Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Dam constructed', 'Year completed', 'Impounded body of water', 'Reservoir capacity', 'Dam wall height', 'Dam type']

### Response:
SELECT MIN Year completed FROM table WHERE Dam type = concrete gravity AND Impounded body of water = deep creek reservoir