River level River Thames at Old Windsor 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 0.68m at 2:00pm Monday 20 January 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
▼

• Measured level
• When the water level reaches 0.35m here, minor flooding is possible in this area
• Highest recorded level. Hide
• Show highest recorded level

You're missing out. A graph should be visible here.
Upgrade your browser to see and use all the features of this service.

You're missing out. A graph should be visible here.

Javascript must be enabled.

Observed data

DateTime	Value	Error
2020-01-20T14:00Z	0.677	false
2020-01-20T13:45Z	0.685	false
2020-01-20T13:30Z	0.689	false
2020-01-20T13:15Z	0.687	false
2020-01-20T13:00Z	0.69	false
2020-01-20T12:45Z	0.692	false
2020-01-20T12:30Z	0.694	false
2020-01-20T12:15Z	0.701	false
2020-01-20T12:00Z	0.688	false
2020-01-20T12:00Z	0.688	false
2020-01-20T11:45Z	0.705	false
2020-01-20T11:45Z	0.705	false
2020-01-20T11:30Z	0.699	false
2020-01-20T11:30Z	0.699	false
2020-01-20T11:15Z	0.708	false
2020-01-20T11:15Z	0.708	false
2020-01-20T11:00Z	0.696	false
2020-01-20T10:45Z	0.705	false
2020-01-20T10:30Z	0.712	false
2020-01-20T10:15Z	0.711	false
2020-01-20T10:00Z	0.72	false
2020-01-20T09:45Z	0.712	false
2020-01-20T09:30Z	0.714	false
2020-01-20T09:15Z	0.717	false
2020-01-20T09:00Z	0.711	false
2020-01-20T08:45Z	0.719	false
2020-01-20T08:30Z	0.717	false
2020-01-20T08:15Z	0.72	false
2020-01-20T08:00Z	0.738	false
2020-01-20T07:45Z	0.728	false
2020-01-20T07:30Z	0.719	false
2020-01-20T07:15Z	0.729	false
2020-01-20T07:00Z	0.727	false
2020-01-20T06:45Z	0.731	false
2020-01-20T06:30Z	0.734	false
2020-01-20T06:15Z	0.726	false
2020-01-20T06:00Z	0.731	false
2020-01-20T05:45Z	0.746	false
2020-01-20T05:30Z	0.733	false
2020-01-20T05:15Z	0.729	false
2020-01-20T05:00Z	0.734	false
2020-01-20T04:45Z	0.732	false
2020-01-20T04:30Z	0.734	false
2020-01-20T04:15Z	0.73	false
2020-01-20T04:00Z	0.735	false
2020-01-20T03:45Z	0.733	false
2020-01-20T03:30Z	0.737	false
2020-01-20T03:15Z	0.737	false
2020-01-20T03:00Z	0.741	false
2020-01-20T02:45Z	0.738	false
2020-01-20T02:30Z	0.738	false
2020-01-20T02:15Z	0.743	false
2020-01-20T02:00Z	0.742	false
2020-01-20T01:45Z	0.736	false
2020-01-20T01:30Z	0.749	false
2020-01-20T01:15Z	0.763	false
2020-01-20T01:00Z	0.757	false
2020-01-20T00:45Z	0.775	false
2020-01-20T00:30Z	0.784	false
2020-01-20T00:15Z	0.779	false
2020-01-20T00:00Z	0.783	false
2020-01-19T23:45Z	0.787	false
2020-01-19T23:30Z	0.792	false
2020-01-19T23:15Z	0.784	false
2020-01-19T23:00Z	0.797	false
2020-01-19T22:45Z	0.784	false
2020-01-19T22:30Z	0.791	false
2020-01-19T22:15Z	0.789	false
2020-01-19T22:00Z	0.797	false
2020-01-19T21:45Z	0.793	false
2020-01-19T21:30Z	0.803	false
2020-01-19T21:15Z	0.797	false
2020-01-19T21:00Z	0.815	false
2020-01-19T20:45Z	0.796	false
2020-01-19T20:30Z	0.813	false
2020-01-19T20:15Z	0.806	false
2020-01-19T20:00Z	0.802	false
2020-01-19T19:45Z	0.81	false
2020-01-19T19:30Z	0.806	false
2020-01-19T19:15Z	0.808	false
2020-01-19T19:00Z	0.805	false
2020-01-19T18:45Z	0.814	false
2020-01-19T18:30Z	0.817	false
2020-01-19T18:15Z	0.809	false
2020-01-19T18:00Z	0.808	false
2020-01-19T17:45Z	0.818	false
2020-01-19T17:30Z	0.817	false
2020-01-19T17:15Z	0.819	false
2020-01-19T17:00Z	0.818	false
2020-01-19T16:45Z	0.826	false
2020-01-19T16:30Z	0.822	false
2020-01-19T16:15Z	0.834	false
2020-01-19T16:00Z	0.819	false
2020-01-19T15:45Z	0.828	false
2020-01-19T15:30Z	0.83	false
2020-01-19T15:15Z	0.828	false
2020-01-19T15:00Z	0.832	false
2020-01-19T14:45Z	0.83	false
2020-01-19T14:30Z	0.834	false
2020-01-19T14:15Z	0.835	false
2020-01-19T14:00Z	0.836	false
2020-01-19T13:45Z	0.83	false
2020-01-19T13:30Z	0.836	false
2020-01-19T13:15Z	0.829	false
2020-01-19T13:00Z	0.826	false
2020-01-19T12:45Z	0.809	false
2020-01-19T12:30Z	0.804	false
2020-01-19T12:15Z	0.799	false
2020-01-19T12:00Z	0.812	false
2020-01-19T11:45Z	0.814	false
2020-01-19T11:30Z	0.804	false
2020-01-19T11:15Z	0.802	false
2020-01-19T11:00Z	0.807	false
2020-01-19T10:45Z	0.807	false
2020-01-19T10:30Z	0.81	false
2020-01-19T10:15Z	0.809	false
2020-01-19T10:00Z	0.805	false
2020-01-19T09:45Z	0.799	false
2020-01-19T09:30Z	0.802	false
2020-01-19T09:15Z	0.811	false
2020-01-19T09:00Z	0.807	false
2020-01-19T08:45Z	0.808	false
2020-01-19T08:30Z	0.805	false
2020-01-19T08:15Z	0.814	false
2020-01-19T08:00Z	0.806	false
2020-01-19T07:45Z	0.809	false
2020-01-19T07:30Z	0.805	false
2020-01-19T07:15Z	0.81	false
2020-01-19T07:00Z	0.806	false
2020-01-19T06:45Z	0.798	false
2020-01-19T06:30Z	0.811	false
2020-01-19T06:15Z	0.803	false
2020-01-19T06:00Z	0.811	false
2020-01-19T05:45Z	0.803	false
2020-01-19T05:30Z	0.807	false
2020-01-19T05:15Z	0.815	false
2020-01-19T05:00Z	0.817	false
2020-01-19T04:45Z	0.807	false
2020-01-19T04:30Z	0.801	false
2020-01-19T04:15Z	0.799	false
2020-01-19T04:00Z	0.805	false
2020-01-19T03:45Z	0.803	false
2020-01-19T03:30Z	0.804	false
2020-01-19T03:15Z	0.812	false
2020-01-19T03:00Z	0.815	false
2020-01-19T03:00Z	0.815	false
2020-01-19T02:45Z	0.801	false
2020-01-19T02:45Z	0.801	false
2020-01-19T02:30Z	0.801	false
2020-01-19T02:30Z	0.801	false
2020-01-19T02:15Z	0.8	false
2020-01-19T02:15Z	0.8	false
2020-01-19T02:00Z	0.808	false
2020-01-19T01:45Z	0.811	false
2020-01-19T01:30Z	0.801	false
2020-01-19T01:15Z	0.798	false
2020-01-19T01:00Z	0.806	false
2020-01-19T00:45Z	0.797	false
2020-01-19T00:30Z	0.807	false
2020-01-19T00:15Z	0.796	false
2020-01-19T00:00Z	0.809	false
2020-01-18T23:45Z	0.799	false
2020-01-18T23:30Z	0.798	false
2020-01-18T23:15Z	0.798	false
2020-01-18T23:00Z	0.798	false
2020-01-18T22:45Z	0.793	false
2020-01-18T22:30Z	0.801	false
2020-01-18T22:15Z	0.796	false
2020-01-18T22:00Z	0.794	false
2020-01-18T21:45Z	0.793	false
2020-01-18T21:30Z	0.796	false
2020-01-18T21:15Z	0.796	false
2020-01-18T21:00Z	0.799	false
2020-01-18T20:45Z	0.794	false
2020-01-18T20:30Z	0.797	false
2020-01-18T20:15Z	0.799	false
2020-01-18T20:00Z	0.798	false
2020-01-18T19:45Z	0.799	false
2020-01-18T19:30Z	0.789	false
2020-01-18T19:15Z	0.786	false
2020-01-18T19:00Z	0.803	false
2020-01-18T18:45Z	0.791	false
2020-01-18T18:30Z	0.795	false
2020-01-18T18:15Z	0.786	false
2020-01-18T18:00Z	0.789	false
2020-01-18T17:45Z	0.785	false
2020-01-18T17:30Z	0.785	false
2020-01-18T17:15Z	0.799	false
2020-01-18T17:00Z	0.79	false
2020-01-18T16:45Z	0.793	false
2020-01-18T16:30Z	0.788	false
2020-01-18T16:15Z	0.791	false
2020-01-18T16:00Z	0.785	false
2020-01-18T15:45Z	0.783	false
2020-01-18T15:30Z	0.788	false
2020-01-18T15:15Z	0.789	false
2020-01-18T15:00Z	0.793	false
2020-01-18T14:45Z	0.796	false
2020-01-18T14:30Z	0.779	false
2020-01-18T14:15Z	0.788	false
2020-01-18T14:00Z	0.786	false
2020-01-18T13:45Z	0.789	false
2020-01-18T13:30Z	0.778	false
2020-01-18T13:15Z	0.784	false
2020-01-18T13:00Z	0.785	false
2020-01-18T12:45Z	0.783	false
2020-01-18T12:30Z	0.783	false
2020-01-18T12:15Z	0.794	false
2020-01-18T12:00Z	0.779	false
2020-01-18T11:45Z	0.781	false
2020-01-18T11:30Z	0.783	false
2020-01-18T11:15Z	0.783	false
2020-01-18T11:00Z	0.784	false
2020-01-18T10:45Z	0.777	false
2020-01-18T10:30Z	0.778	false
2020-01-18T10:15Z	0.786	false
2020-01-18T10:00Z	0.787	false
2020-01-18T09:45Z	0.786	false
2020-01-18T09:30Z	0.786	false
2020-01-18T09:15Z	0.794	false
2020-01-18T09:00Z	0.784	false
2020-01-18T08:45Z	0.787	false
2020-01-18T08:30Z	0.778	false
2020-01-18T08:15Z	0.781	false
2020-01-18T08:00Z	0.782	false
2020-01-18T07:45Z	0.783	false
2020-01-18T07:30Z	0.777	false
2020-01-18T07:15Z	0.782	false
2020-01-18T07:00Z	0.786	false
2020-01-18T06:45Z	0.776	false
2020-01-18T06:30Z	0.779	false
2020-01-18T06:15Z	0.786	false
2020-01-18T06:00Z	0.783	false
2020-01-18T05:45Z	0.782	false
2020-01-18T05:30Z	0.78	false
2020-01-18T05:15Z	0.781	false
2020-01-18T05:00Z	0.781	false
2020-01-18T04:45Z	0.776	false
2020-01-18T04:30Z	0.782	false
2020-01-18T04:15Z	0.791	false
2020-01-18T04:00Z	0.785	false
2020-01-18T03:45Z	0.791	false
2020-01-18T03:30Z	0.794	false
2020-01-18T03:15Z	0.78	false
2020-01-18T03:00Z	0.778	false
2020-01-18T02:45Z	0.785	false
2020-01-18T02:30Z	0.788	false
2020-01-18T02:15Z	0.791	false
2020-01-18T02:00Z	0.782	false
2020-01-18T01:45Z	0.782	false
2020-01-18T01:30Z	0.788	false
2020-01-18T01:15Z	0.778	false
2020-01-18T01:00Z	0.784	false
2020-01-18T00:45Z	0.778	false
2020-01-18T00:30Z	0.77	false
2020-01-18T00:15Z	0.778	false
2020-01-18T00:00Z	0.781	false
2020-01-17T23:45Z	0.784	false
2020-01-17T23:30Z	0.783	false
2020-01-17T23:15Z	0.771	false
2020-01-17T23:00Z	0.786	false
2020-01-17T22:45Z	0.787	false
2020-01-17T22:30Z	0.774	false
2020-01-17T22:15Z	0.789	false
2020-01-17T22:00Z	0.778	false
2020-01-17T21:45Z	0.787	false
2020-01-17T21:30Z	0.783	false
2020-01-17T21:15Z	0.789	false
2020-01-17T21:00Z	0.793	false
2020-01-17T20:45Z	0.783	false
2020-01-17T20:30Z	0.791	false
2020-01-17T20:15Z	0.789	false
2020-01-17T20:00Z	0.776	false
2020-01-17T19:45Z	0.784	false
2020-01-17T19:30Z	0.767	false
2020-01-17T19:15Z	0.777	false
2020-01-17T19:00Z	0.758	false
2020-01-17T18:45Z	0.757	false
2020-01-17T18:30Z	0.761	false
2020-01-17T18:15Z	0.739	false
2020-01-17T18:00Z	0.756	false
2020-01-17T17:45Z	0.735	false
2020-01-17T17:30Z	0.736	false
2020-01-17T17:15Z	0.749	false
2020-01-17T17:00Z	0.738	false
2020-01-17T16:45Z	0.738	false
2020-01-17T16:30Z	0.738	false
2020-01-17T16:15Z	0.739	false
2020-01-17T16:00Z	0.749	false
2020-01-17T15:45Z	0.75	false
2020-01-17T15:30Z	0.742	false
2020-01-17T15:15Z	0.754	false
2020-01-17T15:00Z	0.741	false
2020-01-17T14:45Z	0.733	false
2020-01-17T14:30Z	0.717	false
2020-01-17T14:15Z	0.72	false
2020-01-17T14:00Z	0.715	false
2020-01-17T13:45Z	0.713	false
2020-01-17T13:30Z	0.697	false
2020-01-17T13:15Z	0.7	false
2020-01-17T13:00Z	0.695	false
2020-01-17T12:45Z	0.698	false
2020-01-17T12:30Z	0.704	false
2020-01-17T12:15Z	0.693	false
2020-01-17T12:00Z	0.705	false
2020-01-17T11:45Z	0.691	false
2020-01-17T11:30Z	0.698	false
2020-01-17T11:15Z	0.683	false
2020-01-17T11:00Z	0.694	false
2020-01-17T10:45Z	0.691	false
2020-01-17T10:30Z	0.692	false
2020-01-17T10:15Z	0.699	false
2020-01-17T10:00Z	0.686	false
2020-01-17T09:45Z	0.682	false
2020-01-17T09:30Z	0.681	false
2020-01-17T09:15Z	0.679	false
2020-01-17T09:00Z	0.668	false
2020-01-17T08:45Z	0.657	false
2020-01-17T08:30Z	0.647	false
2020-01-17T08:15Z	0.637	false
2020-01-17T08:00Z	0.643	false
2020-01-17T07:45Z	0.639	false
2020-01-17T07:30Z	0.63	false
2020-01-17T07:15Z	0.636	false
2020-01-17T07:00Z	0.641	false
2020-01-17T06:45Z	0.63	false
2020-01-17T06:30Z	0.627	false
2020-01-17T06:15Z	0.623	false
2020-01-17T06:00Z	0.618	false
2020-01-17T05:45Z	0.618	false
2020-01-17T05:30Z	0.614	false
2020-01-17T05:15Z	0.601	false
2020-01-17T05:00Z	0.594	false
2020-01-17T04:45Z	0.606	false
2020-01-17T04:30Z	0.602	false
2020-01-17T04:15Z	0.59	false
2020-01-17T04:00Z	0.588	false
2020-01-17T03:45Z	0.584	false
2020-01-17T03:30Z	0.587	false
2020-01-17T03:15Z	0.592	false
2020-01-17T03:00Z	0.588	false
2020-01-17T02:45Z	0.59	false
2020-01-17T02:30Z	0.58	false
2020-01-17T02:15Z	0.581	false
2020-01-17T02:00Z	0.57	false
2020-01-17T01:45Z	0.562	false
2020-01-17T01:30Z	0.568	false
2020-01-17T01:15Z	0.565	false
2020-01-17T01:00Z	0.569	false
2020-01-17T00:45Z	0.559	false
2020-01-17T00:30Z	0.572	false
2020-01-17T00:15Z	0.557	false
2020-01-17T00:00Z	0.564	false
2020-01-16T23:45Z	0.554	false
2020-01-16T23:30Z	0.564	false
2020-01-16T23:15Z	0.561	false
2020-01-16T23:00Z	0.55	false
2020-01-16T22:45Z	0.551	false
2020-01-16T22:30Z	0.555	false
2020-01-16T22:15Z	0.547	false
2020-01-16T22:00Z	0.547	false
2020-01-16T21:45Z	0.552	false
2020-01-16T21:30Z	0.539	false
2020-01-16T21:15Z	0.56	false
2020-01-16T21:00Z	0.555	false
2020-01-16T20:45Z	0.54	false
2020-01-16T20:30Z	0.544	false
2020-01-16T20:15Z	0.55	false
2020-01-16T20:00Z	0.539	false
2020-01-16T19:45Z	0.538	false
2020-01-16T19:30Z	0.546	false
2020-01-16T19:15Z	0.537	false
2020-01-16T19:00Z	0.525	false
2020-01-16T18:45Z	0.533	false
2020-01-16T18:30Z	0.518	false
2020-01-16T18:15Z	0.527	false
2020-01-16T18:00Z	0.513	false
2020-01-16T17:45Z	0.518	false
2020-01-16T17:30Z	0.512	false
2020-01-16T17:15Z	0.495	false
2020-01-16T17:00Z	0.512	false
2020-01-16T16:45Z	0.512	false
2020-01-16T16:30Z	0.506	false
2020-01-16T16:15Z	0.495	false
2020-01-16T16:00Z	0.5	false
2020-01-16T15:45Z	0.492	false
2020-01-16T15:30Z	0.491	false
2020-01-16T15:15Z	0.491	false
2020-01-16T15:00Z	0.491	false
2020-01-16T14:45Z	0.494	false
2020-01-16T14:30Z	0.477	false
2020-01-16T14:15Z	0.489	false
2020-01-16T14:00Z	0.49	false
2020-01-16T13:45Z	0.484	false
2020-01-16T13:30Z	0.483	false
2020-01-16T13:15Z	0.478	false
2020-01-16T13:00Z	0.475	false
2020-01-16T12:45Z	0.466	false
2020-01-16T12:30Z	0.47	false
2020-01-16T12:15Z	0.481	false
2020-01-16T12:00Z	0.474	false
2020-01-16T11:45Z	0.48	false
2020-01-16T11:30Z	0.475	false
2020-01-16T11:15Z	0.476	false
2020-01-16T11:00Z	0.478	false
2020-01-16T10:45Z	0.475	false
2020-01-16T10:30Z	0.476	false
2020-01-16T10:15Z	0.474	false
2020-01-16T10:00Z	0.481	false
2020-01-16T09:45Z	0.473	false
2020-01-16T09:30Z	0.476	false
2020-01-16T09:15Z	0.487	false
2020-01-16T09:00Z	0.485	false
2020-01-16T08:45Z	0.481	false
2020-01-16T08:30Z	0.473	false
2020-01-16T08:15Z	0.474	false
2020-01-16T08:00Z	0.478	false
2020-01-16T07:45Z	0.473	false
2020-01-16T07:30Z	0.475	false
2020-01-16T07:15Z	0.475	false
2020-01-16T07:00Z	0.481	false
2020-01-16T06:45Z	0.478	false
2020-01-16T06:30Z	0.476	false
2020-01-16T06:15Z	0.477	false
2020-01-16T06:00Z	0.484	false
2020-01-16T05:45Z	0.476	false
2020-01-16T05:30Z	0.483	false
2020-01-16T05:15Z	0.479	false
2020-01-16T05:00Z	0.491	false
2020-01-16T04:45Z	0.496	false
2020-01-16T04:30Z	0.501	false
2020-01-16T04:15Z	0.496	false
2020-01-16T04:00Z	0.496	false
2020-01-16T03:45Z	0.502	false
2020-01-16T03:30Z	0.501	false
2020-01-16T03:15Z	0.5	false
2020-01-16T03:00Z	0.507	false
2020-01-16T02:45Z	0.5	false
2020-01-16T02:30Z	0.503	false
2020-01-16T02:15Z	0.505	false
2020-01-16T02:00Z	0.516	false
2020-01-16T01:45Z	0.51	false
2020-01-16T01:30Z	0.505	false
2020-01-16T01:15Z	0.5	false
2020-01-16T01:00Z	0.493	false
2020-01-16T00:45Z	0.502	false
2020-01-16T00:30Z	0.494	false
2020-01-16T00:15Z	0.477	false
2020-01-16T00:00Z	0.489	false
2020-01-15T23:45Z	0.491	false
2020-01-15T23:30Z	0.482	false
2020-01-15T23:15Z	0.484	false
2020-01-15T23:00Z	0.483	false
2020-01-15T22:45Z	0.483	false
2020-01-15T22:30Z	0.494	false
2020-01-15T22:15Z	0.489	false
2020-01-15T22:00Z	0.497	false
2020-01-15T21:45Z	0.5	false
2020-01-15T21:30Z	0.488	false
2020-01-15T21:15Z	0.488	false
2020-01-15T21:00Z	0.484	false
2020-01-15T20:45Z	0.486	false
2020-01-15T20:30Z	0.491	false
2020-01-15T20:15Z	0.482	false
2020-01-15T20:00Z	0.479	false
2020-01-15T19:45Z	0.474	false
2020-01-15T19:30Z	0.476	false
2020-01-15T19:15Z	0.483	false
2020-01-15T19:00Z	0.473	false
2020-01-15T18:45Z	0.459	false
2020-01-15T18:30Z	0.448	false
2020-01-15T18:15Z	0.445	false
2020-01-15T18:00Z	0.433	false
2020-01-15T17:45Z	0.425	false
2020-01-15T17:30Z	0.432	false
2020-01-15T17:15Z	0.425	false
2020-01-15T17:00Z	0.409	false
2020-01-15T16:45Z	0.404	false
2020-01-15T16:30Z	0.404	false
2020-01-15T16:15Z	0.378	false
2020-01-15T16:00Z	0.418	false
2020-01-15T15:45Z	0.413	false
2020-01-15T15:30Z	0.399	false
2020-01-15T15:15Z	0.38	false
2020-01-15T15:00Z	0.392	false
2020-01-15T14:45Z	0.383	false
2020-01-15T14:30Z	0.384	false
2020-01-15T14:15Z	0.374	false

Forecast data

Key information

• Station name: Old Windsor Lock (upstream)
• Station ID: 7172
• River name: River Thames
• Typical range: 0.10m to 0.35m
• Highest level on record: 1.94m on 11 February 2014
• Site datum: 16.12mAOD (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

Share this page

• Twitter
• Facebook
• Email