The journey of Frémont lay up the North Fork of the Platte, through South Pass, into Wind River Valley, his march being marked by the usual experiences of hardship and suffering inseparable from the time and region. The most notable event of the journey was the ascent of the main and highest peak of the Wind River range, now known as Frémont’s Peak. Their first attempts were unsuccessful, the party suffering from great cold, excessive fatigue, and mountain fever resulting from the rarity of the air. Frémont, however, persevered and succeeded. He describes the final ascent as follows:

“We reached a point where the buttress was overhanging, and there was no other way of surmounting the difficulty than by passing around one side of it, which was the face of a vertical precipice of several hundred feet. Putting hands and feet in the crevices between the blocks I succeeded in getting over it, and when I reached the top found my companions in a small valley below. Descending to them, we continued climbing and in a short time reached the crest. I sprang upon the summit and another step would have precipitated me into an immense snow-field five hundred feet below. At the edge of this field was a sheer icy precipice, and then, with a gradual fall, the field sloped off for about a mile until it struck the foot of another lower ridge. I stood on a narrow crest about three feet in width. As soon as I had gratified the first feelings of curiosity I descended, and each man ascended in turn, for I would only allow one at a time to mount the unstable and precarious slab, which it seemed a breath would hurl into the abyss below. We mounted the barometer in the snow at the summit, and fixing a ramrod in the crevice, unfurled the national flag to wave in the breeze where never flag waved before.” The elevation of this summit, as determined by Frémont, was 13,570 feet.

His success on this expedition caused his most favorable reception by the War Department on his return to the States.

Ascending Frémont’s Peak.

Frémont’s second expedition contemplated the connection of his first explorations with those made by Captain Wilkes on the Pacific Coast, so as to give a connected survey across the interior of North America. The party, which left Kansas City May 29, 1843, consisted of forty men, equipped with twelve carts for transportation and a light wagon for scientific instruments. The route followed was up the valley of the Kansas River, thence by the South Fork of the Platte to the vicinity of the present city of Denver. After considerable hesitation a northerly route was taken, skirting the westerly limits of the great Laramie plain, which brought Frémont to the emigrant trail in the vicinity of the South Pass. The volume of travel toward the Pacific Coast even at that early date may be estimated from his description of the Oregon trail as “a broad smooth highway where the numerous heavy wagons of the emigrants have entirely beaten and crushed the mountain sage.”

Crossing Green River and following up Ham’s Fork, Frémont reached the valley of Bear River, the principal tributary of Great Salt Lake, which was filled with emigrants travelling to the lower Columbia River. Frémont expressed his surprise at the confidence and daring of the emigrants as he met in one place “a family of two men and women and several children travelling alone through such a country so remote from civilization.” Turning south from this point and quitting the travelled road Frémont visited the Great Salt Lake, of which he says: “Hitherto this lake had been seen only by trappers, who were wandering through the country in search of new beaver streams, caring very little for geography; its lands had never been visited, and none were to be found who had entirely made the circuit of its shores, and no instrumental observations or geographical survey of any description had ever been made anywhere in the neighboring region. It was generally supposed that the lake had no visible outlet, but among the trappers, including those in my own camp, were many who believed that somewhere on its surface was a terrible whirlpool, through which its waters found their way to the ocean by some subterranean communication.”

The lake was eventually reached from the lower part of Bear River in an india-rubber canoe, by means of which Frémont also landed on a mountainous island near the centre of the lake, where from an elevation of eight hundred feet he was able to determine with considerable accuracy the contours and extent of this remarkable body of water. Instead of a tangled wilderness of shrubbery teeming with an abundance of game, as the party expected, the island proved to be broken, rocky land, some twelve miles in circumference, on which there was neither water nor trees; a few saline shrubs and other hardy plants formed the only vegetation. The lake is described as being enclosed in a basin of rocky mountains, which sometimes leave grassy fields and extensive bottoms between them and the shore, while in other places they come directly down to the water in bold and precipitous bluffs. He speaks of the water of the lake being at a low stage and the probabilities that the marshes and low ground are overflowed in the season of high water. Frémont says that “we felt pleasure in knowing that we were the first who in the traditional annals of the country had visited the island and broke with joyful sounds the long solitude.” But in view of the dissipation of his dream of fertility he named it Disappointment Island.

Turning northward Frémont reached, on September 18, 1843, Fort Hall, Idaho, then a post under British control, whose original importance as an Indian trading-post had been greatly enhanced by its location on the emigrant route to Oregon, at a distance of over one thousand three hundred miles from the then frontier settlement of Westport, Mo. Following closely the emigrant trail Frémont, on October 8th, passed Fort Boisé, then occupied by the Hudson Bay Company, and on the 25th of the month arrived at another trading establishment of this company, at the junction of the Walla Walla and Columbia Rivers. This was considered by emigrants as the practical termination of their overland journey since navigation down the river was rapid and convenient.

Frémont found many American emigrants at Fort Vancouver on his visit to that post and also learned that others already occupied the adjacent lowlands of the Willamette Valley. Moreover, these pioneers were not confining their efforts to Oregon, for while small parties were pushing southward through that valley to settlements in Northern California, still others, making detours near Fort Hall, reached, by a more direct route through passes in the Sierra Nevada, the banks of the Sacramento.