WILLIAMS — There was never enough wood. Despite all the ponderosa pines clogging northern Arizona’s forests with fire hazards, and despite all the cries for the government to remove enough of those trees to restore natural conditions, too few trucks dumped too few logs at a Williams sawmill after it opened in 2014. “We have lost millions of dollars here in three years,” said Rohit Tripathi, owner of Grand Canyon Forest Products, formerly Newpac Fibre. Twenty employees lacked the promise of steady, year-round work. The mill’s struggles reflect the U.S. Forest Service’s larger, lurching efforts to attract the private industry necessary to affordably thin pines that a century of fire suppression has allowed to grow thicker by the hundreds-per-acre. But Tripathi isn’t despairing — he’s investing.