River level River Thames at Grafton Lock (upstream data)

Check for flood warnings in this area

Latest recorded level 0.14m at 10:15pm Monday 19 October 2020.

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 0.38m 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
2020-10-19T21:15Z	0.141	false
2020-10-19T21:00Z	0.142	false
2020-10-19T20:45Z	0.142	false
2020-10-19T20:30Z	0.141	false
2020-10-19T20:15Z	0.142	false
2020-10-19T20:00Z	0.142	false
2020-10-19T19:45Z	0.142	false
2020-10-19T19:30Z	0.143	false
2020-10-19T19:15Z	0.144	false
2020-10-19T19:00Z	0.143	false
2020-10-19T18:45Z	0.144	false
2020-10-19T18:30Z	0.144	false
2020-10-19T18:15Z	0.144	false
2020-10-19T18:00Z	0.144	false
2020-10-19T17:45Z	0.144	false
2020-10-19T17:30Z	0.145	false
2020-10-19T17:15Z	0.145	false
2020-10-19T17:00Z	0.144	false
2020-10-19T16:45Z	0.145	false
2020-10-19T16:30Z	0.145	false
2020-10-19T16:15Z	0.145	false
2020-10-19T16:00Z	0.144	false
2020-10-19T15:45Z	0.145	false
2020-10-19T15:30Z	0.145	false
2020-10-19T15:15Z	0.148	false
2020-10-19T15:00Z	0.146	false
2020-10-19T14:45Z	0.145	false
2020-10-19T14:30Z	0.145	false
2020-10-19T14:15Z	0.146	false
2020-10-19T14:00Z	0.146	false
2020-10-19T13:45Z	0.148	false
2020-10-19T13:30Z	0.145	false
2020-10-19T13:15Z	0.145	false
2020-10-19T13:00Z	0.141	false
2020-10-19T12:45Z	0.147	false
2020-10-19T12:30Z	0.149	false
2020-10-19T12:15Z	0.147	false
2020-10-19T12:00Z	0.15	false
2020-10-19T11:45Z	0.149	false
2020-10-19T11:30Z	0.147	false
2020-10-19T11:15Z	0.153	false
2020-10-19T11:00Z	0.151	false
2020-10-19T10:45Z	0.151	false
2020-10-19T10:30Z	0.15	false
2020-10-19T10:15Z	0.148	false
2020-10-19T10:00Z	0.126	false
2020-10-19T09:45Z	0.15	false
2020-10-19T09:30Z	0.15	false
2020-10-19T09:15Z	0.151	false
2020-10-19T09:00Z	0.151	false
2020-10-19T08:45Z	0.151	false
2020-10-19T08:30Z	0.15	false
2020-10-19T08:15Z	0.149	false
2020-10-19T08:00Z	0.15	false
2020-10-19T07:45Z	0.15	false
2020-10-19T07:30Z	0.15	false
2020-10-19T07:15Z	0.15	false
2020-10-19T07:00Z	0.151	false
2020-10-19T06:45Z	0.15	false
2020-10-19T06:30Z	0.151	false
2020-10-19T06:15Z	0.15	false
2020-10-19T06:00Z	0.151	false
2020-10-19T05:45Z	0.151	false
2020-10-19T05:30Z	0.152	false
2020-10-19T05:15Z	0.151	false
2020-10-19T05:00Z	0.152	false
2020-10-19T04:45Z	0.151	false
2020-10-19T04:30Z	0.153	false
2020-10-19T04:15Z	0.153	false
2020-10-19T04:00Z	0.152	false
2020-10-19T03:45Z	0.152	false
2020-10-19T03:30Z	0.154	false
2020-10-19T03:15Z	0.152	false
2020-10-19T03:00Z	0.153	false
2020-10-19T02:45Z	0.154	false
2020-10-19T02:30Z	0.153	false
2020-10-19T02:15Z	0.154	false
2020-10-19T02:00Z	0.154	false
2020-10-19T01:45Z	0.154	false
2020-10-19T01:30Z	0.154	false
2020-10-19T01:15Z	0.155	false
2020-10-19T01:00Z	0.154	false
2020-10-19T00:45Z	0.155	false
2020-10-19T00:30Z	0.155	false
2020-10-19T00:15Z	0.155	false
2020-10-19T00:00Z	0.155	false
2020-10-18T23:45Z	0.156	false
2020-10-18T23:30Z	0.156	false
2020-10-18T23:15Z	0.156	false
2020-10-18T23:00Z	0.157	false
2020-10-18T22:45Z	0.156	false
2020-10-18T22:30Z	0.157	false
2020-10-18T22:15Z	0.157	false
2020-10-18T22:00Z	0.157	false
2020-10-18T21:45Z	0.157	false
2020-10-18T21:30Z	0.157	false
2020-10-18T21:15Z	0.157	false
2020-10-18T21:00Z	0.157	false
2020-10-18T20:45Z	0.158	false
2020-10-18T20:30Z	0.157	false
2020-10-18T20:15Z	0.158	false
2020-10-18T20:00Z	0.158	false
2020-10-18T19:45Z	0.158	false
2020-10-18T19:30Z	0.158	false
2020-10-18T19:15Z	0.159	false
2020-10-18T19:00Z	0.158	false
2020-10-18T18:45Z	0.158	false
2020-10-18T18:30Z	0.159	false
2020-10-18T18:15Z	0.158	false
2020-10-18T18:00Z	0.159	false
2020-10-18T17:45Z	0.159	false
2020-10-18T17:30Z	0.159	false
2020-10-18T17:15Z	0.159	false
2020-10-18T17:00Z	0.159	false
2020-10-18T16:45Z	0.159	false
2020-10-18T16:30Z	0.159	false
2020-10-18T16:15Z	0.159	false
2020-10-18T16:00Z	0.161	false
2020-10-18T15:45Z	0.16	false
2020-10-18T15:30Z	0.159	false
2020-10-18T15:15Z	0.158	false
2020-10-18T15:00Z	0.157	false
2020-10-18T14:45Z	0.158	false
2020-10-18T14:30Z	0.156	false
2020-10-18T14:15Z	0.156	false
2020-10-18T14:00Z	0.158	false
2020-10-18T13:45Z	0.144	false
2020-10-18T13:30Z	0.167	false
2020-10-18T13:15Z	0.159	false
2020-10-18T13:00Z	0.158	false
2020-10-18T12:45Z	0.158	false
2020-10-18T12:30Z	0.161	false
2020-10-18T12:15Z	0.15	false
2020-10-18T12:00Z	0.159	false
2020-10-18T11:45Z	0.158	false
2020-10-18T11:30Z	0.158	false
2020-10-18T11:15Z	0.159	false
2020-10-18T11:00Z	0.159	false
2020-10-18T10:45Z	0.156	false
2020-10-18T10:30Z	0.161	false
2020-10-18T10:15Z	0.16	false
2020-10-18T10:00Z	0.16	false
2020-10-18T09:45Z	0.159	false
2020-10-18T09:30Z	0.159	false
2020-10-18T09:15Z	0.158	false
2020-10-18T09:00Z	0.16	false
2020-10-18T08:45Z	0.159	false
2020-10-18T08:30Z	0.16	false
2020-10-18T08:15Z	0.162	false
2020-10-18T08:00Z	0.16	false
2020-10-18T07:45Z	0.16	false
2020-10-18T07:30Z	0.158	false
2020-10-18T07:15Z	0.158	false
2020-10-18T07:00Z	0.158	false
2020-10-18T06:45Z	0.158	false
2020-10-18T06:30Z	0.157	false
2020-10-18T06:15Z	0.157	false
2020-10-18T06:00Z	0.158	false
2020-10-18T05:45Z	0.157	false
2020-10-18T05:30Z	0.158	false
2020-10-18T05:15Z	0.158	false
2020-10-18T05:00Z	0.158	false
2020-10-18T04:45Z	0.157	false
2020-10-18T04:30Z	0.158	false
2020-10-18T04:15Z	0.158	false
2020-10-18T04:00Z	0.158	false
2020-10-18T03:45Z	0.157	false
2020-10-18T03:30Z	0.157	false
2020-10-18T03:15Z	0.157	false
2020-10-18T03:00Z	0.158	false
2020-10-18T02:45Z	0.158	false
2020-10-18T02:30Z	0.158	false
2020-10-18T02:15Z	0.158	false
2020-10-18T02:00Z	0.159	false
2020-10-18T01:45Z	0.159	false
2020-10-18T01:30Z	0.159	false
2020-10-18T01:15Z	0.16	false
2020-10-18T01:00Z	0.16	false
2020-10-18T00:45Z	0.159	false
2020-10-18T00:30Z	0.16	false
2020-10-18T00:15Z	0.16	false
2020-10-18T00:00Z	0.161	false
2020-10-17T23:45Z	0.16	false
2020-10-17T23:30Z	0.161	false
2020-10-17T23:15Z	0.161	false
2020-10-17T23:00Z	0.162	false
2020-10-17T22:45Z	0.162	false
2020-10-17T22:30Z	0.162	false
2020-10-17T22:15Z	0.162	false
2020-10-17T22:00Z	0.163	false
2020-10-17T21:45Z	0.162	false
2020-10-17T21:30Z	0.164	false
2020-10-17T21:15Z	0.163	false
2020-10-17T21:00Z	0.163	false
2020-10-17T20:45Z	0.165	false
2020-10-17T20:30Z	0.165	false
2020-10-17T20:15Z	0.165	false
2020-10-17T20:00Z	0.165	false
2020-10-17T19:45Z	0.166	false
2020-10-17T19:30Z	0.165	false
2020-10-17T19:15Z	0.166	false
2020-10-17T19:00Z	0.165	false
2020-10-17T18:45Z	0.166	false
2020-10-17T18:30Z	0.166	false
2020-10-17T18:15Z	0.165	false
2020-10-17T18:00Z	0.166	false
2020-10-17T17:45Z	0.166	false
2020-10-17T17:30Z	0.166	false
2020-10-17T17:15Z	0.165	false
2020-10-17T17:00Z	0.166	false
2020-10-17T16:45Z	0.165	false
2020-10-17T16:30Z	0.166	false
2020-10-17T16:15Z	0.165	false
2020-10-17T16:00Z	0.164	false
2020-10-17T15:45Z	0.165	false
2020-10-17T15:30Z	0.164	false
2020-10-17T15:15Z	0.164	false
2020-10-17T15:00Z	0.164	false
2020-10-17T14:45Z	0.161	false
2020-10-17T14:30Z	0.164	false
2020-10-17T14:15Z	0.167	false
2020-10-17T14:00Z	0.168	false
2020-10-17T13:45Z	0.169	false
2020-10-17T13:30Z	0.171	false
2020-10-17T13:15Z	0.173	false
2020-10-17T13:00Z	0.174	false
2020-10-17T12:45Z	0.166	false
2020-10-17T12:30Z	0.168	false
2020-10-17T12:15Z	0.117	false
2020-10-17T12:00Z	0.167	false
2020-10-17T11:45Z	0.165	false
2020-10-17T11:30Z	0.168	false
2020-10-17T11:15Z	0.166	false
2020-10-17T11:00Z	0.165	false
2020-10-17T10:45Z	0.166	false
2020-10-17T10:30Z	0.163	false
2020-10-17T10:15Z	0.166	false
2020-10-17T10:00Z	0.166	false
2020-10-17T09:45Z	0.164	false
2020-10-17T09:30Z	0.164	false
2020-10-17T09:15Z	0.163	false
2020-10-17T09:00Z	0.166	false
2020-10-17T08:45Z	0.164	false
2020-10-17T08:30Z	0.166	false
2020-10-17T08:15Z	0.164	false
2020-10-17T08:00Z	0.164	false
2020-10-17T07:45Z	0.164	false
2020-10-17T07:30Z	0.167	false
2020-10-17T07:15Z	0.167	false
2020-10-17T07:00Z	0.166	false
2020-10-17T06:45Z	0.166	false
2020-10-17T06:30Z	0.166	false
2020-10-17T06:15Z	0.165	false
2020-10-17T06:00Z	0.166	false
2020-10-17T05:45Z	0.165	false
2020-10-17T05:30Z	0.166	false
2020-10-17T05:15Z	0.166	false
2020-10-17T05:00Z	0.166	false
2020-10-17T04:45Z	0.165	false
2020-10-17T04:30Z	0.165	false
2020-10-17T04:15Z	0.166	false
2020-10-17T04:00Z	0.166	false
2020-10-17T03:45Z	0.166	false
2020-10-17T03:30Z	0.166	false
2020-10-17T03:15Z	0.165	false
2020-10-17T03:00Z	0.166	false
2020-10-17T02:45Z	0.166	false
2020-10-17T02:30Z	0.166	false
2020-10-17T02:15Z	0.165	false
2020-10-17T02:00Z	0.166	false
2020-10-17T01:45Z	0.166	false
2020-10-17T01:30Z	0.166	false
2020-10-17T01:15Z	0.165	false
2020-10-17T01:00Z	0.166	false
2020-10-17T00:45Z	0.166	false
2020-10-17T00:30Z	0.166	false
2020-10-17T00:15Z	0.166	false
2020-10-17T00:00Z	0.166	false
2020-10-16T23:45Z	0.166	false
2020-10-16T23:30Z	0.166	false
2020-10-16T23:15Z	0.165	false
2020-10-16T23:00Z	0.165	false
2020-10-16T22:45Z	0.165	false
2020-10-16T22:30Z	0.165	false
2020-10-16T22:15Z	0.165	false
2020-10-16T22:00Z	0.165	false
2020-10-16T21:45Z	0.165	false
2020-10-16T21:30Z	0.165	false
2020-10-16T21:15Z	0.165	false
2020-10-16T21:00Z	0.165	false
2020-10-16T20:45Z	0.165	false
2020-10-16T20:30Z	0.165	false
2020-10-16T20:15Z	0.164	false
2020-10-16T20:00Z	0.165	false
2020-10-16T19:45Z	0.165	false
2020-10-16T19:30Z	0.164	false
2020-10-16T19:15Z	0.165	false
2020-10-16T19:00Z	0.164	false
2020-10-16T18:45Z	0.164	false
2020-10-16T18:30Z	0.165	false
2020-10-16T18:15Z	0.164	false
2020-10-16T18:00Z	0.163	false
2020-10-16T17:45Z	0.166	false
2020-10-16T17:30Z	0.166	false
2020-10-16T17:15Z	0.166	false
2020-10-16T17:00Z	0.166	false
2020-10-16T16:45Z	0.164	false
2020-10-16T16:30Z	0.167	false
2020-10-16T16:15Z	0.165	false
2020-10-16T16:00Z	0.166	false
2020-10-16T15:45Z	0.166	false
2020-10-16T15:30Z	0.164	false
2020-10-16T15:15Z	0.164	false
2020-10-16T15:00Z	0.165	false
2020-10-16T14:45Z	0.166	false
2020-10-16T14:30Z	0.165	false
2020-10-16T14:15Z	0.166	false
2020-10-16T14:00Z	0.17	false
2020-10-16T13:45Z	0.169	false
2020-10-16T13:30Z	0.168	false
2020-10-16T13:15Z	0.167	false
2020-10-16T13:00Z	0.167	false
2020-10-16T12:45Z	0.167	false
2020-10-16T12:30Z	0.167	false
2020-10-16T12:15Z	0.164	false
2020-10-16T12:00Z	0.167	false
2020-10-16T11:45Z	0.166	false
2020-10-16T11:30Z	0.167	false
2020-10-16T11:15Z	0.167	false
2020-10-16T11:00Z	0.167	false
2020-10-16T10:45Z	0.167	false
2020-10-16T10:30Z	0.167	false
2020-10-16T10:15Z	0.169	false
2020-10-16T10:00Z	0.167	false
2020-10-16T09:45Z	0.168	false
2020-10-16T09:30Z	0.168	false
2020-10-16T09:15Z	0.171	false
2020-10-16T09:00Z	0.168	false
2020-10-16T08:45Z	0.168	false
2020-10-16T08:30Z	0.168	false
2020-10-16T08:15Z	0.168	false
2020-10-16T08:00Z	0.168	false
2020-10-16T07:45Z	0.168	false
2020-10-16T07:30Z	0.168	false
2020-10-16T07:15Z	0.168	false
2020-10-16T07:00Z	0.169	false
2020-10-16T06:45Z	0.168	false
2020-10-16T06:30Z	0.168	false
2020-10-16T06:15Z	0.168	false
2020-10-16T06:00Z	0.168	false
2020-10-16T05:45Z	0.169	false
2020-10-16T05:30Z	0.168	false
2020-10-16T05:15Z	0.169	false
2020-10-16T05:00Z	0.169	false
2020-10-16T04:45Z	0.169	false
2020-10-16T04:30Z	0.169	false
2020-10-16T04:15Z	0.169	false
2020-10-16T04:00Z	0.168	false
2020-10-16T03:45Z	0.169	false
2020-10-16T03:30Z	0.169	false
2020-10-16T03:15Z	0.17	false
2020-10-16T03:00Z	0.17	false
2020-10-16T02:45Z	0.17	false
2020-10-16T02:30Z	0.17	false
2020-10-16T02:15Z	0.17	false
2020-10-16T02:00Z	0.17	false
2020-10-16T01:45Z	0.171	false
2020-10-16T01:30Z	0.171	false
2020-10-16T01:15Z	0.171	false
2020-10-16T01:00Z	0.171	false
2020-10-16T00:45Z	0.171	false
2020-10-16T00:30Z	0.171	false
2020-10-16T00:15Z	0.172	false
2020-10-16T00:00Z	0.172	false
2020-10-15T23:45Z	0.172	false
2020-10-15T23:30Z	0.172	false
2020-10-15T23:15Z	0.172	false
2020-10-15T23:00Z	0.172	false
2020-10-15T22:45Z	0.172	false
2020-10-15T22:30Z	0.172	false
2020-10-15T22:15Z	0.172	false
2020-10-15T22:00Z	0.172	false
2020-10-15T21:45Z	0.172	false
2020-10-15T21:30Z	0.172	false
2020-10-15T21:15Z	0.171	false
2020-10-15T21:00Z	0.172	false
2020-10-15T20:45Z	0.171	false
2020-10-15T20:30Z	0.17	false
2020-10-15T20:15Z	0.17	false
2020-10-15T20:00Z	0.169	false
2020-10-15T19:45Z	0.169	false
2020-10-15T19:30Z	0.168	false
2020-10-15T19:15Z	0.168	false
2020-10-15T19:00Z	0.167	false
2020-10-15T18:45Z	0.165	false
2020-10-15T18:30Z	0.164	false
2020-10-15T18:15Z	0.162	false
2020-10-15T18:00Z	0.161	false
2020-10-15T17:45Z	0.16	false
2020-10-15T17:30Z	0.159	false
2020-10-15T17:15Z	0.158	false
2020-10-15T17:00Z	0.155	false
2020-10-15T16:45Z	0.153	false
2020-10-15T16:30Z	0.15	false
2020-10-15T16:15Z	0.148	false
2020-10-15T16:00Z	0.147	false
2020-10-15T15:45Z	0.144	false
2020-10-15T15:30Z	0.14	false
2020-10-15T15:15Z	0.137	false
2020-10-15T15:00Z	0.133	false
2020-10-15T14:45Z	0.13	false
2020-10-15T14:30Z	0.126	false
2020-10-15T14:15Z	0.123	false
2020-10-15T14:00Z	0.117	false
2020-10-15T13:45Z	0.114	false
2020-10-15T13:30Z	0.11	false
2020-10-15T13:15Z	0.104	false
2020-10-15T13:00Z	0.099	false
2020-10-15T12:45Z	0.094	false
2020-10-15T12:30Z	0.088	false
2020-10-15T12:15Z	0.083	false
2020-10-15T12:00Z	0.078	false
2020-10-15T11:45Z	0.074	false
2020-10-15T11:30Z	0.069	false
2020-10-15T11:15Z	0.063	false
2020-10-15T11:00Z	0.058	false
2020-10-15T10:45Z	0.055	false
2020-10-15T10:30Z	0.048	false
2020-10-15T10:15Z	0.044	false
2020-10-15T10:00Z	0.033	false
2020-10-15T09:45Z	0.04	false
2020-10-15T09:30Z	0.044	false
2020-10-15T09:15Z	0.051	false
2020-10-15T09:00Z	0.061	false
2020-10-15T08:45Z	0.059	false
2020-10-15T08:30Z	0.059	false
2020-10-15T08:15Z	0.06	false
2020-10-15T08:00Z	0.059	false
2020-10-15T07:45Z	0.059	false
2020-10-15T07:30Z	0.059	false
2020-10-15T07:15Z	0.06	false
2020-10-15T07:00Z	0.06	false
2020-10-15T06:45Z	0.061	false
2020-10-15T06:30Z	0.06	false
2020-10-15T06:15Z	0.059	false
2020-10-15T06:00Z	0.06	false
2020-10-15T05:45Z	0.061	false
2020-10-15T05:30Z	0.061	false
2020-10-15T05:15Z	0.06	false
2020-10-15T05:00Z	0.061	false
2020-10-15T04:45Z	0.062	false
2020-10-15T04:30Z	0.062	false
2020-10-15T04:15Z	0.062	false
2020-10-15T04:00Z	0.061	false
2020-10-15T03:45Z	0.062	false
2020-10-15T03:30Z	0.062	false
2020-10-15T03:15Z	0.063	false
2020-10-15T03:00Z	0.064	false
2020-10-15T02:45Z	0.063	false
2020-10-15T02:30Z	0.064	false
2020-10-15T02:15Z	0.066	false
2020-10-15T02:00Z	0.065	false
2020-10-15T01:45Z	0.066	false
2020-10-15T01:30Z	0.065	false
2020-10-15T01:15Z	0.067	false
2020-10-15T01:00Z	0.068	false
2020-10-15T00:45Z	0.068	false
2020-10-15T00:30Z	0.068	false
2020-10-15T00:15Z	0.069	false
2020-10-15T00:00Z	0.069	false
2020-10-14T23:45Z	0.07	false
2020-10-14T23:30Z	0.071	false
2020-10-14T23:15Z	0.072	false
2020-10-14T23:00Z	0.072	false
2020-10-14T22:45Z	0.072	false
2020-10-14T22:30Z	0.072	false
2020-10-14T22:15Z	0.074	false
2020-10-14T22:00Z	0.074	false
2020-10-14T21:45Z	0.075	false
2020-10-14T21:30Z	0.076	false
2020-10-14T21:15Z	0.076	false

Forecast data

Key information

• Station name: Grafton Lock (upstream)
• Station ID: 7035
• River name: River Thames
• Typical range: 0.00m to 0.38m
• Highest level on record: 1.11m on 22 July 2007
• Site datum: 68.57mAOD (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
• Check the long term flood risk for an area in England.

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