River level River Thames at Marsh 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 0.60m at 3:45am Saturday 22 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 0.40m 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
2020-02-22T03:45Z	0.596	false
2020-02-22T03:30Z	0.591	false
2020-02-22T03:15Z	0.596	false
2020-02-22T03:00Z	0.6	false
2020-02-22T02:45Z	0.601	false
2020-02-22T02:30Z	0.598	false
2020-02-22T02:15Z	0.596	false
2020-02-22T02:00Z	0.604	false
2020-02-22T01:45Z	0.602	false
2020-02-22T01:30Z	0.607	false
2020-02-22T01:15Z	0.608	false
2020-02-22T01:00Z	0.602	false
2020-02-22T00:45Z	0.603	false
2020-02-22T00:30Z	0.609	false
2020-02-22T00:15Z	0.611	false
2020-02-22T00:00Z	0.6	false
2020-02-21T23:45Z	0.604	false
2020-02-21T23:30Z	0.598	false
2020-02-21T23:15Z	0.6	false
2020-02-21T23:00Z	0.609	false
2020-02-21T22:45Z	0.602	false
2020-02-21T22:30Z	0.603	false
2020-02-21T22:15Z	0.608	false
2020-02-21T22:00Z	0.605	false
2020-02-21T21:45Z	0.607	false
2020-02-21T21:30Z	0.609	false
2020-02-21T21:15Z	0.608	false
2020-02-21T21:00Z	0.61	false
2020-02-21T20:45Z	0.606	false
2020-02-21T20:30Z	0.607	false
2020-02-21T20:15Z	0.607	false
2020-02-21T20:00Z	0.609	false
2020-02-21T19:45Z	0.609	false
2020-02-21T19:30Z	0.608	false
2020-02-21T19:15Z	0.609	false
2020-02-21T19:00Z	0.61	false
2020-02-21T18:45Z	0.615	false
2020-02-21T18:30Z	0.612	false
2020-02-21T18:15Z	0.62	false
2020-02-21T18:00Z	0.614	false
2020-02-21T17:45Z	0.611	false
2020-02-21T17:30Z	0.619	false
2020-02-21T17:15Z	0.611	false
2020-02-21T17:00Z	0.616	false
2020-02-21T16:45Z	0.62	false
2020-02-21T16:30Z	0.616	false
2020-02-21T16:15Z	0.622	false
2020-02-21T16:00Z	0.617	false
2020-02-21T15:45Z	0.623	false
2020-02-21T15:30Z	0.624	false
2020-02-21T15:15Z	0.617	false
2020-02-21T15:00Z	0.623	false
2020-02-21T14:45Z	0.625	false
2020-02-21T14:30Z	0.617	false
2020-02-21T14:15Z	0.628	false
2020-02-21T14:00Z	0.623	false
2020-02-21T13:45Z	0.622	false
2020-02-21T13:30Z	0.622	false
2020-02-21T13:15Z	0.623	false
2020-02-21T13:00Z	0.625	false
2020-02-21T12:45Z	0.63	false
2020-02-21T12:30Z	0.623	false
2020-02-21T12:15Z	0.632	false
2020-02-21T12:00Z	0.628	false
2020-02-21T11:45Z	0.629	false
2020-02-21T11:30Z	0.64	false
2020-02-21T11:15Z	0.634	false
2020-02-21T11:00Z	0.638	false
2020-02-21T10:45Z	0.631	false
2020-02-21T10:30Z	0.628	false
2020-02-21T10:15Z	0.632	false
2020-02-21T10:00Z	0.635	false
2020-02-21T09:45Z	0.626	false
2020-02-21T09:30Z	0.636	false
2020-02-21T09:15Z	0.637	false
2020-02-21T09:00Z	0.63	false
2020-02-21T08:45Z	0.635	false
2020-02-21T08:30Z	0.633	false
2020-02-21T08:15Z	0.634	false
2020-02-21T08:00Z	0.642	false
2020-02-21T07:45Z	0.639	false
2020-02-21T07:30Z	0.641	false
2020-02-21T07:15Z	0.638	false
2020-02-21T07:00Z	0.639	false
2020-02-21T06:45Z	0.641	false
2020-02-21T06:30Z	0.641	false
2020-02-21T06:15Z	0.641	false
2020-02-21T06:00Z	0.64	false
2020-02-21T05:45Z	0.644	false
2020-02-21T05:30Z	0.641	false
2020-02-21T05:15Z	0.64	false
2020-02-21T05:00Z	0.647	false
2020-02-21T04:45Z	0.645	false
2020-02-21T04:30Z	0.643	false
2020-02-21T04:15Z	0.644	false
2020-02-21T04:00Z	0.646	false
2020-02-21T03:45Z	0.65	false
2020-02-21T03:30Z	0.646	false
2020-02-21T03:15Z	0.648	false
2020-02-21T03:00Z	0.652	false
2020-02-21T02:45Z	0.645	false
2020-02-21T02:30Z	0.646	false
2020-02-21T02:15Z	0.653	false
2020-02-21T02:00Z	0.649	false
2020-02-21T01:45Z	0.65	false
2020-02-21T01:30Z	0.65	false
2020-02-21T01:15Z	0.657	false
2020-02-21T01:00Z	0.658	false
2020-02-21T00:45Z	0.66	false
2020-02-21T00:30Z	0.655	false
2020-02-21T00:15Z	0.658	false
2020-02-21T00:00Z	0.661	false
2020-02-20T23:45Z	0.656	false
2020-02-20T23:30Z	0.659	false
2020-02-20T23:15Z	0.66	false
2020-02-20T23:00Z	0.659	false
2020-02-20T22:45Z	0.654	false
2020-02-20T22:30Z	0.66	false
2020-02-20T22:15Z	0.663	false
2020-02-20T22:00Z	0.658	false
2020-02-20T21:45Z	0.657	false
2020-02-20T21:30Z	0.66	false
2020-02-20T21:15Z	0.663	false
2020-02-20T21:00Z	0.661	false
2020-02-20T20:45Z	0.665	false
2020-02-20T20:30Z	0.668	false
2020-02-20T20:15Z	0.661	false
2020-02-20T20:00Z	0.66	false
2020-02-20T19:45Z	0.67	false
2020-02-20T19:30Z	0.663	false
2020-02-20T19:15Z	0.664	false
2020-02-20T19:00Z	0.667	false
2020-02-20T18:45Z	0.664	false
2020-02-20T18:30Z	0.668	false
2020-02-20T18:15Z	0.668	false
2020-02-20T18:00Z	0.668	false
2020-02-20T17:45Z	0.668	false
2020-02-20T17:30Z	0.675	false
2020-02-20T17:15Z	0.668	false
2020-02-20T17:00Z	0.671	false
2020-02-20T16:45Z	0.667	false
2020-02-20T16:30Z	0.669	false
2020-02-20T16:15Z	0.671	false
2020-02-20T16:00Z	0.671	false
2020-02-20T15:45Z	0.674	false
2020-02-20T15:30Z	0.675	false
2020-02-20T15:15Z	0.678	false
2020-02-20T15:00Z	0.67	false
2020-02-20T14:45Z	0.677	false
2020-02-20T14:30Z	0.679	false
2020-02-20T14:15Z	0.682	false
2020-02-20T14:00Z	0.676	false
2020-02-20T13:45Z	0.681	false
2020-02-20T13:30Z	0.68	false
2020-02-20T13:15Z	0.68	false
2020-02-20T13:00Z	0.681	false
2020-02-20T12:45Z	0.682	false
2020-02-20T12:30Z	0.686	false
2020-02-20T12:15Z	0.69	false
2020-02-20T12:00Z	0.682	false
2020-02-20T11:45Z	0.684	false
2020-02-20T11:30Z	0.686	false
2020-02-20T11:15Z	0.681	false
2020-02-20T11:00Z	0.689	false
2020-02-20T10:45Z	0.687	false
2020-02-20T10:30Z	0.687	false
2020-02-20T10:15Z	0.685	false
2020-02-20T10:00Z	0.692	false
2020-02-20T09:45Z	0.688	false
2020-02-20T09:30Z	0.692	false
2020-02-20T09:15Z	0.69	false
2020-02-20T09:00Z	0.694	false
2020-02-20T08:45Z	0.697	false
2020-02-20T08:30Z	0.688	false
2020-02-20T08:15Z	0.69	false
2020-02-20T08:00Z	0.696	false
2020-02-20T07:45Z	0.702	false
2020-02-20T07:30Z	0.687	false
2020-02-20T07:15Z	0.692	false
2020-02-20T07:00Z	0.702	false
2020-02-20T06:45Z	0.697	false
2020-02-20T06:30Z	0.696	false
2020-02-20T06:15Z	0.695	false
2020-02-20T06:00Z	0.698	false
2020-02-20T05:45Z	0.703	false
2020-02-20T05:30Z	0.703	false
2020-02-20T05:15Z	0.701	false
2020-02-20T05:00Z	0.705	false
2020-02-20T04:45Z	0.71	false
2020-02-20T04:30Z	0.706	false
2020-02-20T04:15Z	0.711	false
2020-02-20T04:00Z	0.705	false
2020-02-20T03:45Z	0.712	false
2020-02-20T03:30Z	0.708	false
2020-02-20T03:15Z	0.707	false
2020-02-20T03:00Z	0.706	false
2020-02-20T02:45Z	0.708	false
2020-02-20T02:30Z	0.717	false
2020-02-20T02:15Z	0.709	false
2020-02-20T02:00Z	0.708	false
2020-02-20T01:45Z	0.704	false
2020-02-20T01:30Z	0.708	false
2020-02-20T01:15Z	0.713	false
2020-02-20T01:00Z	0.711	false
2020-02-20T00:45Z	0.706	false
2020-02-20T00:30Z	0.711	false
2020-02-20T00:15Z	0.714	false
2020-02-20T00:00Z	0.711	false
2020-02-19T23:45Z	0.709	false
2020-02-19T23:30Z	0.708	false
2020-02-19T23:15Z	0.714	false
2020-02-19T23:00Z	0.716	false
2020-02-19T22:45Z	0.714	false
2020-02-19T22:30Z	0.714	false
2020-02-19T22:15Z	0.712	false
2020-02-19T22:00Z	0.714	false
2020-02-19T21:45Z	0.708	false
2020-02-19T21:30Z	0.714	false
2020-02-19T21:15Z	0.716	false
2020-02-19T21:00Z	0.715	false
2020-02-19T20:45Z	0.716	false
2020-02-19T20:30Z	0.722	false
2020-02-19T20:15Z	0.723	false
2020-02-19T20:00Z	0.719	false
2020-02-19T19:45Z	0.72	false
2020-02-19T19:30Z	0.719	false
2020-02-19T19:15Z	0.722	false
2020-02-19T19:00Z	0.716	false
2020-02-19T18:45Z	0.72	false
2020-02-19T18:30Z	0.726	false
2020-02-19T18:15Z	0.718	false
2020-02-19T18:00Z	0.727	false
2020-02-19T17:45Z	0.721	false
2020-02-19T17:30Z	0.72	false
2020-02-19T17:15Z	0.719	false
2020-02-19T17:00Z	0.726	false
2020-02-19T16:45Z	0.728	false
2020-02-19T16:30Z	0.727	false
2020-02-19T16:15Z	0.726	false
2020-02-19T16:00Z	0.724	false
2020-02-19T15:45Z	0.725	false
2020-02-19T15:30Z	0.719	false
2020-02-19T15:15Z	0.726	false
2020-02-19T15:00Z	0.729	false
2020-02-19T14:45Z	0.725	false
2020-02-19T14:30Z	0.72	false
2020-02-19T14:15Z	0.721	false
2020-02-19T14:00Z	0.727	false
2020-02-19T13:45Z	0.726	false
2020-02-19T13:30Z	0.722	false
2020-02-19T13:15Z	0.724	false
2020-02-19T13:00Z	0.727	false
2020-02-19T12:45Z	0.724	false
2020-02-19T12:30Z	0.726	false
2020-02-19T12:15Z	0.727	false
2020-02-19T12:00Z	0.724	false
2020-02-19T11:45Z	0.725	false
2020-02-19T11:30Z	0.723	false
2020-02-19T11:15Z	0.725	false
2020-02-19T11:00Z	0.724	false
2020-02-19T10:45Z	0.723	false
2020-02-19T10:30Z	0.727	false
2020-02-19T10:15Z	0.726	false
2020-02-19T10:00Z	0.726	false
2020-02-19T09:45Z	0.722	false
2020-02-19T09:30Z	0.726	false
2020-02-19T09:15Z	0.727	false
2020-02-19T09:00Z	0.729	false
2020-02-19T08:45Z	0.727	false
2020-02-19T08:30Z	0.726	false
2020-02-19T08:15Z	0.726	false
2020-02-19T08:00Z	0.727	false
2020-02-19T07:45Z	0.726	false
2020-02-19T07:30Z	0.721	false
2020-02-19T07:15Z	0.724	false
2020-02-19T07:00Z	0.727	false
2020-02-19T06:45Z	0.729	false
2020-02-19T06:30Z	0.73	false
2020-02-19T06:15Z	0.728	false
2020-02-19T06:00Z	0.731	false
2020-02-19T05:45Z	0.732	false
2020-02-19T05:30Z	0.733	false
2020-02-19T05:15Z	0.73	false
2020-02-19T05:00Z	0.732	false
2020-02-19T04:45Z	0.729	false
2020-02-19T04:30Z	0.73	false
2020-02-19T04:15Z	0.735	false
2020-02-19T04:00Z	0.726	false
2020-02-19T03:45Z	0.728	false
2020-02-19T03:30Z	0.733	false
2020-02-19T03:15Z	0.735	false
2020-02-19T03:00Z	0.734	false
2020-02-19T02:45Z	0.738	false
2020-02-19T02:30Z	0.733	false
2020-02-19T02:15Z	0.734	false
2020-02-19T02:00Z	0.737	false
2020-02-19T01:45Z	0.729	false
2020-02-19T01:30Z	0.733	false
2020-02-19T01:15Z	0.737	false
2020-02-19T01:00Z	0.738	false
2020-02-19T00:45Z	0.736	false
2020-02-19T00:30Z	0.74	false
2020-02-19T00:15Z	0.743	false
2020-02-19T00:00Z	0.739	false
2020-02-18T23:45Z	0.737	false
2020-02-18T23:30Z	0.74	false
2020-02-18T23:15Z	0.741	false
2020-02-18T23:00Z	0.746	false
2020-02-18T22:45Z	0.74	false
2020-02-18T22:30Z	0.742	false
2020-02-18T22:15Z	0.741	false
2020-02-18T22:00Z	0.743	false
2020-02-18T21:45Z	0.744	false
2020-02-18T21:30Z	0.743	false
2020-02-18T21:15Z	0.744	false
2020-02-18T21:00Z	0.742	false
2020-02-18T20:45Z	0.742	false
2020-02-18T20:30Z	0.75	false
2020-02-18T20:15Z	0.743	false
2020-02-18T20:00Z	0.745	false
2020-02-18T19:45Z	0.745	false
2020-02-18T19:30Z	0.747	false
2020-02-18T19:15Z	0.748	false
2020-02-18T19:00Z	0.75	false
2020-02-18T18:45Z	0.749	false
2020-02-18T18:30Z	0.745	false
2020-02-18T18:15Z	0.751	false
2020-02-18T18:00Z	0.748	false
2020-02-18T17:45Z	0.747	false
2020-02-18T17:30Z	0.752	false
2020-02-18T17:15Z	0.75	false
2020-02-18T17:00Z	0.748	false
2020-02-18T16:45Z	0.749	false
2020-02-18T16:30Z	0.754	false
2020-02-18T16:15Z	0.753	false
2020-02-18T16:00Z	0.751	false
2020-02-18T15:45Z	0.753	false
2020-02-18T15:30Z	0.746	false
2020-02-18T15:15Z	0.752	false
2020-02-18T15:00Z	0.744	false
2020-02-18T14:45Z	0.749	false
2020-02-18T14:30Z	0.752	false
2020-02-18T14:15Z	0.746	false
2020-02-18T14:00Z	0.756	false
2020-02-18T13:45Z	0.746	false
2020-02-18T13:30Z	0.742	false
2020-02-18T13:15Z	0.744	false
2020-02-18T13:00Z	0.747	false
2020-02-18T12:45Z	0.749	false
2020-02-18T12:30Z	0.746	false
2020-02-18T12:15Z	0.748	false
2020-02-18T12:00Z	0.737	false
2020-02-18T11:45Z	0.741	false
2020-02-18T11:30Z	0.739	false
2020-02-18T11:15Z	0.735	false
2020-02-18T11:00Z	0.726	false
2020-02-18T10:45Z	0.725	false
2020-02-18T10:30Z	0.716	false
2020-02-18T10:15Z	0.719	false
2020-02-18T10:00Z	0.715	false
2020-02-18T09:45Z	0.713	false
2020-02-18T09:30Z	0.715	false
2020-02-18T09:15Z	0.719	false
2020-02-18T09:00Z	0.714	false
2020-02-18T08:45Z	0.711	false
2020-02-18T08:30Z	0.715	false
2020-02-18T08:15Z	0.708	false
2020-02-18T08:00Z	0.706	false
2020-02-18T07:45Z	0.702	false
2020-02-18T07:30Z	0.7	false
2020-02-18T07:15Z	0.699	false
2020-02-18T07:00Z	0.689	false
2020-02-18T06:45Z	0.69	false
2020-02-18T06:30Z	0.682	false
2020-02-18T06:15Z	0.681	false
2020-02-18T06:00Z	0.685	false
2020-02-18T05:45Z	0.672	false
2020-02-18T05:30Z	0.67	false
2020-02-18T05:15Z	0.672	false
2020-02-18T05:00Z	0.669	false
2020-02-18T04:45Z	0.662	false
2020-02-18T04:30Z	0.661	false
2020-02-18T04:15Z	0.656	false
2020-02-18T04:00Z	0.655	false
2020-02-18T03:45Z	0.646	false
2020-02-18T03:30Z	0.645	false
2020-02-18T03:15Z	0.64	false
2020-02-18T03:00Z	0.635	false
2020-02-18T02:45Z	0.627	false
2020-02-18T02:30Z	0.623	false
2020-02-18T02:15Z	0.624	false
2020-02-18T02:00Z	0.623	false
2020-02-18T01:45Z	0.621	false
2020-02-18T01:30Z	0.613	false
2020-02-18T01:15Z	0.615	false
2020-02-18T01:00Z	0.606	false
2020-02-18T00:45Z	0.607	false
2020-02-18T00:30Z	0.598	false
2020-02-18T00:15Z	0.597	false
2020-02-18T00:00Z	0.59	false
2020-02-17T23:45Z	0.593	false
2020-02-17T23:30Z	0.597	false
2020-02-17T23:15Z	0.589	false
2020-02-17T23:00Z	0.587	false
2020-02-17T22:45Z	0.581	false
2020-02-17T22:30Z	0.574	false
2020-02-17T22:15Z	0.574	false
2020-02-17T22:00Z	0.571	false
2020-02-17T21:45Z	0.572	false
2020-02-17T21:30Z	0.567	false
2020-02-17T21:15Z	0.565	false
2020-02-17T21:00Z	0.561	false
2020-02-17T20:45Z	0.562	false
2020-02-17T20:30Z	0.549	false
2020-02-17T20:15Z	0.552	false
2020-02-17T20:00Z	0.545	false
2020-02-17T19:45Z	0.548	false
2020-02-17T19:30Z	0.548	false
2020-02-17T19:15Z	0.538	false
2020-02-17T19:00Z	0.538	false
2020-02-17T18:45Z	0.533	false
2020-02-17T18:30Z	0.531	false
2020-02-17T18:15Z	0.529	false
2020-02-17T18:00Z	0.52	false
2020-02-17T17:45Z	0.521	false
2020-02-17T17:30Z	0.519	false
2020-02-17T17:15Z	0.517	false
2020-02-17T17:00Z	0.505	false
2020-02-17T16:45Z	0.503	false
2020-02-17T16:30Z	0.5	false
2020-02-17T16:15Z	0.495	false
2020-02-17T16:00Z	0.495	false
2020-02-17T15:45Z	0.49	false
2020-02-17T15:30Z	0.485	false
2020-02-17T15:15Z	0.478	false
2020-02-17T15:00Z	0.474	false
2020-02-17T14:45Z	0.472	false
2020-02-17T14:30Z	0.465	false
2020-02-17T14:15Z	0.467	false
2020-02-17T14:00Z	0.462	false
2020-02-17T13:45Z	0.46	false
2020-02-17T13:30Z	0.458	false
2020-02-17T13:15Z	0.457	false
2020-02-17T13:00Z	0.45	false
2020-02-17T12:45Z	0.441	false
2020-02-17T12:30Z	0.439	false
2020-02-17T12:15Z	0.439	false
2020-02-17T12:00Z	0.429	false
2020-02-17T11:45Z	0.434	false
2020-02-17T11:30Z	0.428	false
2020-02-17T11:15Z	0.425	false
2020-02-17T11:00Z	0.429	false
2020-02-17T10:45Z	0.422	false
2020-02-17T10:30Z	0.422	false
2020-02-17T10:15Z	0.421	false
2020-02-17T10:00Z	0.413	false
2020-02-17T09:45Z	0.413	false
2020-02-17T09:30Z	0.414	false
2020-02-17T09:15Z	0.416	false
2020-02-17T09:00Z	0.422	false
2020-02-17T08:45Z	0.408	false
2020-02-17T08:30Z	0.419	false
2020-02-17T08:15Z	0.409	false
2020-02-17T08:00Z	0.402	false
2020-02-17T07:45Z	0.405	false
2020-02-17T07:30Z	0.398	false
2020-02-17T07:15Z	0.399	false
2020-02-17T07:00Z	0.4	false
2020-02-17T06:45Z	0.393	false
2020-02-17T06:30Z	0.396	false
2020-02-17T06:15Z	0.393	false
2020-02-17T06:00Z	0.39	false
2020-02-17T05:45Z	0.387	false
2020-02-17T05:30Z	0.388	false
2020-02-17T05:15Z	0.383	false
2020-02-17T05:00Z	0.38	false
2020-02-17T04:45Z	0.377	false
2020-02-17T04:30Z	0.374	false
2020-02-17T04:15Z	0.373	false
2020-02-17T04:00Z	0.378	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
• View your property's long term risk of flooding

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