River level River Thames at Marsh Lock (upstream data)

Check for flood warnings in this area

Latest recorded level 0.29m at 12:45am Saturday 24 July 2021.

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
2021-07-23T23:45Z	0.29	false
2021-07-23T23:30Z	0.29	false
2021-07-23T23:15Z	0.292	false
2021-07-23T23:00Z	0.293	false
2021-07-23T22:45Z	0.294	false
2021-07-23T22:30Z	0.293	false
2021-07-23T22:15Z	0.294	false
2021-07-23T22:00Z	0.293	false
2021-07-23T21:45Z	0.293	false
2021-07-23T21:30Z	0.293	false
2021-07-23T21:15Z	0.293	false
2021-07-23T21:00Z	0.293	false
2021-07-23T20:45Z	0.293	false
2021-07-23T20:30Z	0.294	false
2021-07-23T20:15Z	0.293	false
2021-07-23T20:00Z	0.293	false
2021-07-23T19:45Z	0.293	false
2021-07-23T19:30Z	0.292	false
2021-07-23T19:15Z	0.292	false
2021-07-23T19:00Z	0.293	false
2021-07-23T18:45Z	0.291	false
2021-07-23T18:30Z	0.291	false
2021-07-23T18:15Z	0.294	false
2021-07-23T18:00Z	0.291	false
2021-07-23T17:45Z	0.293	false
2021-07-23T17:30Z	0.292	false
2021-07-23T17:15Z	0.295	false
2021-07-23T17:00Z	0.293	false
2021-07-23T16:45Z	0.293	false
2021-07-23T16:30Z	0.294	false
2021-07-23T16:15Z	0.293	false
2021-07-23T16:00Z	0.294	false
2021-07-23T15:45Z	0.294	false
2021-07-23T15:30Z	0.295	false
2021-07-23T15:15Z	0.295	false
2021-07-23T15:00Z	0.291	false
2021-07-23T14:45Z	0.295	false
2021-07-23T14:30Z	0.293	false
2021-07-23T14:15Z	0.293	false
2021-07-23T14:00Z	0.293	false
2021-07-23T13:45Z	0.294	false
2021-07-23T13:30Z	0.293	false
2021-07-23T13:15Z	0.299	false
2021-07-23T13:00Z	0.298	false
2021-07-23T12:45Z	0.295	false
2021-07-23T12:30Z	0.291	false
2021-07-23T12:15Z	0.296	false
2021-07-23T12:00Z	0.29	false
2021-07-23T11:45Z	0.293	false
2021-07-23T11:30Z	0.288	false
2021-07-23T11:15Z	0.294	false
2021-07-23T11:00Z	0.298	false
2021-07-23T10:45Z	0.297	false
2021-07-23T10:30Z	0.291	false
2021-07-23T10:15Z	0.293	false
2021-07-23T10:00Z	0.29	false
2021-07-23T09:45Z	0.294	false
2021-07-23T09:30Z	0.292	false
2021-07-23T09:15Z	0.289	false
2021-07-23T09:00Z	0.293	false
2021-07-23T08:45Z	0.29	false
2021-07-23T08:30Z	0.292	false
2021-07-23T08:15Z	0.297	false
2021-07-23T08:00Z	0.292	false
2021-07-23T07:45Z	0.285	false
2021-07-23T07:30Z	0.289	false
2021-07-23T07:15Z	0.293	false
2021-07-23T07:00Z	0.291	false
2021-07-23T06:45Z	0.292	false
2021-07-23T06:30Z	0.291	false
2021-07-23T06:15Z	0.291	false
2021-07-23T06:00Z	0.291	false
2021-07-23T05:45Z	0.291	false
2021-07-23T05:30Z	0.292	false
2021-07-23T05:15Z	0.292	false
2021-07-23T05:00Z	0.291	false
2021-07-23T04:45Z	0.292	false
2021-07-23T04:30Z	0.293	false
2021-07-23T04:15Z	0.293	false
2021-07-23T04:00Z	0.292	false
2021-07-23T03:45Z	0.293	false
2021-07-23T03:30Z	0.293	false
2021-07-23T03:15Z	0.294	false
2021-07-23T03:00Z	0.294	false
2021-07-23T02:45Z	0.295	false
2021-07-23T02:30Z	0.294	false
2021-07-23T02:15Z	0.294	false
2021-07-23T02:00Z	0.295	false
2021-07-23T01:45Z	0.296	false
2021-07-23T01:30Z	0.295	false
2021-07-23T01:15Z	0.295	false
2021-07-23T01:00Z	0.296	false
2021-07-23T00:45Z	0.297	false
2021-07-23T00:30Z	0.297	false
2021-07-23T00:15Z	0.298	false
2021-07-23T00:00Z	0.297	false
2021-07-22T23:45Z	0.299	false
2021-07-22T23:30Z	0.299	false
2021-07-22T23:15Z	0.298	false
2021-07-22T23:00Z	0.299	false
2021-07-22T22:45Z	0.298	false
2021-07-22T22:30Z	0.3	false
2021-07-22T22:15Z	0.301	false
2021-07-22T22:00Z	0.299	false
2021-07-22T21:45Z	0.302	false
2021-07-22T21:30Z	0.298	false
2021-07-22T21:15Z	0.3	false
2021-07-22T21:00Z	0.3	false
2021-07-22T20:45Z	0.3	false
2021-07-22T20:30Z	0.299	false
2021-07-22T20:15Z	0.3	false
2021-07-22T20:00Z	0.295	false
2021-07-22T19:45Z	0.301	false
2021-07-22T19:30Z	0.3	false
2021-07-22T19:15Z	0.3	false
2021-07-22T19:00Z	0.3	false
2021-07-22T18:45Z	0.301	false
2021-07-22T18:30Z	0.296	false
2021-07-22T18:15Z	0.3	false
2021-07-22T18:00Z	0.301	false
2021-07-22T17:45Z	0.301	false
2021-07-22T17:30Z	0.305	false
2021-07-22T17:15Z	0.296	false
2021-07-22T17:00Z	0.301	false
2021-07-22T16:45Z	0.288	false
2021-07-22T16:30Z	0.302	false
2021-07-22T16:15Z	0.306	false
2021-07-22T16:00Z	0.304	false
2021-07-22T15:45Z	0.305	false
2021-07-22T15:30Z	0.302	false
2021-07-22T15:15Z	0.298	false
2021-07-22T15:00Z	0.306	false
2021-07-22T14:45Z	0.306	false
2021-07-22T14:30Z	0.303	false
2021-07-22T14:15Z	0.305	false
2021-07-22T14:00Z	0.306	false
2021-07-22T13:45Z	0.303	false
2021-07-22T13:30Z	0.3	false
2021-07-22T13:15Z	0.302	false
2021-07-22T13:00Z	0.297	false
2021-07-22T12:45Z	0.303	false
2021-07-22T12:30Z	0.307	false
2021-07-22T12:15Z	0.306	false
2021-07-22T12:00Z	0.305	false
2021-07-22T11:45Z	0.305	false
2021-07-22T11:30Z	0.302	false
2021-07-22T11:15Z	0.303	false
2021-07-22T11:00Z	0.304	false
2021-07-22T10:45Z	0.302	false
2021-07-22T10:30Z	0.302	false
2021-07-22T10:15Z	0.299	false
2021-07-22T10:00Z	0.304	false
2021-07-22T09:45Z	0.305	false
2021-07-22T09:30Z	0.305	false
2021-07-22T09:15Z	0.302	false
2021-07-22T09:00Z	0.304	false
2021-07-22T08:45Z	0.302	false
2021-07-22T08:30Z	0.306	false
2021-07-22T08:15Z	0.298	false
2021-07-22T08:00Z	0.301	false
2021-07-22T07:45Z	0.301	false
2021-07-22T07:30Z	0.302	false
2021-07-22T07:15Z	0.304	false
2021-07-22T07:00Z	0.303	false
2021-07-22T06:45Z	0.3	false
2021-07-22T06:30Z	0.301	false
2021-07-22T06:15Z	0.301	false
2021-07-22T06:00Z	0.301	false
2021-07-22T05:45Z	0.301	false
2021-07-22T05:30Z	0.301	false
2021-07-22T05:15Z	0.302	false
2021-07-22T05:00Z	0.301	false
2021-07-22T04:45Z	0.301	false
2021-07-22T04:30Z	0.301	false
2021-07-22T04:15Z	0.302	false
2021-07-22T04:00Z	0.302	false
2021-07-22T03:45Z	0.302	false
2021-07-22T03:30Z	0.302	false
2021-07-22T03:15Z	0.303	false
2021-07-22T03:00Z	0.304	false
2021-07-22T02:45Z	0.303	false
2021-07-22T02:30Z	0.304	false
2021-07-22T02:15Z	0.304	false
2021-07-22T02:00Z	0.305	false
2021-07-22T01:45Z	0.305	false
2021-07-22T01:30Z	0.305	false
2021-07-22T01:15Z	0.306	false
2021-07-22T01:00Z	0.306	false
2021-07-22T00:45Z	0.307	false
2021-07-22T00:30Z	0.306	false
2021-07-22T00:15Z	0.307	false
2021-07-22T00:00Z	0.308	false
2021-07-21T23:45Z	0.308	false
2021-07-21T23:30Z	0.31	false
2021-07-21T23:15Z	0.309	false
2021-07-21T23:00Z	0.31	false
2021-07-21T22:45Z	0.31	false
2021-07-21T22:30Z	0.309	false
2021-07-21T22:15Z	0.311	false
2021-07-21T22:00Z	0.311	false
2021-07-21T21:45Z	0.312	false
2021-07-21T21:30Z	0.31	false
2021-07-21T21:15Z	0.31	false
2021-07-21T21:00Z	0.31	false
2021-07-21T20:45Z	0.309	false
2021-07-21T20:30Z	0.309	false
2021-07-21T20:15Z	0.313	false
2021-07-21T20:00Z	0.314	false
2021-07-21T19:45Z	0.31	false
2021-07-21T19:30Z	0.31	false
2021-07-21T19:15Z	0.311	false
2021-07-21T19:00Z	0.313	false
2021-07-21T18:45Z	0.31	false
2021-07-21T18:30Z	0.309	false
2021-07-21T18:15Z	0.309	false
2021-07-21T18:00Z	0.308	false
2021-07-21T17:45Z	0.308	false
2021-07-21T17:30Z	0.311	false
2021-07-21T17:15Z	0.309	false
2021-07-21T17:00Z	0.315	false
2021-07-21T16:45Z	0.311	false
2021-07-21T16:30Z	0.317	false
2021-07-21T16:15Z	0.311	false
2021-07-21T16:00Z	0.314	false
2021-07-21T15:45Z	0.313	false
2021-07-21T15:30Z	0.314	false
2021-07-21T15:15Z	0.313	false
2021-07-21T15:00Z	0.315	false
2021-07-21T14:45Z	0.317	false
2021-07-21T14:30Z	0.318	false
2021-07-21T14:15Z	0.311	false
2021-07-21T14:00Z	0.316	false
2021-07-21T13:45Z	0.31	false
2021-07-21T13:30Z	0.315	false
2021-07-21T13:15Z	0.311	false
2021-07-21T13:00Z	0.314	false
2021-07-21T12:45Z	0.316	false
2021-07-21T12:30Z	0.315	false
2021-07-21T12:15Z	0.314	false
2021-07-21T12:00Z	0.307	false
2021-07-21T11:45Z	0.317	false
2021-07-21T11:30Z	0.325	false
2021-07-21T11:15Z	0.321	false
2021-07-21T11:00Z	0.315	false
2021-07-21T10:45Z	0.315	false
2021-07-21T10:30Z	0.319	false
2021-07-21T10:15Z	0.312	false
2021-07-21T10:00Z	0.314	false
2021-07-21T09:45Z	0.319	false
2021-07-21T09:30Z	0.311	false
2021-07-21T09:15Z	0.319	false
2021-07-21T09:00Z	0.318	false
2021-07-21T08:45Z	0.312	false
2021-07-21T08:30Z	0.313	false
2021-07-21T08:15Z	0.317	false
2021-07-21T08:00Z	0.311	false
2021-07-21T07:45Z	0.312	false
2021-07-21T07:30Z	0.316	false
2021-07-21T07:15Z	0.312	false
2021-07-21T07:00Z	0.314	false
2021-07-21T06:45Z	0.311	false
2021-07-21T06:30Z	0.312	false
2021-07-21T06:15Z	0.311	false
2021-07-21T06:00Z	0.313	false
2021-07-21T05:45Z	0.312	false
2021-07-21T05:30Z	0.312	false
2021-07-21T05:15Z	0.314	false
2021-07-21T05:00Z	0.314	false
2021-07-21T04:45Z	0.314	false
2021-07-21T04:30Z	0.315	false
2021-07-21T04:15Z	0.315	false
2021-07-21T04:00Z	0.314	false
2021-07-21T03:45Z	0.313	false
2021-07-21T03:30Z	0.316	false
2021-07-21T03:15Z	0.316	false
2021-07-21T03:00Z	0.316	false
2021-07-21T02:45Z	0.316	false
2021-07-21T02:30Z	0.316	false
2021-07-21T02:15Z	0.317	false
2021-07-21T02:00Z	0.317	false
2021-07-21T01:45Z	0.317	false
2021-07-21T01:30Z	0.317	false
2021-07-21T01:15Z	0.318	false
2021-07-21T01:00Z	0.318	false
2021-07-21T00:45Z	0.318	false
2021-07-21T00:30Z	0.318	false
2021-07-21T00:15Z	0.318	false
2021-07-21T00:00Z	0.32	false
2021-07-20T23:45Z	0.32	false
2021-07-20T23:30Z	0.32	false
2021-07-20T23:15Z	0.32	false
2021-07-20T23:00Z	0.32	false
2021-07-20T22:45Z	0.32	false
2021-07-20T22:30Z	0.319	false
2021-07-20T22:15Z	0.32	false
2021-07-20T22:00Z	0.32	false
2021-07-20T21:45Z	0.32	false
2021-07-20T21:30Z	0.32	false
2021-07-20T21:15Z	0.321	false
2021-07-20T21:00Z	0.321	false
2021-07-20T20:45Z	0.318	false
2021-07-20T20:30Z	0.32	false
2021-07-20T20:15Z	0.322	false
2021-07-20T20:00Z	0.319	false
2021-07-20T19:45Z	0.321	false
2021-07-20T19:30Z	0.319	false
2021-07-20T19:15Z	0.324	false
2021-07-20T19:00Z	0.32	false
2021-07-20T18:45Z	0.321	false
2021-07-20T18:30Z	0.322	false
2021-07-20T18:15Z	0.323	false
2021-07-20T18:00Z	0.323	false
2021-07-20T17:45Z	0.324	false
2021-07-20T17:30Z	0.325	false
2021-07-20T17:15Z	0.326	false
2021-07-20T17:00Z	0.326	false
2021-07-20T16:45Z	0.323	false
2021-07-20T16:30Z	0.322	false
2021-07-20T16:15Z	0.326	false
2021-07-20T16:00Z	0.324	false
2021-07-20T15:45Z	0.325	false
2021-07-20T15:30Z	0.326	false
2021-07-20T15:15Z	0.321	false
2021-07-20T15:00Z	0.32	false
2021-07-20T14:45Z	0.323	false
2021-07-20T14:30Z	0.325	false
2021-07-20T14:15Z	0.322	false
2021-07-20T14:00Z	0.323	false
2021-07-20T13:45Z	0.325	false
2021-07-20T13:30Z	0.327	false
2021-07-20T13:15Z	0.325	false
2021-07-20T13:00Z	0.325	false
2021-07-20T12:45Z	0.328	false
2021-07-20T12:30Z	0.325	false
2021-07-20T12:15Z	0.326	false
2021-07-20T12:00Z	0.324	false
2021-07-20T11:45Z	0.332	false
2021-07-20T11:30Z	0.328	false
2021-07-20T11:15Z	0.324	false
2021-07-20T11:00Z	0.324	false
2021-07-20T10:45Z	0.326	false
2021-07-20T10:30Z	0.326	false
2021-07-20T10:15Z	0.325	false
2021-07-20T10:00Z	0.321	false
2021-07-20T09:45Z	0.321	false
2021-07-20T09:30Z	0.321	false
2021-07-20T09:15Z	0.32	false
2021-07-20T09:00Z	0.321	false
2021-07-20T08:45Z	0.318	false
2021-07-20T08:30Z	0.319	false
2021-07-20T08:15Z	0.319	false
2021-07-20T08:00Z	0.318	false
2021-07-20T07:45Z	0.317	false
2021-07-20T07:30Z	0.315	false
2021-07-20T07:15Z	0.312	false
2021-07-20T07:00Z	0.312	false
2021-07-20T06:45Z	0.31	false
2021-07-20T06:30Z	0.312	false
2021-07-20T06:15Z	0.312	false
2021-07-20T06:00Z	0.312	false
2021-07-20T05:45Z	0.311	false
2021-07-20T05:30Z	0.311	false
2021-07-20T05:15Z	0.312	false
2021-07-20T05:00Z	0.312	false
2021-07-20T04:45Z	0.312	false
2021-07-20T04:30Z	0.312	false
2021-07-20T04:15Z	0.313	false
2021-07-20T04:00Z	0.313	false
2021-07-20T03:45Z	0.312	false
2021-07-20T03:30Z	0.313	false
2021-07-20T03:15Z	0.314	false
2021-07-20T03:00Z	0.313	false
2021-07-20T02:45Z	0.312	false
2021-07-20T02:30Z	0.313	false
2021-07-20T02:15Z	0.313	false
2021-07-20T02:00Z	0.314	false
2021-07-20T01:45Z	0.314	false
2021-07-20T01:30Z	0.313	false
2021-07-20T01:15Z	0.314	false
2021-07-20T01:00Z	0.314	false
2021-07-20T00:45Z	0.315	false
2021-07-20T00:30Z	0.315	false
2021-07-20T00:15Z	0.315	false
2021-07-20T00:00Z	0.314	false
2021-07-19T23:45Z	0.314	false
2021-07-19T23:30Z	0.314	false
2021-07-19T23:15Z	0.314	false
2021-07-19T23:00Z	0.314	false
2021-07-19T22:45Z	0.314	false
2021-07-19T22:30Z	0.315	false
2021-07-19T22:15Z	0.317	false
2021-07-19T22:00Z	0.315	false
2021-07-19T21:45Z	0.315	false
2021-07-19T21:30Z	0.316	false
2021-07-19T21:15Z	0.314	false
2021-07-19T21:00Z	0.314	false
2021-07-19T20:45Z	0.314	false
2021-07-19T20:30Z	0.321	false
2021-07-19T20:15Z	0.31	false
2021-07-19T20:00Z	0.32	false
2021-07-19T19:45Z	0.32	false
2021-07-19T19:30Z	0.318	false
2021-07-19T19:15Z	0.318	false
2021-07-19T19:00Z	0.314	false
2021-07-19T18:45Z	0.319	false
2021-07-19T18:30Z	0.322	false
2021-07-19T18:15Z	0.322	false
2021-07-19T18:00Z	0.32	false
2021-07-19T17:45Z	0.318	false
2021-07-19T17:30Z	0.32	false
2021-07-19T17:15Z	0.32	false
2021-07-19T17:00Z	0.324	false
2021-07-19T16:45Z	0.314	false
2021-07-19T16:30Z	0.321	false
2021-07-19T16:15Z	0.32	false
2021-07-19T16:00Z	0.324	false
2021-07-19T15:45Z	0.32	false
2021-07-19T15:30Z	0.323	false
2021-07-19T15:15Z	0.324	false
2021-07-19T15:00Z	0.309	false
2021-07-19T14:45Z	0.306	false
2021-07-19T14:30Z	0.317	false
2021-07-19T14:15Z	0.313	false
2021-07-19T14:00Z	0.32	false
2021-07-19T13:45Z	0.32	false
2021-07-19T13:30Z	0.316	false
2021-07-19T13:15Z	0.322	false
2021-07-19T13:00Z	0.309	false
2021-07-19T12:45Z	0.321	false
2021-07-19T12:30Z	0.309	false
2021-07-19T12:15Z	0.321	false
2021-07-19T12:00Z	0.322	false
2021-07-19T11:45Z	0.32	false
2021-07-19T11:30Z	0.325	false
2021-07-19T11:15Z	0.319	false
2021-07-19T11:00Z	0.322	false
2021-07-19T10:45Z	0.31	false
2021-07-19T10:30Z	0.32	false
2021-07-19T10:15Z	0.319	false
2021-07-19T10:00Z	0.316	false
2021-07-19T09:45Z	0.318	false
2021-07-19T09:30Z	0.318	false
2021-07-19T09:15Z	0.317	false
2021-07-19T09:00Z	0.312	false
2021-07-19T08:45Z	0.315	false
2021-07-19T08:30Z	0.315	false
2021-07-19T08:15Z	0.314	false
2021-07-19T08:00Z	0.314	false
2021-07-19T07:45Z	0.314	false
2021-07-19T07:30Z	0.314	false
2021-07-19T07:15Z	0.311	false
2021-07-19T07:00Z	0.313	false
2021-07-19T06:45Z	0.313	false
2021-07-19T06:30Z	0.313	false
2021-07-19T06:15Z	0.312	false
2021-07-19T06:00Z	0.315	false
2021-07-19T05:45Z	0.311	false
2021-07-19T05:30Z	0.311	false
2021-07-19T05:15Z	0.31	false
2021-07-19T05:00Z	0.31	false
2021-07-19T04:45Z	0.311	false
2021-07-19T04:30Z	0.31	false
2021-07-19T04:15Z	0.309	false
2021-07-19T04:00Z	0.31	false
2021-07-19T03:45Z	0.31	false
2021-07-19T03:30Z	0.309	false
2021-07-19T03:15Z	0.309	false
2021-07-19T03:00Z	0.309	false
2021-07-19T02:45Z	0.308	false
2021-07-19T02:30Z	0.308	false
2021-07-19T02:15Z	0.308	false
2021-07-19T02:00Z	0.309	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
• Check the long term flood risk for an area in England.

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