In November 1787, he became "Kammerdirektor" (director of the board of war and domains) for the king's possessions west of the river Weser, and in 1796, he was appointed supreme president of all the Westphalian chambers dealing with the commerce and mines of those Prussian lands. One of the chief benefits he conferred on these districts was the canalization of the river Ruhr, which became an important outlet for the coal of that region. He also improved the navigation of the Weser and kept the main roads committed to his care well.