By 1847, two former fur trading frontier forts marked trailheads for major alternative routes through Utah and Wyoming to Northern California.
The first was Jim Bridger's Fort Bridger (est.
1842) in present-day Wyoming on the Green River, where the Mormon Trail turned southwest over the Wasatch Range to the newly established Salt Lake City, Utah.
From Salt Lake the Salt Lake Cutoff (est.
1848) went north and west of the Great Salt Lake and rejoined the California Trail in the City of Rocks in present-day Idaho.

The main Oregon and California Trails crossed the Yellow River on several different ferries and trails (cutoffs) that led to or bypassed Fort Bridger and then crossed over a range of hills to the Great Basin drainage of the Bear River (Great Salt Lake).
Just past present-day Soda Springs, Idaho, both trails initially turned northwest, following the Portneuf River (Idaho) valley to the British Hudson's Bay Company's Fort Hall (est.
1836) on the Snake River in present-day Idaho.
 From Fort Hall the Oregon and California trails went about 50 miles (80 km) southwest along the Snake River Valley to another "parting of the ways" trail junction at the junction of the Raft and Snake rivers.
The California Trail from the junction followed the Raft River to the City of Rocks in Idaho near the present Nevada-Idaho-Utah tripoint.
 The Salt Lake and Fort Hall routes were about the same length: about 190 miles (310 km).

From the City of Rocks the trail went into the present state of Utah following the South Fork of the Junction Creek.
From there the trail followed along a series of small streams, such as Thousand Springs Creek in the present state of Nevada until approaching present-day Wells, Nevada, where they met the Humboldt River.
By following the crooked, meandering Humboldt River Valley west across the arid Great Basin, emigrants were able to get the water, grass, and wood they needed for themselves and their teams.
The water turned increasingly alkaline as they progressed down the Humboldt, and there were almost no trees. "
Firewood" usually consisted of broken brush, and the grass was sparse and dried out.
Few travelers liked the Humboldt River Valley passage.

[The] Humboldt is not good for man nor beast ... and there is not timber enough in three hundred miles of its desolate valley to make a snuff-box, or sufficient vegetation along its banks to shade a rabbit, while its waters contain the alkali to make soap for a nation.

— Reuben Cole Shaw, 1849
At the end of the Humboldt River, where it disappeared into the alkaline Humboldt Sink, travelers had to cross the deadly Forty Mile Desert before finding either the Truckee River or Carson River in the Carson Range and Sierra Nevada mountains that were the last major obstacles before entering Northern California.

An alternative route across the present states of Utah and Nevada that bypassed both Fort Hall and the Humboldt River trails was developed in 1859.
This route, the Central Overland Route, which was about 280 miles (450 km) shorter and more than 10 days quicker, went south of the Great Salt Lake and across the middle of present-day Utah and Nevada through a series of springs and small streams.
The route went south from Salt Lake City across the Jordan River to Fairfield, Utah, then west-southwest past Fish Springs National Wildlife Refuge, Callao, Utah, Ibapah, Utah, to Ely, Nevada, then across Nevada to Carson City, Nevada. (
Today's U.S. Route 50 in Nevada roughly follows this route.) (
See: Pony Express Map) In addition to immigrants and migrants from the East, after 1859 the Pony Express, Overland stages and the First Transcontinental Telegraph (1861) all followed this route with minor deviations.

Once in western Nevada and eastern California, the pioneers worked out several paths over the rugged Carson Range and Sierra Nevada mountains into the gold fields, settlements and cities of northern California.
The main routes initially (1846–48) were the Truckee Trail to the Sacramento Valley and after about 1849 the Carson Trail route to the American River and the Plac
By 1847, two former fur trading frontier forts marked trailheads for major alternative routes through Utah and Wyoming to Northern California. The first was Jim Bridger's Fort Bridger (est. 1842) in present-day Wyoming on the Green River, where the Mormon Trail turned southwest over the Wasatch Range to the newly established Salt Lake City, Utah. From Salt Lake the Salt Lake Cutoff (est. 1848) went north and west of the Great Salt Lake and rejoined the California Trail in the City of Rocks in present-day Idaho.
The main Oregon and California Trails crossed the Yellow River on several different ferries and trails (cutoffs) that led to or bypassed Fort Bridger and then crossed over a range of hills to the Great Basin drainage of the Bear River (Great Salt Lake). Just past present-day Soda Springs, Idaho, both trails initially turned northwest, following the Portneuf River (Idaho) valley to the British Hudson's Bay Company's Fort Hall (est. 1836) on the Snake River in present-day Idaho.  From Fort Hall the Oregon and California trails went about 50 miles (80 km) southwest along the Snake River Valley to another "parting of the ways" trail junction at the junction of the Raft and Snake rivers. The California Trail from the junction followed the Raft River to the City of Rocks in Idaho near the present Nevada-Idaho-Utah tripoint.  The Salt Lake and Fort Hall routes were about the same length: about 190 miles (310 km).
From the City of Rocks the trail went into the present state of Utah following the South Fork of the Junction Creek. From there the trail followed along a series of small streams, such as Thousand Springs Creek in the present state of Nevada until approaching present-day Wells, Nevada, where they met the Humboldt River. By following the crooked, meandering Humboldt River Valley west across the arid Great Basin, emigrants were able to get the water, grass, and wood they needed for themselves and their teams. The water turned increasingly alkaline as they progressed down the Humboldt, and there were almost no trees. "Firewood" usually consisted of broken brush, and the grass was sparse and dried out. Few travelers liked the Humboldt River Valley passage.
[The] Humboldt is not good for man nor beast ... and there is not timber enough in three hundred miles of its desolate valley to make a snuff-box, or sufficient vegetation along its banks to shade a rabbit, while its waters contain the alkali to make soap for a nation.
— Reuben Cole Shaw, 1849
At the end of the Humboldt River, where it disappeared into the alkaline Humboldt Sink, travelers had to cross the deadly Forty Mile Desert before finding either the Truckee River or Carson River in the Carson Range and Sierra Nevada mountains that were the last major obstacles before entering Northern California.
An alternative route across the present states of Utah and Nevada that bypassed both Fort Hall and the Humboldt River trails was developed in 1859. This route, the Central Overland Route, which was about 280 miles (450 km) shorter and more than 10 days quicker, went south of the Great Salt Lake and across the middle of present-day Utah and Nevada through a series of springs and small streams. The route went south from Salt Lake City across the Jordan River to Fairfield, Utah, then west-southwest past Fish Springs National Wildlife Refuge, Callao, Utah, Ibapah, Utah, to Ely, Nevada, then across Nevada to Carson City, Nevada. (Today's U.S. Route 50 in Nevada roughly follows this route.) (See: Pony Express Map) In addition to immigrants and migrants from the East, after 1859 the Pony Express, Overland stages and the First Transcontinental Telegraph (1861) all followed this route with minor deviations.
Once in western Nevada and eastern California, the pioneers worked out several paths over the rugged Carson Range and Sierra Nevada mountains into the gold fields, settlements and cities of northern California. The main routes initially (1846–48) were the Truckee Trail to the Sacramento Valley and after about 1849 the Carson Trail route to the American River and the Plac
California Trail