Michigan has more than 100,000 miles of pipelinesâhere's what they do We take a look at the pipelines existing in the state of Michigan. and last updated 2021-05-12 22:43:17-04 The pipeline system in Michigan is vast, convoluted and crisscrosses more than 120,000 miles. About 97% of the lines carry natural gas, and 3% carry what are considered hazardous liquids like propane, petroleum, and crude oil, according to the Tip of the Mitt Watershed Council, a nonprofit organization in Northern Michigan. Tip of the Mitt Watershed Council A map of the pipelines in Michigan. (Courtesy: Tip of the Mitt Watershed Council) Pipelines have an important role in transporting the fuel used to heat homes, power cars and planes, and even help make household goods.