In addition to the Minnesota volunteers, more than 50 people from Wisconsin, about 30 Iowans and 19 people from North and South Dakota have traveled south to assist the recovery effort.
"We did all that we could, but it would never have been enough," Kristin Massey wrote on Tuesday. She added, "I encourage everyone to continue to give manpower wherever they can."
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Southwest Louisiana balanced on a knife's edge early Tuesday as Tropical Storm Harvey threatened to inundate the region with potentially disastrous flooding.
Hurricane Harvey has inflicted much human misery since Friday, and now its aftermath is causing economic harm. Experts say the flooding may end up damaging oil refineries and boosting gas prices.
When a disaster strikes, people everywhere often are inspired to spring into action. But donating good or services rarely is a good idea, experts say, and even cash donations could be better targeted.