River level River Colne at London Colney

Latest recorded level 1.06m at 7:00pm Sunday 1 August 2021.

Levels: last 5 days and next 36 hours

Now
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Measured level
Forecast level
Property flooding possible
Low lying land may flood
Highest recorded level. Hide
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Observed data

DateTime	Value	Error
2021-08-01T18:00Z	1.06	false
2021-08-01T17:45Z	1.059	false
2021-08-01T17:30Z	1.06	false
2021-08-01T17:15Z	1.059	false
2021-08-01T17:00Z	1.058	false
2021-08-01T16:45Z	1.057	false
2021-08-01T16:30Z	1.057	false
2021-08-01T16:15Z	1.056	false
2021-08-01T16:00Z	1.057	false
2021-08-01T15:45Z	1.056	false
2021-08-01T15:30Z	1.056	false
2021-08-01T15:15Z	1.058	false
2021-08-01T15:00Z	1.06	false
2021-08-01T14:45Z	1.059	false
2021-08-01T14:30Z	1.06	false
2021-08-01T14:15Z	1.06	false
2021-08-01T14:00Z	1.062	false
2021-08-01T13:45Z	1.061	false
2021-08-01T13:30Z	1.059	false
2021-08-01T13:15Z	1.058	false
2021-08-01T13:00Z	1.056	false
2021-08-01T12:45Z	1.056	false
2021-08-01T12:30Z	1.058	false
2021-08-01T12:15Z	1.058	false
2021-08-01T12:00Z	1.056	false
2021-08-01T11:45Z	1.056	false
2021-08-01T11:30Z	1.057	false
2021-08-01T11:15Z	1.058	false
2021-08-01T11:00Z	1.059	false
2021-08-01T10:45Z	1.058	false
2021-08-01T10:30Z	1.058	false
2021-08-01T10:15Z	1.059	false
2021-08-01T10:00Z	1.061	false
2021-08-01T09:45Z	1.063	false
2021-08-01T09:30Z	1.063	false
2021-08-01T09:15Z	1.063	false
2021-08-01T09:00Z	1.062	false
2021-08-01T08:45Z	1.063	false
2021-08-01T08:30Z	1.063	false
2021-08-01T08:15Z	1.063	false
2021-08-01T08:00Z	1.063	false
2021-08-01T07:45Z	1.064	false
2021-08-01T07:30Z	1.064	false
2021-08-01T07:15Z	1.064	false
2021-08-01T07:00Z	1.064	false
2021-08-01T06:45Z	1.065	false
2021-08-01T06:30Z	1.065	false
2021-08-01T06:15Z	1.065	false
2021-08-01T06:00Z	1.065	false
2021-08-01T05:45Z	1.065	false
2021-08-01T05:30Z	1.065	false
2021-08-01T05:15Z	1.065	false
2021-08-01T05:00Z	1.065	false
2021-08-01T04:45Z	1.065	false
2021-08-01T04:30Z	1.065	false
2021-08-01T04:15Z	1.065	false
2021-08-01T04:00Z	1.065	false
2021-08-01T03:45Z	1.065	false
2021-08-01T03:30Z	1.065	false
2021-08-01T03:15Z	1.064	false
2021-08-01T03:00Z	1.064	false
2021-08-01T02:45Z	1.064	false
2021-08-01T02:30Z	1.064	false
2021-08-01T02:15Z	1.064	false
2021-08-01T02:00Z	1.063	false
2021-08-01T01:45Z	1.063	false
2021-08-01T01:30Z	1.064	false
2021-08-01T01:15Z	1.063	false
2021-08-01T01:00Z	1.064	false
2021-08-01T00:45Z	1.064	false
2021-08-01T00:30Z	1.064	false
2021-08-01T00:15Z	1.064	false
2021-08-01T00:00Z	1.064	false
2021-07-31T23:45Z	1.064	false
2021-07-31T23:30Z	1.063	false
2021-07-31T23:15Z	1.064	false
2021-07-31T23:00Z	1.064	false
2021-07-31T22:45Z	1.064	false
2021-07-31T22:30Z	1.064	false
2021-07-31T22:15Z	1.065	false
2021-07-31T22:00Z	1.064	false
2021-07-31T21:45Z	1.065	false
2021-07-31T21:30Z	1.065	false
2021-07-31T21:15Z	1.065	false
2021-07-31T21:00Z	1.065	false
2021-07-31T20:45Z	1.065	false
2021-07-31T20:30Z	1.065	false
2021-07-31T20:15Z	1.066	false
2021-07-31T20:00Z	1.066	false
2021-07-31T19:45Z	1.066	false
2021-07-31T19:30Z	1.066	false
2021-07-31T19:15Z	1.066	false
2021-07-31T19:00Z	1.065	false
2021-07-31T18:45Z	1.066	false
2021-07-31T18:30Z	1.066	false
2021-07-31T18:15Z	1.067	false
2021-07-31T18:00Z	1.067	false
2021-07-31T17:45Z	1.066	false
2021-07-31T17:30Z	1.067	false
2021-07-31T17:15Z	1.067	false
2021-07-31T17:00Z	1.067	false
2021-07-31T16:45Z	1.067	false
2021-07-31T16:30Z	1.066	false
2021-07-31T16:15Z	1.066	false
2021-07-31T16:00Z	1.067	false
2021-07-31T15:45Z	1.067	false
2021-07-31T15:30Z	1.069	false
2021-07-31T15:15Z	1.069	false
2021-07-31T15:00Z	1.068	false
2021-07-31T14:45Z	1.068	false
2021-07-31T14:30Z	1.07	false
2021-07-31T14:15Z	1.07	false
2021-07-31T14:00Z	1.07	false
2021-07-31T13:45Z	1.071	false
2021-07-31T13:30Z	1.071	false
2021-07-31T13:15Z	1.073	false
2021-07-31T13:00Z	1.073	false
2021-07-31T12:45Z	1.073	false
2021-07-31T12:30Z	1.068	false
2021-07-31T12:15Z	1.072	false
2021-07-31T12:00Z	1.073	false
2021-07-31T11:45Z	1.073	false
2021-07-31T11:30Z	1.074	false
2021-07-31T11:15Z	1.074	false
2021-07-31T11:00Z	1.074	false
2021-07-31T10:45Z	1.075	false
2021-07-31T10:30Z	1.075	false
2021-07-31T10:15Z	1.076	false
2021-07-31T10:00Z	1.077	false
2021-07-31T09:45Z	1.077	false
2021-07-31T09:30Z	1.077	false
2021-07-31T09:15Z	1.078	false
2021-07-31T09:00Z	1.079	false
2021-07-31T08:45Z	1.079	false
2021-07-31T08:30Z	1.079	false
2021-07-31T08:15Z	1.08	false
2021-07-31T08:00Z	1.08	false
2021-07-31T07:45Z	1.08	false
2021-07-31T07:30Z	1.081	false
2021-07-31T07:15Z	1.081	false
2021-07-31T07:00Z	1.081	false
2021-07-31T06:45Z	1.082	false
2021-07-31T06:30Z	1.082	false
2021-07-31T06:15Z	1.082	false
2021-07-31T06:00Z	1.083	false
2021-07-31T05:45Z	1.083	false
2021-07-31T05:30Z	1.083	false
2021-07-31T05:15Z	1.084	false
2021-07-31T05:00Z	1.083	false
2021-07-31T04:45Z	1.084	false
2021-07-31T04:30Z	1.084	false
2021-07-31T04:15Z	1.085	false
2021-07-31T04:00Z	1.084	false
2021-07-31T03:45Z	1.084	false
2021-07-31T03:30Z	1.083	false
2021-07-31T03:15Z	1.083	false
2021-07-31T03:00Z	1.083	false
2021-07-31T02:45Z	1.082	false
2021-07-31T02:30Z	1.081	false
2021-07-31T02:15Z	1.079	false
2021-07-31T02:00Z	1.078	false
2021-07-31T01:45Z	1.078	false
2021-07-31T01:30Z	1.077	false
2021-07-31T01:15Z	1.076	false
2021-07-31T01:00Z	1.074	false
2021-07-31T00:45Z	1.073	false
2021-07-31T00:30Z	1.071	false
2021-07-31T00:15Z	1.07	false
2021-07-31T00:00Z	1.068	false
2021-07-30T23:45Z	1.068	false
2021-07-30T23:30Z	1.067	false
2021-07-30T23:15Z	1.066	false
2021-07-30T23:00Z	1.066	false
2021-07-30T22:45Z	1.065	false
2021-07-30T22:30Z	1.064	false
2021-07-30T22:15Z	1.064	false
2021-07-30T22:00Z	1.064	false
2021-07-30T21:45Z	1.064	false
2021-07-30T21:30Z	1.064	false
2021-07-30T21:15Z	1.065	false
2021-07-30T21:00Z	1.064	false
2021-07-30T20:45Z	1.066	false
2021-07-30T20:30Z	1.067	false
2021-07-30T20:15Z	1.066	false
2021-07-30T20:00Z	1.067	false
2021-07-30T19:45Z	1.067	false
2021-07-30T19:30Z	1.066	false
2021-07-30T19:15Z	1.066	false
2021-07-30T19:00Z	1.066	false
2021-07-30T18:45Z	1.066	false
2021-07-30T18:30Z	1.068	false
2021-07-30T18:15Z	1.069	false
2021-07-30T18:00Z	1.07	false
2021-07-30T17:45Z	1.068	false
2021-07-30T17:30Z	1.067	false
2021-07-30T17:15Z	1.066	false
2021-07-30T17:00Z	1.066	false
2021-07-30T16:45Z	1.066	false
2021-07-30T16:30Z	1.066	false
2021-07-30T16:15Z	1.064	false
2021-07-30T16:00Z	1.063	false
2021-07-30T15:45Z	1.062	false
2021-07-30T15:30Z	1.061	false
2021-07-30T15:15Z	1.061	false
2021-07-30T15:00Z	1.061	false
2021-07-30T14:45Z	1.059	false
2021-07-30T14:30Z	1.056	false
2021-07-30T14:15Z	1.053	false
2021-07-30T14:00Z	1.046	false
2021-07-30T13:45Z	1.042	false
2021-07-30T13:30Z	1.039	false
2021-07-30T13:15Z	1.041	false
2021-07-30T13:00Z	1.04	false
2021-07-30T12:45Z	1.038	false
2021-07-30T12:30Z	1.037	false
2021-07-30T12:15Z	1.037	false
2021-07-30T12:00Z	1.039	false
2021-07-30T11:45Z	1.033	false
2021-07-30T11:30Z	1.03	false
2021-07-30T11:15Z	1.034	false
2021-07-30T11:00Z	1.035	false
2021-07-30T10:45Z	1.036	false
2021-07-30T10:30Z	1.036	false
2021-07-30T10:15Z	1.036	false
2021-07-30T10:00Z	1.035	false
2021-07-30T09:45Z	1.034	false
2021-07-30T09:30Z	1.037	false
2021-07-30T09:15Z	1.037	false
2021-07-30T09:00Z	1.038	false
2021-07-30T08:45Z	1.038	false
2021-07-30T08:30Z	1.038	false
2021-07-30T08:15Z	1.039	false
2021-07-30T08:00Z	1.04	false
2021-07-30T07:45Z	1.041	false
2021-07-30T07:30Z	1.041	false
2021-07-30T07:15Z	1.043	false
2021-07-30T07:00Z	1.043	false
2021-07-30T06:45Z	1.045	false
2021-07-30T06:30Z	1.045	false
2021-07-30T06:15Z	1.043	false
2021-07-30T06:00Z	1.042	false
2021-07-30T05:45Z	1.041	false
2021-07-30T05:30Z	1.04	false
2021-07-30T05:15Z	1.042	false
2021-07-30T05:00Z	1.041	false
2021-07-30T04:45Z	1.04	false
2021-07-30T04:30Z	1.04	false
2021-07-30T04:15Z	1.04	false
2021-07-30T04:00Z	1.04	false
2021-07-30T03:45Z	1.039	false
2021-07-30T03:30Z	1.038	false
2021-07-30T03:15Z	1.04	false
2021-07-30T03:00Z	1.04	false
2021-07-30T02:45Z	1.039	false
2021-07-30T02:30Z	1.04	false
2021-07-30T02:15Z	1.041	false
2021-07-30T02:00Z	1.041	false
2021-07-30T01:45Z	1.042	false
2021-07-30T01:30Z	1.042	false
2021-07-30T01:15Z	1.044	false
2021-07-30T01:00Z	1.041	false
2021-07-30T00:45Z	1.041	false
2021-07-30T00:30Z	1.041	false
2021-07-30T00:15Z	1.042	false
2021-07-30T00:00Z	1.042	false
2021-07-29T23:45Z	1.043	false
2021-07-29T23:30Z	1.044	false
2021-07-29T23:15Z	1.045	false
2021-07-29T23:00Z	1.046	false
2021-07-29T22:45Z	1.047	false
2021-07-29T22:30Z	1.048	false
2021-07-29T22:15Z	1.048	false
2021-07-29T22:00Z	1.049	false
2021-07-29T21:45Z	1.05	false
2021-07-29T21:30Z	1.05	false
2021-07-29T21:15Z	1.05	false
2021-07-29T21:00Z	1.05	false
2021-07-29T20:45Z	1.05	false
2021-07-29T20:30Z	1.05	false
2021-07-29T20:15Z	1.051	false
2021-07-29T20:00Z	1.051	false
2021-07-29T19:45Z	1.051	false
2021-07-29T19:30Z	1.051	false
2021-07-29T19:15Z	1.05	false
2021-07-29T19:00Z	1.05	false
2021-07-29T18:45Z	1.048	false
2021-07-29T18:30Z	1.048	false
2021-07-29T18:15Z	1.047	false
2021-07-29T18:00Z	1.047	false
2021-07-29T17:45Z	1.047	false
2021-07-29T17:30Z	1.046	false
2021-07-29T17:15Z	1.047	false
2021-07-29T17:00Z	1.046	false
2021-07-29T16:45Z	1.046	false
2021-07-29T16:30Z	1.046	false
2021-07-29T16:15Z	1.047	false
2021-07-29T16:00Z	1.047	false
2021-07-29T15:45Z	1.046	false
2021-07-29T15:30Z	1.048	false
2021-07-29T15:15Z	1.049	false
2021-07-29T15:00Z	1.05	false
2021-07-29T14:45Z	1.05	false
2021-07-29T14:30Z	1.05	false
2021-07-29T14:15Z	1.05	false
2021-07-29T14:00Z	1.051	false
2021-07-29T13:45Z	1.054	false
2021-07-29T13:30Z	1.053	false
2021-07-29T13:15Z	1.053	false
2021-07-29T13:00Z	1.056	false
2021-07-29T12:45Z	1.054	false
2021-07-29T12:30Z	1.052	false
2021-07-29T12:15Z	1.057	false
2021-07-29T12:00Z	1.058	false
2021-07-29T11:45Z	1.059	false
2021-07-29T11:30Z	1.059	false
2021-07-29T11:15Z	1.06	false
2021-07-29T11:00Z	1.06	false
2021-07-29T10:45Z	1.06	false
2021-07-29T10:30Z	1.059	false
2021-07-29T10:15Z	1.06	false
2021-07-29T10:00Z	1.061	false
2021-07-29T09:45Z	1.06	false
2021-07-29T09:30Z	1.06	false
2021-07-29T09:15Z	1.061	false
2021-07-29T09:00Z	1.061	false
2021-07-29T08:45Z	1.061	false
2021-07-29T08:30Z	1.062	false
2021-07-29T08:15Z	1.061	false
2021-07-29T08:00Z	1.061	false
2021-07-29T07:45Z	1.062	false
2021-07-29T07:30Z	1.062	false
2021-07-29T07:15Z	1.062	false
2021-07-29T07:00Z	1.062	false
2021-07-29T06:45Z	1.06	false
2021-07-29T06:30Z	1.061	false
2021-07-29T06:15Z	1.06	false
2021-07-29T06:00Z	1.061	false
2021-07-29T05:45Z	1.061	false
2021-07-29T05:30Z	1.061	false
2021-07-29T05:15Z	1.059	false
2021-07-29T05:00Z	1.06	false
2021-07-29T04:45Z	1.058	false
2021-07-29T04:30Z	1.057	false
2021-07-29T04:15Z	1.058	false
2021-07-29T04:00Z	1.059	false
2021-07-29T03:45Z	1.059	false
2021-07-29T03:30Z	1.059	false
2021-07-29T03:15Z	1.058	false
2021-07-29T03:00Z	1.058	false
2021-07-29T02:45Z	1.058	false
2021-07-29T02:30Z	1.058	false
2021-07-29T02:15Z	1.059	false
2021-07-29T02:00Z	1.058	false
2021-07-29T01:45Z	1.058	false
2021-07-29T01:30Z	1.058	false
2021-07-29T01:15Z	1.058	false
2021-07-29T01:00Z	1.057	false
2021-07-29T00:45Z	1.058	false
2021-07-29T00:30Z	1.057	false
2021-07-29T00:15Z	1.058	false
2021-07-29T00:00Z	1.058	false
2021-07-28T23:45Z	1.058	false
2021-07-28T23:30Z	1.058	false
2021-07-28T23:15Z	1.057	false
2021-07-28T23:00Z	1.058	false
2021-07-28T22:45Z	1.057	false
2021-07-28T22:30Z	1.058	false
2021-07-28T22:15Z	1.058	false
2021-07-28T22:00Z	1.059	false
2021-07-28T21:45Z	1.058	false
2021-07-28T21:30Z	1.058	false
2021-07-28T21:15Z	1.058	false
2021-07-28T21:00Z	1.059	false
2021-07-28T20:45Z	1.06	false
2021-07-28T20:30Z	1.059	false
2021-07-28T20:15Z	1.06	false
2021-07-28T20:00Z	1.061	false
2021-07-28T19:45Z	1.061	false
2021-07-28T19:30Z	1.06	false
2021-07-28T19:15Z	1.059	false
2021-07-28T19:00Z	1.06	false
2021-07-28T18:45Z	1.06	false
2021-07-28T18:30Z	1.06	false
2021-07-28T18:15Z	1.059	false
2021-07-28T18:00Z	1.059	false
2021-07-28T17:45Z	1.058	false
2021-07-28T17:30Z	1.058	false
2021-07-28T17:15Z	1.056	false
2021-07-28T17:00Z	1.057	false
2021-07-28T16:45Z	1.054	false
2021-07-28T16:30Z	1.056	false
2021-07-28T16:15Z	1.059	false
2021-07-28T16:00Z	1.059	false
2021-07-28T15:45Z	1.058	false
2021-07-28T15:30Z	1.058	false
2021-07-28T15:15Z	1.057	false
2021-07-28T15:00Z	1.057	false
2021-07-28T14:45Z	1.056	false
2021-07-28T14:30Z	1.056	false
2021-07-28T14:15Z	1.058	false
2021-07-28T14:00Z	1.057	false
2021-07-28T13:45Z	1.055	false
2021-07-28T13:30Z	1.057	false
2021-07-28T13:15Z	1.059	false
2021-07-28T13:00Z	1.062	false
2021-07-28T12:45Z	1.059	false
2021-07-28T12:30Z	1.061	false
2021-07-28T12:15Z	1.058	false
2021-07-28T12:00Z	1.057	false
2021-07-28T11:45Z	1.058	false
2021-07-28T11:30Z	1.058	false
2021-07-28T11:15Z	1.06	false
2021-07-28T11:00Z	1.059	false
2021-07-28T10:45Z	1.06	false
2021-07-28T10:30Z	1.06	false
2021-07-28T10:15Z	1.059	false
2021-07-28T10:00Z	1.06	false
2021-07-28T09:45Z	1.061	false
2021-07-28T09:30Z	1.061	false
2021-07-28T09:15Z	1.061	false
2021-07-28T09:00Z	1.061	false
2021-07-28T08:45Z	1.06	false
2021-07-28T08:30Z	1.061	false
2021-07-28T08:15Z	1.061	false
2021-07-28T08:00Z	1.062	false
2021-07-28T07:45Z	1.061	false
2021-07-28T07:30Z	1.061	false
2021-07-28T07:15Z	1.061	false
2021-07-28T07:00Z	1.061	false
2021-07-28T06:45Z	1.061	false
2021-07-28T06:30Z	1.061	false
2021-07-28T06:15Z	1.061	false
2021-07-28T06:00Z	1.061	false
2021-07-28T05:45Z	1.061	false
2021-07-28T05:30Z	1.061	false
2021-07-28T05:15Z	1.061	false
2021-07-28T05:00Z	1.061	false
2021-07-28T04:45Z	1.061	false
2021-07-28T04:30Z	1.06	false
2021-07-28T04:15Z	1.059	false
2021-07-28T04:00Z	1.06	false
2021-07-28T03:45Z	1.061	false
2021-07-28T03:30Z	1.06	false
2021-07-28T03:15Z	1.059	false
2021-07-28T03:00Z	1.059	false
2021-07-28T02:45Z	1.058	false
2021-07-28T02:30Z	1.058	false
2021-07-28T02:15Z	1.059	false
2021-07-28T02:00Z	1.059	false
2021-07-28T01:45Z	1.058	false
2021-07-28T01:30Z	1.057	false
2021-07-28T01:15Z	1.055	false
2021-07-28T01:00Z	1.056	false
2021-07-28T00:45Z	1.056	false
2021-07-28T00:30Z	1.057	false
2021-07-28T00:15Z	1.057	false
2021-07-28T00:00Z	1.057	false
2021-07-27T23:45Z	1.057	false
2021-07-27T23:30Z	1.058	false
2021-07-27T23:15Z	1.058	false
2021-07-27T23:00Z	1.058	false
2021-07-27T22:45Z	1.058	false
2021-07-27T22:30Z	1.058	false
2021-07-27T22:15Z	1.059	false
2021-07-27T22:00Z	1.059	false
2021-07-27T21:45Z	1.06	false
2021-07-27T21:30Z	1.06	false
2021-07-27T21:15Z	1.06	false
2021-07-27T21:00Z	1.061	false
2021-07-27T20:45Z	1.061	false
2021-07-27T20:30Z	1.062	false
2021-07-27T20:15Z	1.061	false
2021-07-27T20:00Z	1.061	false
2021-07-27T19:45Z	1.061	false
2021-07-27T19:30Z	1.061	false
2021-07-27T19:15Z	1.06	false
2021-07-27T19:00Z	1.059	false
2021-07-27T18:45Z	1.058	false
2021-07-27T18:30Z	1.056	false
2021-07-27T18:15Z	1.055	false

Forecast data

August 1st 2021, 9:00:00 pm	1.064
August 1st 2021, 9:15:00 pm	1.064
August 1st 2021, 9:30:00 pm	1.065
August 1st 2021, 9:45:00 pm	1.065
August 1st 2021, 10:00:00 pm	1.065
August 1st 2021, 10:15:00 pm	1.065
August 1st 2021, 10:30:00 pm	1.065
August 1st 2021, 10:45:00 pm	1.065
August 1st 2021, 11:00:00 pm	1.065
August 1st 2021, 11:15:00 pm	1.065
August 1st 2021, 11:30:00 pm	1.065
August 1st 2021, 11:45:00 pm	1.065
August 2nd 2021, 12:00:00 am	1.065
August 2nd 2021, 12:15:00 am	1.065
August 2nd 2021, 12:30:00 am	1.066
August 2nd 2021, 12:45:00 am	1.066
August 2nd 2021, 1:00:00 am	1.066
August 2nd 2021, 1:15:00 am	1.066
August 2nd 2021, 1:30:00 am	1.066
August 2nd 2021, 1:45:00 am	1.066
August 2nd 2021, 2:00:00 am	1.066
August 2nd 2021, 2:15:00 am	1.066
August 2nd 2021, 2:30:00 am	1.066
August 2nd 2021, 2:45:00 am	1.066
August 2nd 2021, 3:00:00 am	1.066
August 2nd 2021, 3:15:00 am	1.066
August 2nd 2021, 3:30:00 am	1.066
August 2nd 2021, 3:45:00 am	1.066
August 2nd 2021, 4:00:00 am	1.066
August 2nd 2021, 4:15:00 am	1.066
August 2nd 2021, 4:30:00 am	1.066
August 2nd 2021, 4:45:00 am	1.066
August 2nd 2021, 5:00:00 am	1.066
August 2nd 2021, 5:15:00 am	1.066
August 2nd 2021, 5:30:00 am	1.066
August 2nd 2021, 5:45:00 am	1.066
August 2nd 2021, 6:00:00 am	1.066
August 2nd 2021, 6:15:00 am	1.066
August 2nd 2021, 6:30:00 am	1.066
August 2nd 2021, 6:45:00 am	1.066
August 2nd 2021, 7:00:00 am	1.066
August 2nd 2021, 7:15:00 am	1.066
August 2nd 2021, 7:30:00 am	1.066
August 2nd 2021, 7:45:00 am	1.066
August 2nd 2021, 8:00:00 am	1.066
August 2nd 2021, 8:15:00 am	1.066
August 2nd 2021, 8:30:00 am	1.066
August 2nd 2021, 8:45:00 am	1.066
August 2nd 2021, 9:00:00 am	1.066
August 2nd 2021, 9:15:00 am	1.066
August 2nd 2021, 9:30:00 am	1.066
August 2nd 2021, 9:45:00 am	1.066
August 2nd 2021, 10:00:00 am	1.066
August 2nd 2021, 10:15:00 am	1.066
August 2nd 2021, 10:30:00 am	1.066
August 2nd 2021, 10:45:00 am	1.066
August 2nd 2021, 11:00:00 am	1.066
August 2nd 2021, 11:15:00 am	1.066
August 2nd 2021, 11:30:00 am	1.066
August 2nd 2021, 11:45:00 am	1.066
August 2nd 2021, 12:00:00 pm	1.066
August 2nd 2021, 12:15:00 pm	1.066
August 2nd 2021, 12:30:00 pm	1.066
August 2nd 2021, 12:45:00 pm	1.066
August 2nd 2021, 1:00:00 pm	1.066
August 2nd 2021, 1:15:00 pm	1.066
August 2nd 2021, 1:30:00 pm	1.066
August 2nd 2021, 1:45:00 pm	1.066
August 2nd 2021, 2:00:00 pm	1.066
August 2nd 2021, 2:15:00 pm	1.066
August 2nd 2021, 2:30:00 pm	1.066
August 2nd 2021, 2:45:00 pm	1.066
August 2nd 2021, 3:00:00 pm	1.066
August 2nd 2021, 3:15:00 pm	1.066
August 2nd 2021, 3:30:00 pm	1.066
August 2nd 2021, 3:45:00 pm	1.066
August 2nd 2021, 4:00:00 pm	1.066
August 2nd 2021, 4:15:00 pm	1.066
August 2nd 2021, 4:30:00 pm	1.066
August 2nd 2021, 4:45:00 pm	1.066
August 2nd 2021, 5:00:00 pm	1.066
August 2nd 2021, 5:15:00 pm	1.066
August 2nd 2021, 5:30:00 pm	1.066
August 2nd 2021, 5:45:00 pm	1.066
August 2nd 2021, 6:00:00 pm	1.066
August 2nd 2021, 6:15:00 pm	1.066
August 2nd 2021, 6:30:00 pm	1.066
August 2nd 2021, 6:45:00 pm	1.066
August 2nd 2021, 7:00:00 pm	1.066
August 2nd 2021, 7:15:00 pm	1.066
August 2nd 2021, 7:30:00 pm	1.066
August 2nd 2021, 7:45:00 pm	1.066
August 2nd 2021, 8:00:00 pm	1.066
August 2nd 2021, 8:15:00 pm	1.066
August 2nd 2021, 8:30:00 pm	1.066
August 2nd 2021, 8:45:00 pm	1.066
August 2nd 2021, 9:00:00 pm	1.066
August 2nd 2021, 9:15:00 pm	1.066
August 2nd 2021, 9:30:00 pm	1.066
August 2nd 2021, 9:45:00 pm	1.066
August 2nd 2021, 10:00:00 pm	1.066
August 2nd 2021, 10:15:00 pm	1.066
August 2nd 2021, 10:30:00 pm	1.066
August 2nd 2021, 10:45:00 pm	1.066
August 2nd 2021, 11:00:00 pm	1.066
August 2nd 2021, 11:15:00 pm	1.066
August 2nd 2021, 11:30:00 pm	1.066
August 2nd 2021, 11:45:00 pm	1.066
August 3rd 2021, 12:00:00 am	1.066
August 3rd 2021, 12:15:00 am	1.066
August 3rd 2021, 12:30:00 am	1.066
August 3rd 2021, 12:45:00 am	1.066
August 3rd 2021, 1:00:00 am	1.066
August 3rd 2021, 1:15:00 am	1.066
August 3rd 2021, 1:30:00 am	1.066
August 3rd 2021, 1:45:00 am	1.066
August 3rd 2021, 2:00:00 am	1.066
August 3rd 2021, 2:15:00 am	1.066
August 3rd 2021, 2:30:00 am	1.066
August 3rd 2021, 2:45:00 am	1.066
August 3rd 2021, 3:00:00 am	1.066
August 3rd 2021, 3:15:00 am	1.066
August 3rd 2021, 3:30:00 am	1.066
August 3rd 2021, 3:45:00 am	1.066
August 3rd 2021, 4:00:00 am	1.066
August 3rd 2021, 4:15:00 am	1.066
August 3rd 2021, 4:30:00 am	1.066
August 3rd 2021, 4:45:00 am	1.066
August 3rd 2021, 5:00:00 am	1.066
August 3rd 2021, 5:15:00 am	1.066
August 3rd 2021, 5:30:00 am	1.066
August 3rd 2021, 5:45:00 am	1.066
August 3rd 2021, 6:00:00 am	1.066
August 3rd 2021, 6:15:00 am	1.066
August 3rd 2021, 6:30:00 am	1.066
August 3rd 2021, 6:45:00 am	1.066
August 3rd 2021, 7:00:00 am	1.066

Forecasts contain uncertainty and can change frequently. For the latest information, always check for up to date flood warnings and alerts in your area.

Key information

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?

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.

How are forecasts produced?

The forecasts shown here are computer models based on technical data, local conditions and Met Office rainfall predictions and may contain uncertainty. Because they’re linked to the weather, forecasts can change quickly. We update them more frequently if the risk of flooding increases.

When we issue flood warnings and alerts we assess many factors including these forecasts, local conditions, tides and the weather forecast.

Flood warnings and alerts can still be issued even if water levels at a measuring station are forecast to remain within its typical range. For the latest information, always check for up to date flood warnings and alerts.

What effect could these levels have on nearby areas?

Typical range at this location

0.94m to 1.85m.

Above 1.85m flooding of low-lying land may occur in these areas

Upper River Colne and Radlett Brook

Above 2.30m some property flooding may occur in these areas

River Colne at London Colney

Highest forecast level at this location

The highest level forecast in the next 36 hours is 1.07m at 12:30am Monday 2 August 2021.

Highest level recorded at this location

2.72m on 30 October 2000

View nearby measuring stations