The following are additions that have been made to this edition of the map.

Washington:

• Cowlitz Route (1845)
• Naches Pass Trail (1853)

Oregon:

• Meeks Cutoff (1845)
• Elliot´s Alternate (1853)
• Macy´s Alternate (1854)
• Free Emigrant Road (1853)
• Columbia River Route (by 1841)

Washington - Montana:

• Mullan Road (1862)

Montana:

• Medicine Lodge Trail (1862)
• Bannack Road (1862/63)
• Bannack to Virginia City Road (1863)
• Virginia City Road (1863)
• Helena Road and Alternate (1864)
• Helena Road (1865)
• Jacob´s Cutoff (to Bridger Trail) (1864)

Idaho - Montana:

• Nez Perce Trail (1862)

Idaho:

• Trail to Montana (1862)
• Connor´s Cutoff (1863)

Wyoming - Montana:

• Bridger Trail (1864)

Utah:

• Trail to Montana (1862)

Minn.-S. & N. Dak.-Mont.:

• Northern Route (1862-67) inset

Nevada:

• Truckee Trail to Carson Trail connector (1849)
• Bidwell-Bartleson Route (1841)

Colorado - Wyoming:

• Cherokee Trail (1849 and 1850)

Colorado:

• Cherokee Trail Chico Creek Cutoff (1850)

Wyoming inset:

• Inset expanded from South Pass westward

Mexico - Arizona:

• El Camino Del Diablo

Texas:

• Trammel´s Trace (1820s)
• Central National Road (1844)
• Preston Road (1840/41)
• Military Forts Route (1867)

Arkansas:

• Southwest Trail (1820s)

Arkansas - Oklahoma:

• Wet Weather Trail (1820s)

Oklahoma - Ark. - Missouri:

• Texas Road (1820s)

Oklahoma:

• Seaton´s Trail (1835)
• Gregg´s Trail (1840)

Kansas - Oklahoma:

• Military Road (1839), (1840), and (1845)

Kansas - Nebraska:

• Fort Riley - Fort Kearny Road (1853)

Kansas - Colorado:

• Smoky Hill Trail (1859), (1860/65), and (1866)

Nebraska:

• Plattsmouth Roads (1848)

Oregon - California:

• Oregon to California Trail (1830s)

California:

• Central Valley Trail to gold fields (1849)
• Couts - Whipple Wagon Road (1849)

California - Nevada inset:

• Nevada City Road (1850)
• Virginia City roads (1860), (1860/61), and (1862)

Missouri to California:

• Pony Express Trail (1860-1861) for informational purposes
• Trail to Montana (1862)