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_80057 ( "Year" real, "Road Opened" text, "Road Closed" text, "Freight Carried s Tonne" real, "Super B Capacity Reached [ citation needed ]" text, "Number of Truck Loads North" real )

### Question ###
What is the smallest amount of freight carried on the road that closed on March 31 and reached super B capacity on February 17 after 2011?

### Accurate SQL ###

SELECT MIN("Freight Carried s Tonne") FROM table_80057 WHERE "Road Closed" = 'march 31' AND "Super B Capacity Reached [ citation needed ]" = 'february 17' AND "Year" > '2011'