The Corps of Engineers buckles slightly to federal court pressure and says it will lower the Missouri River to protect endangered species. But it will wait until next week. And it will only do it for three days. A federal judge in Minnesota says an earlier court order will remain in effect. Another federal court says the Corps does not have to do it. An environmental group, American Rivers, says three days is not long enough. It says it will go to court asking for an order that lasts longer.