River Ray level at Grendon Underwood
Latest at 3:30pm on 4 November
- Height
 - 0.03m
 - Trend
 - Steady
 - State
 - Normal
 
Normal range 0.01m to 0.94m
How levels here could affect nearby areas
- 1.86m
 - 
          Water reaches the highest level recorded at this measuring station (3 June 2008)
 - 1.60m
 - 
          Property flooding is possible above this level
 - 0.94m
 - 
          Top of normal range. Low-lying land flooding possible above this level. One or more flood alerts may be issued.
 - 0.03m
 - 
          Latest level
 
Flooding might not happen again at the same historical levels. This may be because flood management schemes are now in place.