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The project was to reconstruct a portion of the East Entrance Road of Yellowstone National Park. The beginning of the project area was at Sylvan Pass and from there progressed to the east to the boundary of the national park with the Shoshone National Forest. The project was 6.93 miles (11.15 km) long and ranged in elevation from 8,500 feet (2,591 m) at the pass to 6,950 feet (2,118 m) at the east boundary. The project has a steady downhill grade that reaches a maximum grade of 7% in the most severe case. Figure 1 provides the project location.
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The climate in the project area is moderately dry with cool summers and cold winters. During the summertime average high temperatures are in the 70s (25 °C), and nights are cool with temperatures in the upper 30s to low 40s (5 to 10 °C). Winter temperatures often hover near zero (-20 °C) throughout the day, and nighttime lows are subzero. Yellowstone typically experiences periods of bitter cold weather. Annual snowfall averages near 150 inches (380 cm) in most of the park; however, 200 to 400 inches (5 to 10 m) have been recorded at higher elevations such as Sylvan Pass.