Fargo, N.D. ? Salesmen in Fargo are hawking products with names like the Muscle Wall and the Sandbagging Buddy. Emergency workers in Keokuk, Iowa, are planning to barricade the water treatment plant with limestone boulders. The farmers’ cooperative in Quincy, Ill., is moving grain inland to keep it dry.

Spring could bring disastrous flooding again to the Upper Midwest, government forecasters are warning. And folks along the Red, the Mississippi and the Missouri rivers are taking precautions, especially after calamities last year and the year before.

“This is like having a two-month warning that a tornado is going to hit your house,” said Richard Thomas, who lives near Fargo. “There’s always the possibility we’ll be just fine, but it’s bothering me. It’s stressful.”

The National Weather Service said heavy snow cover and ground that is already saturated could lead to severe flooding in as little as a few weeks. Exactly how severe will depend on how fast the snow melts and how heavy the spring rains are.

In Fargo and neighboring Moorhead, Minn., an area of about 200,000 people, the chances of major flooding were projected Friday at about 90 percent. The probability of record flooding was put at 19 percent. Elsewhere across the Upper Midwest, the threat is less dire but still serious.

During March and April last year, rivers and streams burst their banks in North Dakota and Minnesota, forcing millions to evacuate, damaging hundreds of homes and causing an estimated $100 million in damage. At least three deaths were blamed on the rising waters.