After several years of lobbying by the Wurtses, the Delaware and Hudson Canal Company was chartered by separate laws in the state of New York and commonwealth of Pennsylvania in 1823, allowing William Wurts and his brother Maurice to construct the Delaware and Hudson Canal. The New York law, passed April 23, 1823, incorporated "The President, Managers and Company of the Delaware and Hudson Canal Company", and the Pennsylvania law, passed March 13 of the same year, authorized the company "To Improve the Navigation of the Lackawaxen River". The company hired Benjamin Wright, who had engineered the Erie Canal, and his assistant John B. Jervis to survey and plan a route. A primary challenge was the 600-foot (183 m) elevation difference between the Delaware River at Lackawaxen and the Hudson at Rondout. Wright's initial estimated cost of $1.2 million was later revised to $1.6 million (in 1825 dollars).