River level River Thames at Marlow Lock (downstream data)

Check for flood warnings in this area

Latest recorded level 2.09m at 12:00pm Friday 18 September 2020.

View upstream 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 3.23m 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
2020-09-18T11:00Z	2.088	false
2020-09-18T10:45Z	2.069	false
2020-09-18T10:30Z	2.08	false
2020-09-18T10:15Z	2.08	false
2020-09-18T10:00Z	2.09	false
2020-09-18T09:45Z	2.074	false
2020-09-18T09:30Z	2.091	false
2020-09-18T09:15Z	2.106	false
2020-09-18T09:00Z	2.081	false
2020-09-18T08:45Z	2.105	false
2020-09-18T08:30Z	2.087	false
2020-09-18T08:15Z	2.088	false
2020-09-18T08:00Z	2.086	false
2020-09-18T07:45Z	2.079	false
2020-09-18T07:30Z	2.117	false
2020-09-18T07:15Z	2.084	false
2020-09-18T07:00Z	2.086	false
2020-09-18T06:45Z	2.084	false
2020-09-18T06:30Z	2.082	false
2020-09-18T06:15Z	2.083	false
2020-09-18T06:00Z	2.084	false
2020-09-18T05:45Z	2.083	false
2020-09-18T05:30Z	2.084	false
2020-09-18T05:15Z	2.084	false
2020-09-18T05:00Z	2.084	false
2020-09-18T04:45Z	2.083	false
2020-09-18T04:30Z	2.085	false
2020-09-18T04:15Z	2.085	false
2020-09-18T04:00Z	2.085	false
2020-09-18T03:45Z	2.085	false
2020-09-18T03:30Z	2.084	false
2020-09-18T03:15Z	2.084	false
2020-09-18T03:00Z	2.085	false
2020-09-18T02:45Z	2.085	false
2020-09-18T02:30Z	2.085	false
2020-09-18T02:15Z	2.083	false
2020-09-18T02:00Z	2.084	false
2020-09-18T01:45Z	2.084	false
2020-09-18T01:30Z	2.084	false
2020-09-18T01:15Z	2.084	false
2020-09-18T01:00Z	2.085	false
2020-09-18T00:45Z	2.083	false
2020-09-18T00:30Z	2.083	false
2020-09-18T00:15Z	2.084	false
2020-09-18T00:00Z	2.083	false
2020-09-17T23:45Z	2.083	false
2020-09-17T23:30Z	2.081	false
2020-09-17T23:15Z	2.081	false
2020-09-17T23:00Z	2.083	false
2020-09-17T22:45Z	2.082	false
2020-09-17T22:30Z	2.082	false
2020-09-17T22:15Z	2.081	false
2020-09-17T22:00Z	2.081	false
2020-09-17T21:45Z	2.081	false
2020-09-17T21:30Z	2.082	false
2020-09-17T21:15Z	2.079	false
2020-09-17T21:00Z	2.08	false
2020-09-17T20:45Z	2.08	false
2020-09-17T20:30Z	2.079	false
2020-09-17T20:15Z	2.081	false
2020-09-17T20:00Z	2.08	false
2020-09-17T19:45Z	2.078	false
2020-09-17T19:30Z	2.077	false
2020-09-17T19:15Z	2.078	false
2020-09-17T19:00Z	2.075	false
2020-09-17T18:45Z	2.084	false
2020-09-17T18:30Z	2.098	false
2020-09-17T18:15Z	2.078	false
2020-09-17T18:00Z	2.075	false
2020-09-17T17:45Z	2.085	false
2020-09-17T17:30Z	2.082	false
2020-09-17T17:15Z	2.059	false
2020-09-17T17:00Z	2.065	false
2020-09-17T16:45Z	2.111	false
2020-09-17T16:30Z	2.075	false
2020-09-17T16:15Z	2.074	false
2020-09-17T16:00Z	2.069	false
2020-09-17T15:45Z	2.09	false
2020-09-17T15:30Z	2.058	false
2020-09-17T15:15Z	2.087	false
2020-09-17T15:00Z	2.071	false
2020-09-17T14:45Z	2.066	false
2020-09-17T14:30Z	2.051	false
2020-09-17T14:15Z	2.065	false
2020-09-17T14:00Z	2.134	false
2020-09-17T13:45Z	2.067	false
2020-09-17T13:30Z	2.081	false
2020-09-17T13:15Z	2.106	false
2020-09-17T13:00Z	2.069	false
2020-09-17T12:45Z	2.077	false
2020-09-17T12:30Z	2.077	false
2020-09-17T12:15Z	2.06	false
2020-09-17T12:00Z	2.077	false
2020-09-17T11:45Z	2.076	false
2020-09-17T11:30Z	2.059	false
2020-09-17T11:15Z	2.118	false
2020-09-17T11:00Z	2.054	false
2020-09-17T10:45Z	2.093	false
2020-09-17T10:30Z	2.059	false
2020-09-17T10:15Z	2.084	false
2020-09-17T10:00Z	2.084	false
2020-09-17T09:45Z	2.086	false
2020-09-17T09:30Z	2.078	false
2020-09-17T09:15Z	2.037	false
2020-09-17T09:00Z	2.072	false
2020-09-17T08:45Z	2.087	false
2020-09-17T08:30Z	2.056	false
2020-09-17T08:15Z	2.077	false
2020-09-17T08:00Z	2.063	false
2020-09-17T07:45Z	2.08	false
2020-09-17T07:30Z	2.074	false
2020-09-17T07:15Z	2.063	false
2020-09-17T07:00Z	2.078	false
2020-09-17T06:45Z	2.071	false
2020-09-17T06:30Z	2.072	false
2020-09-17T06:15Z	2.071	false
2020-09-17T06:00Z	2.072	false
2020-09-17T05:45Z	2.072	false
2020-09-17T05:30Z	2.073	false
2020-09-17T05:15Z	2.073	false
2020-09-17T05:00Z	2.074	false
2020-09-17T04:45Z	2.074	false
2020-09-17T04:30Z	2.076	false
2020-09-17T04:15Z	2.076	false
2020-09-17T04:00Z	2.077	false
2020-09-17T03:45Z	2.077	false
2020-09-17T03:30Z	2.077	false
2020-09-17T03:15Z	2.077	false
2020-09-17T03:00Z	2.078	false
2020-09-17T02:45Z	2.082	false
2020-09-17T02:30Z	2.08	false
2020-09-17T02:15Z	2.081	false
2020-09-17T02:00Z	2.083	false
2020-09-17T01:45Z	2.08	false
2020-09-17T01:30Z	2.083	false
2020-09-17T01:15Z	2.085	false
2020-09-17T01:00Z	2.089	false
2020-09-17T00:45Z	2.087	false
2020-09-17T00:30Z	2.088	false
2020-09-17T00:15Z	2.09	false
2020-09-17T00:00Z	2.091	false
2020-09-16T23:45Z	2.091	false
2020-09-16T23:30Z	2.093	false
2020-09-16T23:15Z	2.091	false
2020-09-16T23:00Z	2.092	false
2020-09-16T22:45Z	2.094	false
2020-09-16T22:30Z	2.093	false
2020-09-16T22:15Z	2.097	false
2020-09-16T22:00Z	2.096	false
2020-09-16T21:45Z	2.098	false
2020-09-16T21:30Z	2.101	false
2020-09-16T21:15Z	2.097	false
2020-09-16T21:00Z	2.1	false
2020-09-16T20:45Z	2.1	false
2020-09-16T20:30Z	2.099	false
2020-09-16T20:15Z	2.101	false
2020-09-16T20:00Z	2.097	false
2020-09-16T19:45Z	2.103	false
2020-09-16T19:30Z	2.096	false
2020-09-16T19:15Z	2.101	false
2020-09-16T19:00Z	2.095	false
2020-09-16T18:45Z	2.095	false
2020-09-16T18:30Z	2.091	false
2020-09-16T18:15Z	2.091	false
2020-09-16T18:00Z	2.09	false
2020-09-16T17:45Z	2.102	false
2020-09-16T17:30Z	2.088	false
2020-09-16T17:15Z	2.055	false
2020-09-16T17:00Z	2.104	false
2020-09-16T16:45Z	2.08	false
2020-09-16T16:30Z	2.098	false
2020-09-16T16:15Z	2.105	false
2020-09-16T16:00Z	2.113	false
2020-09-16T15:45Z	2.094	false
2020-09-16T15:30Z	2.116	false
2020-09-16T15:15Z	2.137	false
2020-09-16T15:00Z	2.075	false
2020-09-16T14:45Z	2.123	false
2020-09-16T14:30Z	2.12	false
2020-09-16T14:15Z	2.108	false
2020-09-16T14:00Z	2.149	false
2020-09-16T13:45Z	2.127	false
2020-09-16T13:30Z	2.094	false
2020-09-16T13:15Z	2.125	false
2020-09-16T13:00Z	2.105	false
2020-09-16T12:45Z	2.123	false
2020-09-16T12:30Z	2.125	false
2020-09-16T12:15Z	2.124	false
2020-09-16T12:00Z	2.124	false
2020-09-16T11:45Z	2.103	false
2020-09-16T11:30Z	2.129	false
2020-09-16T11:15Z	2.125	false
2020-09-16T11:00Z	2.119	false
2020-09-16T10:45Z	2.1	false
2020-09-16T10:30Z	2.11	false
2020-09-16T10:15Z	2.128	false
2020-09-16T10:00Z	2.104	false
2020-09-16T09:45Z	2.116	false
2020-09-16T09:30Z	2.108	false
2020-09-16T09:15Z	2.106	false
2020-09-16T09:00Z	2.11	false
2020-09-16T08:45Z	2.105	false
2020-09-16T08:30Z	2.109	false
2020-09-16T08:15Z	2.111	false
2020-09-16T08:00Z	2.111	false
2020-09-16T07:45Z	2.112	false
2020-09-16T07:30Z	2.111	false
2020-09-16T07:15Z	2.111	false
2020-09-16T07:00Z	2.112	false
2020-09-16T06:45Z	2.111	false
2020-09-16T06:30Z	2.112	false
2020-09-16T06:15Z	2.112	false
2020-09-16T06:00Z	2.112	false
2020-09-16T05:45Z	2.112	false
2020-09-16T05:30Z	2.111	false
2020-09-16T05:15Z	2.112	false
2020-09-16T05:00Z	2.113	false
2020-09-16T04:45Z	2.113	false
2020-09-16T04:30Z	2.113	false
2020-09-16T04:15Z	2.113	false
2020-09-16T04:00Z	2.114	false
2020-09-16T03:45Z	2.114	false
2020-09-16T03:30Z	2.113	false
2020-09-16T03:15Z	2.113	false
2020-09-16T03:00Z	2.113	false
2020-09-16T02:45Z	2.114	false
2020-09-16T02:30Z	2.113	false
2020-09-16T02:15Z	2.115	false
2020-09-16T02:00Z	2.114	false
2020-09-16T01:45Z	2.115	false
2020-09-16T01:30Z	2.114	false
2020-09-16T01:15Z	2.114	false
2020-09-16T01:00Z	2.115	false
2020-09-16T00:45Z	2.114	false
2020-09-16T00:30Z	2.115	false
2020-09-16T00:15Z	2.114	false
2020-09-16T00:00Z	2.115	false
2020-09-15T23:45Z	2.115	false
2020-09-15T23:30Z	2.115	false
2020-09-15T23:15Z	2.115	false
2020-09-15T23:00Z	2.114	false
2020-09-15T22:45Z	2.114	false
2020-09-15T22:30Z	2.114	false
2020-09-15T22:15Z	2.115	false
2020-09-15T22:00Z	2.115	false
2020-09-15T21:45Z	2.115	false
2020-09-15T21:30Z	2.115	false
2020-09-15T21:15Z	2.115	false
2020-09-15T21:00Z	2.114	false
2020-09-15T20:45Z	2.115	false
2020-09-15T20:30Z	2.115	false
2020-09-15T20:15Z	2.115	false
2020-09-15T20:00Z	2.115	false
2020-09-15T19:45Z	2.116	false
2020-09-15T19:30Z	2.117	false
2020-09-15T19:15Z	2.115	false
2020-09-15T19:00Z	2.116	false
2020-09-15T18:45Z	2.118	false
2020-09-15T18:30Z	2.102	false
2020-09-15T18:15Z	2.11	false
2020-09-15T18:00Z	2.072	false
2020-09-15T17:45Z	2.122	false
2020-09-15T17:30Z	2.15	false
2020-09-15T17:15Z	2.118	false
2020-09-15T17:00Z	2.096	false
2020-09-15T16:45Z	2.106	false
2020-09-15T16:30Z	2.117	false
2020-09-15T16:15Z	2.114	false
2020-09-15T16:00Z	2.121	false
2020-09-15T15:45Z	2.139	false
2020-09-15T15:30Z	2.103	false
2020-09-15T15:15Z	2.107	false
2020-09-15T15:00Z	2.11	false
2020-09-15T14:45Z	2.102	false
2020-09-15T14:30Z	2.11	false
2020-09-15T14:15Z	2.092	false
2020-09-15T14:00Z	2.1	false
2020-09-15T13:45Z	2.132	false
2020-09-15T13:30Z	2.103	false
2020-09-15T13:15Z	2.101	false
2020-09-15T13:00Z	2.122	false
2020-09-15T12:45Z	2.098	false
2020-09-15T12:30Z	2.099	false
2020-09-15T12:15Z	2.104	false
2020-09-15T12:00Z	2.103	false
2020-09-15T11:45Z	2.122	false
2020-09-15T11:30Z	2.16	false
2020-09-15T11:15Z	2.102	false
2020-09-15T11:00Z	2.097	false
2020-09-15T10:45Z	2.143	false
2020-09-15T10:30Z	2.114	false
2020-09-15T10:15Z	2.106	false
2020-09-15T10:00Z	2.068	false
2020-09-15T09:45Z	2.115	false
2020-09-15T09:30Z	2.108	false
2020-09-15T09:15Z	2.11	false
2020-09-15T09:00Z	2.065	false
2020-09-15T08:45Z	2.135	false
2020-09-15T08:30Z	2.083	false
2020-09-15T08:15Z	2.094	false
2020-09-15T08:00Z	2.107	false
2020-09-15T07:45Z	2.112	false
2020-09-15T07:30Z	2.107	false
2020-09-15T07:15Z	2.11	false
2020-09-15T07:00Z	2.107	false
2020-09-15T06:45Z	2.107	false
2020-09-15T06:30Z	2.108	false
2020-09-15T06:15Z	2.109	false
2020-09-15T06:00Z	2.109	false
2020-09-15T05:45Z	2.109	false
2020-09-15T05:30Z	2.11	false
2020-09-15T05:15Z	2.11	false
2020-09-15T05:00Z	2.11	false
2020-09-15T04:45Z	2.111	false
2020-09-15T04:30Z	2.111	false
2020-09-15T04:15Z	2.111	false
2020-09-15T04:00Z	2.112	false
2020-09-15T03:45Z	2.113	false
2020-09-15T03:30Z	2.113	false
2020-09-15T03:15Z	2.113	false
2020-09-15T03:00Z	2.113	false
2020-09-15T02:45Z	2.114	false
2020-09-15T02:30Z	2.115	false
2020-09-15T02:15Z	2.114	false
2020-09-15T02:00Z	2.115	false
2020-09-15T01:45Z	2.116	false
2020-09-15T01:30Z	2.117	false
2020-09-15T01:15Z	2.117	false
2020-09-15T01:00Z	2.117	false
2020-09-15T00:45Z	2.117	false
2020-09-15T00:30Z	2.118	false
2020-09-15T00:15Z	2.117	false
2020-09-15T00:00Z	2.118	false
2020-09-14T23:45Z	2.119	false
2020-09-14T23:30Z	2.118	false
2020-09-14T23:15Z	2.12	false
2020-09-14T23:00Z	2.121	false
2020-09-14T22:45Z	2.121	false
2020-09-14T22:30Z	2.12	false
2020-09-14T22:15Z	2.121	false
2020-09-14T22:00Z	2.121	false
2020-09-14T21:45Z	2.122	false
2020-09-14T21:30Z	2.123	false
2020-09-14T21:15Z	2.124	false
2020-09-14T21:00Z	2.124	false
2020-09-14T20:45Z	2.127	false
2020-09-14T20:30Z	2.12	false
2020-09-14T20:15Z	2.135	false
2020-09-14T20:00Z	2.121	false
2020-09-14T19:45Z	2.124	false
2020-09-14T19:30Z	2.125	false
2020-09-14T19:15Z	2.127	false
2020-09-14T19:00Z	2.124	false
2020-09-14T18:45Z	2.133	false
2020-09-14T18:30Z	2.141	false
2020-09-14T18:15Z	2.125	false
2020-09-14T18:00Z	2.143	false
2020-09-14T17:45Z	2.129	false
2020-09-14T17:30Z	2.119	false
2020-09-14T17:15Z	2.122	false
2020-09-14T17:00Z	2.118	false
2020-09-14T16:45Z	2.105	false
2020-09-14T16:30Z	2.126	false
2020-09-14T16:15Z	2.127	false
2020-09-14T16:00Z	2.128	false
2020-09-14T15:45Z	2.14	false
2020-09-14T15:30Z	2.137	false
2020-09-14T15:15Z	2.127	false
2020-09-14T15:00Z	2.149	false
2020-09-14T14:45Z	2.124	false
2020-09-14T14:30Z	2.122	false
2020-09-14T14:15Z	2.135	false
2020-09-14T14:00Z	2.127	false
2020-09-14T13:45Z	2.136	false
2020-09-14T13:30Z	2.12	false
2020-09-14T13:15Z	2.116	false
2020-09-14T13:00Z	2.11	false
2020-09-14T12:45Z	2.124	false
2020-09-14T12:30Z	2.124	false
2020-09-14T12:15Z	2.139	false
2020-09-14T12:00Z	2.117	false
2020-09-14T11:45Z	2.118	false
2020-09-14T11:30Z	2.105	false
2020-09-14T11:15Z	2.132	false
2020-09-14T11:00Z	2.101	false
2020-09-14T10:45Z	2.118	false
2020-09-14T10:30Z	2.093	false
2020-09-14T10:15Z	2.127	false
2020-09-14T10:00Z	2.102	false
2020-09-14T09:45Z	2.124	false
2020-09-14T09:30Z	2.106	false
2020-09-14T09:15Z	2.096	false
2020-09-14T09:00Z	2.106	false
2020-09-14T08:45Z	2.068	false
2020-09-14T08:30Z	2.097	false
2020-09-14T08:15Z	2.106	false
2020-09-14T08:00Z	2.108	false
2020-09-14T07:45Z	2.108	false
2020-09-14T07:30Z	2.105	false
2020-09-14T07:15Z	2.106	false
2020-09-14T07:00Z	2.106	false
2020-09-14T06:45Z	2.106	false
2020-09-14T06:30Z	2.104	false
2020-09-14T06:15Z	2.104	false
2020-09-14T06:00Z	2.105	false
2020-09-14T05:45Z	2.106	false
2020-09-14T05:30Z	2.105	false
2020-09-14T05:15Z	2.104	false
2020-09-14T05:00Z	2.105	false
2020-09-14T04:45Z	2.104	false
2020-09-14T04:30Z	2.105	false
2020-09-14T04:15Z	2.104	false
2020-09-14T04:00Z	2.104	false
2020-09-14T03:45Z	2.104	false
2020-09-14T03:30Z	2.105	false
2020-09-14T03:15Z	2.104	false
2020-09-14T03:00Z	2.104	false
2020-09-14T02:45Z	2.105	false
2020-09-14T02:30Z	2.104	false
2020-09-14T02:15Z	2.104	false
2020-09-14T02:00Z	2.105	false
2020-09-14T01:45Z	2.105	false
2020-09-14T01:30Z	2.104	false
2020-09-14T01:15Z	2.104	false
2020-09-14T01:00Z	2.104	false
2020-09-14T00:45Z	2.105	false
2020-09-14T00:30Z	2.104	false
2020-09-14T00:15Z	2.104	false
2020-09-14T00:00Z	2.104	false
2020-09-13T23:45Z	2.105	false
2020-09-13T23:30Z	2.105	false
2020-09-13T23:15Z	2.105	false
2020-09-13T23:00Z	2.105	false
2020-09-13T22:45Z	2.104	false
2020-09-13T22:30Z	2.106	false
2020-09-13T22:15Z	2.105	false
2020-09-13T22:00Z	2.105	false
2020-09-13T21:45Z	2.105	false
2020-09-13T21:30Z	2.104	false
2020-09-13T21:15Z	2.105	false
2020-09-13T21:00Z	2.105	false
2020-09-13T20:45Z	2.107	false
2020-09-13T20:30Z	2.104	false
2020-09-13T20:15Z	2.104	false
2020-09-13T20:00Z	2.104	false
2020-09-13T19:45Z	2.103	false
2020-09-13T19:30Z	2.104	false
2020-09-13T19:15Z	2.103	false
2020-09-13T19:00Z	2.102	false
2020-09-13T18:45Z	2.084	false
2020-09-13T18:30Z	2.111	false
2020-09-13T18:15Z	2.125	false
2020-09-13T18:00Z	2.088	false
2020-09-13T17:45Z	2.113	false
2020-09-13T17:30Z	2.09	false
2020-09-13T17:15Z	2.112	false
2020-09-13T17:00Z	2.102	false
2020-09-13T16:45Z	2.098	false
2020-09-13T16:30Z	2.146	false
2020-09-13T16:15Z	2.109	false
2020-09-13T16:00Z	2.111	false
2020-09-13T15:45Z	2.105	false
2020-09-13T15:30Z	2.108	false
2020-09-13T15:15Z	2.125	false
2020-09-13T15:00Z	2.109	false
2020-09-13T14:45Z	2.1	false
2020-09-13T14:30Z	2.071	false
2020-09-13T14:15Z	2.102	false
2020-09-13T14:00Z	2.113	false
2020-09-13T13:45Z	2.101	false
2020-09-13T13:30Z	2.084	false
2020-09-13T13:15Z	2.09	false
2020-09-13T13:00Z	2.084	false
2020-09-13T12:45Z	2.092	false
2020-09-13T12:30Z	2.076	false
2020-09-13T12:15Z	2.086	false
2020-09-13T12:00Z	2.107	false
2020-09-13T11:45Z	2.086	false
2020-09-13T11:30Z	2.094	false
2020-09-13T11:15Z	2.109	false

Forecast data

Key information

• Station name: Marlow Lock (downstream)
• Station ID: 7396
• River name: River Thames
• Typical range: 2.02m to 3.23m
• Highest level on record: 4.73m on 10 February 2014
• Site datum: 22.77mAOD (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.

Share this page

• Twitter
• Facebook
• Email