Yesterday evening I saw a Nines service arrive in Derby via the bus station so presumably it went up onto the inner ring road at St. Marys Bridge then cut through the bus station and via The Morledge to Corporation Street.
Outwards from Derby (I'm guessing here) the only way I can imagine for The Nines and H1 is: From Corporation Street, round the Council House Island, back along The Morledge, possibly cut through the bus station to use the back exit, then round the spiral to Pentagon Island and down Stores Road. H1 will the be back on it's normal route, The Nines will turn left and over Mansfield Road bridge down to The Coach & Horses pub.
Trentbarton's travel alert is very vague with the information it gives considering these diversions will operate until next March. I often see elderly residents from the Chester Green area using The Nines and H1 to get home with their shopping, they won't have any service at all for many months to come.