According to lwowecki.info:
The voivodeship road from Lwówek Śląski to Bolesławiec remains impassable. Although the water has receded, barriers are still standing on the road, and the surface requires repairs.
It also reports:
A washed-out bridge along voivodeship road 364, Betleja Street, and the washed-out road just beyond Lwówek towards Bolesławiec mean that drivers are facing considerable difficulties. Detouring around the two main routes leading to the western and northern parts of the country is a major challenge.
It is not yet known when traffic will be restored there.