landowners in the lower altitudes where grasses and shrublands are dominant. Higher up, Douglas fir, larch, and lodgepole pine slowly give way to Engelmann Spruce and whitebark pine as the altitude increases. Above the treeline at 8,000 feet (2,400 m) the trees abruptly end and alpine flowers and grasses are found. A small grizzly bear population is located in the wilderness zones of the forest with black bear, mountain goat, bighorn sheep, elk and moose found all over this forest. An active effort to reintroduce the grizzly bear to the region concluded in 2000 with a plan to release 25 bears into the wilderness zones over a five-year period beginning in 2003. There are 1,600 mi (2,500 km) of trails and 18 improved campgrounds within the forest. Outstanding fishing is found in the dozens of rivers and streams and lakes. The forest headquarters is located in Hamilton, Montana. There are local ranger district offices in Darby, Stevensville, and Sula. The largest nearby city is Missoula, Montana. The scenic Blodgett Canyon is but one of many steep canyons located in the forest. U.S. Highway 93 passes through portions of the forest. Wilderness areas There are three officially designated wilderness areas in Bitterroot National Forest that are part of the National Wilderness Preservation System. All of them, however, lie mostly in neighboring National Forests (or in Bureau of Land Management land), as indicated. Anaconda-Pintler Wilderness (partly in Beaverhead NF, Deerlodge NF) Frank Church—River of No Return Wilderness (partly in Payette NF, Challis NF, Salmon NF, Boise NF, Nez Perce NF, or on BLM land) Selway-Bitterroot Wilderness (partly in Nez Perce NF, Clearwater NF, Lolo NF) Unprotected roadless areas Much of the forest outside of designated wilderness areas is still roadless and undeveloped. In addition to roadless acreage adjacent to designated wildernesses, a large roadless area 164,000 acres in size (as of 1992) and straddling the Montana-Idaho state line exists just west of Lost Trail Pass. This area, named for 9,154' Allan Mountain (in Idaho), lies mostly in Montana and is critical to the migration of wildlife between the wildlands of central Idaho and the Greater Yellowstone Ecosystem. The Allan Mountain area is a lower-elevation part of the Bitterroot Range that features extensive coniferous forests, steep canyons, and pockets of old-growth ponderosa pine and Douglas-fir. Within the area is Overwhich Falls, a popular attraction; hiker's gentian (gentianopsis simplex) and primrose monkey flower (mimulus