Ogden probably preceded Smith into Nevada, going a short distance into the northeastern corner of the territory in the spring of 1826. Ogden’s important expeditions, however, were in 1828, 1829, and 1830. He entered Nevada in November 1828 near the present town of Denio and proceeded south. He discovered a river, which he named the Unknown (the present-day Humboldt) River. The party did some trapping as it proceeded west, then it turned east along the river to buffalo country near present-day Ogden’s Hole in Utah. In the spring of 1829, Ogden retraced his route into Nevada, this time following the Unknown River until he reached its sink, the point where the river, having no outlet toward the ocean, pools into swampy flats and evaporates. He then turned north, leaving Nevada at present-day McDermitt.
Returning to Nevada in the fall of 1829, Ogden again traveled to the Humboldt Sink, but then turned southward to Walker Lake and continued southeast into California. Ogden was the first white man to follow the Humboldt River from its source to its sink. Ogden concluded that the San Buenaventura River did not exist.
Trapper Joseph R. Walker, attached to an expedition headed by U.S. Army Captain Benjamin Bonneville, led about 40 men to explore the Great Salt Lake. Whether he was ordered to proceed to the Pacific Ocean remains uncertain, but in August 1833 Walker and his men went west to California by way of the Unknown River. The trip included the first battle between native Nevadans and whites along the Unknown River. On the return journey in 1834 the Walker party left the Unknown near the site of present-day Wells. Moving northeast from there, Walker blazed a trail that later became a route for settlers from Fort Hall to the Unknown River. "Nevada" © Emmanuel BUCHOT, Encarta, Wikipedia
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