 In Grand Traverse County, the mile roads are numbered from the location of the Boardman River and the ghost town of Keystone, named after being the beginning of the road numbering system and being located at an important point on the river.Fulton Street is the north–south dividing line of the city of Grand Rapids.But since Fulton Street is on a half-section line, Michigan Street is the baseline in Kent County, not Fulton Street.