An interesting follow-up note to the Milltown Dam story: The estimated costs for cleaning up the Upper Clark Fork watershed are about $1 billion. William A. Clark, one of the most prominent of the Copper Kings (whose tainted election to the US Senate in 1899 launched a scandal that led to Montana's Corrupt Practices Law of 1912, limiting the amount of money that can be donated to political campaigns) built the Milltown Dam in 1906, to generate electricity for a sawmill that supplied timber frames to his mines upstream. William A. Clark's daughter, Huguette, died one year ago on May 24th, 2011, just two weeks' short of her 105th birthday. She left a fortune of over $400 million. Ms. Clark had been a recluse for decades and had been living secretly in a room at the Beth Israel Hospital in New York since at least 1988, even though she owned at least three mansions, one of them, in Santa Barbara, California, worth an estimated $100 million. An investigation into the loss or theft of millions of dollars from her estate is ongoing.