What is the main use for the structure listed in walker city, iowa?
CREATE TABLE table_name_25 (main_use VARCHAR, town VARCHAR)
SELECT main_use FROM table_name_25 WHERE town = "walker city, iowa"
### Context: CREATE TABLE table_name_25 (main_use VARCHAR, town VARCHAR) ### Question: What is the main use for the structure listed in walker city, iowa? ### Answer: SELECT main_use FROM table_name_25 WHERE town = "walker city, iowa"