From 1880 to 1920, Iowa underwent extensive lake drainage as the demand for agricultural land grew. Private drainage efforts began in the 1850s and expanded, leading to the establishment of public drainage systems and laws governing drainage. This caused disputes over drained lake beds. A 1895 governor's proclamation ordered a survey finding 99 lakes covering 61,729 acres. Efforts to drain lakes were sometimes ruled unconstitutional or opposed by conservation groups wanting to preserve lakes, leading to the establishment of the State Board of Conservation in 1918 to protect remaining lakes.