The forecast for further rain has prompted the transfer of the Kembla Grange race meeting to Goulburn.
Thursday's program features a heat of the Provincial Championship but Kembla is already rated heavy with more rain predicted around midday.
Goulburn has a soft rating and a more favourable forecast.
The first race has been changed from 2000 to 2100 metres but the rest remain the same.
SYDNEY, March 23 AAP