Monmouth Rowing Club
Because the river Wye valley at Monmouth is so narrow, the river level can rise very quickly after rain in the river catchment area between Builth Wells and Rhayader.
Checking the river level at Builth Wells and nearer at Hereford can give a good indication of the expected river level at Monmouth.
Links to the various river stations are below
This image of the river level is updated every 30 mins