Yesterday several wondered why the lake was so low late in the spring. Here's the answer: Federal officials continue with a plan to drop levels more to boost downstream power production. Spokesman-Review reports that BPA officials want to lower the lake's winter levels by up to six inches daily, within a five-foot range. Increased flows could be worth millions of dollars in power generation and help meet peak power demands. But some north Idaho residents and lawmakers are worried about potential damage to docks and commercial marinas. Idaho officials say the plan could hasten erosion to river deltas, damage duck habitat and help the spread of noxious weeds.