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_name_16 ( pick INTEGER, overall VARCHAR, position VARCHAR, college VARCHAR )

### Question ###
What is the maximum pick when WR was the position and Michigan the college, and the overall greater than 255?

### Accurate SQL ###

SELECT MAX(pick) FROM table_name_16 WHERE position = "wr" AND college = "michigan" AND overall > 255