The Humboldt River is fed by melting snow flowing from the Ruby and other mountains in north central Nevada and runs over 300 miles (480 km) mostly westward across the Great Basin to the Humboldt Sink in western Nevada where it evaporates.
The Great Basin covers essentially all of Nevada and parts of Utah, Idaho, Oregon and California and has no outlet to the sea.
The Great Basin lies in the rain shadow of the Sierra Nevada Mountains, and what little rainfall occurs there—stays there.
The Humboldt, headed nearly straight west, provided an easily followed pathway with feed and water across the Great Basin desert.
The Humboldt was praised for having water, fishing and feed along its banks and also cursed for its barely adequate grass, meandering and often muddy channel, and hot weather.
Its water quality became progressively worse the further the river went west.
The fire 'wood' needed for cooking and making coffee consisted of occasional junipers and ever present sagebrush and willows.

As found by about 1844, the trail at "parting of the ways" (Idaho) from the Snake River leads along the Raft River about 60 miles (97 km) southwest to the head of the Raft River and the City of Rocks (now called: City of Rocks National Reserve).
The Hudspeth Cutoff and the Salt Lake Cutoff all rejoined the California Trail near the City of Rocks (For maps see NPS map California Trail:).
The trail then continued west over 7,100 feet (2,200 m) Granite Pass, which involved a steep, treacherous descent.
West of Granite Pass, the trail was in the Great Basin drainage.
Rainfall in the Great Basin either flowed to the Humboldt River, sank into the ground or evaporated.
The trail then jogged northwest until it reached Goose Creek where it headed southwest, nicking the far northwest corner of Utah and on into the future state of Nevada.
The trail then headed southwest, down Goose Creek for about 34 miles (55 km) until it hit Thousand Springs Valley's creeks and springs.
The trail followed Thousand Springs Valley until it intercepted West Brush Creek and Willow Creek, which run into the Humboldt River.
 This about 160 miles (260 km) trail through Idaho and Nevada connecting the Snake River to the Humboldt River passed enough springs and creeks to provide the necessary feed and water for the California bound emigrants.
The trail hit the Humboldt River in northeastern Nevada near present-day Wells, Nevada.
Another branch of the trail went through Bishops Canyon and intercepted the trail about 10 miles (16 km) west of Wells.()
Humboldt Wells had good water and grass.
The distance from City of Rocks to Wells was about 100 miles (160 km).

The trail followed the north banks of the Humboldt west for about 65 miles (105 km) until it encountered the narrow 5 miles (8.0 km) long Carlin Canyon on the Humboldt.
Here the meandering river passed through a steep section of mountains, and its river valley became very narrow or only the width of the stream bed.
Various trail guides said you would have to ford the Humboldt from four to nine times to get through the canyon.
 Carlin Canyon became nearly impassable during periods of high water and a cutoff, the Greenhorn Cutoff, was developed to bypass the canyon when flooded.
West of Carlin Canyon, the trail climbed through Emigrant Pass and then descended again to rejoin the Humboldt at Gravelly Ford (near today's Beowawe, Nevada).
At Gravelly Ford the often muddy Humboldt had a good gravel bottom and was easily forded.
There was usually plenty of grass and fresh water springs nearby.
Many stayed here a while to rest and recuperate their livestock and themselves.
After the ford, the trail divided into two branches, following the north and south banks of the river.
The trail on the north side of the river was much better, allowing an easy miss of the Reese River sink.
Those who took the south side would have to travel around a big bend in the Humboldt and then cross the usually dry alkali-laden Reese River sink.
The two branches of the Trail rejoined at Humboldt Bar (sink).

At the Humboldt Sink (about 100 miles (160 km)
The Humboldt River is fed by melting snow flowing from the Ruby and other mountains in north central Nevada and runs over 300 miles (480 km) mostly westward across the Great Basin to the Humboldt Sink in western Nevada where it evaporates. The Great Basin covers essentially all of Nevada and parts of Utah, Idaho, Oregon and California and has no outlet to the sea. The Great Basin lies in the rain shadow of the Sierra Nevada Mountains, and what little rainfall occurs there—stays there. The Humboldt, headed nearly straight west, provided an easily followed pathway with feed and water across the Great Basin desert. The Humboldt was praised for having water, fishing and feed along its banks and also cursed for its barely adequate grass, meandering and often muddy channel, and hot weather. Its water quality became progressively worse the further the river went west. The fire 'wood' needed for cooking and making coffee consisted of occasional junipers and ever present sagebrush and willows.
As found by about 1844, the trail at "parting of the ways" (Idaho) from the Snake River leads along the Raft River about 60 miles (97 km) southwest to the head of the Raft River and the City of Rocks (now called: City of Rocks National Reserve). The Hudspeth Cutoff and the Salt Lake Cutoff all rejoined the California Trail near the City of Rocks (For maps see NPS map California Trail:). The trail then continued west over 7,100 feet (2,200 m) Granite Pass, which involved a steep, treacherous descent. West of Granite Pass, the trail was in the Great Basin drainage. Rainfall in the Great Basin either flowed to the Humboldt River, sank into the ground or evaporated. The trail then jogged northwest until it reached Goose Creek where it headed southwest, nicking the far northwest corner of Utah and on into the future state of Nevada. The trail then headed southwest, down Goose Creek for about 34 miles (55 km) until it hit Thousand Springs Valley's creeks and springs. The trail followed Thousand Springs Valley until it intercepted West Brush Creek and Willow Creek, which run into the Humboldt River.  This about 160 miles (260 km) trail through Idaho and Nevada connecting the Snake River to the Humboldt River passed enough springs and creeks to provide the necessary feed and water for the California bound emigrants. The trail hit the Humboldt River in northeastern Nevada near present-day Wells, Nevada. Another branch of the trail went through Bishops Canyon and intercepted the trail about 10 miles (16 km) west of Wells.() Humboldt Wells had good water and grass. The distance from City of Rocks to Wells was about 100 miles (160 km).
The trail followed the north banks of the Humboldt west for about 65 miles (105 km) until it encountered the narrow 5 miles (8.0 km) long Carlin Canyon on the Humboldt. Here the meandering river passed through a steep section of mountains, and its river valley became very narrow or only the width of the stream bed. Various trail guides said you would have to ford the Humboldt from four to nine times to get through the canyon.  Carlin Canyon became nearly impassable during periods of high water and a cutoff, the Greenhorn Cutoff, was developed to bypass the canyon when flooded. West of Carlin Canyon, the trail climbed through Emigrant Pass and then descended again to rejoin the Humboldt at Gravelly Ford (near today's Beowawe, Nevada). At Gravelly Ford the often muddy Humboldt had a good gravel bottom and was easily forded. There was usually plenty of grass and fresh water springs nearby. Many stayed here a while to rest and recuperate their livestock and themselves. After the ford, the trail divided into two branches, following the north and south banks of the river. The trail on the north side of the river was much better, allowing an easy miss of the Reese River sink. Those who took the south side would have to travel around a big bend in the Humboldt and then cross the usually dry alkali-laden Reese River sink. The two branches of the Trail rejoined at Humboldt Bar (sink).
At the Humboldt Sink (about 100 miles (160 km)
California Trail