Western Rivers

Does anyone know of companies that operate out of Minnesota? I’m from there and plan to return upon retiring from the Coast Guard. I’m getting my AB Limited for open ocean but was thinking of getting endorsements for Western Rivers as well. Just don’t really know how the industry operates up there and what they pay or if it would be worth exploring that route at all. I plan to work off the west coast or out here in Hawaii but have my family live in Minnesota. Seemed like it would nice to have the option of working back there also. Google didn’t give me much result, so any advice would be greatly appreciated.