Its walls are steeper but shallower than those of the North Fork of Lake Creek, which drains into Twin Lakes Reservoir and the headwaters of the Arkansas River, on the east. The pass is above tree line, so the surrounding terrain is alpine tundra. Open grassy expanses are occasionally broken by low shrubbery and bare patches of rock, particularly on the steep slope to the north. Snow lingers in some areas year-round. Adjacent to the road and parking area are small ephemeral pools on the southwest, with a larger, permanent one north of the road. History Like the surrounding mountains, the pass was created by glaciation and erosion over thousands of years. Before European-American settlers arrived, it was in the territory of the Ute Native American tribe. One of the earliest sightings by a European-American was in 1806, when Zebulon Pike, mapping the southern boundary of the Louisiana Purchase, spotted the gap in what would later be named the Sawatch Range from the upper Arkansas River valley. It was not explored until Ferdinand Hayden and his team surveyed it in 1873. At the time it was known as Hunter Pass. Three years later, in 1876, Colorado became a state. At the time settlement had pushed as far west from its capital, Denver, as Leadville. There was a variety of metals and minerals in the surrounding mountains, and some miners had become rich from their claims there. Those who had not been so successful heard about reports from prospectors of abundant silver deposits farther west, over the Divide. Governor Frederick Walker Pitkin had ordered all settlers to stay to the east of the Divide, as the state and federal governments had not made peace with the Utes. Nevertheless, some defied the order, drawn by the prospect of mining fortunes. Settlers sometimes used Hunter Pass to get to Ashcroft, an early camp on Castle Creek above the Roaring Fork. However, they preferred to take the southern route over the slightly higher Cottonwood Pass through Taylor Park and then back over Taylor Pass to get there, even though this made for a 100-mile (160 km) journey, 40 miles (64 km) more than the direct route offered by Hunter Pass. On July 4, 1879, a group from Leadville struck gold in the uppermost Roaring Fork valley below the pass. Four miles (6.4 km) to the west, they established a settlement in the upper Roaring