>> BOTH REALLY INTERESTING CASES WITH WIDESPREAD IMPLICATIONS. THANK YOU VERY MUCH. >> Reporter: THANK YOU. >>> TURNING TO THE FLOODING NOW, AND THE DANGEROUS WEATHER IMPACTING MILLIONS OF AMERICANS IN THE MIDWEST. THIS VIDEO SHOWS THE DEVASTATION ACROSS SOUTH CAROLINA. AT LEAST ONE PERSON WAS KILLED. EVACUATIONS WERE ORDERED IN PARTS OF IOWA AFTER THE HEAVY RAINS DESTROYED HOMES AND SWALLOWED FARM FIELDS. IOWA'S GOVERNOR CALLED THE FLOODING IN THE STATE CATASTROPHIC. >> FROM CBS MINNESOTA, JOINING US NOW FROM ALL OF PLACES, WATERVILLE, MINNESOTA, YOU CAN'T SORT OF ESCAPE THE OBVIOUS IRONY. JENNIFER, HOW IS IT LOOKING OUT THERE? >> Reporter: I MEAN, THE WATER CONTINUES TO RISE HERE. HISTORIC RAINFALL FELL OVER THE LAST FEW DAYS, AND IT LED TO CATASTROPHIC FLOODING, WORKING OUT ENTIRE NEIGHBORHOODS. YOU CAN SEE SANDBAGS HERE AROUND THIS HOME, HOPING TO KEEP THE WATER OUT, AS IT CONTINUES TO RISE. AND IT'S NOT JUST HERE. RECORD-SETTING FLOODING INUNDATED PARTS OF IOWA, AND SOUTH DAKOTA. HERE IN WATERVILLE, PARTS OF THE CITY ARE UNDERWATER. >> THEY SAID IT'S ONLY GOING TO GET WORSE, SO WE'RE JUST BRACING, AND HOPEFULLY IT'S NOT GOING TO GET ANY WORSE THAN THIS. >> Reporter: A STATE OF EMERGENCY REMAINS WHERE UP TO 18 INCHES OF RAIN FELL HERE. THE NATIONAL GUARD IS EXPECTED TO ARRIVE TODAY, AND HELP WITH THE RISING FLOOD WATERS. >> IT'S RIDICULOUS. I DON'T EVEN KNOW IF THERE'S A WORD FOR IT. IT'S JUST UNBELIEVABLE. >> Reporter: PARTS OF IOWA ARE UNDERWATER TOO. DRONE VIDEO OVER ROCK VALLEY SHOWS ONLY TREES ARE VISIBLE FROM ABOVE. THERE WERE 250 WATER RESCUES ON SATURDAY ALONE. >> I CAN TELL YOU THE DEVASTATION IS SEVERE AND IT'S WIDESPREAD. >> Reporter: THE STATE'S GOVERNOR ISSUED A DISASTER DECLARATION IN 21 COUNTIES AFTER MORE THAN A DOZEN RIVERS FLOODED IN THE NORTHWEST PART OF THE STATE. >> IN ALMOST EVERY COMMUNITY IMPACTED, THE RIVERS CRESTED SEVERAL FEET ABOVE RECORD LEVELS FROM THE FLOODS OF 1993. >> Reporter: IN SOUTH DAKOTA, AT LEAST ONE PERSON WAS KILLED AFTER HEAVY RAINS AND FLOODING INUNDATED THE EASTERN PART OF THE STATE. FLOOD WATERS THERE WILL CONTINUE TO POSE A THREAT ACROSS OTHER PARTS OF THE MIDWEST. SEVERE WEATHER SPAWNED SIX TORNADOES THAT STRUCK SOUTHERN WISCONSIN OVER THE WEEKEND. IN ARGYLE, STORMS FLATTENED THE HISTORIC APPLE GROVE LUTHERAN CHURCH, FOUNDED IN 1893. MINNESOTA SENATORS VISITED THE AREA YESTERDAY AND SAID THEY'RE WORKING WITH THE FEDERAL GOVERNMENT TO DELIVER MORE ASSISTANCE TO THESE HARD-HIT AREAS. NOW THE CHANCE OF MORE STORMS HERE REMAINS LOW, BUT OTHER PARTS OF THE MIDWEST WILL REMAIN ON ALERT LATER TODAY, ANNE-MARIE. >> SO JAN, I'M JUST SORT OF LEARNING ABOUT WATERVILLE. IS THIS AN AREA THAT TYPICALLY FLOODS WHEN THERE'S A LOT OF RAIN, OR JUST OUT OF THE ORDINARY FOR THEM? >> Reporter: IT DOES SEE FLOODING. BUT THIS KIND OF FLOODING IS OUT OF THE ORDINARY. I WAS JUST TALKING WITH THE FIRE CHIEF. HE SAID THIS IS WORSE THAN THE HISTORIC 1965 FLOODING, SAYING IT'S 23 INCHES ABOVE THAT TIME, AND IT'S WORSE THAN THE FLOODING WE SAW A DECADE AGO IN 2014. THE WATER HERE, THEY ARE WORRIED THAT IT CONTINUES TO RISE. THEY HAVE MORE SANDBAGS COMING IN. 70,000 FILLED AND PUT OUT SO FAR. MORE PEOPLE FILLING THEM TODAY. HE TELLS ME THAT THIS IS JUST SOMETHING THAT THE COMMUNITY IS WORRIED ABOUT. AND ALSO, WHEN WE TALK ABOUT FLOOD INSURANCE, ANNE-MARIE, IN AN AREA LIKE THIS, BECAUSE IT'S PRONE TO FLOODING, BUT NOT THIS BAD, HE SAID VERY FEW PEOPLE HAVE IT, BECAUSE IT'S SO EXPENSIVE. I TALKED TO A HOMEOWNER HERE JUST ACROSS THE STREET. HE SAID THEY DO NOT HAVE THAT FLOOD INSURANCE. SO SANDBAGS,
