River level River Thames at Marsh Lock (downstream 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 3.25m at 12:45pm Monday 17 February 2020.

View upstream 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 3.02m 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
2020-02-17T12:45Z	3.249	false
2020-02-17T12:30Z	3.23	false
2020-02-17T12:15Z	3.236	false
2020-02-17T12:00Z	3.231	false
2020-02-17T11:45Z	3.22	false
2020-02-17T11:30Z	3.23	false
2020-02-17T11:15Z	3.216	false
2020-02-17T11:00Z	3.115	false
2020-02-17T10:45Z	2.683	false
2020-02-17T10:30Z	2.683	false
2020-02-17T10:15Z	2.683	false
2020-02-17T10:00Z	2.683	false
2020-02-17T09:45Z	2.683	false
2020-02-17T09:30Z	2.683	false
2020-02-17T09:15Z	2.683	false
2020-02-17T09:00Z	2.683	false
2020-02-17T08:45Z	2.683	false
2020-02-17T08:30Z	2.683	false
2020-02-17T08:15Z	2.683	false
2020-02-17T08:00Z	2.683	false
2020-02-17T07:45Z	2.683	false
2020-02-17T07:30Z	2.683	false
2020-02-17T07:15Z	2.683	false
2020-02-17T07:00Z	2.683	false
2020-02-17T06:45Z	2.683	false
2020-02-17T06:30Z	2.683	false
2020-02-17T06:15Z	2.683	false
2020-02-17T06:00Z	2.683	false
2020-02-17T05:45Z	2.683	false
2020-02-17T05:30Z	2.683	false
2020-02-17T05:15Z	2.683	false
2020-02-17T05:00Z	2.683	false
2020-02-17T04:45Z	2.683	false
2020-02-17T04:30Z	2.683	false
2020-02-17T04:15Z	2.683	false
2020-02-17T04:00Z	2.683	false
2020-02-17T03:45Z	2.683	false
2020-02-17T03:30Z	2.683	false
2020-02-17T03:15Z	2.683	false
2020-02-17T03:00Z	2.683	false
2020-02-17T02:45Z	2.683	false
2020-02-17T02:30Z	2.683	false
2020-02-17T02:15Z	2.683	false
2020-02-17T02:00Z	2.683	false
2020-02-17T01:45Z	2.683	false
2020-02-17T01:30Z	2.683	false
2020-02-17T01:15Z	2.683	false
2020-02-17T01:00Z	2.683	false
2020-02-17T00:45Z	2.683	false
2020-02-17T00:30Z	2.683	false
2020-02-17T00:15Z	2.683	false
2020-02-17T00:00Z	2.683	false
2020-02-16T23:45Z	2.683	false
2020-02-16T23:30Z	2.683	false
2020-02-16T23:15Z	2.683	false
2020-02-16T23:00Z	2.683	false
2020-02-16T22:45Z	2.683	false
2020-02-16T22:30Z	2.683	false
2020-02-16T22:15Z	2.683	false
2020-02-16T22:00Z	2.683	false
2020-02-16T21:45Z	2.683	false
2020-02-16T21:30Z	2.683	false
2020-02-16T21:15Z	2.683	false
2020-02-16T21:00Z	2.683	false
2020-02-16T20:45Z	2.683	false
2020-02-16T20:30Z	2.683	false
2020-02-16T20:15Z	2.683	false
2020-02-16T20:00Z	2.683	false
2020-02-16T19:45Z	2.683	false
2020-02-16T19:30Z	2.683	false
2020-02-16T19:15Z	2.683	false
2020-02-16T19:00Z	2.683	false
2020-02-16T18:45Z	2.683	false
2020-02-16T18:30Z	2.683	false
2020-02-16T18:15Z	2.683	false
2020-02-16T18:00Z	2.683	false
2020-02-16T17:45Z	2.683	false
2020-02-16T17:30Z	2.683	false
2020-02-16T17:15Z	2.683	false
2020-02-16T17:00Z	2.683	false
2020-02-16T16:45Z	2.683	false
2020-02-16T16:30Z	2.683	false
2020-02-16T16:15Z	2.683	false
2020-02-16T16:00Z	2.683	false
2020-02-16T15:45Z	2.683	false
2020-02-16T15:30Z	2.683	false
2020-02-16T15:15Z	2.683	false
2020-02-16T15:00Z	2.683	false
2020-02-16T14:45Z	2.683	false
2020-02-16T14:30Z	2.683	false
2020-02-16T14:15Z	2.683	false
2020-02-16T14:00Z	2.683	false
2020-02-16T13:45Z	2.683	false
2020-02-16T13:30Z	2.683	false
2020-02-16T13:15Z	2.683	false
2020-02-16T13:00Z	2.683	false
2020-02-16T12:45Z	2.683	false
2020-02-16T12:30Z	2.683	false
2020-02-16T12:15Z	2.683	false
2020-02-16T12:00Z	2.683	false
2020-02-16T11:45Z	2.683	false
2020-02-16T11:30Z	2.683	false
2020-02-16T11:15Z	2.683	false
2020-02-16T11:00Z	2.683	false
2020-02-16T10:45Z	2.683	false
2020-02-16T10:30Z	2.683	false
2020-02-16T10:15Z	2.683	false
2020-02-16T10:00Z	2.683	false
2020-02-16T09:45Z	2.683	false
2020-02-16T09:30Z	2.683	false
2020-02-16T09:15Z	2.683	false
2020-02-16T09:00Z	2.683	false
2020-02-16T08:45Z	2.683	false
2020-02-16T08:30Z	2.683	false
2020-02-16T08:15Z	2.683	false
2020-02-16T08:00Z	2.683	false
2020-02-16T07:45Z	2.683	false
2020-02-16T07:30Z	2.683	false
2020-02-16T07:15Z	2.683	false
2020-02-16T07:00Z	2.683	false
2020-02-16T06:45Z	2.683	false
2020-02-16T06:30Z	2.683	false
2020-02-16T06:15Z	2.683	false
2020-02-16T06:00Z	2.683	false
2020-02-16T05:45Z	2.683	false
2020-02-16T05:30Z	2.683	false
2020-02-16T05:15Z	2.683	false
2020-02-16T05:00Z	2.683	false
2020-02-16T04:45Z	2.683	false
2020-02-16T04:30Z	2.683	false
2020-02-16T04:15Z	2.683	false
2020-02-16T04:00Z	2.683	false
2020-02-16T03:45Z	2.683	false
2020-02-16T03:30Z	2.683	false
2020-02-16T03:15Z	2.683	false
2020-02-16T03:00Z	2.683	false
2020-02-16T02:45Z	2.683	false
2020-02-16T02:30Z	2.683	false
2020-02-16T02:15Z	2.683	false
2020-02-16T02:00Z	2.683	false
2020-02-16T01:45Z	2.683	false
2020-02-16T01:30Z	2.683	false
2020-02-16T01:15Z	2.683	false
2020-02-16T01:00Z	2.683	false
2020-02-16T00:45Z	2.683	false
2020-02-16T00:30Z	2.683	false
2020-02-16T00:15Z	2.683	false
2020-02-16T00:00Z	2.683	false
2020-02-15T23:45Z	2.683	false
2020-02-15T23:30Z	2.683	false
2020-02-15T23:15Z	2.683	false
2020-02-15T23:00Z	2.683	false
2020-02-15T22:45Z	2.683	false
2020-02-15T22:30Z	2.683	false
2020-02-15T22:15Z	2.683	false
2020-02-15T22:00Z	2.683	false
2020-02-15T21:45Z	2.683	false
2020-02-15T21:30Z	2.683	false
2020-02-15T21:15Z	2.683	false
2020-02-15T21:00Z	2.683	false
2020-02-15T20:45Z	2.683	false
2020-02-15T20:30Z	2.683	false
2020-02-15T20:15Z	2.683	false
2020-02-15T20:00Z	2.683	false
2020-02-15T19:45Z	2.683	false
2020-02-15T19:30Z	2.683	false
2020-02-15T19:15Z	2.683	false
2020-02-15T19:00Z	2.683	false
2020-02-15T18:45Z	2.683	false
2020-02-15T18:30Z	2.683	false
2020-02-15T18:15Z	2.683	false
2020-02-15T18:00Z	2.683	false
2020-02-15T17:45Z	2.683	false
2020-02-15T17:30Z	2.683	false
2020-02-15T17:15Z	2.683	false
2020-02-15T17:00Z	2.683	false
2020-02-15T16:45Z	2.683	false
2020-02-15T16:30Z	2.683	false
2020-02-15T16:15Z	2.683	false
2020-02-15T16:00Z	2.683	false
2020-02-15T15:45Z	2.683	false
2020-02-15T15:30Z	2.683	false
2020-02-15T15:15Z	2.683	false
2020-02-15T15:00Z	2.683	false
2020-02-15T14:45Z	2.683	false
2020-02-15T14:30Z	2.683	false
2020-02-15T14:15Z	2.683	false
2020-02-15T14:00Z	2.683	false
2020-02-15T13:45Z	2.683	false
2020-02-15T13:30Z	2.683	false
2020-02-15T13:15Z	2.683	false
2020-02-15T13:00Z	2.683	false
2020-02-15T12:45Z	2.683	false
2020-02-15T12:30Z	2.683	false
2020-02-15T12:15Z	2.683	false
2020-02-15T12:00Z	2.683	false
2020-02-15T11:45Z	2.683	false
2020-02-15T11:30Z	2.683	false
2020-02-15T11:15Z	2.683	false
2020-02-15T11:00Z	2.683	false
2020-02-15T10:45Z	2.683	false
2020-02-15T10:30Z	2.683	false
2020-02-15T10:15Z	2.683	false
2020-02-15T10:00Z	2.683	false
2020-02-15T09:45Z	2.683	false
2020-02-15T09:30Z	2.683	false
2020-02-15T09:15Z	2.683	false
2020-02-15T09:00Z	2.683	false
2020-02-15T08:45Z	2.683	false
2020-02-15T08:30Z	2.683	false
2020-02-15T08:15Z	2.683	false
2020-02-15T08:00Z	2.683	false
2020-02-15T07:45Z	2.683	false
2020-02-15T07:30Z	2.683	false
2020-02-15T07:15Z	2.683	false
2020-02-15T07:00Z	2.683	false
2020-02-15T06:45Z	2.683	false
2020-02-15T06:30Z	2.683	false
2020-02-15T06:15Z	2.683	false
2020-02-15T06:00Z	2.683	false
2020-02-15T05:45Z	2.683	false
2020-02-15T05:30Z	2.683	false
2020-02-15T05:15Z	2.683	false
2020-02-15T05:00Z	2.683	false
2020-02-15T04:45Z	2.683	false
2020-02-15T04:30Z	2.683	false
2020-02-15T04:15Z	2.683	false
2020-02-15T04:00Z	2.683	false
2020-02-15T03:45Z	2.683	false
2020-02-15T03:30Z	2.683	false
2020-02-15T03:15Z	2.683	false
2020-02-15T03:00Z	2.683	false
2020-02-15T02:45Z	2.683	false
2020-02-15T02:30Z	2.683	false
2020-02-15T02:15Z	2.683	false
2020-02-15T02:00Z	2.683	false
2020-02-15T01:45Z	2.683	false
2020-02-15T01:30Z	2.683	false
2020-02-15T01:15Z	2.683	false
2020-02-15T01:00Z	2.683	false
2020-02-15T00:45Z	2.683	false
2020-02-15T00:30Z	2.683	false
2020-02-15T00:15Z	2.683	false
2020-02-15T00:00Z	2.683	false
2020-02-14T23:45Z	2.683	false
2020-02-14T23:30Z	2.683	false
2020-02-14T23:15Z	2.683	false
2020-02-14T23:00Z	2.683	false
2020-02-14T22:45Z	2.683	false
2020-02-14T22:30Z	2.683	false
2020-02-14T22:15Z	2.683	false
2020-02-14T22:00Z	2.683	false
2020-02-14T21:45Z	2.683	false
2020-02-14T21:30Z	2.683	false
2020-02-14T21:15Z	2.683	false
2020-02-14T21:00Z	2.683	false
2020-02-14T20:45Z	2.683	false
2020-02-14T20:30Z	2.683	false
2020-02-14T20:15Z	2.683	false
2020-02-14T20:00Z	2.683	false
2020-02-14T19:45Z	2.683	false
2020-02-14T19:30Z	2.683	false
2020-02-14T19:15Z	2.683	false
2020-02-14T19:00Z	2.683	false
2020-02-14T18:45Z	2.683	false
2020-02-14T18:30Z	2.683	false
2020-02-14T18:15Z	2.683	false
2020-02-14T18:00Z	2.683	false
2020-02-14T17:45Z	2.683	false
2020-02-14T17:30Z	2.683	false
2020-02-14T17:15Z	2.683	false
2020-02-14T17:00Z	2.683	false
2020-02-14T16:45Z	2.683	false
2020-02-14T16:30Z	2.683	false
2020-02-14T16:15Z	2.683	false
2020-02-14T16:00Z	2.683	false
2020-02-14T15:45Z	2.683	false
2020-02-14T15:30Z	2.683	false
2020-02-14T15:15Z	2.683	false
2020-02-14T15:00Z	2.683	false
2020-02-14T14:45Z	2.683	false
2020-02-14T14:30Z	2.683	false
2020-02-14T14:15Z	2.683	false
2020-02-14T14:00Z	2.683	false
2020-02-14T13:45Z	2.683	false
2020-02-14T13:30Z	2.683	false
2020-02-14T13:15Z	2.683	false
2020-02-14T13:00Z	2.683	false
2020-02-14T12:45Z	2.683	false
2020-02-14T12:30Z	2.683	false
2020-02-14T12:15Z	2.683	false
2020-02-14T12:00Z	2.683	false
2020-02-14T11:45Z	2.683	false
2020-02-14T11:30Z	2.683	false
2020-02-14T11:15Z	2.683	false
2020-02-14T11:00Z	2.683	false
2020-02-14T10:45Z	2.683	false
2020-02-14T10:30Z	2.683	false
2020-02-14T10:15Z	2.683	false
2020-02-14T10:00Z	2.683	false
2020-02-14T09:45Z	2.683	false
2020-02-14T09:30Z	2.683	false
2020-02-14T09:15Z	2.683	false
2020-02-14T09:00Z	2.683	false
2020-02-14T08:45Z	2.683	false
2020-02-14T08:30Z	2.683	false
2020-02-14T08:15Z	2.683	false
2020-02-14T08:00Z	2.704	false
2020-02-14T07:45Z	2.692	false
2020-02-14T07:30Z	2.684	false
2020-02-14T07:15Z	2.674	false
2020-02-14T07:00Z	2.706	false
2020-02-14T06:45Z	2.678	false
2020-02-14T06:30Z	2.704	false
2020-02-14T06:15Z	2.7	false
2020-02-14T06:00Z	2.717	false
2020-02-14T05:45Z	2.703	false
2020-02-14T05:30Z	2.712	false
2020-02-14T05:15Z	2.706	false
2020-02-14T05:00Z	2.69	false
2020-02-14T04:45Z	2.716	false
2020-02-14T04:30Z	2.691	false
2020-02-14T04:15Z	2.704	false
2020-02-14T04:00Z	2.687	false
2020-02-14T03:45Z	2.695	false
2020-02-14T03:30Z	2.687	false
2020-02-14T03:15Z	2.697	false
2020-02-14T03:00Z	2.691	false
2020-02-14T02:45Z	2.691	false
2020-02-14T02:30Z	2.698	false
2020-02-14T02:15Z	2.703	false
2020-02-14T02:00Z	2.706	false
2020-02-14T01:45Z	2.659	false
2020-02-14T01:30Z	2.699	false
2020-02-14T01:15Z	2.677	false
2020-02-14T01:00Z	2.694	false
2020-02-14T00:45Z	2.688	false
2020-02-14T00:30Z	2.669	false
2020-02-14T00:15Z	2.665	false
2020-02-14T00:00Z	2.671	false
2020-02-13T23:45Z	2.682	false
2020-02-13T23:30Z	2.66	false
2020-02-13T23:15Z	2.663	false
2020-02-13T23:00Z	2.671	false
2020-02-13T22:45Z	2.669	false
2020-02-13T22:30Z	2.674	false
2020-02-13T22:15Z	2.686	false
2020-02-13T22:00Z	2.685	false
2020-02-13T21:45Z	2.66	false
2020-02-13T21:30Z	2.639	false
2020-02-13T21:15Z	2.695	false
2020-02-13T21:00Z	2.683	false
2020-02-13T20:45Z	2.663	false
2020-02-13T20:30Z	2.657	false
2020-02-13T20:15Z	2.66	false
2020-02-13T20:00Z	2.676	false
2020-02-13T19:45Z	2.645	false
2020-02-13T19:30Z	2.688	false
2020-02-13T19:15Z	2.641	false
2020-02-13T19:00Z	2.665	false
2020-02-13T18:45Z	2.616	false
2020-02-13T18:30Z	2.663	false
2020-02-13T18:15Z	2.641	false
2020-02-13T18:00Z	2.627	false
2020-02-13T17:45Z	2.641	false
2020-02-13T17:30Z	2.668	false
2020-02-13T17:15Z	2.657	false
2020-02-13T17:00Z	2.643	false
2020-02-13T16:45Z	2.692	false
2020-02-13T16:30Z	2.662	false
2020-02-13T16:15Z	2.659	false
2020-02-13T16:00Z	2.675	false
2020-02-13T15:45Z	2.654	false
2020-02-13T15:30Z	2.675	false
2020-02-13T15:15Z	2.633	false
2020-02-13T15:00Z	2.668	false
2020-02-13T14:45Z	2.632	false
2020-02-13T14:30Z	2.64	false
2020-02-13T14:15Z	2.649	false
2020-02-13T14:00Z	2.637	false
2020-02-13T13:45Z	2.601	false
2020-02-13T13:30Z	2.645	false
2020-02-13T13:15Z	2.651	false
2020-02-13T13:00Z	2.648	false
2020-02-13T12:45Z	2.623	false
2020-02-13T12:30Z	2.66	false
2020-02-13T12:15Z	2.646	false
2020-02-13T12:00Z	2.637	false
2020-02-13T11:45Z	2.655	false
2020-02-13T11:30Z	2.644	false
2020-02-13T11:15Z	2.634	false
2020-02-13T11:00Z	2.615	false
2020-02-13T10:45Z	2.636	false
2020-02-13T10:30Z	2.635	false
2020-02-13T10:15Z	2.627	false
2020-02-13T10:00Z	2.664	false
2020-02-13T09:45Z	2.619	false
2020-02-13T09:30Z	2.631	false
2020-02-13T09:15Z	2.624	false
2020-02-13T09:00Z	2.652	false
2020-02-13T08:45Z	2.628	false
2020-02-13T08:30Z	2.644	false
2020-02-13T08:15Z	2.609	false
2020-02-13T08:00Z	2.613	false
2020-02-13T07:45Z	2.605	false
2020-02-13T07:30Z	2.644	false
2020-02-13T07:15Z	2.674	false
2020-02-13T07:00Z	2.633	false
2020-02-13T06:45Z	2.628	false
2020-02-13T06:30Z	2.622	false
2020-02-13T06:15Z	2.607	false
2020-02-13T06:00Z	2.588	false
2020-02-13T05:45Z	2.641	false
2020-02-13T05:30Z	2.624	false
2020-02-13T05:15Z	2.605	false
2020-02-13T05:00Z	2.623	false
2020-02-13T04:45Z	2.633	false
2020-02-13T04:30Z	2.628	false
2020-02-13T04:15Z	2.646	false
2020-02-13T04:00Z	2.661	false
2020-02-13T03:45Z	2.636	false
2020-02-13T03:30Z	2.614	false
2020-02-13T03:15Z	2.653	false
2020-02-13T03:00Z	2.6	false
2020-02-13T02:45Z	2.629	false
2020-02-13T02:30Z	2.648	false
2020-02-13T02:15Z	2.624	false
2020-02-13T02:00Z	2.645	false
2020-02-13T01:45Z	2.616	false
2020-02-13T01:30Z	2.623	false
2020-02-13T01:15Z	2.64	false
2020-02-13T01:00Z	2.632	false
2020-02-13T00:45Z	2.646	false
2020-02-13T00:30Z	2.63	false
2020-02-13T00:15Z	2.635	false
2020-02-13T00:00Z	2.667	false
2020-02-12T23:45Z	2.662	false
2020-02-12T23:30Z	2.657	false
2020-02-12T23:15Z	2.664	false
2020-02-12T23:00Z	2.652	false
2020-02-12T22:45Z	2.662	false
2020-02-12T22:30Z	2.628	false
2020-02-12T22:15Z	2.64	false
2020-02-12T22:00Z	2.644	false
2020-02-12T21:45Z	2.657	false
2020-02-12T21:30Z	2.667	false
2020-02-12T21:15Z	2.663	false
2020-02-12T21:00Z	2.659	false
2020-02-12T20:45Z	2.651	false
2020-02-12T20:30Z	2.646	false
2020-02-12T20:15Z	2.662	false
2020-02-12T20:00Z	2.644	false
2020-02-12T19:45Z	2.626	false
2020-02-12T19:30Z	2.622	false
2020-02-12T19:15Z	2.669	false
2020-02-12T19:00Z	2.648	false
2020-02-12T18:45Z	2.65	false
2020-02-12T18:30Z	2.63	false
2020-02-12T18:15Z	2.655	false
2020-02-12T18:00Z	2.646	false
2020-02-12T17:45Z	2.622	false
2020-02-12T17:30Z	2.645	false
2020-02-12T17:15Z	2.651	false
2020-02-12T17:00Z	2.646	false
2020-02-12T16:45Z	2.648	false
2020-02-12T16:30Z	2.633	false
2020-02-12T16:15Z	2.633	false
2020-02-12T16:00Z	2.661	false
2020-02-12T15:45Z	2.631	false
2020-02-12T15:30Z	2.649	false
2020-02-12T15:15Z	2.627	false
2020-02-12T15:00Z	2.62	false
2020-02-12T14:45Z	2.619	false
2020-02-12T14:30Z	2.617	false
2020-02-12T14:15Z	2.648	false
2020-02-12T14:00Z	2.627	false
2020-02-12T13:45Z	2.6	false
2020-02-12T13:30Z	2.612	false
2020-02-12T13:15Z	2.613	false
2020-02-12T13:00Z	2.58	false
2020-02-12T12:45Z	2.598	false

Forecast data

Key information

• Station name: Marsh Lock (downstream)
• Station ID: 7155
• River name: River Thames
• Typical range: 2.30m to 3.02m
• Highest level on record: 4.28m on 09 February 2014
• Site datum: 28.45mAOD (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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