The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Northern Basin and Range GPS Network - CAST-Castle P.S.
Start: 26-Mar-1997
End: 24-May-2006
Davis, James, 1998, Northern Basin and Range GPS Network - CAST-Castle P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T59C6VSB

Northern Basin and Range GPS Network - CAST-Castle P.S.
Start: 26-Mar-1997
End: 14-Nov-2022
UNAVCO Community, Davis, James, 1998, Northern Basin and Range GPS Network - CAST-Castle P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T55M642D

Northern Basin and Range GPS Network - CAST-Castle P.S.
Start: 24-May-2006
End: 14-Nov-2022
UNAVCO Community, 1998, Northern Basin and Range GPS Network - CAST-Castle P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T51V5C97