1963 Map of Eldorado Peak

Lower elevations show the intersection of industrial attempts and preservation, with the Crescent Mine located near the headwaters of Marble Creek. The boundary between North Cascades National Park and the Mt. Baker-Snoqualmie National Forest cuts across the southern portion of the sheet, where drainage basins like Sibley Creek and Roush Creek flow from the peaks. High alpine basins hold isolated water bodies such as Stout Lake and Hidden Lake, accessible only by the primitive trail networks of the era.