Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_62074 ( "Dam constructed" text, "Year completed" real, "Impounded body of water" text, "Reservoir capacity" text, "Dam wall height" text, "Dam type" text )

### Question ###
Which Year completed has a Dam type of concrete gravity, and an Impounded body of water of deep creek reservoir?

### Accurate SQL ###

SELECT MIN("Year completed") FROM table_62074 WHERE "Dam type" = 'concrete gravity' AND "Impounded body of water" = 'deep creek reservoir'