River level River Thames at Grafton Lock (upstream 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 0.38m at 9:00pm Tuesday 25 February 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
2020-02-25T21:00Z	0.384	false
2020-02-25T20:45Z	0.38	false
2020-02-25T20:30Z	0.407	false
2020-02-25T20:15Z	0.388	false
2020-02-25T20:00Z	0.388	false
2020-02-25T19:45Z	0.377	false
2020-02-25T19:30Z	0.39	false
2020-02-25T19:15Z	0.387	false
2020-02-25T19:00Z	0.39	false
2020-02-25T18:45Z	0.397	false
2020-02-25T18:30Z	0.391	false
2020-02-25T18:15Z	0.397	false
2020-02-25T18:00Z	0.405	false
2020-02-25T17:45Z	0.389	false
2020-02-25T17:30Z	0.39	false
2020-02-25T17:15Z	0.378	false
2020-02-25T17:00Z	0.402	false
2020-02-25T16:45Z	0.399	false
2020-02-25T16:30Z	0.378	false
2020-02-25T16:15Z	0.393	false
2020-02-25T16:00Z	0.385	false
2020-02-25T15:45Z	0.394	false
2020-02-25T15:30Z	0.391	false
2020-02-25T15:15Z	0.378	false
2020-02-25T15:00Z	0.399	false
2020-02-25T14:45Z	0.388	false
2020-02-25T14:30Z	0.378	false
2020-02-25T14:15Z	0.392	false
2020-02-25T14:00Z	0.386	false
2020-02-25T13:45Z	0.386	false
2020-02-25T13:30Z	0.38	false
2020-02-25T13:15Z	0.383	false
2020-02-25T13:00Z	0.397	false
2020-02-25T12:45Z	0.375	false
2020-02-25T12:30Z	0.38	false
2020-02-25T12:15Z	0.377	false
2020-02-25T12:00Z	0.389	false
2020-02-25T11:45Z	0.368	false
2020-02-25T11:30Z	0.377	false
2020-02-25T11:15Z	0.381	false
2020-02-25T11:00Z	0.383	false
2020-02-25T10:45Z	0.384	false
2020-02-25T10:30Z	0.368	false
2020-02-25T10:15Z	0.377	false
2020-02-25T10:00Z	0.37	false
2020-02-25T09:45Z	0.372	false
2020-02-25T09:30Z	0.366	false
2020-02-25T09:15Z	0.375	false
2020-02-25T09:00Z	0.371	false
2020-02-25T08:45Z	0.376	false
2020-02-25T08:30Z	0.355	false
2020-02-25T08:15Z	0.355	false
2020-02-25T08:00Z	0.361	false
2020-02-25T07:45Z	0.358	false
2020-02-25T07:30Z	0.357	false
2020-02-25T07:15Z	0.363	false
2020-02-25T07:00Z	0.356	false
2020-02-25T06:45Z	0.355	false
2020-02-25T06:30Z	0.35	false
2020-02-25T06:15Z	0.358	false
2020-02-25T06:00Z	0.359	false
2020-02-25T05:45Z	0.367	false
2020-02-25T05:30Z	0.355	false
2020-02-25T05:15Z	0.355	false
2020-02-25T05:00Z	0.355	false
2020-02-25T04:45Z	0.36	false
2020-02-25T04:30Z	0.346	false
2020-02-25T04:15Z	0.358	false
2020-02-25T04:00Z	0.353	false
2020-02-25T03:45Z	0.352	false
2020-02-25T03:30Z	0.348	false
2020-02-25T03:15Z	0.357	false
2020-02-25T03:00Z	0.351	false
2020-02-25T02:45Z	0.345	false
2020-02-25T02:30Z	0.368	false
2020-02-25T02:15Z	0.355	false
2020-02-25T02:00Z	0.339	false
2020-02-25T01:45Z	0.341	false
2020-02-25T01:30Z	0.358	false
2020-02-25T01:15Z	0.362	false
2020-02-25T01:00Z	0.362	false
2020-02-25T00:45Z	0.361	false
2020-02-25T00:30Z	0.363	false
2020-02-25T00:15Z	0.347	false
2020-02-25T00:00Z	0.343	false
2020-02-24T23:45Z	0.351	false
2020-02-24T23:30Z	0.349	false
2020-02-24T23:15Z	0.366	false
2020-02-24T23:00Z	0.361	false
2020-02-24T22:45Z	0.358	false
2020-02-24T22:30Z	0.36	false
2020-02-24T22:15Z	0.352	false
2020-02-24T22:00Z	0.347	false
2020-02-24T21:45Z	0.353	false
2020-02-24T21:30Z	0.362	false
2020-02-24T21:15Z	0.35	false
2020-02-24T21:00Z	0.353	false
2020-02-24T20:45Z	0.361	false
2020-02-24T20:30Z	0.362	false
2020-02-24T20:15Z	0.349	false
2020-02-24T20:00Z	0.349	false
2020-02-24T19:45Z	0.359	false
2020-02-24T19:30Z	0.346	false
2020-02-24T19:15Z	0.362	false
2020-02-24T19:00Z	0.34	false
2020-02-24T18:45Z	0.367	false
2020-02-24T18:30Z	0.365	false
2020-02-24T18:15Z	0.357	false
2020-02-24T18:00Z	0.364	false
2020-02-24T17:45Z	0.354	false
2020-02-24T17:30Z	0.349	false
2020-02-24T17:15Z	0.362	false
2020-02-24T17:00Z	0.363	false
2020-02-24T16:45Z	0.339	false
2020-02-24T16:30Z	0.344	false
2020-02-24T16:15Z	0.364	false
2020-02-24T16:00Z	0.36	false
2020-02-24T15:45Z	0.347	false
2020-02-24T15:30Z	0.369	false
2020-02-24T15:15Z	0.362	false
2020-02-24T15:00Z	0.348	false
2020-02-24T14:45Z	0.352	false
2020-02-24T14:30Z	0.355	false
2020-02-24T14:15Z	0.343	false
2020-02-24T14:00Z	0.354	false
2020-02-24T13:45Z	0.347	false
2020-02-24T13:30Z	0.349	false
2020-02-24T13:15Z	0.358	false
2020-02-24T13:00Z	0.348	false
2020-02-24T12:45Z	0.34	false
2020-02-24T12:30Z	0.356	false
2020-02-24T12:15Z	0.351	false
2020-02-24T12:00Z	0.357	false
2020-02-24T11:45Z	0.339	false
2020-02-24T11:30Z	0.355	false
2020-02-24T11:15Z	0.339	false
2020-02-24T11:00Z	0.337	false
2020-02-24T10:45Z	0.341	false
2020-02-24T10:30Z	0.344	false
2020-02-24T10:15Z	0.343	false
2020-02-24T10:00Z	0.347	false
2020-02-24T09:45Z	0.353	false
2020-02-24T09:30Z	0.344	false
2020-02-24T09:15Z	0.347	false
2020-02-24T09:00Z	0.333	false
2020-02-24T08:45Z	0.348	false
2020-02-24T08:30Z	0.346	false
2020-02-24T08:15Z	0.347	false
2020-02-24T08:00Z	0.34	false
2020-02-24T07:45Z	0.322	false
2020-02-24T07:30Z	0.342	false
2020-02-24T07:15Z	0.337	false
2020-02-24T07:00Z	0.334	false
2020-02-24T06:45Z	0.336	false
2020-02-24T06:30Z	0.328	false
2020-02-24T06:15Z	0.34	false
2020-02-24T06:00Z	0.337	false
2020-02-24T05:45Z	0.333	false
2020-02-24T05:30Z	0.338	false
2020-02-24T05:15Z	0.34	false
2020-02-24T05:00Z	0.343	false
2020-02-24T04:45Z	0.329	false
2020-02-24T04:30Z	0.324	false
2020-02-24T04:15Z	0.333	false
2020-02-24T04:00Z	0.334	false
2020-02-24T03:45Z	0.318	false
2020-02-24T03:30Z	0.323	false
2020-02-24T03:15Z	0.326	false
2020-02-24T03:00Z	0.322	false
2020-02-24T02:45Z	0.317	false
2020-02-24T02:30Z	0.312	false
2020-02-24T02:15Z	0.311	false
2020-02-24T02:00Z	0.319	false
2020-02-24T01:45Z	0.312	false
2020-02-24T01:30Z	0.323	false
2020-02-24T01:15Z	0.315	false
2020-02-24T01:00Z	0.317	false
2020-02-24T00:45Z	0.31	false
2020-02-24T00:30Z	0.309	false
2020-02-24T00:15Z	0.314	false
2020-02-24T00:00Z	0.301	false
2020-02-23T23:45Z	0.312	false
2020-02-23T23:30Z	0.321	false
2020-02-23T23:15Z	0.303	false
2020-02-23T23:00Z	0.308	false
2020-02-23T22:45Z	0.317	false
2020-02-23T22:30Z	0.309	false
2020-02-23T22:15Z	0.308	false
2020-02-23T22:00Z	0.324	false
2020-02-23T21:45Z	0.31	false
2020-02-23T21:30Z	0.303	false
2020-02-23T21:15Z	0.305	false
2020-02-23T21:00Z	0.32	false
2020-02-23T20:45Z	0.301	false
2020-02-23T20:30Z	0.311	false
2020-02-23T20:15Z	0.303	false
2020-02-23T20:00Z	0.307	false
2020-02-23T19:45Z	0.317	false
2020-02-23T19:30Z	0.292	false
2020-02-23T19:15Z	0.307	false
2020-02-23T19:00Z	0.305	false
2020-02-23T18:45Z	0.31	false
2020-02-23T18:30Z	0.31	false
2020-02-23T18:15Z	0.316	false
2020-02-23T18:00Z	0.308	false
2020-02-23T17:45Z	0.305	false
2020-02-23T17:30Z	0.303	false
2020-02-23T17:15Z	0.31	false
2020-02-23T17:00Z	0.303	false
2020-02-23T16:45Z	0.31	false
2020-02-23T16:30Z	0.304	false
2020-02-23T16:15Z	0.307	false
2020-02-23T16:00Z	0.314	false
2020-02-23T15:45Z	0.304	false
2020-02-23T15:30Z	0.311	false
2020-02-23T15:15Z	0.308	false
2020-02-23T15:00Z	0.313	false
2020-02-23T14:45Z	0.305	false
2020-02-23T14:30Z	0.304	false
2020-02-23T14:15Z	0.308	false
2020-02-23T14:00Z	0.308	false
2020-02-23T13:45Z	0.309	false
2020-02-23T13:30Z	0.309	false
2020-02-23T13:15Z	0.341	false
2020-02-23T13:00Z	0.307	false
2020-02-23T12:45Z	0.322	false
2020-02-23T12:30Z	0.31	false
2020-02-23T12:15Z	0.326	false
2020-02-23T12:00Z	0.313	false
2020-02-23T11:45Z	0.313	false
2020-02-23T11:30Z	0.311	false
2020-02-23T11:15Z	0.321	false
2020-02-23T11:00Z	0.319	false
2020-02-23T10:45Z	0.32	false
2020-02-23T10:30Z	0.318	false
2020-02-23T10:15Z	0.319	false
2020-02-23T10:00Z	0.322	false
2020-02-23T09:45Z	0.313	false
2020-02-23T09:30Z	0.334	false
2020-02-23T09:15Z	0.308	false
2020-02-23T09:00Z	0.321	false
2020-02-23T08:45Z	0.317	false
2020-02-23T08:30Z	0.318	false
2020-02-23T08:15Z	0.329	false
2020-02-23T08:00Z	0.319	false
2020-02-23T07:45Z	0.321	false
2020-02-23T07:30Z	0.315	false
2020-02-23T07:15Z	0.308	false
2020-02-23T07:00Z	0.316	false
2020-02-23T06:45Z	0.309	false
2020-02-23T06:30Z	0.32	false
2020-02-23T06:15Z	0.326	false
2020-02-23T06:00Z	0.31	false
2020-02-23T05:45Z	0.324	false
2020-02-23T05:30Z	0.306	false
2020-02-23T05:15Z	0.319	false
2020-02-23T05:00Z	0.313	false
2020-02-23T04:45Z	0.311	false
2020-02-23T04:30Z	0.314	false
2020-02-23T04:15Z	0.33	false
2020-02-23T04:00Z	0.329	false
2020-02-23T03:45Z	0.328	false
2020-02-23T03:30Z	0.318	false
2020-02-23T03:15Z	0.325	false
2020-02-23T03:00Z	0.317	false
2020-02-23T02:45Z	0.316	false
2020-02-23T02:30Z	0.321	false
2020-02-23T02:15Z	0.312	false
2020-02-23T02:00Z	0.312	false
2020-02-23T01:45Z	0.327	false
2020-02-23T01:30Z	0.326	false
2020-02-23T01:15Z	0.324	false
2020-02-23T01:00Z	0.335	false
2020-02-23T00:45Z	0.328	false
2020-02-23T00:30Z	0.318	false
2020-02-23T00:15Z	0.332	false
2020-02-23T00:00Z	0.33	false
2020-02-22T23:45Z	0.329	false
2020-02-22T23:30Z	0.325	false
2020-02-22T23:15Z	0.329	false
2020-02-22T23:00Z	0.336	false
2020-02-22T22:45Z	0.337	false
2020-02-22T22:30Z	0.338	false
2020-02-22T22:15Z	0.33	false
2020-02-22T22:00Z	0.334	false
2020-02-22T21:45Z	0.346	false
2020-02-22T21:30Z	0.35	false
2020-02-22T21:15Z	0.35	false
2020-02-22T21:00Z	0.356	false
2020-02-22T20:45Z	0.342	false
2020-02-22T20:30Z	0.348	false
2020-02-22T20:15Z	0.35	false
2020-02-22T20:00Z	0.354	false
2020-02-22T19:45Z	0.355	false
2020-02-22T19:30Z	0.368	false
2020-02-22T19:15Z	0.371	false
2020-02-22T19:00Z	0.365	false
2020-02-22T18:45Z	0.367	false
2020-02-22T18:30Z	0.369	false
2020-02-22T18:15Z	0.37	false
2020-02-22T18:00Z	0.373	false
2020-02-22T17:45Z	0.383	false
2020-02-22T17:30Z	0.381	false
2020-02-22T17:15Z	0.375	false
2020-02-22T17:00Z	0.369	false
2020-02-22T16:45Z	0.388	false
2020-02-22T16:30Z	0.376	false
2020-02-22T16:15Z	0.372	false
2020-02-22T16:00Z	0.389	false
2020-02-22T15:45Z	0.388	false
2020-02-22T15:30Z	0.381	false
2020-02-22T15:15Z	0.389	false
2020-02-22T15:00Z	0.398	false
2020-02-22T14:45Z	0.396	false
2020-02-22T14:30Z	0.402	false
2020-02-22T14:15Z	0.404	false
2020-02-22T14:00Z	0.403	false
2020-02-22T13:45Z	0.4	false
2020-02-22T13:30Z	0.414	false
2020-02-22T13:15Z	0.403	false
2020-02-22T13:00Z	0.39	false
2020-02-22T12:45Z	0.409	false
2020-02-22T12:30Z	0.407	false
2020-02-22T12:15Z	0.404	false
2020-02-22T12:00Z	0.403	false
2020-02-22T11:45Z	0.431	false
2020-02-22T11:30Z	0.409	false
2020-02-22T11:15Z	0.415	false
2020-02-22T11:00Z	0.426	false
2020-02-22T10:45Z	0.419	false
2020-02-22T10:30Z	0.416	false
2020-02-22T10:15Z	0.424	false
2020-02-22T10:00Z	0.422	false
2020-02-22T09:45Z	0.442	false
2020-02-22T09:30Z	0.427	false
2020-02-22T09:15Z	0.44	false
2020-02-22T09:00Z	0.436	false
2020-02-22T08:45Z	0.441	false
2020-02-22T08:30Z	0.444	false
2020-02-22T08:15Z	0.441	false
2020-02-22T08:00Z	0.428	false
2020-02-22T07:45Z	0.43	false
2020-02-22T07:30Z	0.442	false
2020-02-22T07:15Z	0.447	false
2020-02-22T07:00Z	0.447	false
2020-02-22T06:45Z	0.441	false
2020-02-22T06:30Z	0.452	false
2020-02-22T06:15Z	0.452	false
2020-02-22T06:00Z	0.453	false
2020-02-22T05:45Z	0.445	false
2020-02-22T05:30Z	0.447	false
2020-02-22T05:15Z	0.458	false
2020-02-22T05:00Z	0.457	false
2020-02-22T04:45Z	0.458	false
2020-02-22T04:30Z	0.47	false
2020-02-22T04:15Z	0.467	false
2020-02-22T04:00Z	0.461	false
2020-02-22T03:45Z	0.461	false
2020-02-22T03:30Z	0.456	false
2020-02-22T03:15Z	0.468	false
2020-02-22T03:00Z	0.465	false
2020-02-22T02:45Z	0.466	false
2020-02-22T02:30Z	0.469	false
2020-02-22T02:15Z	0.482	false
2020-02-22T02:00Z	0.474	false
2020-02-22T01:45Z	0.47	false
2020-02-22T01:30Z	0.462	false
2020-02-22T01:15Z	0.469	false
2020-02-22T01:00Z	0.476	false
2020-02-22T00:45Z	0.476	false
2020-02-22T00:30Z	0.492	false
2020-02-22T00:15Z	0.486	false
2020-02-22T00:00Z	0.476	false
2020-02-21T23:45Z	0.497	false
2020-02-21T23:30Z	0.489	false
2020-02-21T23:15Z	0.481	false
2020-02-21T23:00Z	0.486	false
2020-02-21T22:45Z	0.502	false
2020-02-21T22:30Z	0.493	false
2020-02-21T22:15Z	0.488	false
2020-02-21T22:00Z	0.494	false
2020-02-21T21:45Z	0.514	false
2020-02-21T21:30Z	0.48	false
2020-02-21T21:15Z	0.489	false
2020-02-21T21:00Z	0.5	false
2020-02-21T20:45Z	0.501	false
2020-02-21T20:30Z	0.508	false
2020-02-21T20:15Z	0.507	false
2020-02-21T20:00Z	0.494	false
2020-02-21T19:45Z	0.503	false
2020-02-21T19:30Z	0.499	false
2020-02-21T19:15Z	0.503	false
2020-02-21T19:00Z	0.498	false
2020-02-21T18:45Z	0.498	false
2020-02-21T18:30Z	0.494	false
2020-02-21T18:15Z	0.516	false
2020-02-21T18:00Z	0.515	false
2020-02-21T17:45Z	0.51	false
2020-02-21T17:30Z	0.518	false
2020-02-21T17:15Z	0.522	false
2020-02-21T17:00Z	0.514	false
2020-02-21T16:45Z	0.521	false
2020-02-21T16:30Z	0.534	false
2020-02-21T16:15Z	0.521	false
2020-02-21T16:00Z	0.54	false
2020-02-21T15:45Z	0.526	false
2020-02-21T15:30Z	0.531	false
2020-02-21T15:15Z	0.532	false
2020-02-21T15:00Z	0.535	false
2020-02-21T14:45Z	0.535	false
2020-02-21T14:30Z	0.518	false
2020-02-21T14:15Z	0.529	false
2020-02-21T14:00Z	0.524	false
2020-02-21T13:45Z	0.523	false
2020-02-21T13:30Z	0.521	false
2020-02-21T13:15Z	0.529	false
2020-02-21T13:00Z	0.541	false
2020-02-21T12:45Z	0.54	false
2020-02-21T12:30Z	0.525	false
2020-02-21T12:15Z	0.54	false
2020-02-21T12:00Z	0.532	false
2020-02-21T11:45Z	0.533	false
2020-02-21T11:30Z	0.55	false
2020-02-21T11:15Z	0.544	false
2020-02-21T11:00Z	0.543	false
2020-02-21T10:45Z	0.545	false
2020-02-21T10:30Z	0.541	false
2020-02-21T10:15Z	0.55	false
2020-02-21T10:00Z	0.551	false
2020-02-21T09:45Z	0.561	false
2020-02-21T09:30Z	0.558	false
2020-02-21T09:15Z	0.558	false
2020-02-21T09:00Z	0.548	false
2020-02-21T08:45Z	0.543	false
2020-02-21T08:30Z	0.555	false
2020-02-21T08:15Z	0.561	false
2020-02-21T08:00Z	0.542	false
2020-02-21T07:45Z	0.57	false
2020-02-21T07:30Z	0.549	false
2020-02-21T07:15Z	0.555	false
2020-02-21T07:00Z	0.552	false
2020-02-21T06:45Z	0.557	false
2020-02-21T06:30Z	0.569	false
2020-02-21T06:15Z	0.545	false
2020-02-21T06:00Z	0.557	false
2020-02-21T05:45Z	0.553	false
2020-02-21T05:30Z	0.56	false
2020-02-21T05:15Z	0.564	false
2020-02-21T05:00Z	0.559	false
2020-02-21T04:45Z	0.556	false
2020-02-21T04:30Z	0.58	false
2020-02-21T04:15Z	0.574	false
2020-02-21T04:00Z	0.573	false
2020-02-21T03:45Z	0.578	false
2020-02-21T03:30Z	0.576	false
2020-02-21T03:15Z	0.577	false
2020-02-21T03:00Z	0.573	false
2020-02-21T02:45Z	0.579	false
2020-02-21T02:30Z	0.581	false
2020-02-21T02:15Z	0.587	false
2020-02-21T02:00Z	0.574	false
2020-02-21T01:45Z	0.59	false
2020-02-21T01:30Z	0.588	false
2020-02-21T01:15Z	0.603	false
2020-02-21T01:00Z	0.587	false
2020-02-21T00:45Z	0.59	false
2020-02-21T00:30Z	0.587	false
2020-02-21T00:15Z	0.603	false
2020-02-21T00:00Z	0.602	false
2020-02-20T23:45Z	0.606	false
2020-02-20T23:30Z	0.605	false
2020-02-20T23:15Z	0.59	false
2020-02-20T23:00Z	0.595	false
2020-02-20T22:45Z	0.592	false
2020-02-20T22:30Z	0.603	false
2020-02-20T22:15Z	0.594	false
2020-02-20T22:00Z	0.597	false
2020-02-20T21:45Z	0.584	false
2020-02-20T21:30Z	0.598	false
2020-02-20T21:15Z	0.606	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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