 It is one mile (1.6 km) long by half a mile wide (0.80 km), bounded by It is bounded by Flinders Street, Spencer Street LaTrobe Street and Spring Street.The grid's longest axis is oriented 70 degrees clockwise from true north, to align better with the course of the Yarra River.Most of the arterial streets outside the Hoddle Grid were aligned almost north–south, Melbourne, at 8 degrees clockwise from true north–noting that magnetic north was 8° 3' E in 1900, increasing to 11° 42' E in 2009.