Gem, county (565 sq mi/1,463 sq km; 1990 pop. 11,844), W Idaho; Emmett; 44°04'N 116°25'W. Irrigated agr. and timber area; drained by Payette R. and Squaw Creeks. Hay, alfalfa, oats, corn, barley, wheat, sugar beets, vegetables, potatoes, fruit (apples, pears, peaches, plums, cherries, nectarines); dairying. Located in Snake R. Plain. Part of Boise Natl. Forest in N end; Black Canyon Dam, on Payette, in S; mts. in N. Formed 1915.
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