Dam levels: https://www.dwa.gov.za/Hydrology/Weekly/ProvinceWeek.aspx?region=WC

Theewaterskloof: https://www.dwa.gov.za/Hydrology/Weekly/percentile.aspx?station=H6R001
Voelvlei: https://www.dwa.gov.za/Hydrology/Weekly/percentile.aspx?station=G1R001
Berg River: https://www.dwa.gov.za/Hydrology/Weekly/percentile.aspx?station=G1R004
Steenbras Upper: https://www.dwa.gov.za/Hydrology/Weekly/percentile.aspx?station=G4R007
Steenbras Lower: https://www.dwa.gov.za/Hydrology/Weekly/percentile.aspx?station=G4R001
Wemmershoek: https://www.dwa.gov.za/Hydrology/Weekly/percentile.aspx?station=G1R002

Almost real-time data (for Theewaterskloof): https://www.dwa.gov.za/Hydrology/Unverified/DetailStageFlow.aspx?Station=H6R001FW&Type=Flow&Rain=N

(Might not be normalized or corrected.)

Historical levels (for Theewaterskloof): https://www.dwa.gov.za/Hydrology/Verified/HyDataSets.aspx?Station=H6R001 (click "Primary data")