attempted to descend it to the Snake, but found it impassable because of its violent rapids. The expedition named the Snake River the Lewis River, Lewis's River, or Lewis Fork, in his honor, and they traveled northwards to the Lochsa River, which they traveled via the Clearwater River into the lower Snake, and into the Columbia. They also referred to the Shoshone Indians as the "Snake Indians", which became the present-day name of the river. The name "Lewis Fork", however, did not last. Later American explorers traveled throughout the Snake River area and up its major tributaries beginning in 1806, just after Lewis and Clark had returned. The first was John Ordway in 1806, who also explored the lower Salmon River. John Colter in 1808 was the first to sight the upper headwaters of the Snake River, including the Jackson Hole area. In 1810, Andrew Henry, along with a party of fur trappers, discovered the Henrys Fork of the Snake River, which is now named after him. Donald Mackenzie sailed the lower Snake River in 1811, and later explorers included Wilson Price Hunt of the Astor Expedition (who gave the river the name "Mad River"), Ramsay Crooks, Francisco Payelle, John Grey, Thyery Goddin, and many others after the 1830s. Many of these later explorers were original members of the Lewis and Clark Expedition who had returned to map and explore the area in greater detail. Even later, American fur trappers scouted the area for beaver streams, but Canadian trappers from the British Hudson's Bay Company were by now a major competitor. The Hudson's Bay Company first sent fur trappers into the Snake River watershed in 1819. The party of three traveled into the headwaters of the Owyhee River, a major southern tributary of the Snake, but disappeared. Meanwhile, as American fur trappers kept coming to the region, the Hudson's Bay Company ordered the Canadian trappers to kill as many beavers as they could, eventually nearly eradicating the species from the Snake River watershed, under the "rationale [that] if there are no beavers, there will be no reason for the Yanks ([Americans]) to come." Their goal was to eventually gain rights over the Oregon Territory, a region covering Washington, Oregon, Idaho, and parts of Montana and Wyoming (most of the present-day region called the Pacific Northwest). However, the area was eventually annexed into the United States. By the middle 19th century,