River level River Thames at Grafton Lock (upstream data)

The latest River level recorded is unreliable.

Reasons for this include very low river levels or a technical fault with the measuring equipment.

Use the map to select another station.

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

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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
2021-01-18T17:30Z		true
2021-01-18T17:15Z		true
2021-01-18T17:00Z		true
2021-01-18T16:45Z		true
2021-01-18T16:30Z		true
2021-01-18T16:15Z		true
2021-01-18T16:00Z		true
2021-01-18T15:45Z		true
2021-01-18T15:30Z		true
2021-01-18T15:15Z		true
2021-01-18T15:00Z		true
2021-01-18T14:45Z		true
2021-01-18T14:30Z		true
2021-01-18T14:15Z		true
2021-01-18T14:00Z		true
2021-01-18T13:45Z		true
2021-01-18T13:30Z		true
2021-01-18T13:15Z		true
2021-01-18T13:00Z		true
2021-01-18T12:45Z		true
2021-01-18T12:30Z		true
2021-01-18T12:15Z		true
2021-01-18T12:00Z		true
2021-01-18T11:45Z		true
2021-01-18T11:30Z		true
2021-01-18T11:15Z		true
2021-01-18T11:00Z		true
2021-01-18T10:45Z		true
2021-01-18T10:30Z		true
2021-01-18T10:15Z		true
2021-01-18T10:00Z		true
2021-01-18T09:45Z		true
2021-01-18T09:30Z		true
2021-01-18T09:15Z		true
2021-01-18T09:00Z		true
2021-01-18T08:45Z		true
2021-01-18T08:30Z		true
2021-01-18T08:15Z		true
2021-01-18T08:00Z		true
2021-01-18T07:45Z	0.003	false
2021-01-18T07:30Z	0	false
2021-01-18T07:15Z	0.001	false
2021-01-18T07:00Z	0	false
2021-01-18T06:45Z	0.002	false
2021-01-18T06:30Z	0.007	false
2021-01-18T06:15Z	0.004	false
2021-01-18T06:00Z	0.002	false
2021-01-18T05:45Z	0.005	false
2021-01-18T05:30Z	0.011	false
2021-01-18T05:15Z	0.008	false
2021-01-18T05:00Z	0.001	false
2021-01-18T04:45Z	0.003	false
2021-01-18T04:30Z	0.005	false
2021-01-18T04:15Z	0.007	false
2021-01-18T04:00Z	0.009	false
2021-01-18T03:45Z	0.005	false
2021-01-18T03:30Z	0.01	false
2021-01-18T03:15Z	0.007	false
2021-01-18T03:00Z	0.012	false
2021-01-18T02:45Z	0.012	false
2021-01-18T02:30Z	0.016	false
2021-01-18T02:15Z	0.022	false
2021-01-18T02:00Z	0.017	false
2021-01-18T01:45Z	0.011	false
2021-01-18T01:30Z	0.017	false
2021-01-18T01:15Z	0.019	false
2021-01-18T01:00Z	0.02	false
2021-01-18T00:45Z	0.022	false
2021-01-18T00:30Z	0.021	false
2021-01-18T00:15Z	0.024	false
2021-01-18T00:00Z	0.025	false
2021-01-17T23:45Z	0.022	false
2021-01-17T23:30Z	0.023	false
2021-01-17T23:15Z	0.022	false
2021-01-17T23:00Z	0.024	false
2021-01-17T22:45Z	0.027	false
2021-01-17T22:30Z	0.021	false
2021-01-17T22:15Z	0.026	false
2021-01-17T22:00Z	0.029	false
2021-01-17T21:45Z	0.029	false
2021-01-17T21:30Z	0.032	false
2021-01-17T21:15Z	0.031	false
2021-01-17T21:00Z	0.03	false
2021-01-17T20:45Z	0.037	false
2021-01-17T20:30Z	0.036	false
2021-01-17T20:15Z	0.036	false
2021-01-17T20:00Z	0.036	false
2021-01-17T19:45Z	0.037	false
2021-01-17T19:30Z	0.043	false
2021-01-17T19:15Z	0.037	false
2021-01-17T19:00Z	0.037	false
2021-01-17T18:45Z	0.04	false
2021-01-17T18:30Z	0.045	false
2021-01-17T18:15Z	0.039	false
2021-01-17T18:00Z	0.04	false
2021-01-17T17:45Z	0.045	false
2021-01-17T17:30Z	0.045	false
2021-01-17T17:15Z	0.048	false
2021-01-17T17:00Z	0.047	false
2021-01-17T16:45Z	0.051	false
2021-01-17T16:30Z	0.053	false
2021-01-17T16:15Z	0.052	false
2021-01-17T16:00Z	0.048	false
2021-01-17T15:45Z	0.05	false
2021-01-17T15:30Z	0.051	false
2021-01-17T15:15Z	0.053	false
2021-01-17T15:00Z	0.053	false
2021-01-17T14:45Z	0.053	false
2021-01-17T14:30Z	0.058	false
2021-01-17T14:15Z	0.058	false
2021-01-17T14:00Z	0.059	false
2021-01-17T13:45Z	0.059	false
2021-01-17T13:30Z	0.061	false
2021-01-17T13:15Z	0.063	false
2021-01-17T13:00Z	0.061	false
2021-01-17T12:45Z	0.069	false
2021-01-17T12:30Z	0.063	false
2021-01-17T12:15Z	0.065	false
2021-01-17T12:00Z	0.069	false
2021-01-17T11:45Z	0.062	false
2021-01-17T11:30Z	0.067	false
2021-01-17T11:15Z	0.063	false
2021-01-17T11:00Z	0.068	false
2021-01-17T10:45Z	0.071	false
2021-01-17T10:30Z	0.068	false
2021-01-17T10:15Z	0.066	false
2021-01-17T10:00Z	0.072	false
2021-01-17T09:45Z	0.069	false
2021-01-17T09:30Z	0.069	false
2021-01-17T09:15Z	0.065	false
2021-01-17T09:00Z	0.068	false
2021-01-17T08:45Z	0.073	false
2021-01-17T08:30Z	0.073	false
2021-01-17T08:15Z	0.069	false
2021-01-17T08:00Z	0.074	false
2021-01-17T07:45Z	0.073	false
2021-01-17T07:30Z	0.074	false
2021-01-17T07:15Z	0.074	false
2021-01-17T07:00Z	0.076	false
2021-01-17T06:45Z	0.073	false
2021-01-17T06:30Z	0.072	false
2021-01-17T06:15Z	0.067	false
2021-01-17T06:00Z	0.074	false
2021-01-17T05:45Z	0.074	false
2021-01-17T05:30Z	0.062	false
2021-01-17T05:15Z	0.071	false
2021-01-17T05:00Z	0.066	false
2021-01-17T04:45Z	0.068	false
2021-01-17T04:30Z	0.066	false
2021-01-17T04:15Z	0.071	false
2021-01-17T04:00Z	0.065	false
2021-01-17T03:45Z	0.068	false
2021-01-17T03:30Z	0.072	false
2021-01-17T03:15Z	0.062	false
2021-01-17T03:00Z	0.071	false
2021-01-17T02:45Z	0.059	false
2021-01-17T02:30Z	0.061	false
2021-01-17T02:15Z	0.062	false
2021-01-17T02:00Z	0.063	false
2021-01-17T01:45Z	0.064	false
2021-01-17T01:30Z	0.062	false
2021-01-17T01:15Z	0.055	false
2021-01-17T01:00Z	0.05	false
2021-01-17T00:45Z	0.058	false
2021-01-17T00:30Z	0.056	false
2021-01-17T00:15Z	0.055	false
2021-01-17T00:00Z	0.048	false
2021-01-16T23:45Z	0.051	false
2021-01-16T23:30Z	0.052	false
2021-01-16T23:15Z	0.047	false
2021-01-16T23:00Z	0.047	false
2021-01-16T22:45Z	0.042	false
2021-01-16T22:30Z	0.037	false
2021-01-16T22:15Z	0.039	false
2021-01-16T22:00Z	0.034	false
2021-01-16T21:45Z	0.038	false
2021-01-16T21:30Z	0.032	false
2021-01-16T21:15Z	0.035	false
2021-01-16T21:00Z	0.035	false
2021-01-16T20:45Z	0.029	false
2021-01-16T20:30Z	0.033	false
2021-01-16T20:15Z	0.029	false
2021-01-16T20:00Z	0.03	false
2021-01-16T19:45Z	0.03	false
2021-01-16T19:30Z	0.026	false
2021-01-16T19:15Z	0.021	false
2021-01-16T19:00Z	0.023	false
2021-01-16T18:45Z	0.024	false
2021-01-16T18:30Z	0.023	false
2021-01-16T18:15Z	0.02	false
2021-01-16T18:00Z	0.016	false
2021-01-16T17:45Z	0.021	false
2021-01-16T17:30Z	0.016	false
2021-01-16T17:15Z	0.013	false
2021-01-16T17:00Z	0.012	false
2021-01-16T16:45Z	0.012	false
2021-01-16T16:30Z	0.008	false
2021-01-16T16:15Z	0.01	false
2021-01-16T16:00Z	0.012	false
2021-01-16T15:45Z	0.011	false
2021-01-16T15:30Z	0.008	false
2021-01-16T15:15Z	0.003	false
2021-01-16T15:00Z	0.001	false
2021-01-16T14:45Z	0.006	false
2021-01-16T14:30Z	0.002	false
2021-01-16T14:15Z		true
2021-01-16T14:00Z		true
2021-01-16T13:45Z	0.004	false
2021-01-16T13:30Z		true
2021-01-16T13:15Z		true
2021-01-16T13:00Z		true
2021-01-16T12:45Z		true
2021-01-16T12:30Z		true
2021-01-16T12:15Z		true
2021-01-16T12:00Z		true
2021-01-16T11:45Z		true
2021-01-16T11:30Z		true
2021-01-16T11:15Z		true
2021-01-16T11:00Z		true
2021-01-16T10:45Z		true
2021-01-16T10:30Z		true
2021-01-16T10:15Z		true
2021-01-16T10:00Z		true
2021-01-16T09:45Z		true
2021-01-16T09:30Z		true
2021-01-16T09:15Z		true
2021-01-16T09:00Z		true
2021-01-16T08:45Z		true
2021-01-16T08:30Z		true
2021-01-16T08:15Z		true
2021-01-16T08:00Z		true
2021-01-16T07:45Z		true
2021-01-16T07:30Z		true
2021-01-16T07:15Z		true
2021-01-16T07:00Z		true
2021-01-16T06:45Z		true
2021-01-16T06:30Z		true
2021-01-16T06:15Z		true
2021-01-16T06:00Z		true
2021-01-16T05:45Z		true
2021-01-16T05:30Z		true
2021-01-16T05:15Z		true
2021-01-16T05:00Z		true
2021-01-16T04:45Z		true
2021-01-16T04:30Z		true
2021-01-16T04:15Z		true
2021-01-16T04:00Z		true
2021-01-16T03:45Z		true
2021-01-16T03:30Z		true
2021-01-16T03:15Z		true
2021-01-16T03:00Z		true
2021-01-16T02:45Z		true
2021-01-16T02:30Z		true
2021-01-16T02:15Z		true
2021-01-16T02:00Z		true
2021-01-16T01:45Z		true
2021-01-16T01:30Z		true
2021-01-16T01:15Z		true
2021-01-16T01:00Z		true
2021-01-16T00:45Z		true
2021-01-16T00:30Z		true
2021-01-16T00:15Z		true
2021-01-16T00:00Z		true
2021-01-15T23:45Z		true
2021-01-15T23:30Z		true
2021-01-15T23:15Z		true
2021-01-15T23:00Z		true
2021-01-15T22:45Z		true
2021-01-15T22:30Z		true
2021-01-15T22:15Z		true
2021-01-15T22:00Z	0.004	false
2021-01-15T21:45Z		true
2021-01-15T21:30Z	0.003	false
2021-01-15T21:15Z		true
2021-01-15T21:00Z	0.001	false
2021-01-15T20:45Z	0.006	false
2021-01-15T20:30Z		true
2021-01-15T20:15Z	0.008	false
2021-01-15T20:00Z	0.004	false
2021-01-15T19:45Z	0.004	false
2021-01-15T19:30Z	0.01	false
2021-01-15T19:15Z	0.01	false
2021-01-15T19:00Z	0.011	false
2021-01-15T18:45Z	0.008	false
2021-01-15T18:30Z	0.011	false
2021-01-15T18:15Z	0.012	false
2021-01-15T18:00Z	0.01	false
2021-01-15T17:45Z	0.011	false
2021-01-15T17:30Z	0.018	false
2021-01-15T17:15Z	0.015	false
2021-01-15T17:00Z	0.018	false
2021-01-15T16:45Z	0.015	false
2021-01-15T16:30Z	0.02	false
2021-01-15T16:15Z	0.023	false
2021-01-15T16:00Z	0.02	false
2021-01-15T15:45Z	0.026	false
2021-01-15T15:30Z	0.027	false
2021-01-15T15:15Z	0.017	false
2021-01-15T15:00Z	0.025	false
2021-01-15T14:45Z	0.021	false
2021-01-15T14:30Z	0.025	false
2021-01-15T14:15Z	0.025	false
2021-01-15T14:00Z	0.029	false
2021-01-15T13:45Z	0.024	false
2021-01-15T13:30Z	0.031	false
2021-01-15T13:15Z	0.03	false
2021-01-15T13:00Z	0.029	false
2021-01-15T12:45Z	0.03	false
2021-01-15T12:30Z	0.034	false
2021-01-15T12:15Z	0.031	false
2021-01-15T12:00Z	0.032	false
2021-01-15T11:45Z	0.032	false
2021-01-15T11:30Z	0.038	false
2021-01-15T11:15Z	0.034	false
2021-01-15T11:00Z	0.031	false
2021-01-15T10:45Z	0.039	false
2021-01-15T10:30Z	0.041	false
2021-01-15T10:15Z	0.04	false
2021-01-15T10:00Z	0.044	false
2021-01-15T09:45Z	0.041	false
2021-01-15T09:30Z	0.041	false
2021-01-15T09:15Z	0.04	false
2021-01-15T09:00Z	0.044	false
2021-01-15T08:45Z	0.043	false
2021-01-15T08:30Z	0.041	false
2021-01-15T08:15Z	0.045	false
2021-01-15T08:00Z	0.044	false
2021-01-15T07:45Z	0.04	false
2021-01-15T07:30Z	0.044	false
2021-01-15T07:15Z	0.042	false
2021-01-15T07:00Z	0.042	false
2021-01-15T06:45Z	0.043	false
2021-01-15T06:30Z	0.043	false
2021-01-15T06:15Z	0.037	false
2021-01-15T06:00Z	0.048	false
2021-01-15T05:45Z	0.043	false
2021-01-15T05:30Z	0.044	false
2021-01-15T05:15Z	0.042	false
2021-01-15T05:00Z	0.041	false
2021-01-15T04:45Z	0.038	false
2021-01-15T04:30Z	0.048	false
2021-01-15T04:15Z	0.046	false
2021-01-15T04:00Z	0.041	false
2021-01-15T03:45Z	0.042	false
2021-01-15T03:30Z	0.042	false
2021-01-15T03:15Z	0.045	false
2021-01-15T03:00Z	0.043	false
2021-01-15T02:45Z	0.042	false
2021-01-15T02:30Z	0.038	false
2021-01-15T02:15Z	0.039	false
2021-01-15T02:00Z	0.039	false
2021-01-15T01:45Z	0.04	false
2021-01-15T01:30Z	0.04	false
2021-01-15T01:15Z	0.041	false
2021-01-15T01:00Z	0.036	false
2021-01-15T00:45Z	0.035	false
2021-01-15T00:30Z	0.033	false
2021-01-15T00:15Z	0.037	false
2021-01-15T00:00Z	0.031	false
2021-01-14T23:45Z	0.043	false
2021-01-14T23:30Z	0.033	false
2021-01-14T23:15Z	0.036	false
2021-01-14T23:00Z	0.036	false
2021-01-14T22:45Z	0.041	false
2021-01-14T22:30Z	0.035	false
2021-01-14T22:15Z	0.035	false
2021-01-14T22:00Z	0.035	false
2021-01-14T21:45Z	0.036	false
2021-01-14T21:30Z	0.038	false
2021-01-14T21:15Z	0.038	false
2021-01-14T21:00Z	0.031	false
2021-01-14T20:45Z	0.033	false
2021-01-14T20:30Z	0.037	false
2021-01-14T20:15Z	0.032	false
2021-01-14T20:00Z	0.029	false
2021-01-14T19:45Z	0.038	false
2021-01-14T19:30Z	0.033	false
2021-01-14T19:15Z	0.034	false
2021-01-14T19:00Z	0.03	false
2021-01-14T18:45Z	0.033	false
2021-01-14T18:30Z	0.037	false
2021-01-14T18:15Z	0.036	false
2021-01-14T18:00Z	0.035	false
2021-01-14T17:45Z	0.035	false
2021-01-14T17:30Z	0.035	false
2021-01-14T17:15Z	0.035	false
2021-01-14T17:00Z	0.032	false
2021-01-14T16:45Z	0.034	false
2021-01-14T16:30Z	0.034	false
2021-01-14T16:15Z	0.033	false
2021-01-14T16:00Z	0.033	false
2021-01-14T15:45Z	0.03	false
2021-01-14T15:30Z	0.032	false
2021-01-14T15:15Z	0.032	false
2021-01-14T15:00Z	0.034	false
2021-01-14T14:45Z	0.037	false
2021-01-14T14:30Z	0.035	false
2021-01-14T14:15Z	0.042	false
2021-01-14T14:00Z	0.034	false
2021-01-14T13:45Z	0.037	false
2021-01-14T13:30Z	0.033	false
2021-01-14T13:15Z	0.036	false
2021-01-14T13:00Z	0.036	false
2021-01-14T12:45Z	0.035	false
2021-01-14T12:30Z	0.032	false
2021-01-14T12:15Z	0.035	false
2021-01-14T12:00Z	0.032	false
2021-01-14T11:45Z	0.032	false
2021-01-14T11:30Z	0.035	false
2021-01-14T11:15Z	0.033	false
2021-01-14T11:00Z	0.037	false
2021-01-14T10:45Z	0.034	false
2021-01-14T10:30Z	0.035	false
2021-01-14T10:15Z	0.037	false
2021-01-14T10:00Z	0.032	false
2021-01-14T09:45Z	0.037	false
2021-01-14T09:30Z	0.031	false
2021-01-14T09:15Z	0.038	false
2021-01-14T09:00Z	0.034	false
2021-01-14T08:45Z	0.037	false
2021-01-14T08:30Z	0.035	false
2021-01-14T08:15Z	0.034	false
2021-01-14T08:00Z	0.032	false
2021-01-14T07:45Z	0.034	false
2021-01-14T07:30Z	0.033	false
2021-01-14T07:15Z	0.028	false
2021-01-14T07:00Z	0.026	false
2021-01-14T06:45Z	0.032	false
2021-01-14T06:30Z	0.025	false
2021-01-14T06:15Z	0.029	false
2021-01-14T06:00Z	0.031	false
2021-01-14T05:45Z	0.031	false
2021-01-14T05:30Z	0.034	false
2021-01-14T05:15Z	0.033	false
2021-01-14T05:00Z	0.029	false
2021-01-14T04:45Z	0.028	false
2021-01-14T04:30Z	0.032	false
2021-01-14T04:15Z	0.035	false
2021-01-14T04:00Z	0.03	false
2021-01-14T03:45Z	0.029	false
2021-01-14T03:30Z	0.024	false
2021-01-14T03:15Z	0.029	false
2021-01-14T03:00Z	0.028	false
2021-01-14T02:45Z	0.033	false
2021-01-14T02:30Z	0.025	false
2021-01-14T02:15Z	0.026	false
2021-01-14T02:00Z	0.026	false
2021-01-14T01:45Z	0.026	false
2021-01-14T01:30Z	0.024	false
2021-01-14T01:15Z	0.022	false
2021-01-14T01:00Z	0.029	false
2021-01-14T00:45Z	0.026	false
2021-01-14T00:30Z	0.028	false
2021-01-14T00:15Z	0.029	false
2021-01-14T00:00Z	0.033	false
2021-01-13T23:45Z	0.029	false
2021-01-13T23:30Z	0.024	false
2021-01-13T23:15Z	0.035	false
2021-01-13T23:00Z	0.028	false
2021-01-13T22:45Z	0.029	false
2021-01-13T22:30Z	0.025	false
2021-01-13T22:15Z	0.029	false
2021-01-13T22:00Z	0.027	false
2021-01-13T21:45Z	0.031	false
2021-01-13T21:30Z	0.028	false
2021-01-13T21:15Z	0.032	false
2021-01-13T21:00Z	0.034	false
2021-01-13T20:45Z	0.027	false
2021-01-13T20:30Z	0.027	false
2021-01-13T20:15Z	0.03	false
2021-01-13T20:00Z	0.028	false
2021-01-13T19:45Z	0.028	false
2021-01-13T19:30Z	0.03	false
2021-01-13T19:15Z	0.034	false
2021-01-13T19:00Z	0.028	false
2021-01-13T18:45Z	0.023	false
2021-01-13T18:30Z	0.03	false
2021-01-13T18:15Z	0.032	false
2021-01-13T18:00Z	0.032	false
2021-01-13T17:45Z	0.029	false
2021-01-13T17:30Z	0.037	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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