You can find a pdf map with current access constraints as of 30 March 2017, provided by the logistics cluster of the World Food Program.
A look into their archives shows a previous version as of 28 March, so they seem to be regularly updated while need is.
One item on the map says:
Viru Bridge
Ruptura del puente por el Rio Viru.
Reparación estimada de dos semanas
29/03/2017
which means you should no longer be affected if things go somewhat by plan.
Reliefweb also links a map with the flooding situation in Lima and Sullana provided by the European commission. You can find more information by just searching the site.
Obviously your travel is far ahead so you will want to check back in a while. Also the maps show acute constraints but not necessarily how quickly infrastructure will be restored. For this it will be best practice to inquire with local sources (tour orga, hotels, tourism bureaus) a few weeks prior. Probably also itineraries on Google maps will be updated about the new situation by then.
[Added by OP (5 Apr 2017)] Peru: Heavy Rains and Floods Summary – UN Resident Coordinator Situation Report No. 05 (As of 5 April 2017)
[Added by OP (18 Apr 2017) to keep all information in one place] There is an ongoing thread at the LonelyPlanet forum about this
Credit:stackoverflow.com‘
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