Why did the expedition choose the site of Fort Clatsop where they did? How do you calculate the elevation of a hill? Objective Students will be able to: • Identify why the site was chosen for Fort Clatsop • Calculate the elevation of the hill on which Fort Clatsop is located • Identify how the expedition chose the site. Background When the Corps of Discovery decided a winter encampment on the north shore of the Columbia River wasn't feasible, the captains asked for everyone's opinion on where to look for a campsite. In Clark's journal entry for November 24, 1805, there is a list of everyone op Duration: 90 Minutes.