Blog Entry: December 21, 2010
Much of the geology of Whitman Mission is inextricably tied to the rivers and creeks that flow through and around it. With the exception of the memorial shaft hill (which we'll talk about next week), the park is strikingly flat. This is because we are located near the confluence of two of the area's most important water bodies: the Walla Walla River and Mill Creek. More specifically, Whitman Mission is located at the point where the floodplains of these two streams coalesce. If you were to dig a few feet down into the ground at just about any point in the park, you would find sand and gravel deposited by these two streams during major floods over the past few thousand years.