Locating where pipelines are buried can be very difficult and dangerous. Getting your lines marked is quick and easy with 811. When you dial 811, your call is forwarded to the One Call Center in your area for processing. Local One Call Center operators record the location of the dig and then notify the affected utility companies of your digging plans. Your utility companies then dispatch a professional locating crew to mark the approximate location of your lines within a few days.
This exercise will assist you in recognizing that you can't always decide where the line is by looking.
Try it yourself. Click where you think the pipeline is located, if you get stumped, click on the 811 logo.