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2019 Map of Lyons

Name: 2019 Topographic Map of Lyons
Creator: U.S. Geological Survey
Published: 2019
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2019

About this map

Lyons sits at the confluence of the north and south forks of the N Saint Vrain Cr, serving as a critical gateway to the higher elevations of the Roosevelt National Forest. This 2019 survey illustrates the complex water management infrastructure supporting the region, including the Button Rock Reservoir, Longmont Reservoir, and the Saint Vrain Supply Tunnel. The landscape is defined by dramatic geological transitions, from the narrow passages of the Big Narrows and Little Narrows to prominent peaks like Steamboat Mtn and Fairview Peak.

South of the main settlement, the community of Altona lies near the agricultural irrigation network of the Toll Gate Ditch and Haldi Ditch. Historical mining activity is evidenced by the Golden Age site in the southwest, while an extensive trail system, including the Bitterbrush Trail and Sleepy Lion Trail, indicates the modern transition towards recreation. The map meticulously records the intricate drainage patterns of Geer Canyon, Plumely Canyon, and Coffintop Gulch, which have shaped the settlement patterns of this Boulder County corridor.