Lake Allison

Lake Allison
Location of Lake Allison in Oregon, USA.
Location of Lake Allison in Oregon, USA.
Lake Allison
Location of Lake Allison in Oregon, USA.
Location of Lake Allison in Oregon, USA.
Lake Allison
LocationWillamette Valley, Oregon
Coordinates45°N 123°W / 45°N 123°W / 45; -123
TypeTemporary lake (formed periodically from 12,000 to 15,000 years BP[1])
Primary inflowsGlacial Lake Missoula
Basin countriesUnited States
Max. length111 mi (179 km)
Max. width31 mi (50 km)
Surface area3,000 sq mi (7,800 km2)[2]
Average depth200 ft (61 m)[2]
Max. depth400 ft (120 m)[2]

Lake Allison was a temporary lake in the Willamette Valley of Oregon, formed periodically by the Missoula Floods from 15,000 to 13,000 BC. The lake is the main cause of the rich and fertile soil that now characterizes the Willamette Valley.

  1. ^ Cite error: The named reference depts.clackamas.cc.or.us was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference columbiariverimages.com was invoked but never defined (see the help page).