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1968 Map of Lyons

Name: 1968 Topographic Map of Lyons
Creator: U.S. Geological Survey
Published: 1974
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1974

About this map

Lyons serves as the focal point for this late-1960s survey, situated where the North St Vrain Creek and South St Vrain Creek converge to form St Vrain Creek. The landscape is defined by the sharp transition from the plains to the foothills, marked by numerous Quarries and industrial sites like the Longmont Powerplant. Significant water management infrastructure is evident throughout the terrain, including the St Vrain Supply Tunnel, St Vrain Supply Canal, and the Aqueduct system, illustrating the region's historical reliance on irrigation and power generation.

In the southern reaches of the map, the settlement of Altona lies near the Altona Grange, with the prominent Table Mountain rising to the east. The rugged topography of the Roosevelt National Forest dominates the west, where Coffintop Mountain and Fairview Peak overlook deep drainages like Deadman Gulch and Plumely Canyon. This era's map documents a complex network of ditches, such as the South Ledge Ditch and Crocker Ditch, which supported the local agricultural and mining operations of the time.