Data shows most of the valley has experienced little to no subsidence over the past nine years, with some exceptions From the Department of Water Resources: New data released today measure changes in land subsidence in the Sacramento Valley over the past nine years, finding the greatest land surface declines near the city of Arbuckle in Colusa County. According to the Sacramento Valley GPS Subsidence Network Report and accompanying fact sheet, most of the valley has experienced little to no … Continue reading THIS JUST IN … Survey Shows Areas of Land Subsidence in the Sacramento Valley