Ancient Lake Bonneville levels

Great Salt Lake (remnant of Lake Bonneville) looking North East at the North end of the Oquirrh Mountains

LAKE BONNEVILLE

One of the earliest inhabitants of the Tooele Valley and other neighoringt valleys was the fresh water ancestor of the Great Salt Lake, Lake Bonneville, named after Captain Bonneville, an early explorer in the region.

It has been established that Lake Bonneville with a maximum depth of at least 1000 feet covered an area of about 20,000 square miles.  It extended from southern Iron County on the South to Bear Lake Valley and South Eastern Idaho on the Norht and from the Wasatch Mountains on the East to Eastern Nevada on the West.

Major terraces of lake levels (Stansbury, Bonneville, Provo, and Gilbert) (oldest to the Youngest respectively) are clearly visible on the West face of the Oquirrh Mountains and elsewhere in Tooele County.



Major Levels of Lake Bonneville
Years before present time Elevation above sea level Surface area
Stansbury -- 23,000 - 20,000 4500 ft 10,000 sq miles
Bonneville -- 16,000 - 15,000 5090 ft 20,000 sq miles
Provo -- 14,000 - 13,000 4740 ft 15,000 sq miles
Gilbert -- 11,000 - 10,000 4250 ft 7,000 sq miles

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