The River Test really should be considered multiple rivers because it splits and rejoins as it moves across the Hampshire countryside.  You can cross all sorts of minor streams, but you do also get some larger crossings where the river is well defined.  One of these is the road to Longstock.  There is a weir across the river just upstream of the bridge and it seemed to be flowing pretty well when we were there.  We had experienced lovely weather, but I guess quite a bit of rain had preceded our arrival.  There was a single swan on the river, and it seemed to be making some effort to move upstream.