23:30Z	3.334	false
2020-01-17T23:15Z	3.339	false
2020-01-17T23:00Z	3.335	false
2020-01-17T22:45Z	3.319	false
2020-01-17T22:30Z	3.336	false
2020-01-17T22:15Z	3.32	false
2020-01-17T22:00Z	3.33	false
2020-01-17T21:45Z	3.333	false
2020-01-17T21:30Z	3.331	false
2020-01-17T21:15Z	3.328	false
2020-01-17T21:00Z	3.328	false
2020-01-17T20:45Z	3.32	false
2020-01-17T20:30Z	3.327	false
2020-01-17T20:15Z	3.33	false
2020-01-17T20:00Z	3.326	false
2020-01-17T19:45Z	3.316	false
2020-01-17T19:30Z	3.326	false
2020-01-17T19:15Z	3.316	false
2020-01-17T19:00Z	3.328	false
2020-01-17T18:45Z	3.319	false
2020-01-17T18:30Z	3.31	false
2020-01-17T18:15Z	3.309	false
2020-01-17T18:00Z	3.319	false
2020-01-17T17:45Z	3.321	false
2020-01-17T17:30Z	3.304	false
2020-01-17T17:15Z	3.303	false
2020-01-17T17:00Z	3.315	false
2020-01-17T16:45Z	3.308	false
2020-01-17T16:30Z	3.306	false
2020-01-17T16:15Z	3.304	false
2020-01-17T16:00Z	3.295	false
2020-01-17T15:45Z	3.3	false
2020-01-17T15:30Z	3.312	false
2020-01-17T15:15Z	3.299	false
2020-01-17T15:00Z	3.294	false
2020-01-17T14:45Z	3.303	false
2020-01-17T14:30Z	3.294	false
2020-01-17T14:15Z	3.309	false
2020-01-17T14:00Z	3.306	false
2020-01-17T13:45Z	3.285	false
2020-01-17T13:30Z	3.292	false
2020-01-17T13:15Z	3.295	false
2020-01-17T13:00Z	3.293	false
2020-01-17T12:45Z	3.287	false
2020-01-17T12:30Z	3.288	false
2020-01-17T12:15Z	3.291	false
2020-01-17T12:00Z	3.288	false
2020-01-17T11:45Z	3.293	false
2020-01-17T11:30Z	3.284	false
2020-01-17T11:15Z	3.266	false
2020-01-17T11:00Z	3.276	false
2020-01-17T10:45Z	3.276	false
2020-01-17T10:30Z	3.274	false
2020-01-17T10:15Z	3.274	false
2020-01-17T10:00Z	3.274	false
2020-01-17T09:45Z	3.27	false
2020-01-17T09:30Z	3.265	false
2020-01-17T09:15Z	3.257	false
2020-01-17T09:00Z	3.256	false
2020-01-17T08:45Z	3.261	false
2020-01-17T08:30Z	3.258	false
2020-01-17T08:15Z	3.244	false
2020-01-17T08:00Z	3.249	false
2020-01-17T07:45Z	3.235	false
2020-01-17T07:30Z	3.237	false
2020-01-17T07:15Z	3.238	false
2020-01-17T07:00Z	3.233	false
2020-01-17T06:45Z	3.246	false
2020-01-17T06:30Z	3.234	false
2020-01-17T06:15Z	3.223	false
2020-01-17T06:00Z	3.235	false
2020-01-17T05:45Z	3.217	false
2020-01-17T05:30Z	3.205	false
2020-01-17T05:15Z	3.215	false
2020-01-17T05:00Z	3.219	false
2020-01-17T04:45Z	3.214	false
2020-01-17T04:30Z	3.197	false
2020-01-17T04:15Z	3.209	false
2020-01-17T04:00Z	3.198	false
2020-01-17T03:45Z	3.195	false
2020-01-17T03:30Z	3.194	false
2020-01-17T03:15Z	3.206	false
2020-01-17T03:00Z	3.192	false
2020-01-17T02:45Z	3.197	false
2020-01-17T02:30Z	3.187	false
2020-01-17T02:15Z	3.185	false
2020-01-17T02:00Z	3.187	false
2020-01-17T01:45Z	3.18	false
2020-01-17T01:30Z	3.172	false
2020-01-17T01:15Z	3.181	false
2020-01-17T01:00Z	3.167	false
2020-01-17T00:45Z	3.169	false
2020-01-17T00:30Z	3.163	false
2020-01-17T00:15Z	3.16	false
2020-01-17T00:00Z	3.169	false
2020-01-16T23:45Z	3.159	false
2020-01-16T23:30Z	3.155	false
2020-01-16T23:15Z	3.16	false
2020-01-16T23:00Z	3.161	false
2020-01-16T22:45Z	3.15	false
2020-01-16T22:30Z	3.152	false
2020-01-16T22:15Z	3.159	false
2020-01-16T22:00Z	3.145	false
2020-01-16T21:45Z	3.158	false
2020-01-16T21:30Z	3.155	false
2020-01-16T21:15Z	3.147	false
2020-01-16T21:00Z	3.144	false
2020-01-16T20:45Z	3.137	false
2020-01-16T20:30Z	3.144	false
2020-01-16T20:15Z	3.138	false
2020-01-16T20:00Z	3.13	false
2020-01-16T19:45Z	3.125	false
2020-01-16T19:30Z	3.126	false
2020-01-16T19:15Z	3.126	false
2020-01-16T19:00Z	3.121	false
2020-01-16T18:45Z	3.133	false
2020-01-16T18:30Z	3.132	false
2020-01-16T18:15Z	3.122	false
2020-01-16T18:00Z	3.115	false
2020-01-16T17:45Z	3.123	false
2020-01-16T17:30Z	3.107	false
2020-01-16T17:15Z	3.104	false
2020-01-16T17:00Z	3.109	false
2020-01-16T16:45Z	3.104	false
2020-01-16T16:30Z	3.098	false
2020-01-16T16:15Z	3.102	false
2020-01-16T16:00Z	3.097	false
2020-01-16T15:45Z	3.111	false
2020-01-16T15:30Z	3.099	false
2020-01-16T15:15Z	3.097	false
2020-01-16T15:00Z	3.091	false
2020-01-16T14:45Z	3.105	false
2020-01-16T14:30Z	3.09	false
2020-01-16T14:15Z	3.088	false
2020-01-16T14:00Z	3.091	false
2020-01-16T13:45Z	3.09	false
2020-01-16T13:30Z	3.086	false
2020-01-16T13:15Z	3.085	false
2020-01-16T13:00Z	3.087	false
2020-01-16T12:45Z	3.079	false
2020-01-16T12:30Z	3.081	false
2020-01-16T12:15Z	3.071	false
2020-01-16T12:00Z	3.068	false
2020-01-16T11:45Z	3.081	false
2020-01-16T11:30Z	3.066	false
2020-01-16T11:15Z	3.08	false
2020-01-16T11:00Z	3.057	false
2020-01-16T10:45Z	3.084	false
2020-01-16T10:30Z	3.069	false
2020-01-16T10:15Z	3.063	false
2020-01-16T10:00Z	3.06	false
2020-01-16T09:45Z	3.062	false
2020-01-16T09:30Z	3.065	false
2020-01-16T09:15Z	3.059	false
2020-01-16T09:00Z	3.066	false
2020-01-16T08:45Z	3.06	false
2020-01-16T08:30Z	3.054	false
2020-01-16T08:15Z	3.057	false
2020-01-16T08:00Z	3.052	false
2020-01-16T07:45Z	3.055	false
2020-01-16T07:30Z	3.058	false
2020-01-16T07:15Z	3.047	false
2020-01-16T07:00Z	3.041	false
2020-01-16T06:45Z	3.058	false
2020-01-16T06:30Z	3.047	false
2020-01-16T06:15Z	3.05	false
2020-01-16T06:00Z	3.053	false
2020-01-16T05:45Z	3.032	false
2020-01-16T05:30Z	3.028	false
2020-01-16T05:15Z	3.028	false
2020-01-16T05:00Z	3.036	false
2020-01-16T04:45Z	3.024	false
2020-01-16T04:30Z	3.026	false
2020-01-16T04:15Z	3.037	false
2020-01-16T04:00Z	3.027	false
2020-01-16T03:45Z	3.032	false
2020-01-16T03:30Z	3.033	false
2020-01-16T03:15Z	3.032	false
2020-01-16T03:00Z	3.032	false
2020-01-16T02:45Z	3.03	false
2020-01-16T02:30Z	3.013	false
2020-01-16T02:15Z	3.027	false
2020-01-16T02:00Z	3.026	false
2020-01-16T01:45Z	3.018	false
2020-01-16T01:30Z	3.01	false
2020-01-16T01:15Z	3.019	false
2020-01-16T01:00Z	3.01	false
2020-01-16T00:45Z	3	false
2020-01-16T00:30Z	3.017	false
2020-01-16T00:15Z	3.021	false
2020-01-16T00:00Z	3.007	false
2020-01-15T23:45Z	3.011	false
2020-01-15T23:30Z	3.004	false
2020-01-15T23:15Z	3.008	false
2020-01-15T23:00Z	3.016	false
2020-01-15T22:45Z	3.006	false
2020-01-15T22:30Z	3.008	false
2020-01-15T22:15Z	3.021	false
2020-01-15T22:00Z	3.004	false
2020-01-15T21:45Z	3.005	false
2020-01-15T21:30Z	3.007	false
2020-01-15T21:15Z	3.009	false
2020-01-15T21:00Z	3.011	false
2020-01-15T20:45Z	3.013	false
2020-01-15T20:30Z	3.007	false
2020-01-15T20:15Z	3.005	false
2020-01-15T20:00Z	3.005	false
2020-01-15T19:45Z	3.004	false
2020-01-15T19:30Z	3.008	false
2020-01-15T19:15Z	3.006	false
2020-01-15T19:00Z	3.008	false
2020-01-15T18:45Z	3.009	false
2020-01-15T18:30Z	3.015	false
2020-01-15T18:15Z	3.011	false
2020-01-15T18:00Z	3.017	false
2020-01-15T17:45Z	3.002	false
2020-01-15T17:30Z	3.011	false
2020-01-15T17:15Z	3.011	false
2020-01-15T17:00Z	3.01	false
2020-01-15T16:45Z	3.002	false
2020-01-15T16:30Z	2.993	false
2020-01-15T16:15Z	3.011	false
2020-01-15T16:00Z	2.987	false
2020-01-15T15:45Z	3.003	false
2020-01-15T15:30Z	2.994	false
2020-01-15T15:15Z	3.002	false
2020-01-15T15:00Z	3.013	false
2020-01-15T14:45Z	2.985	false
2020-01-15T14:30Z	2.966	false
2020-01-15T14:15Z	2.967	false
2020-01-15T14:00Z	2.961	false
2020-01-15T13:45Z	2.971	false
2020-01-15T13:30Z	2.959	false
2020-01-15T13:15Z	2.952	false
2020-01-15T13:00Z	2.946	false
2020-01-15T12:45Z	2.96	false
2020-01-15T12:30Z	2.943	false
2020-01-15T12:15Z	2.965	false
2020-01-15T12:00Z	2.997	false
2020-01-15T11:45Z	2.961	false
2020-01-15T11:30Z	2.959	false
2020-01-15T11:15Z	2.964	false
2020-01-15T11:00Z	2.953	false
2020-01-15T10:45Z	2.938	false
2020-01-15T10:30Z	2.965	false
2020-01-15T10:15Z	2.964	false
2020-01-15T10:00Z	2.903	false
2020-01-15T09:45Z	2.878	false
2020-01-15T09:30Z	2.895	false
2020-01-15T09:15Z	2.881	false
2020-01-15T09:00Z	2.873	false
2020-01-15T08:45Z	2.889	false
2020-01-15T08:30Z	2.87	false
2020-01-15T08:15Z	2.879	false
2020-01-15T08:00Z	2.871	false
2020-01-15T07:45Z	2.874	false
2020-01-15T07:30Z	2.866	false
2020-01-15T07:15Z	2.861	false
2020-01-15T07:00Z	2.864	false
2020-01-15T06:45Z	2.869	false
2020-01-15T06:30Z	2.869	false
2020-01-15T06:15Z	2.847	false
2020-01-15T06:00Z	2.856	false
2020-01-15T05:45Z	2.863	false
2020-01-15T05:30Z	2.839	false
2020-01-15T05:15Z	2.868	false
2020-01-15T05:00Z	2.843	false
2020-01-15T04:45Z	2.848	false
2020-01-15T04:30Z	2.856	false
2020-01-15T04:15Z	2.826	false
2020-01-15T04:00Z	2.825	false
2020-01-15T03:45Z	2.834	false
2020-01-15T03:30Z	2.835	false
2020-01-15T03:15Z	2.822	false
2020-01-15T03:00Z	2.839	false
2020-01-15T02:45Z	2.825	false
2020-01-15T02:30Z	2.815	false
2020-01-15T02:15Z	2.828	false
2020-01-15T02:00Z	2.823	false
2020-01-15T01:45Z	2.819	false
2020-01-15T01:30Z	2.809	false
2020-01-15T01:15Z	2.805	false
2020-01-15T01:00Z	2.805	false
2020-01-15T00:45Z	2.799	false
2020-01-15T00:30Z	2.808	false
2020-01-15T00:15Z	2.804	false
2020-01-15T00:00Z	2.796	false
2020-01-14T23:45Z	2.802	false
2020-01-14T23:30Z	2.782	false
2020-01-14T23:15Z	2.802	false
2020-01-14T23:00Z	2.799	false
2020-01-14T22:45Z	2.779	false
2020-01-14T22:30Z	2.801	false
2020-01-14T22:15Z	2.788	false
2020-01-14T22:00Z	2.782	false
2020-01-14T21:45Z	2.78	false
2020-01-14T21:30Z	2.782	false
2020-01-14T21:15Z	2.762	false
2020-01-14T21:00Z	2.779	false
2020-01-14T20:45Z	2.795	false
2020-01-14T20:30Z	2.786	false
2020-01-14T20:15Z	2.774	false
2020-01-14T20:00Z	2.776	false
2020-01-14T19:45Z	2.795	false
2020-01-14T19:30Z	2.763	false
2020-01-14T19:15Z	2.772	false
2020-01-14T19:00Z	2.781	false
2020-01-14T18:45Z	2.769	false
2020-01-14T18:30Z	2.771	false
2020-01-14T18:15Z	2.761	false
2020-01-14T18:00Z	2.786	false
2020-01-14T17:45Z	2.773	false
2020-01-14T17:30Z	2.777	false
2020-01-14T17:15Z	2.779	false
2020-01-14T17:00Z	2.787	false
2020-01-14T16:45Z	2.766	false
2020-01-14T16:30Z	2.791	false
2020-01-14T16:15Z	2.786	false
2020-01-14T16:00Z	2.795	false
2020-01-14T15:45Z	2.798	false
2020-01-14T15:30Z	2.788	false
2020-01-14T15:15Z	2.787	false
2020-01-14T15:00Z	2.812	false
2020-01-14T14:45Z	2.808	false
2020-01-14T14:30Z	2.795	false
2020-01-14T14:15Z	2.801	false
2020-01-14T14:00Z	2.787	false
2020-01-14T13:45Z	2.804	false
2020-01-14T13:30Z	2.803	false
2020-01-14T13:15Z	2.817	false
2020-01-14T13:00Z	2.813	false
2020-01-14T12:45Z	2.814	false
2020-01-14T12:30Z	2.81	false
2020-01-14T12:15Z	2.797	false
2020-01-14T12:00Z	2.788	false
2020-01-14T11:45Z	2.765	false
2020-01-14T11:30Z	2.722	false
2020-01-14T11:15Z	2.71	false
2020-01-14T11:00Z	2.719	false
2020-01-14T10:45Z	2.713	false
2020-01-14T10:30Z	2.707	false
2020-01-14T10:15Z	2.71	false
2020-01-14T10:00Z	2.719	false
2020-01-14T09:45Z	2.701	false
2020-01-14T09:30Z	2.705	false
2020-01-14T09:15Z	2.709	false
2020-01-14T09:00Z	2.721	false
2020-01-14T08:45Z	2.692	false
2020-01-14T08:30Z	2.694	false
2020-01-14T08:15Z	2.705	false
2020-01-14T08:00Z	2.7	false
2020-01-14T07:45Z	2.703	false
2020-01-14T07:30Z	2.707	false
2020-01-14T07:15Z	2.689	false
2020-01-14T07:00Z	2.687	false
2020-01-14T06:45Z	2.691	false
2020-01-14T06:30Z	2.685	false
2020-01-14T06:15Z	2.687	false
2020-01-14T06:00Z	2.689	false
2020-01-14T05:45Z	2.691	false
2020-01-14T05:30Z	2.685	false
2020-01-14T05:15Z	2.697	false
2020-01-14T05:00Z	2.684	false
2020-01-14T04:45Z	2.683	false
2020-01-14T04:30Z	2.687	false
2020-01-14T04:15Z	2.685	false
2020-01-14T04:00Z	2.67	false
2020-01-14T03:45Z	2.678	false
2020-01-14T03:30Z	2.676	false
2020-01-14T03:15Z	2.684	false
2020-01-14T03:00Z	2.696	false
2020-01-14T02:45Z	2.683	false
2020-01-14T02:30Z	2.678	false
2020-01-14T02:15Z	2.684	false
2020-01-14T02:00Z	2.678	false
2020-01-14T01:45Z	2.677	false
2020-01-14T01:30Z	2.688	false
2020-01-14T01:15Z	2.672	false
2020-01-14T01:00Z	2.7	false
2020-01-14T00:45Z	2.688	false
2020-01-14T00:30Z	2.672	false
2020-01-14T00:15Z	2.68	false
2020-01-14T00:00Z	2.678	false
2020-01-13T23:45Z	2.677	false
2020-01-13T23:30Z	2.683	false
2020-01-13T23:15Z	2.683	false
2020-01-13T23:00Z	2.666	false
2020-01-13T22:45Z	2.671	false
2020-01-13T22:30Z	2.664	false
2020-01-13T22:15Z	2.681	false
2020-01-13T22:00Z	2.673	false
2020-01-13T21:45Z	2.667	false
2020-01-13T21:30Z	2.675	false
2020-01-13T21:15Z	2.669	false
2020-01-13T21:00Z	2.669	false
2020-01-13T20:45Z	2.659	false
2020-01-13T20:30Z	2.657	false
2020-01-13T20:15Z	2.656	false

Forecast data

Key information

• Station name: Marsh Lock (downstream)
• Station ID: 7155
• River name: River Thames
• Typical range: 2.30m to 3.02m
• Highest level on record: 4.28m on 09 February 2014
• Site datum: 28.45mAOD (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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