Yolo County Surveys (1999, 2002, 2005)
  • View the complete status of the YOLO1999, YOLO1999 and YOLO2005 campaigns.

  • Summary

    The Yolo County project was designed and observed to provide a basis for monitoring subsidence in the county. It was accomplished to NGS Height Modernization guidelines. The project was first observed in 1999. It included stations selected from the I-80 corridor north to the Yolo- Colusa County line. It was bounded on the east by the Sacramento River and on the west along the foothills in western Yolo County.

    The project was re-observed in 2002 as suggested in a series of recommendations to the county following the 1999 project observations. The small portion of the county south of the I-80 corridor was added to the project. In addition the county was approached by the City of Sacramento to include some additional stations to the network. All of these stations were included in the 2002 project. Subsidence was noted, primarily along the I-5 corridor south to the Highway 113 intersection and then south along the Highway 113 corridor into Davis.

    The portion of the county south of the I-80 corridor was part of an earlier campaign survey, the Sacramento-San Joaquin Delta project observed in 1997.

    In the summer of 2005 the county was observed once again.

    All three projects (1999, 2002 and 2005) were funded by several agencies, primarily the California Department of Water Resources. Observers represented several different Federal, State, County and City agencies.

    Contributed by: Don Donofrio