River level River Thames at Marsh Lock (upstream data)

Check for flood warnings in this area

Latest recorded level 0.19m at 2:00pm Thursday 18 July 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
▼

• 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

You're missing out. A graph should be visible here.
Upgrade your browser to see and use all the features of this service.

You're missing out. A graph should be visible here.

Javascript must be enabled.

Observed data

DateTime	Value	Error
2019-07-18T13:00Z	0.186	false
2019-07-18T12:45Z	0.187	false
2019-07-18T12:30Z	0.19	false
2019-07-18T12:15Z	0.185	false
2019-07-18T12:00Z	0.19	false
2019-07-18T11:45Z	0.185	false
2019-07-18T11:30Z	0.186	false
2019-07-18T11:15Z	0.186	false
2019-07-18T11:00Z	0.184	false
2019-07-18T10:45Z	0.185	false
2019-07-18T10:30Z	0.19	false
2019-07-18T10:15Z	0.179	false
2019-07-18T10:00Z	0.184	false
2019-07-18T09:45Z	0.183	false
2019-07-18T09:30Z	0.182	false
2019-07-18T09:15Z	0.182	false
2019-07-18T09:00Z	0.183	false
2019-07-18T08:45Z	0.183	false
2019-07-18T08:30Z	0.183	false
2019-07-18T08:15Z	0.184	false
2019-07-18T08:00Z	0.181	false
2019-07-18T07:45Z	0.182	false
2019-07-18T07:30Z	0.183	false
2019-07-18T07:15Z	0.179	false
2019-07-18T07:00Z	0.177	false
2019-07-18T06:45Z	0.177	false
2019-07-18T06:30Z	0.176	false
2019-07-18T06:15Z	0.177	false
2019-07-18T06:00Z	0.176	false
2019-07-18T05:45Z	0.177	false
2019-07-18T05:30Z	0.176	false
2019-07-18T05:15Z	0.175	false
2019-07-18T05:00Z	0.175	false
2019-07-18T04:45Z	0.176	false
2019-07-18T04:30Z	0.176	false
2019-07-18T04:15Z	0.176	false
2019-07-18T04:00Z	0.176	false
2019-07-18T03:45Z	0.176	false
2019-07-18T03:30Z	0.176	false
2019-07-18T03:15Z	0.176	false
2019-07-18T03:00Z	0.176	false
2019-07-18T02:45Z	0.176	false
2019-07-18T02:30Z	0.176	false
2019-07-18T02:15Z	0.176	false
2019-07-18T02:00Z	0.176	false
2019-07-18T01:45Z	0.176	false
2019-07-18T01:30Z	0.176	false
2019-07-18T01:15Z	0.177	false
2019-07-18T01:00Z	0.176	false
2019-07-18T00:45Z	0.177	false
2019-07-18T00:30Z	0.176	false
2019-07-18T00:15Z	0.175	false
2019-07-18T00:00Z	0.176	false
2019-07-17T23:45Z	0.175	false
2019-07-17T23:30Z	0.176	false
2019-07-17T23:15Z	0.175	false
2019-07-17T23:00Z	0.175	false
2019-07-17T22:45Z	0.174	false
2019-07-17T22:30Z	0.174	false
2019-07-17T22:15Z	0.174	false
2019-07-17T22:00Z	0.174	false
2019-07-17T21:45Z	0.173	false
2019-07-17T21:30Z	0.172	false
2019-07-17T21:15Z	0.172	false
2019-07-17T21:00Z	0.172	false
2019-07-17T20:45Z	0.165	false
2019-07-17T20:30Z	0.174	false
2019-07-17T20:15Z	0.174	false
2019-07-17T20:00Z	0.172	false
2019-07-17T19:45Z	0.173	false
2019-07-17T19:30Z	0.171	false
2019-07-17T19:15Z	0.171	false
2019-07-17T19:00Z	0.173	false
2019-07-17T18:45Z	0.175	false
2019-07-17T18:30Z	0.173	false
2019-07-17T18:15Z	0.171	false
2019-07-17T18:00Z	0.175	false
2019-07-17T17:45Z	0.175	false
2019-07-17T17:30Z	0.174	false
2019-07-17T17:15Z	0.17	false
2019-07-17T17:00Z	0.171	false
2019-07-17T16:45Z	0.176	false
2019-07-17T16:30Z	0.173	false
2019-07-17T16:15Z	0.162	false
2019-07-17T16:00Z	0.177	false
2019-07-17T15:45Z	0.179	false
2019-07-17T15:30Z	0.174	false
2019-07-17T15:15Z	0.172	false
2019-07-17T15:00Z	0.174	false
2019-07-17T14:45Z	0.171	false
2019-07-17T14:30Z	0.176	false
2019-07-17T14:15Z	0.17	false
2019-07-17T14:00Z	0.169	false
2019-07-17T13:45Z	0.176	false
2019-07-17T13:30Z	0.156	false
2019-07-17T13:15Z	0.172	false
2019-07-17T13:00Z	0.173	false
2019-07-17T12:45Z	0.171	false
2019-07-17T12:30Z	0.177	false
2019-07-17T12:15Z	0.171	false
2019-07-17T12:00Z	0.172	false
2019-07-17T11:45Z	0.169	false
2019-07-17T11:30Z	0.172	false
2019-07-17T11:15Z	0.153	false
2019-07-17T11:00Z	0.173	false
2019-07-17T10:45Z	0.176	false
2019-07-17T10:30Z	0.169	false
2019-07-17T10:15Z	0.164	false
2019-07-17T10:00Z	0.174	false
2019-07-17T09:45Z	0.17	false
2019-07-17T09:30Z	0.173	false
2019-07-17T09:15Z	0.176	false
2019-07-17T09:00Z	0.177	false
2019-07-17T08:45Z	0.179	false
2019-07-17T08:30Z	0.177	false
2019-07-17T08:15Z	0.178	false
2019-07-17T08:00Z	0.177	false
2019-07-17T07:45Z	0.176	false
2019-07-17T07:30Z	0.175	false
2019-07-17T07:15Z	0.176	false
2019-07-17T07:00Z	0.176	false
2019-07-17T06:45Z	0.176	false
2019-07-17T06:30Z	0.176	false
2019-07-17T06:15Z	0.176	false
2019-07-17T06:00Z	0.177	false
2019-07-17T05:45Z	0.178	false
2019-07-17T05:30Z	0.177	false
2019-07-17T05:15Z	0.178	false
2019-07-17T05:00Z	0.178	false
2019-07-17T04:45Z	0.177	false
2019-07-17T04:30Z	0.178	false
2019-07-17T04:15Z	0.177	false
2019-07-17T04:00Z	0.178	false
2019-07-17T03:45Z	0.178	false
2019-07-17T03:30Z	0.178	false
2019-07-17T03:15Z	0.178	false
2019-07-17T03:00Z	0.178	false
2019-07-17T02:45Z	0.178	false
2019-07-17T02:30Z	0.178	false
2019-07-17T02:15Z	0.178	false
2019-07-17T02:00Z	0.179	false
2019-07-17T01:45Z	0.179	false
2019-07-17T01:30Z	0.178	false
2019-07-17T01:15Z	0.178	false
2019-07-17T01:00Z	0.178	false
2019-07-17T00:45Z	0.178	false
2019-07-17T00:30Z	0.178	false
2019-07-17T00:15Z	0.178	false
2019-07-17T00:00Z	0.177	false
2019-07-16T23:45Z	0.177	false
2019-07-16T23:30Z	0.178	false
2019-07-16T23:15Z	0.177	false
2019-07-16T23:00Z	0.176	false
2019-07-16T22:45Z	0.176	false
2019-07-16T22:30Z	0.175	false
2019-07-16T22:15Z	0.175	false
2019-07-16T22:00Z	0.178	false
2019-07-16T21:45Z	0.174	false
2019-07-16T21:30Z	0.171	false
2019-07-16T21:15Z	0.174	false
2019-07-16T21:00Z	0.178	false
2019-07-16T20:45Z	0.175	false
2019-07-16T20:30Z	0.172	false
2019-07-16T20:15Z	0.174	false
2019-07-16T20:00Z	0.172	false
2019-07-16T19:45Z	0.172	false
2019-07-16T19:30Z	0.178	false
2019-07-16T19:15Z	0.173	false
2019-07-16T19:00Z	0.174	false
2019-07-16T18:45Z	0.172	false
2019-07-16T18:30Z	0.176	false
2019-07-16T18:15Z	0.171	false
2019-07-16T18:00Z	0.174	false
2019-07-16T17:45Z	0.172	false
2019-07-16T17:30Z	0.175	false
2019-07-16T17:15Z	0.166	false
2019-07-16T17:00Z	0.174	false
2019-07-16T16:45Z	0.176	false
2019-07-16T16:30Z	0.171	false
2019-07-16T16:15Z	0.175	false
2019-07-16T16:00Z	0.179	false
2019-07-16T15:45Z	0.176	false
2019-07-16T15:30Z	0.171	false
2019-07-16T15:15Z	0.177	false
2019-07-16T15:00Z	0.174	false
2019-07-16T14:45Z	0.175	false
2019-07-16T14:30Z	0.176	false
2019-07-16T14:15Z	0.173	false
2019-07-16T14:00Z	0.173	false
2019-07-16T13:45Z	0.167	false
2019-07-16T13:30Z	0.17	false
2019-07-16T13:15Z	0.174	false
2019-07-16T13:00Z	0.176	false
2019-07-16T12:45Z	0.176	false
2019-07-16T12:30Z	0.173	false
2019-07-16T12:15Z	0.173	false
2019-07-16T12:00Z	0.174	false
2019-07-16T11:45Z	0.173	false
2019-07-16T11:30Z	0.177	false
2019-07-16T11:15Z	0.18	false
2019-07-16T11:00Z	0.178	false
2019-07-16T10:45Z	0.174	false
2019-07-16T10:30Z	0.175	false
2019-07-16T10:15Z	0.174	false
2019-07-16T10:00Z	0.168	false
2019-07-16T09:45Z	0.174	false
2019-07-16T09:30Z	0.175	false
2019-07-16T09:15Z	0.172	false
2019-07-16T09:00Z	0.175	false
2019-07-16T08:45Z	0.175	false
2019-07-16T08:30Z	0.172	false
2019-07-16T08:15Z	0.171	false
2019-07-16T08:00Z	0.171	false
2019-07-16T07:45Z	0.171	false
2019-07-16T07:30Z	0.171	false
2019-07-16T07:15Z	0.169	false
2019-07-16T07:00Z	0.171	false
2019-07-16T06:45Z	0.17	false
2019-07-16T06:30Z	0.172	false
2019-07-16T06:15Z	0.171	false
2019-07-16T06:00Z	0.17	false
2019-07-16T05:45Z	0.172	false
2019-07-16T05:30Z	0.17	false
2019-07-16T05:15Z	0.171	false
2019-07-16T05:00Z	0.17	false
2019-07-16T04:45Z	0.171	false
2019-07-16T04:30Z	0.171	false
2019-07-16T04:15Z	0.171	false
2019-07-16T04:00Z	0.171	false
2019-07-16T03:45Z	0.17	false
2019-07-16T03:30Z	0.17	false
2019-07-16T03:15Z	0.17	false
2019-07-16T03:00Z	0.169	false
2019-07-16T02:45Z	0.169	false
2019-07-16T02:30Z	0.168	false
2019-07-16T02:15Z	0.168	false
2019-07-16T02:00Z	0.168	false
2019-07-16T01:45Z	0.166	false
2019-07-16T01:30Z	0.165	false
2019-07-16T01:15Z	0.165	false
2019-07-16T01:00Z	0.164	false
2019-07-16T00:45Z	0.164	false
2019-07-16T00:30Z	0.162	false
2019-07-16T00:15Z	0.162	false
2019-07-16T00:00Z	0.161	false
2019-07-15T23:45Z	0.16	false
2019-07-15T23:30Z	0.16	false
2019-07-15T23:15Z	0.159	false
2019-07-15T23:00Z	0.157	false
2019-07-15T22:45Z	0.158	false
2019-07-15T22:30Z	0.156	false
2019-07-15T22:15Z	0.155	false
2019-07-15T22:00Z	0.154	false
2019-07-15T21:45Z	0.154	false
2019-07-15T21:30Z	0.155	false
2019-07-15T21:15Z	0.147	false
2019-07-15T21:00Z	0.155	false
2019-07-15T20:45Z	0.155	false
2019-07-15T20:30Z	0.158	false
2019-07-15T20:15Z	0.158	false
2019-07-15T20:00Z	0.156	false
2019-07-15T19:45Z	0.158	false
2019-07-15T19:30Z	0.159	false
2019-07-15T19:15Z	0.156	false
2019-07-15T19:00Z	0.157	false
2019-07-15T18:45Z	0.158	false
2019-07-15T18:30Z	0.156	false
2019-07-15T18:15Z	0.156	false
2019-07-15T18:00Z	0.156	false
2019-07-15T17:45Z	0.156	false
2019-07-15T17:30Z	0.155	false
2019-07-15T17:15Z	0.157	false
2019-07-15T17:00Z	0.16	false
2019-07-15T16:45Z	0.158	false
2019-07-15T16:30Z	0.162	false
2019-07-15T16:15Z	0.158	false
2019-07-15T16:00Z	0.16	false
2019-07-15T15:45Z	0.162	false
2019-07-15T15:30Z	0.162	false
2019-07-15T15:15Z	0.162	false
2019-07-15T15:00Z	0.154	false
2019-07-15T14:45Z	0.163	false
2019-07-15T14:30Z	0.172	false
2019-07-15T14:15Z	0.173	false
2019-07-15T14:00Z	0.175	false
2019-07-15T13:45Z	0.18	false
2019-07-15T13:30Z	0.178	false
2019-07-15T13:15Z	0.185	false
2019-07-15T13:00Z	0.194	false
2019-07-15T12:45Z	0.195	false
2019-07-15T12:30Z	0.198	false
2019-07-15T12:15Z	0.198	false
2019-07-15T12:00Z	0.203	false
2019-07-15T11:45Z	0.207	false
2019-07-15T11:30Z	0.209	false
2019-07-15T11:15Z	0.194	false
2019-07-15T11:00Z	0.204	false
2019-07-15T10:45Z	0.202	false
2019-07-15T10:30Z	0.203	false
2019-07-15T10:15Z	0.2	false
2019-07-15T10:00Z	0.201	false
2019-07-15T09:45Z	0.196	false
2019-07-15T09:30Z	0.189	false
2019-07-15T09:15Z	0.187	false
2019-07-15T09:00Z	0.186	false
2019-07-15T08:45Z	0.174	false
2019-07-15T08:30Z	0.171	false
2019-07-15T08:15Z	0.166	false
2019-07-15T08:00Z	0.162	false
2019-07-15T07:45Z	0.157	false
2019-07-15T07:30Z	0.156	false
2019-07-15T07:15Z	0.152	false
2019-07-15T07:00Z	0.152	false
2019-07-15T06:45Z	0.152	false
2019-07-15T06:30Z	0.153	false
2019-07-15T06:15Z	0.154	false
2019-07-15T06:00Z	0.154	false
2019-07-15T05:45Z	0.155	false
2019-07-15T05:30Z	0.156	false
2019-07-15T05:15Z	0.156	false
2019-07-15T05:00Z	0.156	false
2019-07-15T04:45Z	0.156	false
2019-07-15T04:30Z	0.157	false
2019-07-15T04:15Z	0.157	false
2019-07-15T04:00Z	0.158	false
2019-07-15T03:45Z	0.158	false
2019-07-15T03:30Z	0.158	false
2019-07-15T03:15Z	0.158	false
2019-07-15T03:00Z	0.158	false
2019-07-15T02:45Z	0.158	false
2019-07-15T02:30Z	0.16	false
2019-07-15T02:15Z	0.16	false
2019-07-15T02:00Z	0.159	false
2019-07-15T01:45Z	0.159	false
2019-07-15T01:30Z	0.159	false
2019-07-15T01:15Z	0.159	false
2019-07-15T01:00Z	0.159	false
2019-07-15T00:45Z	0.159	false
2019-07-15T00:30Z	0.158	false
2019-07-15T00:15Z	0.159	false
2019-07-15T00:00Z	0.158	false
2019-07-14T23:45Z	0.157	false
2019-07-14T23:30Z	0.157	false
2019-07-14T23:15Z	0.157	false
2019-07-14T23:00Z	0.155	false
2019-07-14T22:45Z	0.155	false
2019-07-14T22:30Z	0.156	false
2019-07-14T22:15Z	0.156	false
2019-07-14T22:00Z	0.155	false
2019-07-14T21:45Z	0.158	false
2019-07-14T21:30Z	0.151	false
2019-07-14T21:15Z	0.156	false
2019-07-14T21:00Z	0.152	false
2019-07-14T20:45Z	0.15	false
2019-07-14T20:30Z	0.144	false
2019-07-14T20:15Z	0.152	false
2019-07-14T20:00Z	0.15	false
2019-07-14T19:45Z	0.149	false
2019-07-14T19:30Z	0.147	false
2019-07-14T19:15Z	0.145	false
2019-07-14T19:00Z	0.146	false
2019-07-14T18:45Z	0.145	false
2019-07-14T18:30Z	0.145	false
2019-07-14T18:15Z	0.143	false
2019-07-14T18:00Z	0.138	false
2019-07-14T17:45Z	0.145	false
2019-07-14T17:30Z	0.145	false
2019-07-14T17:15Z	0.146	false
2019-07-14T17:00Z	0.146	false
2019-07-14T16:45Z	0.147	false
2019-07-14T16:30Z	0.142	false
2019-07-14T16:15Z	0.146	false
2019-07-14T16:00Z	0.153	false
2019-07-14T16:00Z	0.153	false
2019-07-14T15:45Z	0.154	false
2019-07-14T15:45Z	0.154	false
2019-07-14T15:30Z	0.155	false
2019-07-14T15:30Z	0.155	false
2019-07-14T15:15Z	0.153	false
2019-07-14T15:15Z	0.153	false
2019-07-14T15:00Z	0.158	false
2019-07-14T14:45Z	0.161	false
2019-07-14T14:30Z	0.165	false
2019-07-14T14:15Z	0.169	false
2019-07-14T14:00Z	0.174	false
2019-07-14T13:45Z	0.176	false
2019-07-14T13:30Z	0.156	false
2019-07-14T13:15Z	0.181	false
2019-07-14T13:00Z	0.186	false
2019-07-14T12:45Z	0.183	false
2019-07-14T12:30Z	0.185	false
2019-07-14T12:15Z	0.169	false
2019-07-14T12:00Z	0.186	false
2019-07-14T11:45Z	0.181	false
2019-07-14T11:30Z	0.182	false
2019-07-14T11:15Z	0.18	false
2019-07-14T11:00Z	0.181	false
2019-07-14T10:45Z	0.181	false
2019-07-14T10:30Z	0.175	false
2019-07-14T10:15Z	0.179	false
2019-07-14T10:00Z	0.183	false
2019-07-14T09:45Z	0.183	false
2019-07-14T09:30Z	0.18	false
2019-07-14T09:15Z	0.18	false
2019-07-14T09:00Z	0.183	false
2019-07-14T08:45Z	0.185	false
2019-07-14T08:30Z	0.184	false
2019-07-14T08:15Z	0.186	false
2019-07-14T08:00Z	0.183	false
2019-07-14T07:45Z	0.183	false
2019-07-14T07:30Z	0.183	false
2019-07-14T07:15Z	0.185	false
2019-07-14T07:00Z	0.185	false
2019-07-14T06:45Z	0.188	false
2019-07-14T06:30Z	0.185	false
2019-07-14T06:15Z	0.187	false
2019-07-14T06:00Z	0.186	false
2019-07-14T05:45Z	0.187	false
2019-07-14T05:30Z	0.188	false
2019-07-14T05:15Z	0.186	false
2019-07-14T05:00Z	0.188	false
2019-07-14T04:45Z	0.19	false
2019-07-14T04:30Z	0.189	false
2019-07-14T04:15Z	0.189	false
2019-07-14T04:00Z	0.189	false
2019-07-14T03:45Z	0.19	false
2019-07-14T03:30Z	0.189	false
2019-07-14T03:15Z	0.19	false
2019-07-14T03:00Z	0.19	false
2019-07-14T02:45Z	0.191	false
2019-07-14T02:30Z	0.193	false
2019-07-14T02:15Z	0.191	false
2019-07-14T02:00Z	0.192	false
2019-07-14T01:45Z	0.193	false
2019-07-14T01:30Z	0.194	false
2019-07-14T01:15Z	0.193	false
2019-07-14T01:00Z	0.194	false
2019-07-14T00:45Z	0.195	false
2019-07-14T00:30Z	0.193	false
2019-07-14T00:15Z	0.194	false
2019-07-14T00:00Z	0.193	false
2019-07-13T23:45Z	0.195	false
2019-07-13T23:30Z	0.193	false
2019-07-13T23:15Z	0.193	false
2019-07-13T23:00Z	0.192	false
2019-07-13T22:45Z	0.198	false
2019-07-13T22:30Z	0.192	false
2019-07-13T22:15Z	0.194	false
2019-07-13T22:00Z	0.195	false
2019-07-13T21:45Z	0.192	false
2019-07-13T21:30Z	0.194	false
2019-07-13T21:15Z	0.194	false
2019-07-13T21:00Z	0.198	false
2019-07-13T20:45Z	0.194	false
2019-07-13T20:30Z	0.196	false
2019-07-13T20:15Z	0.196	false
2019-07-13T20:00Z	0.199	false
2019-07-13T19:45Z	0.197	false
2019-07-13T19:30Z	0.2	false
2019-07-13T19:15Z	0.196	false
2019-07-13T19:00Z	0.199	false
2019-07-13T18:45Z	0.192	false
2019-07-13T18:30Z	0.198	false
2019-07-13T18:15Z	0.199	false
2019-07-13T18:00Z	0.2	false
2019-07-13T17:45Z	0.2	false
2019-07-13T17:30Z	0.185	false
2019-07-13T17:15Z	0.203	false
2019-07-13T17:00Z	0.2	false
2019-07-13T16:45Z	0.171	false
2019-07-13T16:30Z	0.198	false
2019-07-13T16:15Z	0.198	false
2019-07-13T16:00Z	0.195	false
2019-07-13T15:45Z	0.194	false
2019-07-13T15:30Z	0.195	false
2019-07-13T15:15Z	0.201	false
2019-07-13T15:00Z	0.2	false
2019-07-13T14:45Z	0.198	false
2019-07-13T14:30Z	0.2	false
2019-07-13T14:15Z	0.196	false
2019-07-13T14:00Z	0.197	false
2019-07-13T13:45Z	0.195	false
2019-07-13T13:30Z	0.194	false
2019-07-13T13:15Z	0.178	false
2019-07-13T13:00Z	0.198	false
2019-07-13T12:45Z	0.195	false
2019-07-13T12:30Z	0.196	false
2019-07-13T12:15Z	0.194	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

Share this page

• Twitter
• Facebook
• Email