A wheat farmer in Saguache, Mears first built a road over Poncha Pass to gain access to the flour mill at Nathrop, which served the Leadville market. Mears told a story many times in his life that his decision to become a road builder followed an encounter with William Gilpin, former Territorial Governor of Colorado, on Poncha Pass while struggling to bring his flour to market over the poorly built road. He applied to the Colorado legislature for toll road charters for his roads and built the roads in conformations and at grades suitable for railways. His routes over Poncha Pass and Marshall Pass were purchased for road beds by the Denver and Rio Grande railway.