The Two Spanish Land Grants - Rancho Collayomi and Rancho Guenoc
Most of the valley land in South Lake County was usurped in the 1840s by the awarding of two Land Grants by Mexican governors, before California became a part of the United States. Together they contained about 30,000 acres. The Collayomi was granted as containing three Mexican leagues; the Guenoc six leagues. After the U.S. took control, the government revised its conversion of leagues to acres several times, varying from early conversions of 4605.5 and 4438.68 acres to 4428 acres, conveniently lopping off 4,000 to 5,000 acres included in the original boundaries.