Table: dam_data
Columns: dam_constructed
year_completed
impounded_body_of_water
reservoir_capacity
dam_wall_height
dam_type

Question: Which Year completed has a Dam type of concrete gravity, and an Impounded body of water of deep creek reservoir?
SQL: SELECT MIN("year_completed") FROM dam_data WHERE "dam_type" = 'concrete gravity' AND "impounded_body_of_water" = 'deep creek reservoir'

Question: Which dam type was completed in 1961?
SQL: SELECT "dam_type" FROM dam_data WHERE "year_completed" = 1961

Question: Which Year completed has a Dam type of earthfill embankment, and a Dam constructed of khancoban dam?
SQL: SELECT MAX("year_completed") FROM dam_data WHERE "dam_type" = 'earthfill embankment' AND "dam_constructed" = 'khancoban dam'

Question: Which Reservoir capacity has an Impounded body of water of tumut two pondage?
SQL: SELECT "reservoir_capacity" FROM dam_data WHERE "impounded_body_of_water" = 'tumut two pondage'