Lake Allison
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.
| Lake Allison | |
|---|---|
Lake Allison Lake Allison | |
| Location | Willamette Valley, Oregon |
| Coordinates | 45°N 123°W |
| Type | Temporary lake (formed periodically from 12,000 to 15,000 years BP) |
| Primary inflows | Glacial Lake Missoula |
| Basin countries | United States |
| Max. length | 111 mi (179 km) |
| Max. width | 31 mi (50 km) |
| Surface area | 3,000 sq mi (7,800 km2) |
| Average depth | 200 ft (61 m) |
| Max. depth | 400 ft (120 m) |
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