The other question is do all these closures mean the path is finally getting some much-needed resurfacing? Or are they merely heading off a bridge collapse?
Allegedly(!) the path is being resurfaced. They may well be removing the tree roots which caused the awful state of the path in the first place, but I haven't been that way for a while, so I don't know what is happening down there.
The good news is that the stretch from the sun alongside the A64 has been majorly improved. Previously it was about 1.5 bikes wide and had a surface that made riding a pneumatic drill seem pleasant by comparison. It is now more than twice the previous width and has a smooooooth new tarmac surface.
Also, if you are approaching York along the cycle path from the north (NCN 65) there is a diversion across Clifton Ings, due to some work being carried out on the flood defences. The diversion is nice and wide (and also very smooth) tarmac. The diversion appears in Open Cyclemap, although it doesn't appear to be routable in RwGPS yet.
If I can find any pictures of these, I shall post them in a bit!
Edit: Found some screen grabs from my bike camera.
Clifton Ings NCN 65 diversion southern end, looking north:
Mid way along the NCN 65 diversion looking north:
North end of the NCN 65 diversion looking east - the path north is round the left-hand corner ahead, the closed path into York is off to the right:
The New! Improved! Widened! path from the Sun alongside the A64 towards the Knavesmire: