When did Lewis and Clark find Sacajawea?

When Lewis and Clark wintered at the present site of Bismarck, North Dakota, there they met Sacagawea and her husband Toussaint Charbonneau. She was 16 or 17 when she and Toussaint, who was a French trapper, joined the Lewis and Clark party on November 4, 1804. Sacagawea really didn't assertively join the expedition. It was her husband Toussaint Charbonneau who was invited and hired by Lewis and Clark as an interpreter, and Sacagawea would at first only serve as a companion.