In 1831/32 the first solid structure appeared on the highest point of the hill: a 15½-foot (4.9 m) high tower as a category 1 triangulation mark. The Köterberg was a station in the Prussian semaphore system, which acted as a communication link between Berlin and Koblenz from 1832 to 1849. Since 1929 the Köterberghaus has stood on the summit. Two signs on the Köterberghaus give the height of the Köterberg, incorrectly, as 500 m AMSL. This error is often repeated in the advertising. Since 1971, a telecommunication tower has stood on the summit.