River level River Thames at Grafton Lock (upstream data)

Check for flood warnings in this area

Latest recorded level 0.05m at 6:15am Sunday 18 April 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 0.38m 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
2021-04-18T05:15Z	0.049	false
2021-04-18T05:00Z	0.048	false
2021-04-18T04:45Z	0.047	false
2021-04-18T04:30Z	0.047	false
2021-04-18T04:15Z	0.046	false
2021-04-18T04:00Z	0.046	false
2021-04-18T03:45Z	0.046	false
2021-04-18T03:30Z	0.045	false
2021-04-18T03:15Z	0.044	false
2021-04-18T03:00Z	0.044	false
2021-04-18T02:45Z	0.043	false
2021-04-18T02:30Z	0.043	false
2021-04-18T02:15Z	0.042	false
2021-04-18T02:00Z	0.042	false
2021-04-18T01:45Z	0.042	false
2021-04-18T01:30Z	0.041	false
2021-04-18T01:15Z	0.041	false
2021-04-18T01:00Z	0.041	false
2021-04-18T00:45Z	0.041	false
2021-04-18T00:30Z	0.04	false
2021-04-18T00:15Z	0.04	false
2021-04-18T00:00Z	0.041	false
2021-04-17T23:45Z	0.04	false
2021-04-17T23:30Z	0.041	false
2021-04-17T23:15Z	0.041	false
2021-04-17T23:00Z	0.041	false
2021-04-17T22:45Z	0.042	false
2021-04-17T22:30Z	0.042	false
2021-04-17T22:15Z	0.042	false
2021-04-17T22:00Z	0.043	false
2021-04-17T21:45Z	0.043	false
2021-04-17T21:30Z	0.044	false
2021-04-17T21:15Z	0.045	false
2021-04-17T21:00Z	0.045	false
2021-04-17T20:45Z	0.047	false
2021-04-17T20:30Z	0.047	false
2021-04-17T20:15Z	0.047	false
2021-04-17T20:00Z	0.048	false
2021-04-17T19:45Z	0.049	false
2021-04-17T19:30Z	0.05	false
2021-04-17T19:15Z	0.052	false
2021-04-17T19:00Z	0.052	false
2021-04-17T18:45Z	0.052	false
2021-04-17T18:30Z	0.053	false
2021-04-17T18:15Z	0.054	false
2021-04-17T18:00Z	0.055	false
2021-04-17T17:45Z	0.055	false
2021-04-17T17:30Z	0.055	false
2021-04-17T17:15Z	0.056	false
2021-04-17T17:00Z	0.057	false
2021-04-17T16:45Z	0.059	false
2021-04-17T16:30Z	0.056	false
2021-04-17T16:15Z	0.057	false
2021-04-17T16:00Z	0.058	false
2021-04-17T15:45Z	0.04	false
2021-04-17T15:30Z	0.057	false
2021-04-17T15:15Z	0.058	false
2021-04-17T15:00Z	0.059	false
2021-04-17T14:45Z	0.057	false
2021-04-17T14:30Z	0.059	false
2021-04-17T14:15Z	0.057	false
2021-04-17T14:00Z	0.057	false
2021-04-17T13:45Z	0.061	false
2021-04-17T13:30Z	0.055	false
2021-04-17T13:15Z	0.06	false
2021-04-17T13:00Z	0.05	false
2021-04-17T12:45Z	0.064	false
2021-04-17T12:30Z	0.063	false
2021-04-17T12:15Z	0.062	false
2021-04-17T12:00Z	0.063	false
2021-04-17T11:45Z	0.062	false
2021-04-17T11:30Z	0.062	false
2021-04-17T11:15Z	0.064	false
2021-04-17T11:00Z	0.061	false
2021-04-17T10:45Z	0.066	false
2021-04-17T10:30Z	0.08	false
2021-04-17T10:15Z	0.05	false
2021-04-17T10:00Z	0.066	false
2021-04-17T09:45Z	0.066	false
2021-04-17T09:30Z	0.064	false
2021-04-17T09:15Z	0.023	false
2021-04-17T09:00Z	0.069	false
2021-04-17T08:45Z	0.055	false
2021-04-17T08:30Z	0.07	false
2021-04-17T08:15Z	0.069	false
2021-04-17T08:00Z	0.069	false
2021-04-17T07:45Z	0.068	false
2021-04-17T07:30Z	0.069	false
2021-04-17T07:15Z	0.068	false
2021-04-17T07:00Z	0.068	false
2021-04-17T06:45Z	0.067	false
2021-04-17T06:30Z	0.068	false
2021-04-17T06:15Z	0.067	false
2021-04-17T06:00Z	0.067	false
2021-04-17T05:45Z	0.066	false
2021-04-17T05:30Z	0.066	false
2021-04-17T05:15Z	0.067	false
2021-04-17T05:00Z	0.065	false
2021-04-17T04:45Z	0.065	false
2021-04-17T04:30Z	0.064	false
2021-04-17T04:15Z	0.064	false
2021-04-17T04:00Z	0.064	false
2021-04-17T03:45Z	0.063	false
2021-04-17T03:30Z	0.063	false
2021-04-17T03:15Z	0.063	false
2021-04-17T03:00Z	0.063	false
2021-04-17T02:45Z	0.062	false
2021-04-17T02:30Z	0.061	false
2021-04-17T02:15Z	0.061	false
2021-04-17T02:00Z	0.06	false
2021-04-17T01:45Z	0.06	false
2021-04-17T01:30Z	0.06	false
2021-04-17T01:15Z	0.06	false
2021-04-17T01:00Z	0.059	false
2021-04-17T00:45Z	0.059	false
2021-04-17T00:30Z	0.059	false
2021-04-17T00:15Z	0.058	false
2021-04-17T00:00Z	0.059	false
2021-04-16T23:45Z	0.058	false
2021-04-16T23:30Z	0.059	false
2021-04-16T23:15Z	0.059	false
2021-04-16T23:00Z	0.059	false
2021-04-16T22:45Z	0.059	false
2021-04-16T22:30Z	0.059	false
2021-04-16T22:15Z	0.06	false
2021-04-16T22:00Z	0.06	false
2021-04-16T21:45Z	0.061	false
2021-04-16T21:30Z	0.062	false
2021-04-16T21:15Z	0.062	false
2021-04-16T21:00Z	0.063	false
2021-04-16T20:45Z	0.063	false
2021-04-16T20:30Z	0.065	false
2021-04-16T20:15Z	0.065	false
2021-04-16T20:00Z	0.066	false
2021-04-16T19:45Z	0.067	false
2021-04-16T19:30Z	0.068	false
2021-04-16T19:15Z	0.068	false
2021-04-16T19:00Z	0.07	false
2021-04-16T18:45Z	0.071	false
2021-04-16T18:30Z	0.071	false
2021-04-16T18:15Z	0.072	false
2021-04-16T18:00Z	0.073	false
2021-04-16T17:45Z	0.073	false
2021-04-16T17:30Z	0.074	false
2021-04-16T17:15Z	0.074	false
2021-04-16T17:00Z	0.075	false
2021-04-16T16:45Z	0.076	false
2021-04-16T16:30Z	0.077	false
2021-04-16T16:15Z	0.078	false
2021-04-16T16:00Z	0.076	false
2021-04-16T15:45Z	0.076	false
2021-04-16T15:30Z	0.076	false
2021-04-16T15:15Z	0.078	false
2021-04-16T15:00Z	0.073	false
2021-04-16T14:45Z	0.082	false
2021-04-16T14:30Z	0.08	false
2021-04-16T14:15Z	0.082	false
2021-04-16T14:00Z	0.082	false
2021-04-16T13:45Z	0.082	false
2021-04-16T13:30Z	0.075	false
2021-04-16T13:15Z	0.085	false
2021-04-16T13:00Z	0.083	false
2021-04-16T12:45Z	0.062	false
2021-04-16T12:30Z	0.088	false
2021-04-16T12:15Z	0.087	false
2021-04-16T12:00Z	0.086	false
2021-04-16T11:45Z	0.087	false
2021-04-16T11:30Z	0.087	false
2021-04-16T11:15Z	0.086	false
2021-04-16T11:00Z	0.083	false
2021-04-16T10:45Z	0.088	false
2021-04-16T10:30Z	0.088	false
2021-04-16T10:15Z	0.09	false
2021-04-16T10:00Z	0.086	false
2021-04-16T09:45Z	0.088	false
2021-04-16T09:30Z	0.088	false
2021-04-16T09:15Z	0.086	false
2021-04-16T09:00Z	0.084	false
2021-04-16T08:45Z	0.093	false
2021-04-16T08:30Z	0.092	false
2021-04-16T08:15Z	0.092	false
2021-04-16T08:00Z	0.091	false
2021-04-16T07:45Z	0.091	false
2021-04-16T07:30Z	0.091	false
2021-04-16T07:15Z	0.091	false
2021-04-16T07:00Z	0.091	false
2021-04-16T06:45Z	0.09	false
2021-04-16T06:30Z	0.091	false
2021-04-16T06:15Z	0.09	false
2021-04-16T06:00Z	0.089	false
2021-04-16T05:45Z	0.089	false
2021-04-16T05:30Z	0.089	false
2021-04-16T05:15Z	0.089	false
2021-04-16T05:00Z	0.088	false
2021-04-16T04:45Z	0.087	false
2021-04-16T04:30Z	0.087	false
2021-04-16T04:15Z	0.086	false
2021-04-16T04:00Z	0.087	false
2021-04-16T03:45Z	0.086	false
2021-04-16T03:30Z	0.084	false
2021-04-16T03:15Z	0.084	false
2021-04-16T03:00Z	0.084	false
2021-04-16T02:45Z	0.083	false
2021-04-16T02:30Z	0.083	false
2021-04-16T02:15Z	0.082	false
2021-04-16T02:00Z	0.082	false
2021-04-16T01:45Z	0.08	false
2021-04-16T01:30Z	0.081	false
2021-04-16T01:15Z	0.08	false
2021-04-16T01:00Z	0.08	false
2021-04-16T00:45Z	0.078	false
2021-04-16T00:30Z	0.078	false
2021-04-16T00:15Z	0.077	false
2021-04-16T00:00Z	0.077	false
2021-04-15T23:45Z	0.077	false
2021-04-15T23:30Z	0.076	false
2021-04-15T23:15Z	0.077	false
2021-04-15T23:00Z	0.076	false
2021-04-15T22:45Z	0.075	false
2021-04-15T22:30Z	0.075	false
2021-04-15T22:15Z	0.076	false
2021-04-15T22:00Z	0.076	false
2021-04-15T21:45Z	0.075	false
2021-04-15T21:30Z	0.075	false
2021-04-15T21:15Z	0.075	false
2021-04-15T21:00Z	0.075	false
2021-04-15T20:45Z	0.075	false
2021-04-15T20:30Z	0.076	false
2021-04-15T20:15Z	0.075	false
2021-04-15T20:00Z	0.075	false
2021-04-15T19:45Z	0.075	false
2021-04-15T19:30Z	0.075	false
2021-04-15T19:15Z	0.075	false
2021-04-15T19:00Z	0.074	false
2021-04-15T18:45Z	0.074	false
2021-04-15T18:30Z	0.073	false
2021-04-15T18:15Z	0.073	false
2021-04-15T18:00Z	0.072	false
2021-04-15T17:45Z	0.071	false
2021-04-15T17:30Z	0.071	false
2021-04-15T17:15Z	0.073	false
2021-04-15T17:00Z	0.074	false
2021-04-15T16:45Z	0.075	false
2021-04-15T16:30Z	0.071	false
2021-04-15T16:15Z	0.072	false
2021-04-15T16:00Z	0.072	false
2021-04-15T15:45Z	0.073	false
2021-04-15T15:30Z	0.069	false
2021-04-15T15:15Z	0.071	false
2021-04-15T15:00Z	0.068	false
2021-04-15T14:45Z	0.069	false
2021-04-15T14:30Z	0.068	false
2021-04-15T14:15Z	0.066	false
2021-04-15T14:00Z	0.067	false
2021-04-15T13:45Z	0.064	false
2021-04-15T13:30Z	0.064	false
2021-04-15T13:15Z	0.063	false
2021-04-15T13:00Z	0.061	false
2021-04-15T12:45Z	0.06	false
2021-04-15T12:30Z	0.062	false
2021-04-15T12:15Z	0.062	false
2021-04-15T12:00Z	0.06	false
2021-04-15T11:45Z	0.06	false
2021-04-15T11:30Z	0.059	false
2021-04-15T11:15Z	0.06	false
2021-04-15T11:00Z	0.05	false
2021-04-15T10:45Z	0.06	false
2021-04-15T10:30Z	0.061	false
2021-04-15T10:15Z	0.062	false
2021-04-15T10:00Z	0.064	false
2021-04-15T09:45Z	0.066	false
2021-04-15T09:30Z	0.068	false
2021-04-15T09:15Z	0.066	false
2021-04-15T09:00Z	0.069	false
2021-04-15T08:45Z	0.069	false
2021-04-15T08:30Z	0.067	false
2021-04-15T08:15Z	0.069	false
2021-04-15T08:00Z	0.069	false
2021-04-15T07:45Z	0.069	false
2021-04-15T07:30Z	0.068	false
2021-04-15T07:15Z	0.068	false
2021-04-15T07:00Z	0.069	false
2021-04-15T06:45Z	0.068	false
2021-04-15T06:30Z	0.068	false
2021-04-15T06:15Z	0.068	false
2021-04-15T06:00Z	0.068	false
2021-04-15T05:45Z	0.067	false
2021-04-15T05:30Z	0.067	false
2021-04-15T05:15Z	0.066	false
2021-04-15T05:00Z	0.066	false
2021-04-15T04:45Z	0.067	false
2021-04-15T04:30Z	0.066	false
2021-04-15T04:15Z	0.065	false
2021-04-15T04:00Z	0.065	false
2021-04-15T03:45Z	0.064	false
2021-04-15T03:30Z	0.064	false
2021-04-15T03:15Z	0.064	false
2021-04-15T03:00Z	0.063	false
2021-04-15T02:45Z	0.063	false
2021-04-15T02:30Z	0.062	false
2021-04-15T02:15Z	0.062	false
2021-04-15T02:00Z	0.062	false
2021-04-15T01:45Z	0.062	false
2021-04-15T01:30Z	0.061	false
2021-04-15T01:15Z	0.06	false
2021-04-15T01:00Z	0.06	false
2021-04-15T00:45Z	0.06	false
2021-04-15T00:30Z	0.06	false
2021-04-15T00:15Z	0.06	false
2021-04-15T00:00Z	0.06	false
2021-04-14T23:45Z	0.059	false
2021-04-14T23:30Z	0.06	false
2021-04-14T23:15Z	0.059	false
2021-04-14T23:00Z	0.059	false
2021-04-14T22:45Z	0.06	false
2021-04-14T22:30Z	0.061	false
2021-04-14T22:15Z	0.06	false
2021-04-14T22:00Z	0.06	false
2021-04-14T21:45Z	0.06	false
2021-04-14T21:30Z	0.06	false
2021-04-14T21:15Z	0.06	false
2021-04-14T21:00Z	0.062	false
2021-04-14T20:45Z	0.062	false
2021-04-14T20:30Z	0.063	false
2021-04-14T20:15Z	0.063	false
2021-04-14T20:00Z	0.064	false
2021-04-14T19:45Z	0.064	false
2021-04-14T19:30Z	0.064	false
2021-04-14T19:15Z	0.066	false
2021-04-14T19:00Z	0.066	false
2021-04-14T18:45Z	0.065	false
2021-04-14T18:30Z	0.065	false
2021-04-14T18:15Z	0.067	false
2021-04-14T18:00Z	0.068	false
2021-04-14T17:45Z	0.069	false
2021-04-14T17:30Z	0.067	false
2021-04-14T17:15Z	0.069	false
2021-04-14T17:00Z	0.07	false
2021-04-14T16:45Z	0.071	false
2021-04-14T16:30Z	0.071	false
2021-04-14T16:15Z	0.071	false
2021-04-14T16:00Z	0.073	false
2021-04-14T15:45Z	0.072	false
2021-04-14T15:30Z	0.073	false
2021-04-14T15:15Z	0.076	false
2021-04-14T15:00Z	0.073	false
2021-04-14T14:45Z	0.074	false
2021-04-14T14:30Z	0.076	false
2021-04-14T14:15Z	0.074	false
2021-04-14T14:00Z	0.076	false
2021-04-14T13:45Z	0.077	false
2021-04-14T13:30Z	0.078	false
2021-04-14T13:15Z	0.079	false
2021-04-14T13:00Z	0.08	false
2021-04-14T12:45Z	0.079	false
2021-04-14T12:30Z	0.079	false
2021-04-14T12:15Z	0.08	false
2021-04-14T12:00Z	0.078	false
2021-04-14T11:45Z	0.078	false
2021-04-14T11:30Z	0.079	false
2021-04-14T11:15Z	0.079	false
2021-04-14T11:00Z	0.075	false
2021-04-14T10:45Z	0.078	false
2021-04-14T10:30Z	0.08	false
2021-04-14T10:15Z	0.079	false
2021-04-14T10:00Z	0.079	false
2021-04-14T09:45Z	0.079	false
2021-04-14T09:30Z	0.08	false
2021-04-14T09:15Z	0.082	false
2021-04-14T09:00Z	0.082	false
2021-04-14T08:45Z	0.08	false
2021-04-14T08:30Z	0.079	false
2021-04-14T08:15Z	0.082	false
2021-04-14T08:00Z	0.081	false
2021-04-14T07:45Z	0.081	false
2021-04-14T07:30Z	0.081	false
2021-04-14T07:15Z	0.081	false
2021-04-14T07:00Z	0.081	false
2021-04-14T06:45Z	0.08	false
2021-04-14T06:30Z	0.08	false
2021-04-14T06:15Z	0.078	false
2021-04-14T06:00Z	0.079	false
2021-04-14T05:45Z	0.079	false
2021-04-14T05:30Z	0.078	false
2021-04-14T05:15Z	0.079	false
2021-04-14T05:00Z	0.078	false
2021-04-14T04:45Z	0.078	false
2021-04-14T04:30Z	0.078	false
2021-04-14T04:15Z	0.077	false
2021-04-14T04:00Z	0.077	false
2021-04-14T03:45Z	0.077	false
2021-04-14T03:30Z	0.077	false
2021-04-14T03:15Z	0.077	false
2021-04-14T03:00Z	0.076	false
2021-04-14T02:45Z	0.075	false
2021-04-14T02:30Z	0.076	false
2021-04-14T02:15Z	0.075	false
2021-04-14T02:00Z	0.075	false
2021-04-14T01:45Z	0.074	false
2021-04-14T01:30Z	0.074	false
2021-04-14T01:15Z	0.074	false
2021-04-14T01:00Z	0.074	false
2021-04-14T00:45Z	0.073	false
2021-04-14T00:30Z	0.074	false
2021-04-14T00:15Z	0.073	false
2021-04-14T00:00Z	0.073	false
2021-04-13T23:45Z	0.073	false
2021-04-13T23:30Z	0.073	false
2021-04-13T23:15Z	0.073	false
2021-04-13T23:00Z	0.073	false
2021-04-13T22:45Z	0.073	false
2021-04-13T22:30Z	0.073	false
2021-04-13T22:15Z	0.074	false
2021-04-13T22:00Z	0.074	false
2021-04-13T21:45Z	0.074	false
2021-04-13T21:30Z	0.075	false
2021-04-13T21:15Z	0.075	false
2021-04-13T21:00Z	0.076	false
2021-04-13T20:45Z	0.076	false
2021-04-13T20:30Z	0.077	false
2021-04-13T20:15Z	0.078	false
2021-04-13T20:00Z	0.079	false
2021-04-13T19:45Z	0.08	false
2021-04-13T19:30Z	0.081	false
2021-04-13T19:15Z	0.082	false
2021-04-13T19:00Z	0.082	false
2021-04-13T18:45Z	0.084	false
2021-04-13T18:30Z	0.085	false
2021-04-13T18:15Z	0.085	false
2021-04-13T18:00Z	0.085	false
2021-04-13T17:45Z	0.086	false
2021-04-13T17:30Z	0.086	false
2021-04-13T17:15Z	0.09	false
2021-04-13T17:00Z	0.089	false
2021-04-13T16:45Z	0.091	false
2021-04-13T16:30Z	0.092	false
2021-04-13T16:15Z	0.093	false
2021-04-13T16:00Z	0.093	false
2021-04-13T15:45Z	0.094	false
2021-04-13T15:30Z	0.093	false
2021-04-13T15:15Z	0.097	false
2021-04-13T15:00Z	0.103	false
2021-04-13T14:45Z	0.099	false
2021-04-13T14:30Z	0.102	false
2021-04-13T14:15Z	0.101	false
2021-04-13T14:00Z	0.102	false
2021-04-13T13:45Z	0.102	false
2021-04-13T13:30Z	0.103	false
2021-04-13T13:15Z	0.105	false
2021-04-13T13:00Z	0.105	false
2021-04-13T12:45Z	0.108	false
2021-04-13T12:30Z	0.105	false
2021-04-13T12:15Z	0.106	false
2021-04-13T12:00Z	0.107	false
2021-04-13T11:45Z	0.106	false
2021-04-13T11:30Z	0.107	false
2021-04-13T11:15Z	0.107	false
2021-04-13T11:00Z	0.106	false
2021-04-13T10:45Z	0.107	false
2021-04-13T10:30Z	0.106	false
2021-04-13T10:15Z	0.106	false
2021-04-13T10:00Z	0.107	false
2021-04-13T09:45Z	0.106	false
2021-04-13T09:30Z	0.106	false
2021-04-13T09:15Z	0.105	false
2021-04-13T09:00Z	0.105	false
2021-04-13T08:45Z	0.104	false
2021-04-13T08:30Z	0.104	false
2021-04-13T08:15Z	0.105	false
2021-04-13T08:00Z	0.104	false
2021-04-13T07:45Z	0.103	false
2021-04-13T07:30Z	0.104	false
2021-04-13T07:15Z	0.104	false
2021-04-13T07:00Z	0.103	false
2021-04-13T06:45Z	0.102	false
2021-04-13T06:30Z	0.103	false
2021-04-13T06:15Z	0.102	false
2021-04-13T06:00Z	0.103	false
2021-04-13T05:45Z	0.102	false
2021-04-13T05:30Z	0.103	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
• Check the long term flood risk for an area in England.

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