Even with the publication of the Commissioners' Plan, the work of gridironing Manhattan was far from done. Randel's map only showed 16 elevation points for the entirety of Manhattan island, and many more would be needed. In addition, very few of the streets were actually placed into the physical landscape of the island; 125th Street, for instance, was the northernmost street for which Randel had an actual physical position. These tasks, that of completing the survey with elevations, along with marking the actual positions of the notional streets of the plan, would take Randel another six years, until about 1817, supervised by a committee of five alderman, as the Commission had disbanded once it had discharged its legal responsibility.