River level River Thames at Marsh Lock (upstream data)

Check for flood warnings in this area

Latest recorded level 0.23m at 8:00am Saturday 19 January 2019.

View downstream 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 0.40m 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
2019-01-19T08:00Z	0.231	false
2019-01-19T07:45Z	0.23	false
2019-01-19T07:30Z	0.231	false
2019-01-19T07:15Z	0.23	false
2019-01-19T07:00Z	0.231	false
2019-01-19T06:45Z	0.23	false
2019-01-19T06:30Z	0.231	false
2019-01-19T06:15Z	0.232	false
2019-01-19T06:00Z	0.231	false
2019-01-19T05:45Z	0.231	false
2019-01-19T05:30Z	0.231	false
2019-01-19T05:15Z	0.232	false
2019-01-19T05:00Z	0.232	false
2019-01-19T04:45Z	0.232	false
2019-01-19T04:30Z	0.232	false
2019-01-19T04:15Z	0.232	false
2019-01-19T04:00Z	0.232	false
2019-01-19T03:45Z	0.231	false
2019-01-19T03:30Z	0.232	false
2019-01-19T03:15Z	0.233	false
2019-01-19T03:00Z	0.232	false
2019-01-19T02:45Z	0.233	false
2019-01-19T02:30Z	0.234	false
2019-01-19T02:15Z	0.234	false
2019-01-19T02:00Z	0.234	false
2019-01-19T01:45Z	0.236	false
2019-01-19T01:30Z	0.237	false
2019-01-19T01:15Z	0.234	false
2019-01-19T01:00Z	0.237	false
2019-01-19T00:45Z	0.236	false
2019-01-19T00:30Z	0.236	false
2019-01-19T00:15Z	0.237	false
2019-01-19T00:00Z	0.237	false
2019-01-18T23:45Z	0.236	false
2019-01-18T23:30Z	0.238	false
2019-01-18T23:15Z	0.238	false
2019-01-18T23:00Z	0.237	false
2019-01-18T22:45Z	0.237	false
2019-01-18T22:30Z	0.237	false
2019-01-18T22:15Z	0.238	false
2019-01-18T22:00Z	0.238	false
2019-01-18T21:45Z	0.239	false
2019-01-18T21:30Z	0.238	false
2019-01-18T21:15Z	0.238	false
2019-01-18T21:00Z	0.239	false
2019-01-18T20:45Z	0.239	false
2019-01-18T20:30Z	0.241	false
2019-01-18T20:15Z	0.239	false
2019-01-18T20:00Z	0.239	false
2019-01-18T19:45Z	0.238	false
2019-01-18T19:30Z	0.239	false
2019-01-18T19:15Z	0.239	false
2019-01-18T19:00Z	0.237	false
2019-01-18T18:45Z	0.238	false
2019-01-18T18:30Z	0.238	false
2019-01-18T18:15Z	0.238	false
2019-01-18T18:00Z	0.239	false
2019-01-18T17:45Z	0.239	false
2019-01-18T17:30Z	0.239	false
2019-01-18T17:15Z	0.239	false
2019-01-18T17:00Z	0.241	false
2019-01-18T16:45Z	0.24	false
2019-01-18T16:30Z	0.24	false
2019-01-18T16:15Z	0.239	false
2019-01-18T16:00Z	0.241	false
2019-01-18T15:45Z	0.242	false
2019-01-18T15:30Z	0.241	false
2019-01-18T15:15Z	0.241	false
2019-01-18T15:00Z	0.242	false
2019-01-18T14:45Z	0.238	false
2019-01-18T14:30Z	0.238	false
2019-01-18T14:15Z	0.24	false
2019-01-18T14:00Z	0.241	false
2019-01-18T13:45Z	0.238	false
2019-01-18T13:30Z	0.238	false
2019-01-18T13:15Z	0.239	false
2019-01-18T13:00Z	0.238	false
2019-01-18T12:45Z	0.238	false
2019-01-18T12:30Z	0.237	false
2019-01-18T12:15Z	0.236	false
2019-01-18T12:00Z	0.236	false
2019-01-18T11:45Z	0.233	false
2019-01-18T11:30Z	0.235	false
2019-01-18T11:15Z	0.235	false
2019-01-18T11:00Z	0.235	false
2019-01-18T10:45Z	0.235	false
2019-01-18T10:30Z	0.234	false
2019-01-18T10:15Z	0.234	false
2019-01-18T10:00Z	0.234	false
2019-01-18T09:45Z	0.233	false
2019-01-18T09:30Z	0.234	false
2019-01-18T09:15Z	0.234	false
2019-01-18T09:00Z	0.234	false
2019-01-18T08:45Z	0.234	false
2019-01-18T08:30Z	0.233	false
2019-01-18T08:15Z	0.233	false
2019-01-18T08:00Z	0.234	false
2019-01-18T07:45Z	0.233	false
2019-01-18T07:30Z	0.233	false
2019-01-18T07:15Z	0.234	false
2019-01-18T07:00Z	0.234	false
2019-01-18T06:45Z	0.234	false
2019-01-18T06:30Z	0.234	false
2019-01-18T06:15Z	0.236	false
2019-01-18T06:00Z	0.236	false
2019-01-18T05:45Z	0.236	false
2019-01-18T05:30Z	0.236	false
2019-01-18T05:15Z	0.236	false
2019-01-18T05:00Z	0.237	false
2019-01-18T04:45Z	0.238	false
2019-01-18T04:30Z	0.238	false
2019-01-18T04:15Z	0.24	false
2019-01-18T04:00Z	0.239	false
2019-01-18T03:45Z	0.24	false
2019-01-18T03:30Z	0.24	false
2019-01-18T03:15Z	0.241	false
2019-01-18T03:00Z	0.241	false
2019-01-18T02:45Z	0.241	false
2019-01-18T02:30Z	0.241	false
2019-01-18T02:15Z	0.243	false
2019-01-18T02:00Z	0.244	false
2019-01-18T01:45Z	0.243	false
2019-01-18T01:30Z	0.244	false
2019-01-18T01:15Z	0.245	false
2019-01-18T01:00Z	0.246	false
2019-01-18T00:45Z	0.246	false
2019-01-18T00:30Z	0.248	false
2019-01-18T00:15Z	0.248	false
2019-01-18T00:00Z	0.249	false
2019-01-17T23:45Z	0.249	false
2019-01-17T23:30Z	0.25	false
2019-01-17T23:15Z	0.251	false
2019-01-17T23:00Z	0.251	false
2019-01-17T22:45Z	0.252	false
2019-01-17T22:30Z	0.252	false
2019-01-17T22:15Z	0.252	false
2019-01-17T22:00Z	0.254	false
2019-01-17T21:45Z	0.254	false
2019-01-17T21:30Z	0.254	false
2019-01-17T21:15Z	0.254	false
2019-01-17T21:00Z	0.255	false
2019-01-17T20:45Z	0.255	false
2019-01-17T20:30Z	0.255	false
2019-01-17T20:15Z	0.256	false
2019-01-17T20:00Z	0.257	false
2019-01-17T19:45Z	0.257	false
2019-01-17T19:30Z	0.257	false
2019-01-17T19:15Z	0.257	false
2019-01-17T19:00Z	0.257	false
2019-01-17T18:45Z	0.257	false
2019-01-17T18:30Z	0.257	false
2019-01-17T18:15Z	0.258	false
2019-01-17T18:00Z	0.258	false
2019-01-17T17:45Z	0.258	false
2019-01-17T17:30Z	0.258	false
2019-01-17T17:15Z	0.26	false
2019-01-17T17:00Z	0.26	false
2019-01-17T16:45Z	0.26	false
2019-01-17T16:30Z	0.261	false
2019-01-17T16:15Z	0.26	false
2019-01-17T16:00Z	0.261	false
2019-01-17T15:45Z	0.26	false
2019-01-17T15:30Z	0.26	false
2019-01-17T15:15Z	0.259	false
2019-01-17T15:00Z	0.26	false
2019-01-17T14:45Z	0.259	false
2019-01-17T14:30Z	0.259	false
2019-01-17T14:15Z	0.258	false
2019-01-17T14:00Z	0.258	false
2019-01-17T13:45Z	0.257	false
2019-01-17T13:30Z	0.258	false
2019-01-17T13:15Z	0.259	false
2019-01-17T13:00Z	0.257	false
2019-01-17T12:45Z	0.254	false
2019-01-17T12:30Z	0.256	false
2019-01-17T12:15Z	0.255	false
2019-01-17T12:00Z	0.254	false
2019-01-17T11:45Z	0.254	false
2019-01-17T11:30Z	0.254	false
2019-01-17T11:15Z	0.252	false
2019-01-17T11:00Z	0.252	false
2019-01-17T10:45Z	0.252	false
2019-01-17T10:30Z	0.251	false
2019-01-17T10:15Z	0.25	false
2019-01-17T10:00Z	0.25	false
2019-01-17T09:45Z	0.25	false
2019-01-17T09:30Z	0.249	false
2019-01-17T09:15Z	0.248	false
2019-01-17T09:00Z	0.247	false
2019-01-17T08:45Z	0.246	false
2019-01-17T08:30Z	0.245	false
2019-01-17T08:15Z	0.245	false
2019-01-17T08:00Z	0.241	false
2019-01-17T07:45Z	0.244	false
2019-01-17T07:30Z	0.242	false
2019-01-17T07:15Z	0.243	false
2019-01-17T07:00Z	0.242	false
2019-01-17T06:45Z	0.243	false
2019-01-17T06:30Z	0.243	false
2019-01-17T06:15Z	0.243	false
2019-01-17T06:00Z	0.242	false
2019-01-17T05:45Z	0.242	false
2019-01-17T05:30Z	0.242	false
2019-01-17T05:15Z	0.241	false
2019-01-17T05:00Z	0.241	false
2019-01-17T04:45Z	0.24	false
2019-01-17T04:30Z	0.241	false
2019-01-17T04:15Z	0.241	false
2019-01-17T04:00Z	0.241	false
2019-01-17T03:45Z	0.242	false
2019-01-17T03:30Z	0.241	false
2019-01-17T03:15Z	0.24	false
2019-01-17T03:00Z	0.24	false
2019-01-17T02:45Z	0.24	false
2019-01-17T02:30Z	0.241	false
2019-01-17T02:15Z	0.241	false
2019-01-17T02:00Z	0.242	false
2019-01-17T01:45Z	0.243	false
2019-01-17T01:30Z	0.243	false
2019-01-17T01:15Z	0.243	false
2019-01-17T01:00Z	0.244	false
2019-01-17T00:45Z	0.245	false
2019-01-17T00:30Z	0.245	false
2019-01-17T00:15Z	0.246	false
2019-01-17T00:00Z	0.247	false
2019-01-16T23:45Z	0.247	false
2019-01-16T23:30Z	0.248	false
2019-01-16T23:15Z	0.248	false
2019-01-16T23:00Z	0.249	false
2019-01-16T22:45Z	0.249	false
2019-01-16T22:30Z	0.25	false
2019-01-16T22:15Z	0.25	false
2019-01-16T22:00Z	0.25	false
2019-01-16T21:45Z	0.251	false
2019-01-16T21:30Z	0.25	false
2019-01-16T21:15Z	0.251	false
2019-01-16T21:00Z	0.251	false
2019-01-16T20:45Z	0.252	false
2019-01-16T20:30Z	0.253	false
2019-01-16T20:15Z	0.252	false
2019-01-16T20:00Z	0.252	false
2019-01-16T19:45Z	0.251	false
2019-01-16T19:30Z	0.252	false
2019-01-16T19:15Z	0.252	false
2019-01-16T19:00Z	0.251	false
2019-01-16T18:45Z	0.253	false
2019-01-16T18:30Z	0.252	false
2019-01-16T18:15Z	0.252	false
2019-01-16T18:00Z	0.252	false
2019-01-16T17:45Z	0.251	false
2019-01-16T17:30Z	0.251	false
2019-01-16T17:15Z	0.251	false
2019-01-16T17:00Z	0.251	false
2019-01-16T16:45Z	0.251	false
2019-01-16T16:30Z	0.25	false
2019-01-16T16:15Z	0.251	false
2019-01-16T16:00Z	0.251	false
2019-01-16T15:45Z	0.251	false
2019-01-16T15:30Z	0.251	false
2019-01-16T15:15Z	0.248	false
2019-01-16T15:00Z	0.249	false
2019-01-16T14:45Z	0.248	false
2019-01-16T14:30Z	0.25	false
2019-01-16T14:15Z	0.251	false
2019-01-16T14:00Z	0.25	false
2019-01-16T13:45Z	0.248	false
2019-01-16T13:30Z	0.248	false
2019-01-16T13:15Z	0.247	false
2019-01-16T13:00Z	0.244	false
2019-01-16T12:45Z	0.241	false
2019-01-16T12:30Z	0.232	false
2019-01-16T12:15Z	0.232	false
2019-01-16T12:00Z	0.229	false
2019-01-16T11:45Z	0.231	false
2019-01-16T11:30Z	0.228	false
2019-01-16T11:15Z	0.227	false
2019-01-16T11:00Z	0.226	false
2019-01-16T10:45Z	0.226	false
2019-01-16T10:30Z	0.226	false
2019-01-16T10:15Z	0.227	false
2019-01-16T10:00Z	0.225	false
2019-01-16T09:45Z	0.226	false
2019-01-16T09:30Z	0.225	false
2019-01-16T09:15Z	0.225	false
2019-01-16T09:00Z	0.225	false
2019-01-16T08:45Z	0.225	false
2019-01-16T08:30Z	0.223	false
2019-01-16T08:15Z	0.223	false
2019-01-16T08:00Z	0.223	false
2019-01-16T07:45Z	0.223	false
2019-01-16T07:30Z	0.222	false
2019-01-16T07:15Z	0.221	false
2019-01-16T07:00Z	0.221	false
2019-01-16T06:45Z	0.222	false
2019-01-16T06:30Z	0.221	false
2019-01-16T06:15Z	0.22	false
2019-01-16T06:00Z	0.22	false
2019-01-16T05:45Z	0.221	false
2019-01-16T05:30Z	0.22	false
2019-01-16T05:15Z	0.22	false
2019-01-16T05:00Z	0.221	false
2019-01-16T04:45Z	0.219	false
2019-01-16T04:30Z	0.22	false
2019-01-16T04:15Z	0.219	false
2019-01-16T04:00Z	0.219	false
2019-01-16T03:45Z	0.219	false
2019-01-16T03:30Z	0.22	false
2019-01-16T03:15Z	0.218	false
2019-01-16T03:00Z	0.218	false
2019-01-16T02:45Z	0.218	false
2019-01-16T02:30Z	0.217	false
2019-01-16T02:15Z	0.216	false
2019-01-16T02:00Z	0.218	false
2019-01-16T01:45Z	0.216	false
2019-01-16T01:30Z	0.216	false
2019-01-16T01:15Z	0.215	false
2019-01-16T01:00Z	0.216	false
2019-01-16T00:45Z	0.214	false
2019-01-16T00:30Z	0.214	false
2019-01-16T00:15Z	0.214	false
2019-01-16T00:00Z	0.213	false
2019-01-15T23:45Z	0.212	false
2019-01-15T23:30Z	0.213	false
2019-01-15T23:15Z	0.211	false
2019-01-15T23:00Z	0.209	false
2019-01-15T22:45Z	0.209	false
2019-01-15T22:30Z	0.208	false
2019-01-15T22:15Z	0.207	false
2019-01-15T22:00Z	0.206	false
2019-01-15T21:45Z	0.204	false
2019-01-15T21:30Z	0.204	false
2019-01-15T21:15Z	0.202	false
2019-01-15T21:00Z	0.202	false
2019-01-15T20:45Z	0.199	false
2019-01-15T20:30Z	0.197	false
2019-01-15T20:15Z	0.196	false
2019-01-15T20:00Z	0.193	false
2019-01-15T19:45Z	0.193	false
2019-01-15T19:30Z	0.19	false
2019-01-15T19:15Z	0.189	false
2019-01-15T19:00Z	0.187	false
2019-01-15T18:45Z	0.186	false
2019-01-15T18:30Z	0.185	false
2019-01-15T18:15Z	0.184	false
2019-01-15T18:00Z	0.182	false
2019-01-15T17:45Z	0.18	false
2019-01-15T17:30Z	0.181	false
2019-01-15T17:15Z	0.179	false
2019-01-15T17:00Z	0.178	false
2019-01-15T16:45Z	0.178	false
2019-01-15T16:30Z	0.177	false
2019-01-15T16:15Z	0.177	false
2019-01-15T16:00Z	0.179	false
2019-01-15T15:45Z	0.18	false
2019-01-15T15:30Z	0.183	false
2019-01-15T15:15Z	0.186	false
2019-01-15T15:00Z	0.194	false
2019-01-15T14:45Z	0.2	false
2019-01-15T14:30Z	0.215	false
2019-01-15T14:15Z	0.216	false
2019-01-15T14:00Z	0.218	false
2019-01-15T13:45Z	0.222	false
2019-01-15T13:30Z	0.224	false
2019-01-15T13:15Z	0.225	false
2019-01-15T13:00Z	0.228	false
2019-01-15T12:45Z	0.227	false
2019-01-15T12:30Z	0.227	false
2019-01-15T12:15Z	0.228	false
2019-01-15T12:00Z	0.229	false
2019-01-15T11:45Z	0.228	false
2019-01-15T11:30Z	0.227	false
2019-01-15T11:15Z	0.226	false
2019-01-15T11:00Z	0.225	false
2019-01-15T10:45Z	0.227	false
2019-01-15T10:30Z	0.227	false
2019-01-15T10:15Z	0.227	false
2019-01-15T10:00Z	0.229	false
2019-01-15T09:45Z	0.227	false
2019-01-15T09:30Z	0.228	false
2019-01-15T09:15Z	0.228	false
2019-01-15T09:00Z	0.228	false
2019-01-15T08:45Z	0.228	false
2019-01-15T08:30Z	0.227	false
2019-01-15T08:15Z	0.229	false
2019-01-15T08:00Z	0.229	false
2019-01-15T07:45Z	0.229	false
2019-01-15T07:30Z	0.229	false
2019-01-15T07:15Z	0.23	false
2019-01-15T07:00Z	0.23	false
2019-01-15T06:45Z	0.231	false
2019-01-15T06:30Z	0.232	false
2019-01-15T06:15Z	0.232	false
2019-01-15T06:00Z	0.232	false
2019-01-15T05:45Z	0.233	false
2019-01-15T05:30Z	0.233	false
2019-01-15T05:15Z	0.234	false
2019-01-15T05:00Z	0.234	false
2019-01-15T04:45Z	0.234	false
2019-01-15T04:30Z	0.235	false
2019-01-15T04:15Z	0.236	false
2019-01-15T04:00Z	0.236	false
2019-01-15T03:45Z	0.237	false
2019-01-15T03:30Z	0.237	false
2019-01-15T03:15Z	0.237	false
2019-01-15T03:00Z	0.237	false
2019-01-15T02:45Z	0.24	false
2019-01-15T02:30Z	0.238	false
2019-01-15T02:15Z	0.238	false
2019-01-15T02:00Z	0.239	false
2019-01-15T01:45Z	0.239	false
2019-01-15T01:30Z	0.24	false
2019-01-15T01:15Z	0.24	false
2019-01-15T01:00Z	0.24	false
2019-01-15T00:45Z	0.24	false
2019-01-15T00:30Z	0.241	false
2019-01-15T00:15Z	0.241	false
2019-01-15T00:00Z	0.241	false
2019-01-14T23:45Z	0.241	false
2019-01-14T23:30Z	0.241	false
2019-01-14T23:15Z	0.243	false
2019-01-14T23:00Z	0.242	false
2019-01-14T22:45Z	0.243	false
2019-01-14T22:30Z	0.243	false
2019-01-14T22:15Z	0.243	false
2019-01-14T22:00Z	0.243	false
2019-01-14T21:45Z	0.243	false
2019-01-14T21:30Z	0.243	false
2019-01-14T21:15Z	0.244	false
2019-01-14T21:00Z	0.245	false
2019-01-14T20:45Z	0.245	false
2019-01-14T20:30Z	0.245	false
2019-01-14T20:15Z	0.245	false
2019-01-14T20:00Z	0.246	false
2019-01-14T19:45Z	0.246	false
2019-01-14T19:30Z	0.247	false
2019-01-14T19:15Z	0.247	false
2019-01-14T19:00Z	0.247	false
2019-01-14T18:45Z	0.247	false
2019-01-14T18:30Z	0.249	false
2019-01-14T18:15Z	0.248	false
2019-01-14T18:00Z	0.248	false
2019-01-14T17:45Z	0.25	false
2019-01-14T17:30Z	0.249	false
2019-01-14T17:15Z	0.25	false
2019-01-14T17:00Z	0.251	false
2019-01-14T16:45Z	0.25	false
2019-01-14T16:30Z	0.25	false
2019-01-14T16:15Z	0.251	false
2019-01-14T16:00Z	0.251	false
2019-01-14T15:45Z	0.25	false
2019-01-14T15:30Z	0.251	false
2019-01-14T15:15Z	0.25	false
2019-01-14T15:00Z	0.248	false
2019-01-14T14:45Z	0.249	false
2019-01-14T14:30Z	0.248	false
2019-01-14T14:15Z	0.245	false
2019-01-14T14:00Z	0.247	false
2019-01-14T13:45Z	0.249	false
2019-01-14T13:30Z	0.247	false
2019-01-14T13:15Z	0.248	false
2019-01-14T13:00Z	0.248	false
2019-01-14T12:45Z	0.247	false
2019-01-14T12:30Z	0.249	false
2019-01-14T12:15Z	0.249	false
2019-01-14T12:00Z	0.248	false
2019-01-14T11:45Z	0.248	false
2019-01-14T11:30Z	0.248	false
2019-01-14T11:15Z	0.246	false
2019-01-14T11:00Z	0.247	false
2019-01-14T10:45Z	0.246	false
2019-01-14T10:30Z	0.246	false
2019-01-14T10:15Z	0.247	false
2019-01-14T10:00Z	0.237	false
2019-01-14T09:45Z	0.247	false
2019-01-14T09:30Z	0.247	false
2019-01-14T09:15Z	0.246	false
2019-01-14T09:00Z	0.246	false
2019-01-14T08:45Z	0.245	false
2019-01-14T08:30Z	0.245	false
2019-01-14T08:15Z	0.245	false

Forecast data

Key information

• Station name: Marsh Lock (upstream)
• Station ID: 7155
• River name: River Thames
• Typical range: 0.11m to 0.40m
• Highest level on record: 1.63m on 01 November 2001
• Site datum: 31.97mAOD (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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