Numerous communities abutting, sometimes straddling I-70 in the Clear Creek Valley from Idaho Springs to Graymont, attest to the 19th and early 20th century history of mineral, milling, timber, and railroad industries in Colorado. Idaho Springs has been designated a National Register District, and Georgetown/Silver Plume is a National Historic Landmark District. Hundreds of other structures and sites in the area are believed to be eligible for the State and National Registers of Historic Places.
Continued monitoring, outreach, and participation in Section 106 review are needed for I-70 projects. CPI is a consulting party for the highway planning process and will continue to support connections to historic attractions and fight road expansion. Recently, CPI has supported trail connections and the Argo Mill project in Idaho Springs.