River level River Chess at Rickmansworth (upstream data)

Check for flood warnings in this area

Latest recorded level 0.17m at 6:00pm Tuesday 25 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 0.30m 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
2020-02-25T18:00Z	0.169	false
2020-02-25T17:45Z	0.169	false
2020-02-25T17:30Z	0.169	false
2020-02-25T17:15Z	0.169	false
2020-02-25T17:00Z	0.168	false
2020-02-25T16:45Z	0.168	false
2020-02-25T16:30Z	0.169	false
2020-02-25T16:15Z	0.168	false
2020-02-25T16:00Z	0.168	false
2020-02-25T15:45Z	0.169	false
2020-02-25T15:30Z	0.169	false
2020-02-25T15:15Z	0.169	false
2020-02-25T15:00Z	0.169	false
2020-02-25T14:45Z	0.169	false
2020-02-25T14:30Z	0.169	false
2020-02-25T14:15Z	0.17	false
2020-02-25T14:00Z	0.169	false
2020-02-25T13:45Z	0.17	false
2020-02-25T13:30Z	0.17	false
2020-02-25T13:15Z	0.17	false
2020-02-25T13:00Z	0.169	false
2020-02-25T12:45Z	0.169	false
2020-02-25T12:30Z	0.169	false
2020-02-25T12:15Z	0.17	false
2020-02-25T12:00Z	0.171	false
2020-02-25T11:45Z	0.17	false
2020-02-25T11:30Z	0.171	false
2020-02-25T11:15Z	0.171	false
2020-02-25T11:00Z	0.171	false
2020-02-25T10:45Z	0.171	false
2020-02-25T10:30Z	0.172	false
2020-02-25T10:15Z	0.173	false
2020-02-25T10:00Z	0.175	false
2020-02-25T09:45Z	0.171	false
2020-02-25T09:30Z	0.171	false
2020-02-25T09:15Z	0.172	false
2020-02-25T09:00Z	0.172	false
2020-02-25T08:45Z	0.172	false
2020-02-25T08:30Z	0.171	false
2020-02-25T08:15Z	0.171	false
2020-02-25T08:00Z	0.171	false
2020-02-25T07:45Z	0.171	false
2020-02-25T07:30Z	0.172	false
2020-02-25T07:15Z	0.172	false
2020-02-25T07:00Z	0.172	false
2020-02-25T06:45Z	0.173	false
2020-02-25T06:30Z	0.172	false
2020-02-25T06:15Z	0.173	false
2020-02-25T06:00Z	0.173	false
2020-02-25T05:45Z	0.173	false
2020-02-25T05:30Z	0.174	false
2020-02-25T05:15Z	0.174	false
2020-02-25T05:00Z	0.174	false
2020-02-25T04:45Z	0.174	false
2020-02-25T04:30Z	0.174	false
2020-02-25T04:15Z	0.175	false
2020-02-25T04:00Z	0.175	false
2020-02-25T03:45Z	0.176	false
2020-02-25T03:30Z	0.175	false
2020-02-25T03:15Z	0.175	false
2020-02-25T03:00Z	0.176	false
2020-02-25T02:45Z	0.176	false
2020-02-25T02:30Z	0.177	false
2020-02-25T02:15Z	0.177	false
2020-02-25T02:00Z	0.177	false
2020-02-25T01:45Z	0.177	false
2020-02-25T01:30Z	0.177	false
2020-02-25T01:15Z	0.177	false
2020-02-25T01:00Z	0.177	false
2020-02-25T00:45Z	0.178	false
2020-02-25T00:30Z	0.177	false
2020-02-25T00:15Z	0.178	false
2020-02-25T00:00Z	0.178	false
2020-02-24T23:45Z	0.178	false
2020-02-24T23:30Z	0.178	false
2020-02-24T23:15Z	0.177	false
2020-02-24T23:00Z	0.178	false
2020-02-24T22:45Z	0.178	false
2020-02-24T22:30Z	0.178	false
2020-02-24T22:15Z	0.178	false
2020-02-24T22:00Z	0.178	false
2020-02-24T21:45Z	0.178	false
2020-02-24T21:30Z	0.178	false
2020-02-24T21:15Z	0.178	false
2020-02-24T21:00Z	0.178	false
2020-02-24T20:45Z	0.178	false
2020-02-24T20:30Z	0.178	false
2020-02-24T20:15Z	0.177	false
2020-02-24T20:00Z	0.178	false
2020-02-24T19:45Z	0.178	false
2020-02-24T19:30Z	0.177	false
2020-02-24T19:15Z	0.177	false
2020-02-24T19:00Z	0.178	false
2020-02-24T18:45Z	0.177	false
2020-02-24T18:30Z	0.178	false
2020-02-24T18:15Z	0.177	false
2020-02-24T18:00Z	0.177	false
2020-02-24T17:45Z	0.176	false
2020-02-24T17:30Z	0.176	false
2020-02-24T17:15Z	0.176	false
2020-02-24T17:00Z	0.175	false
2020-02-24T16:45Z	0.175	false
2020-02-24T16:30Z	0.175	false
2020-02-24T16:15Z	0.175	false
2020-02-24T16:00Z	0.174	false
2020-02-24T15:45Z	0.175	false
2020-02-24T15:30Z	0.174	false
2020-02-24T15:15Z	0.174	false
2020-02-24T15:00Z	0.175	false
2020-02-24T14:45Z	0.175	false
2020-02-24T14:30Z	0.176	false
2020-02-24T14:15Z	0.176	false
2020-02-24T14:00Z	0.175	false
2020-02-24T13:45Z	0.175	false
2020-02-24T13:30Z	0.174	false
2020-02-24T13:15Z	0.174	false
2020-02-24T13:00Z	0.173	false
2020-02-24T12:45Z	0.173	false
2020-02-24T12:30Z	0.172	false
2020-02-24T12:15Z	0.172	false
2020-02-24T12:00Z	0.17	false
2020-02-24T11:45Z	0.169	false
2020-02-24T11:30Z	0.169	false
2020-02-24T11:15Z	0.168	false
2020-02-24T11:00Z	0.168	false
2020-02-24T10:45Z	0.167	false
2020-02-24T10:30Z	0.166	false
2020-02-24T10:15Z	0.166	false
2020-02-24T10:00Z	0.165	false
2020-02-24T09:45Z	0.166	false
2020-02-24T09:30Z	0.166	false
2020-02-24T09:15Z	0.166	false
2020-02-24T09:00Z	0.165	false
2020-02-24T08:45Z	0.166	false
2020-02-24T08:30Z	0.165	false
2020-02-24T08:15Z	0.166	false
2020-02-24T08:00Z	0.165	false
2020-02-24T07:45Z	0.166	false
2020-02-24T07:30Z	0.165	false
2020-02-24T07:15Z	0.165	false
2020-02-24T07:00Z	0.165	false
2020-02-24T06:45Z	0.165	false
2020-02-24T06:30Z	0.165	false
2020-02-24T06:15Z	0.165	false
2020-02-24T06:00Z	0.164	false
2020-02-24T05:45Z	0.164	false
2020-02-24T05:30Z	0.164	false
2020-02-24T05:15Z	0.163	false
2020-02-24T05:00Z	0.163	false
2020-02-24T04:45Z	0.163	false
2020-02-24T04:30Z	0.162	false
2020-02-24T04:15Z	0.162	false
2020-02-24T04:00Z	0.161	false
2020-02-24T03:45Z	0.161	false
2020-02-24T03:30Z	0.16	false
2020-02-24T03:15Z	0.161	false
2020-02-24T03:00Z	0.161	false
2020-02-24T02:45Z	0.16	false
2020-02-24T02:30Z	0.159	false
2020-02-24T02:15Z	0.16	false
2020-02-24T02:00Z	0.16	false
2020-02-24T01:45Z	0.16	false
2020-02-24T01:30Z	0.16	false
2020-02-24T01:15Z	0.159	false
2020-02-24T01:00Z	0.16	false
2020-02-24T00:45Z	0.16	false
2020-02-24T00:30Z	0.16	false
2020-02-24T00:15Z	0.159	false
2020-02-24T00:00Z	0.16	false
2020-02-23T23:45Z	0.161	false
2020-02-23T23:30Z	0.161	false
2020-02-23T23:15Z	0.161	false
2020-02-23T23:00Z	0.161	false
2020-02-23T22:45Z	0.161	false
2020-02-23T22:30Z	0.162	false
2020-02-23T22:15Z	0.162	false
2020-02-23T22:00Z	0.162	false
2020-02-23T21:45Z	0.162	false
2020-02-23T21:30Z	0.163	false
2020-02-23T21:15Z	0.162	false
2020-02-23T21:00Z	0.163	false
2020-02-23T20:45Z	0.163	false
2020-02-23T20:30Z	0.163	false
2020-02-23T20:15Z	0.163	false
2020-02-23T20:00Z	0.163	false
2020-02-23T19:45Z	0.164	false
2020-02-23T19:30Z	0.163	false
2020-02-23T19:15Z	0.164	false
2020-02-23T19:00Z	0.164	false
2020-02-23T18:45Z	0.163	false
2020-02-23T18:30Z	0.164	false
2020-02-23T18:15Z	0.164	false
2020-02-23T18:00Z	0.163	false
2020-02-23T17:45Z	0.163	false
2020-02-23T17:30Z	0.164	false
2020-02-23T17:15Z	0.163	false
2020-02-23T17:00Z	0.163	false
2020-02-23T16:45Z	0.162	false
2020-02-23T16:30Z	0.162	false
2020-02-23T16:15Z	0.162	false
2020-02-23T16:00Z	0.162	false
2020-02-23T15:45Z	0.162	false
2020-02-23T15:30Z	0.162	false
2020-02-23T15:15Z	0.162	false
2020-02-23T15:00Z	0.162	false
2020-02-23T14:45Z	0.162	false
2020-02-23T14:30Z	0.161	false
2020-02-23T14:15Z	0.162	false
2020-02-23T14:00Z	0.161	false
2020-02-23T13:45Z	0.162	false
2020-02-23T13:30Z	0.162	false
2020-02-23T13:15Z	0.162	false
2020-02-23T13:00Z	0.162	false
2020-02-23T12:45Z	0.162	false
2020-02-23T12:30Z	0.162	false
2020-02-23T12:15Z	0.162	false
2020-02-23T12:00Z	0.162	false
2020-02-23T11:45Z	0.162	false
2020-02-23T11:30Z	0.163	false
2020-02-23T11:15Z	0.162	false
2020-02-23T11:00Z	0.162	false
2020-02-23T10:45Z	0.162	false
2020-02-23T10:30Z	0.162	false
2020-02-23T10:15Z	0.163	false
2020-02-23T10:00Z	0.163	false
2020-02-23T09:45Z	0.163	false
2020-02-23T09:30Z	0.163	false
2020-02-23T09:15Z	0.163	false
2020-02-23T09:00Z	0.163	false
2020-02-23T08:45Z	0.163	false
2020-02-23T08:30Z	0.163	false
2020-02-23T08:15Z	0.163	false
2020-02-23T08:00Z	0.162	false
2020-02-23T07:45Z	0.162	false
2020-02-23T07:30Z	0.161	false
2020-02-23T07:15Z	0.161	false
2020-02-23T07:00Z	0.159	false
2020-02-23T06:45Z	0.159	false
2020-02-23T06:30Z	0.158	false
2020-02-23T06:15Z	0.159	false
2020-02-23T06:00Z	0.158	false
2020-02-23T05:45Z	0.159	false
2020-02-23T05:30Z	0.159	false
2020-02-23T05:15Z	0.158	false
2020-02-23T05:00Z	0.158	false
2020-02-23T04:45Z	0.158	false
2020-02-23T04:30Z	0.158	false
2020-02-23T04:15Z	0.158	false
2020-02-23T04:00Z	0.158	false
2020-02-23T03:45Z	0.157	false
2020-02-23T03:30Z	0.157	false
2020-02-23T03:15Z	0.156	false
2020-02-23T03:00Z	0.157	false
2020-02-23T02:45Z	0.157	false
2020-02-23T02:30Z	0.156	false
2020-02-23T02:15Z	0.156	false
2020-02-23T02:00Z	0.156	false
2020-02-23T01:45Z	0.156	false
2020-02-23T01:30Z	0.155	false
2020-02-23T01:15Z	0.155	false
2020-02-23T01:00Z	0.155	false
2020-02-23T00:45Z	0.156	false
2020-02-23T00:30Z	0.156	false
2020-02-23T00:15Z	0.155	false
2020-02-23T00:00Z	0.155	false
2020-02-22T23:45Z	0.155	false
2020-02-22T23:30Z	0.155	false
2020-02-22T23:15Z	0.155	false
2020-02-22T23:00Z	0.155	false
2020-02-22T22:45Z	0.155	false
2020-02-22T22:30Z	0.155	false
2020-02-22T22:15Z	0.155	false
2020-02-22T22:00Z	0.156	false
2020-02-22T21:45Z	0.155	false
2020-02-22T21:30Z	0.155	false
2020-02-22T21:15Z	0.156	false
2020-02-22T21:00Z	0.156	false
2020-02-22T20:45Z	0.156	false
2020-02-22T20:30Z	0.156	false
2020-02-22T20:15Z	0.156	false
2020-02-22T20:00Z	0.156	false
2020-02-22T19:45Z	0.156	false
2020-02-22T19:30Z	0.155	false
2020-02-22T19:15Z	0.156	false
2020-02-22T19:00Z	0.155	false
2020-02-22T18:45Z	0.155	false
2020-02-22T18:30Z	0.155	false
2020-02-22T18:15Z	0.155	false
2020-02-22T18:00Z	0.154	false
2020-02-22T17:45Z	0.155	false
2020-02-22T17:30Z	0.154	false
2020-02-22T17:15Z	0.154	false
2020-02-22T17:00Z	0.155	false
2020-02-22T16:45Z	0.154	false
2020-02-22T16:30Z	0.154	false
2020-02-22T16:15Z	0.154	false
2020-02-22T16:00Z	0.155	false
2020-02-22T15:45Z	0.155	false
2020-02-22T15:30Z	0.155	false
2020-02-22T15:15Z	0.154	false
2020-02-22T15:00Z	0.155	false
2020-02-22T14:45Z	0.154	false
2020-02-22T14:30Z	0.155	false
2020-02-22T14:15Z	0.155	false
2020-02-22T14:00Z	0.155	false
2020-02-22T13:45Z	0.155	false
2020-02-22T13:30Z	0.156	false
2020-02-22T13:15Z	0.156	false
2020-02-22T13:00Z	0.156	false
2020-02-22T12:45Z	0.157	false
2020-02-22T12:30Z	0.158	false
2020-02-22T12:15Z	0.158	false
2020-02-22T12:00Z	0.158	false
2020-02-22T11:45Z	0.158	false
2020-02-22T11:30Z	0.158	false
2020-02-22T11:15Z	0.16	false
2020-02-22T11:00Z	0.159	false
2020-02-22T10:45Z	0.159	false
2020-02-22T10:30Z	0.159	false
2020-02-22T10:15Z	0.159	false
2020-02-22T10:00Z	0.16	false
2020-02-22T09:45Z	0.16	false
2020-02-22T09:30Z	0.16	false
2020-02-22T09:15Z	0.159	false
2020-02-22T09:00Z	0.159	false
2020-02-22T08:45Z	0.16	false
2020-02-22T08:30Z	0.159	false
2020-02-22T08:15Z	0.16	false
2020-02-22T08:00Z	0.16	false
2020-02-22T07:45Z	0.161	false
2020-02-22T07:30Z	0.16	false
2020-02-22T07:15Z	0.161	false
2020-02-22T07:00Z	0.161	false
2020-02-22T06:45Z	0.162	false
2020-02-22T06:30Z	0.162	false
2020-02-22T06:15Z	0.162	false
2020-02-22T06:00Z	0.162	false
2020-02-22T05:45Z	0.163	false
2020-02-22T05:30Z	0.163	false
2020-02-22T05:15Z	0.163	false
2020-02-22T05:00Z	0.163	false
2020-02-22T04:45Z	0.162	false
2020-02-22T04:30Z	0.163	false
2020-02-22T04:15Z	0.163	false
2020-02-22T04:00Z	0.163	false
2020-02-22T03:45Z	0.162	false
2020-02-22T03:30Z	0.163	false
2020-02-22T03:15Z	0.163	false
2020-02-22T03:00Z	0.162	false
2020-02-22T02:45Z	0.163	false
2020-02-22T02:30Z	0.162	false
2020-02-22T02:15Z	0.162	false
2020-02-22T02:00Z	0.162	false
2020-02-22T01:45Z	0.163	false
2020-02-22T01:30Z	0.163	false
2020-02-22T01:15Z	0.164	false
2020-02-22T01:00Z	0.164	false
2020-02-22T00:45Z	0.163	false
2020-02-22T00:30Z	0.163	false
2020-02-22T00:15Z	0.163	false
2020-02-22T00:00Z	0.163	false
2020-02-21T23:45Z	0.164	false
2020-02-21T23:30Z	0.164	false
2020-02-21T23:15Z	0.164	false
2020-02-21T23:00Z	0.164	false
2020-02-21T22:45Z	0.164	false
2020-02-21T22:30Z	0.164	false
2020-02-21T22:15Z	0.165	false
2020-02-21T22:00Z	0.165	false
2020-02-21T21:45Z	0.166	false
2020-02-21T21:30Z	0.165	false
2020-02-21T21:15Z	0.166	false
2020-02-21T21:00Z	0.167	false
2020-02-21T20:45Z	0.166	false
2020-02-21T20:30Z	0.166	false
2020-02-21T20:15Z	0.167	false
2020-02-21T20:00Z	0.168	false
2020-02-21T19:45Z	0.168	false
2020-02-21T19:30Z	0.168	false
2020-02-21T19:15Z	0.168	false
2020-02-21T19:00Z	0.169	false
2020-02-21T18:45Z	0.17	false
2020-02-21T18:30Z	0.169	false
2020-02-21T18:15Z	0.169	false
2020-02-21T18:00Z	0.169	false
2020-02-21T17:45Z	0.168	false
2020-02-21T17:30Z	0.169	false
2020-02-21T17:15Z	0.167	false
2020-02-21T17:00Z	0.168	false
2020-02-21T16:45Z	0.167	false
2020-02-21T16:30Z	0.167	false
2020-02-21T16:15Z	0.166	false
2020-02-21T16:00Z	0.168	false
2020-02-21T15:45Z	0.167	false
2020-02-21T15:30Z	0.167	false
2020-02-21T15:15Z	0.168	false
2020-02-21T15:00Z	0.169	false
2020-02-21T14:45Z	0.169	false
2020-02-21T14:30Z	0.17	false
2020-02-21T14:15Z	0.17	false
2020-02-21T14:00Z	0.17	false
2020-02-21T13:45Z	0.168	false
2020-02-21T13:30Z	0.167	false
2020-02-21T13:15Z	0.168	false
2020-02-21T13:00Z	0.167	false
2020-02-21T12:45Z	0.168	false
2020-02-21T12:30Z	0.168	false
2020-02-21T12:15Z	0.167	false
2020-02-21T12:00Z	0.167	false
2020-02-21T11:45Z	0.167	false
2020-02-21T11:30Z	0.168	false
2020-02-21T11:15Z	0.168	false
2020-02-21T11:00Z	0.169	false
2020-02-21T10:45Z	0.169	false
2020-02-21T10:30Z	0.169	false
2020-02-21T10:15Z	0.169	false
2020-02-21T10:00Z	0.17	false
2020-02-21T09:45Z	0.17	false
2020-02-21T09:30Z	0.17	false
2020-02-21T09:15Z	0.17	false
2020-02-21T09:00Z	0.17	false
2020-02-21T08:45Z	0.171	false
2020-02-21T08:30Z	0.17	false
2020-02-21T08:15Z	0.171	false
2020-02-21T08:00Z	0.171	false
2020-02-21T07:45Z	0.172	false
2020-02-21T07:30Z	0.171	false
2020-02-21T07:15Z	0.172	false
2020-02-21T07:00Z	0.172	false
2020-02-21T06:45Z	0.172	false
2020-02-21T06:30Z	0.174	false
2020-02-21T06:15Z	0.173	false
2020-02-21T06:00Z	0.174	false
2020-02-21T05:45Z	0.174	false
2020-02-21T05:30Z	0.175	false
2020-02-21T05:15Z	0.175	false
2020-02-21T05:00Z	0.174	false
2020-02-21T04:45Z	0.174	false
2020-02-21T04:30Z	0.175	false
2020-02-21T04:15Z	0.175	false
2020-02-21T04:00Z	0.175	false
2020-02-21T03:45Z	0.176	false
2020-02-21T03:30Z	0.176	false
2020-02-21T03:15Z	0.175	false
2020-02-21T03:00Z	0.175	false
2020-02-21T02:45Z	0.175	false
2020-02-21T02:30Z	0.175	false
2020-02-21T02:15Z	0.174	false
2020-02-21T02:00Z	0.175	false
2020-02-21T01:45Z	0.174	false
2020-02-21T01:30Z	0.174	false
2020-02-21T01:15Z	0.174	false
2020-02-21T01:00Z	0.174	false
2020-02-21T00:45Z	0.173	false
2020-02-21T00:30Z	0.173	false
2020-02-21T00:15Z	0.172	false
2020-02-21T00:00Z	0.172	false
2020-02-20T23:45Z	0.171	false
2020-02-20T23:30Z	0.171	false
2020-02-20T23:15Z	0.171	false
2020-02-20T23:00Z	0.171	false
2020-02-20T22:45Z	0.171	false
2020-02-20T22:30Z	0.171	false
2020-02-20T22:15Z	0.172	false
2020-02-20T22:00Z	0.171	false
2020-02-20T21:45Z	0.171	false
2020-02-20T21:30Z	0.172	false
2020-02-20T21:15Z	0.172	false
2020-02-20T21:00Z	0.171	false
2020-02-20T20:45Z	0.171	false
2020-02-20T20:30Z	0.172	false
2020-02-20T20:15Z	0.172	false
2020-02-20T20:00Z	0.172	false
2020-02-20T19:45Z	0.172	false
2020-02-20T19:30Z	0.171	false
2020-02-20T19:15Z	0.171	false
2020-02-20T19:00Z	0.171	false
2020-02-20T18:45Z	0.17	false
2020-02-20T18:30Z	0.17	false
2020-02-20T18:15Z	0.17	false

Forecast data

Key information

• Station name: Rickmansworth (upstream)
• Station ID: 7190
• River name: River Chess
• Typical range: 0.06m to 0.30m
• Highest level on record: 0.37m on 18 May 2001
• Site datum: 47.06mAOD (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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