I can't delete the first post about the Deshka X-Over, so I am trying to correction the information I posted yesterday.
After additional information it turns out the Deshka X-Over is still good coming off of the Susitna on the south end of the overland trail. Bill from Willow Trails Committee just groomed it on Monday. The area where the open lead makes the Su Valley Winter Trail impassable is actually where the trail exits the swamp heading north back onto the Su into Susitna Landing. This is approximately 21 miles from DLOA. The lead presents a problem because it is not a very easy place to get around due to the high bank.