Before conducting any excavation for fence posts in your yard, the law requires that you call Gopher State One Call to have utility lines located in your yard. Calls must be placed at least two business days before digging. View the Gopher State One Call website for specific details.
You should mark the digging area with white stakes or white spray paint otherwise the utility may mark your entire yard. You must not dig any closer than two feet from any utility markings. Utilities will only locate services that they installed. You or a private contractor are responsible for locating such services as sprinklers, power lines to a garage, gas grill line, or invisible fencing.