Pres. Clinton signed a bill yesterday designating the nation’s 55th national park, the Black Canyon of the Gunnison River in western Colorado, the first national park created in five years. The 30,000-acre area, most of which has been a national monument since 1933, features a canyon just 40 feet across at its narrowest point and up to 2,900 feet deep; the canyon floor is hit by sunlight for only about an hour a day. Sen. Ben Nighthorse Campbell (R-Colo.) worked for years to pass a bill creating the park.