The rain that flooded Duluth last week also flushed an unprecedented quantity of dirt, pollution and bacteria into Lake Superior. All that nasty debris may have sullied two of the 12 cleanest beaches in America.

There's no question Minnesota is home to beautiful lakes, but the most popular and largest in the state has become one of the top vacation spots in the country, according to a CNN report. Lake Winnebago in Wisconsin and another Minnesota destination, Lake Kabetogama, also made the list.

A group of brave surfers were spotted hitting the waves on Lake Superior Friday. WDIO in Duluth reports the air temperature was near single digits, but the Great Lake was in the mid-30s. One of the surfers says he's been catching the waves for the past 15 years.

A joint program, established in 1991, between the United States and Canada is on track to reduce nine toxic chemicals like mercury and PCBs by 2020. According to Minnesota Public Radio, a draft report says sources of pollution around Lake Superior have cut mercury emissions by 80 percent and dioxins by 85 percent.

Yes, that's a thing. The Star Tribune takes a look at Grand Marais' Dockside Fish Market, which processes 60,000 pounds of herring roe into caviar every year. Most of that is shipped to Scandinavian countries, but you can get a little right here in its native land.