Survey Terrain and Constraints
4 hoursWalk the proposed corridor, note slopes, wetlands, and sensitive habitat before marking a centerline.
Field context
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Walk the proposed corridor, note slopes, wetlands, and sensitive habitat before marking a centerline.
Measure elevation gain over horizontal distance to keep grades within sustainable limits for the target user group.
Plot the centerline on a topographic map with switchback locations and drainage crossings marked.
Flag the approved route with survey tape and document decision points for the build crew.
Follow IMBA and USFS guidelines for out-sloped tread and grade reversals.
Avoid straight fall-line routes — they channel water and erode quickly.
Map grades rarely match ground truth; always confirm with clinometer.
Check land agency requirements before clearing vegetation.