April 26, 1805
Shields is sent up the Yellowstone (Roche Juane) River to explore. Lewis heads down the Yellowstone to explore that river's confluence with the Missouri. Joining Clark and the pirogues, they all camp near the confluence.
At the distance of five miles he passed a large Island well covered with timber, and three miles higher a large creek falls in on the S. E. side above a high bluff in which there are several stratas of coal. the country bordering on this river as far as he could percieve, like that of the Missouri, consisted of open plains.
April 26, 1806
The Corps continues up the Columbia River reaching the low plains around present Plymouth, Washington. The trail is dusty and crowded with Indians traveling in the same direction. An Indian boy catches several Columbia River chub.
This morning early we set forward and at the distance of three miles entered a low level plain country of great extent. here the river hills are low and receede a great distance from the river this low country commence on the S. side of the river about 10 miles below our encampment of last evening.