Colvocoresses has a limited account, his journal ends in the Umpqua Valley.
Four years in the Government Exploring Expedition by George M. Colvocoresses, Fairchild, NY, 1855.
(at Willamette Mission) September 7, 1841- The number of Indian children to whom they give instruction does not exceed twenty, and the adult Indians living about the settlement, are entirely neglected. (276)
September 8- (south of Chemeketa) Mr. Turner… has an Indian woman to keep house for him, and seems perfectly contented.
September 9- (near Luckamiute- they were on the west side of the valley) I took a stroll and fell in with an encampment of Calipoya Indians. There were altogether five families of them, and each had its own fire and tent. They were miserably clad, and their habitations were swarming with vermin. The surrounding country was perfectly level, and produced luxurious grasses and some trees.
September 10- We crossed this day several streams, which are tributary to the Willamette. [likely very close to the Luckamiute a braided set of tributaries] The country continued level, but all the vegetation, except the trees, had been destroyed by fire, said to have been kindled by the Prairie Indians, for the purpose of procuring a certain species of root, which forms a principal part of their food.