LA CROSSE, Wis.-- Mayo Clinic Health System is celebrating a milestone.

It's been 20 years since the health system formed. What started as a partnership between Mayo Clinic in Rochester and six practices in Decorah, Iowa has grown to more than 70 locations across four states.

Along with health care, Mayo also helps local economies. In 2010, the health system made a 1.7 billion dollar impact on Wisconsin's economy and a 1.3 billion dollar impact on Minnesota.