Mosquito Pass, with an elevation of 13,185 ft, is a high mountain pass in the Mosquito Range of central Colorado in the United States. It lies on the boundary between Lake and Park counties between Leadville and Fairplay. It also lies on the divide between the Arkansas and South Platte Rivers, which is the informal demarcation between the northern and s…Mosquito Pass, with an elevation of 13,185 ft, is a high mountain pass in the Mosquito Range of central Colorado in the United States. It lies on the boundary between Lake and Park counties between Leadville and Fairplay. It also lies on the divide between the Arkansas and South Platte Rivers, which is the informal demarcation between the northern and southern parts of Colorado, east of the Continental Divide.