River level River Thames at Grafton Lock (upstream data)

Check for flood warnings in this area

Latest recorded level 0.15m at 9:00pm Friday 19 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
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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
2019-07-19T20:00Z	0.146	false
2019-07-19T19:45Z	0.146	false
2019-07-19T19:30Z	0.145	false
2019-07-19T19:15Z	0.145	false
2019-07-19T19:00Z	0.144	false
2019-07-19T18:45Z	0.144	false
2019-07-19T18:30Z	0.145	false
2019-07-19T18:15Z	0.143	false
2019-07-19T18:00Z	0.142	false
2019-07-19T17:45Z	0.14	false
2019-07-19T17:30Z	0.138	false
2019-07-19T17:15Z	0.142	false
2019-07-19T17:00Z	0.139	false
2019-07-19T16:45Z	0.139	false
2019-07-19T16:30Z	0.138	false
2019-07-19T16:15Z	0.136	false
2019-07-19T16:00Z	0.132	false
2019-07-19T15:45Z	0.132	false
2019-07-19T15:30Z	0.134	false
2019-07-19T15:15Z	0.131	false
2019-07-19T15:00Z	0.135	false
2019-07-19T14:45Z	0.133	false
2019-07-19T14:30Z	0.134	false
2019-07-19T14:15Z	0.133	false
2019-07-19T14:00Z	0.133	false
2019-07-19T13:45Z	0.133	false
2019-07-19T13:30Z	0.132	false
2019-07-19T13:15Z	0.136	false
2019-07-19T13:00Z	0.135	false
2019-07-19T12:45Z	0.133	false
2019-07-19T12:30Z	0.136	false
2019-07-19T12:15Z	0.134	false
2019-07-19T12:00Z	0.137	false
2019-07-19T11:45Z	0.123	false
2019-07-19T11:30Z	0.133	false
2019-07-19T11:15Z	0.138	false
2019-07-19T11:00Z	0.138	false
2019-07-19T10:45Z	0.135	false
2019-07-19T10:30Z	0.133	false
2019-07-19T10:15Z	0.132	false
2019-07-19T10:00Z	0.135	false
2019-07-19T09:45Z	0.133	false
2019-07-19T09:30Z	0.133	false
2019-07-19T09:15Z	0.132	false
2019-07-19T09:00Z	0.128	false
2019-07-19T08:45Z	0.128	false
2019-07-19T08:30Z	0.129	false
2019-07-19T08:15Z	0.129	false
2019-07-19T08:00Z	0.128	false
2019-07-19T07:45Z	0.127	false
2019-07-19T07:30Z	0.128	false
2019-07-19T07:15Z	0.127	false
2019-07-19T07:00Z	0.127	false
2019-07-19T06:45Z	0.126	false
2019-07-19T06:30Z	0.126	false
2019-07-19T06:15Z	0.126	false
2019-07-19T06:00Z	0.126	false
2019-07-19T05:45Z	0.125	false
2019-07-19T05:30Z	0.125	false
2019-07-19T05:15Z	0.124	false
2019-07-19T05:00Z	0.124	false
2019-07-19T04:45Z	0.124	false
2019-07-19T04:30Z	0.124	false
2019-07-19T04:15Z	0.125	false
2019-07-19T04:00Z	0.123	false
2019-07-19T03:45Z	0.123	false
2019-07-19T03:30Z	0.123	false
2019-07-19T03:15Z	0.123	false
2019-07-19T03:00Z	0.123	false
2019-07-19T02:45Z	0.122	false
2019-07-19T02:30Z	0.122	false
2019-07-19T02:15Z	0.122	false
2019-07-19T02:00Z	0.122	false
2019-07-19T01:45Z	0.121	false
2019-07-19T01:30Z	0.122	false
2019-07-19T01:15Z	0.121	false
2019-07-19T01:00Z	0.121	false
2019-07-19T00:45Z	0.121	false
2019-07-19T00:30Z	0.12	false
2019-07-19T00:15Z	0.12	false
2019-07-19T00:00Z	0.12	false
2019-07-18T23:45Z	0.12	false
2019-07-18T23:30Z	0.119	false
2019-07-18T23:15Z	0.119	false
2019-07-18T23:00Z	0.119	false
2019-07-18T22:45Z	0.119	false
2019-07-18T22:30Z	0.118	false
2019-07-18T22:15Z	0.118	false
2019-07-18T22:00Z	0.118	false
2019-07-18T21:45Z	0.117	false
2019-07-18T21:30Z	0.116	false
2019-07-18T21:15Z	0.116	false
2019-07-18T21:00Z	0.115	false
2019-07-18T20:45Z	0.116	false
2019-07-18T20:30Z	0.115	false
2019-07-18T20:15Z	0.115	false
2019-07-18T20:00Z	0.114	false
2019-07-18T19:45Z	0.113	false
2019-07-18T19:30Z	0.114	false
2019-07-18T19:15Z	0.114	false
2019-07-18T19:00Z	0.113	false
2019-07-18T18:45Z	0.115	false
2019-07-18T18:30Z	0.115	false
2019-07-18T18:15Z	0.112	false
2019-07-18T18:00Z	0.113	false
2019-07-18T17:45Z	0.113	false
2019-07-18T17:30Z	0.114	false
2019-07-18T17:15Z	0.112	false
2019-07-18T17:00Z	0.114	false
2019-07-18T16:45Z	0.113	false
2019-07-18T16:30Z	0.11	false
2019-07-18T16:15Z	0.109	false
2019-07-18T16:00Z	0.107	false
2019-07-18T15:45Z	0.109	false
2019-07-18T15:30Z	0.105	false
2019-07-18T15:15Z	0.105	false
2019-07-18T15:00Z	0.109	false
2019-07-18T14:45Z	0.11	false
2019-07-18T14:30Z	0.11	false
2019-07-18T14:15Z	0.104	false
2019-07-18T14:00Z	0.108	false
2019-07-18T13:45Z	0.109	false
2019-07-18T13:30Z	0.11	false
2019-07-18T13:15Z	0.11	false
2019-07-18T13:00Z	0.115	false
2019-07-18T12:45Z	0.111	false
2019-07-18T12:30Z	0.125	false
2019-07-18T12:15Z	0.113	false
2019-07-18T12:00Z	0.106	false
2019-07-18T11:45Z	0.117	false
2019-07-18T11:30Z	0.116	false
2019-07-18T11:15Z	0.117	false
2019-07-18T11:00Z	0.113	false
2019-07-18T10:45Z	0.125	false
2019-07-18T10:30Z	0.127	false
2019-07-18T10:15Z	0.128	false
2019-07-18T10:00Z	0.135	false
2019-07-18T09:45Z	0.134	false
2019-07-18T09:30Z	0.138	false
2019-07-18T09:15Z	0.137	false
2019-07-18T09:00Z	0.142	false
2019-07-18T08:45Z	0.14	false
2019-07-18T08:30Z	0.143	false
2019-07-18T08:15Z	0.145	false
2019-07-18T08:00Z	0.143	false
2019-07-18T07:45Z	0.146	false
2019-07-18T07:30Z	0.145	false
2019-07-18T07:15Z	0.145	false
2019-07-18T07:00Z	0.145	false
2019-07-18T06:45Z	0.143	false
2019-07-18T06:30Z	0.144	false
2019-07-18T06:15Z	0.145	false
2019-07-18T06:00Z	0.145	false
2019-07-18T05:45Z	0.144	false
2019-07-18T05:30Z	0.144	false
2019-07-18T05:15Z	0.144	false
2019-07-18T05:00Z	0.144	false
2019-07-18T04:45Z	0.144	false
2019-07-18T04:30Z	0.143	false
2019-07-18T04:15Z	0.144	false
2019-07-18T04:00Z	0.143	false
2019-07-18T03:45Z	0.143	false
2019-07-18T03:30Z	0.144	false
2019-07-18T03:15Z	0.142	false
2019-07-18T03:00Z	0.143	false
2019-07-18T02:45Z	0.144	false
2019-07-18T02:30Z	0.144	false
2019-07-18T02:15Z	0.141	false
2019-07-18T02:00Z	0.143	false
2019-07-18T01:45Z	0.142	false
2019-07-18T01:30Z	0.142	false
2019-07-18T01:15Z	0.142	false
2019-07-18T01:00Z	0.142	false
2019-07-18T00:45Z	0.142	false
2019-07-18T00:30Z	0.141	false
2019-07-18T00:15Z	0.142	false
2019-07-18T00:00Z	0.141	false
2019-07-17T23:45Z	0.141	false
2019-07-17T23:30Z	0.141	false
2019-07-17T23:15Z	0.142	false
2019-07-17T23:00Z	0.141	false
2019-07-17T22:45Z	0.142	false
2019-07-17T22:30Z	0.142	false
2019-07-17T22:15Z	0.141	false
2019-07-17T22:00Z	0.141	false
2019-07-17T21:45Z	0.141	false
2019-07-17T21:30Z	0.14	false
2019-07-17T21:15Z	0.141	false
2019-07-17T21:00Z	0.141	false
2019-07-17T20:45Z	0.14	false
2019-07-17T20:30Z	0.14	false
2019-07-17T20:15Z	0.14	false
2019-07-17T20:00Z	0.14	false
2019-07-17T19:45Z	0.141	false
2019-07-17T19:30Z	0.142	false
2019-07-17T19:15Z	0.141	false
2019-07-17T19:00Z	0.14	false
2019-07-17T18:45Z	0.142	false
2019-07-17T18:30Z	0.14	false
2019-07-17T18:15Z	0.142	false
2019-07-17T18:00Z	0.141	false
2019-07-17T17:45Z	0.141	false
2019-07-17T17:30Z	0.138	false
2019-07-17T17:15Z	0.141	false
2019-07-17T17:00Z	0.142	false
2019-07-17T16:45Z	0.142	false
2019-07-17T16:30Z	0.14	false
2019-07-17T16:15Z	0.141	false
2019-07-17T16:00Z	0.141	false
2019-07-17T15:45Z	0.141	false
2019-07-17T15:30Z	0.142	false
2019-07-17T15:15Z	0.144	false
2019-07-17T15:00Z	0.142	false
2019-07-17T14:45Z	0.142	false
2019-07-17T14:30Z	0.144	false
2019-07-17T14:15Z	0.144	false
2019-07-17T14:00Z	0.147	false
2019-07-17T13:45Z	0.149	false
2019-07-17T13:30Z	0.147	false
2019-07-17T13:15Z	0.146	false
2019-07-17T13:00Z	0.145	false
2019-07-17T12:45Z	0.142	false
2019-07-17T12:30Z	0.146	false
2019-07-17T12:15Z	0.146	false
2019-07-17T12:00Z	0.144	false
2019-07-17T11:45Z	0.145	false
2019-07-17T11:30Z	0.145	false
2019-07-17T11:15Z	0.144	false
2019-07-17T11:00Z	0.146	false
2019-07-17T10:45Z	0.147	false
2019-07-17T10:30Z	0.146	false
2019-07-17T10:15Z	0.147	false
2019-07-17T10:00Z	0.148	false
2019-07-17T09:45Z	0.15	false
2019-07-17T09:30Z	0.151	false
2019-07-17T09:15Z	0.149	false
2019-07-17T09:00Z	0.149	false
2019-07-17T08:45Z	0.148	false
2019-07-17T08:30Z	0.148	false
2019-07-17T08:15Z	0.148	false
2019-07-17T08:00Z	0.147	false
2019-07-17T07:45Z	0.147	false
2019-07-17T07:30Z	0.145	false
2019-07-17T07:15Z	0.147	false
2019-07-17T07:00Z	0.146	false
2019-07-17T06:45Z	0.147	false
2019-07-17T06:30Z	0.147	false
2019-07-17T06:15Z	0.147	false
2019-07-17T06:00Z	0.147	false
2019-07-17T05:45Z	0.147	false
2019-07-17T05:30Z	0.147	false
2019-07-17T05:15Z	0.146	false
2019-07-17T05:00Z	0.146	false
2019-07-17T04:45Z	0.146	false
2019-07-17T04:30Z	0.145	false
2019-07-17T04:15Z	0.146	false
2019-07-17T04:00Z	0.146	false
2019-07-17T03:45Z	0.145	false
2019-07-17T03:30Z	0.145	false
2019-07-17T03:15Z	0.145	false
2019-07-17T03:00Z	0.145	false
2019-07-17T02:45Z	0.145	false
2019-07-17T02:30Z	0.144	false
2019-07-17T02:15Z	0.145	false
2019-07-17T02:00Z	0.144	false
2019-07-17T01:45Z	0.145	false
2019-07-17T01:30Z	0.145	false
2019-07-17T01:15Z	0.144	false
2019-07-17T01:00Z	0.144	false
2019-07-17T00:45Z	0.143	false
2019-07-17T00:30Z	0.144	false
2019-07-17T00:15Z	0.143	false
2019-07-17T00:00Z	0.144	false
2019-07-16T23:45Z	0.144	false
2019-07-16T23:30Z	0.144	false
2019-07-16T23:15Z	0.142	false
2019-07-16T23:00Z	0.143	false
2019-07-16T22:45Z	0.143	false
2019-07-16T22:30Z	0.143	false
2019-07-16T22:15Z	0.142	false
2019-07-16T22:00Z	0.142	false
2019-07-16T21:45Z	0.142	false
2019-07-16T21:30Z	0.142	false
2019-07-16T21:15Z	0.142	false
2019-07-16T21:00Z	0.142	false
2019-07-16T20:45Z	0.142	false
2019-07-16T20:30Z	0.143	false
2019-07-16T20:15Z	0.143	false
2019-07-16T20:00Z	0.146	false
2019-07-16T19:45Z	0.144	false
2019-07-16T19:30Z	0.143	false
2019-07-16T19:15Z	0.143	false
2019-07-16T19:00Z	0.144	false
2019-07-16T18:45Z	0.144	false
2019-07-16T18:30Z	0.141	false
2019-07-16T18:15Z	0.142	false
2019-07-16T18:00Z	0.124	false
2019-07-16T17:45Z	0.141	false
2019-07-16T17:30Z	0.141	false
2019-07-16T17:15Z	0.142	false
2019-07-16T17:00Z	0.143	false
2019-07-16T16:45Z	0.145	false
2019-07-16T16:30Z	0.144	false
2019-07-16T16:15Z	0.144	false
2019-07-16T16:00Z	0.145	false
2019-07-16T15:45Z	0.145	false
2019-07-16T15:30Z	0.147	false
2019-07-16T15:15Z	0.155	false
2019-07-16T15:00Z	0.152	false
2019-07-16T14:45Z	0.156	false
2019-07-16T14:30Z	0.145	false
2019-07-16T14:15Z	0.144	false
2019-07-16T14:00Z	0.145	false
2019-07-16T13:45Z	0.145	false
2019-07-16T13:30Z	0.145	false
2019-07-16T13:15Z	0.146	false
2019-07-16T13:00Z	0.145	false
2019-07-16T12:45Z	0.145	false
2019-07-16T12:30Z	0.145	false
2019-07-16T12:15Z	0.145	false
2019-07-16T12:00Z	0.145	false
2019-07-16T11:45Z	0.146	false
2019-07-16T11:30Z	0.145	false
2019-07-16T11:15Z	0.15	false
2019-07-16T11:00Z	0.146	false
2019-07-16T10:45Z	0.148	false
2019-07-16T10:30Z	0.148	false
2019-07-16T10:15Z	0.147	false
2019-07-16T10:00Z	0.149	false
2019-07-16T09:45Z	0.15	false
2019-07-16T09:30Z	0.15	false
2019-07-16T09:15Z	0.149	false
2019-07-16T09:00Z	0.149	false
2019-07-16T08:45Z	0.15	false
2019-07-16T08:30Z	0.148	false
2019-07-16T08:15Z	0.148	false
2019-07-16T08:00Z	0.149	false
2019-07-16T07:45Z	0.149	false
2019-07-16T07:30Z	0.148	false
2019-07-16T07:15Z	0.149	false
2019-07-16T07:00Z	0.148	false
2019-07-16T06:45Z	0.149	false
2019-07-16T06:30Z	0.148	false
2019-07-16T06:15Z	0.149	false
2019-07-16T06:00Z	0.148	false
2019-07-16T05:45Z	0.148	false
2019-07-16T05:30Z	0.148	false
2019-07-16T05:15Z	0.148	false
2019-07-16T05:00Z	0.148	false
2019-07-16T04:45Z	0.147	false
2019-07-16T04:30Z	0.148	false
2019-07-16T04:15Z	0.148	false
2019-07-16T04:00Z	0.147	false
2019-07-16T03:45Z	0.148	false
2019-07-16T03:30Z	0.148	false
2019-07-16T03:15Z	0.148	false
2019-07-16T03:00Z	0.148	false
2019-07-16T02:45Z	0.147	false
2019-07-16T02:30Z	0.147	false
2019-07-16T02:15Z	0.147	false
2019-07-16T02:00Z	0.148	false
2019-07-16T01:45Z	0.148	false
2019-07-16T01:30Z	0.147	false
2019-07-16T01:15Z	0.147	false
2019-07-16T01:00Z	0.148	false
2019-07-16T00:45Z	0.147	false
2019-07-16T00:30Z	0.145	false
2019-07-16T00:15Z	0.147	false
2019-07-16T00:00Z	0.147	false
2019-07-15T23:45Z	0.146	false
2019-07-15T23:30Z	0.147	false
2019-07-15T23:15Z	0.147	false
2019-07-15T23:00Z	0.147	false
2019-07-15T22:45Z	0.146	false
2019-07-15T22:30Z	0.146	false
2019-07-15T22:15Z	0.146	false
2019-07-15T22:00Z	0.147	false
2019-07-15T21:45Z	0.146	false
2019-07-15T21:30Z	0.146	false
2019-07-15T21:15Z	0.146	false
2019-07-15T21:00Z	0.145	false
2019-07-15T20:45Z	0.145	false
2019-07-15T20:30Z	0.145	false
2019-07-15T20:15Z	0.145	false
2019-07-15T20:00Z	0.144	false
2019-07-15T19:45Z	0.145	false
2019-07-15T19:30Z	0.145	false
2019-07-15T19:15Z	0.145	false
2019-07-15T19:00Z	0.143	false
2019-07-15T18:45Z	0.143	false
2019-07-15T18:30Z	0.142	false
2019-07-15T18:15Z	0.142	false
2019-07-15T18:00Z	0.143	false
2019-07-15T17:45Z	0.143	false
2019-07-15T17:30Z	0.143	false
2019-07-15T17:15Z	0.143	false
2019-07-15T17:00Z	0.145	false
2019-07-15T16:45Z	0.145	false
2019-07-15T16:30Z	0.145	false
2019-07-15T16:15Z	0.146	false
2019-07-15T16:00Z	0.147	false
2019-07-15T15:45Z	0.147	false
2019-07-15T15:30Z	0.144	false
2019-07-15T15:15Z	0.147	false
2019-07-15T15:00Z	0.145	false
2019-07-15T14:45Z	0.141	false
2019-07-15T14:30Z	0.147	false
2019-07-15T14:15Z	0.146	false
2019-07-15T14:00Z	0.145	false
2019-07-15T13:45Z	0.148	false
2019-07-15T13:30Z	0.145	false
2019-07-15T13:15Z	0.145	false
2019-07-15T13:00Z	0.145	false
2019-07-15T12:45Z	0.145	false
2019-07-15T12:30Z	0.143	false
2019-07-15T12:15Z	0.146	false
2019-07-15T12:00Z	0.146	false
2019-07-15T11:45Z	0.146	false
2019-07-15T11:30Z	0.147	false
2019-07-15T11:15Z	0.152	false
2019-07-15T11:00Z	0.153	false
2019-07-15T10:45Z	0.138	false
2019-07-15T10:30Z	0.166	false
2019-07-15T10:15Z	0.144	false
2019-07-15T10:00Z	0.153	false
2019-07-15T09:45Z	0.151	false
2019-07-15T09:30Z	0.15	false
2019-07-15T09:15Z	0.15	false
2019-07-15T09:00Z	0.15	false
2019-07-15T08:45Z	0.151	false
2019-07-15T08:30Z	0.15	false
2019-07-15T08:15Z	0.151	false
2019-07-15T08:00Z	0.151	false
2019-07-15T07:45Z	0.15	false
2019-07-15T07:30Z	0.15	false
2019-07-15T07:15Z	0.15	false
2019-07-15T07:00Z	0.15	false
2019-07-15T06:45Z	0.15	false
2019-07-15T06:30Z	0.149	false
2019-07-15T06:15Z	0.149	false
2019-07-15T06:00Z	0.155	false
2019-07-15T05:45Z	0.151	false
2019-07-15T05:30Z	0.15	false
2019-07-15T05:15Z	0.151	false
2019-07-15T05:00Z	0.151	false
2019-07-15T04:45Z	0.149	false
2019-07-15T04:30Z	0.15	false
2019-07-15T04:15Z	0.149	false
2019-07-15T04:00Z	0.15	false
2019-07-15T03:45Z	0.15	false
2019-07-15T03:30Z	0.15	false
2019-07-15T03:15Z	0.15	false
2019-07-15T03:00Z	0.149	false
2019-07-15T02:45Z	0.149	false
2019-07-15T02:30Z	0.15	false
2019-07-15T02:15Z	0.149	false
2019-07-15T02:00Z	0.149	false
2019-07-15T01:45Z	0.149	false
2019-07-15T01:30Z	0.149	false
2019-07-15T01:15Z	0.149	false
2019-07-15T01:00Z	0.149	false
2019-07-15T00:45Z	0.149	false
2019-07-15T00:30Z	0.149	false
2019-07-15T00:15Z	0.149	false
2019-07-15T00:00Z	0.148	false
2019-07-14T23:45Z	0.147	false
2019-07-14T23:30Z	0.147	false
2019-07-14T23:15Z	0.147	false
2019-07-14T23:00Z	0.147	false
2019-07-14T22:45Z	0.147	false
2019-07-14T22:30Z	0.147	false
2019-07-14T22:15Z	0.147	false
2019-07-14T22:00Z	0.146	false
2019-07-14T21:45Z	0.146	false
2019-07-14T21:30Z	0.146	false
2019-07-14T21:15Z	0.145	false
2019-07-14T21:00Z	0.145	false
2019-07-14T20:45Z	0.145	false
2019-07-14T20:30Z	0.145	false
2019-07-14T20:15Z	0.145	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
• View your property's long term risk of flooding

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