From our range operator:

I just returned from Range 3.  
While the range floor is mucky, we didn’t get the rain accumulation that was expected and the water on the range floor has dissipated to the point that we can reopen for tomorrow morning.
Please let the members know that this is a day to day decision and we will do our best to monitor the range.  
Members are still responsible to make the decision to close the range due to standing water..
All the best, Bill