Original: According to the United States Census Bureau , the city has a total area of 475.1 square miles ( 1,230.5 km ² ) ; 474.9 square miles ( 1,229.9 km ² ) of it is land and 0.2 square miles ( 0.6 km ² , or 0.05 % ) of it is water .
Simplified: It has an area of 515 square miles . The Hohokam created about 135 miles ( 217 km ) of irrigation canals .