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300 million years ago Wichita Mountains form
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15,000 years ago Columbian mammoths roam prairie
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1834 First official meeting between United States and Indians of Southern Plains occurs north of present-day Altus
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1860 Texas organizes present-day Southwest Oklahoma as Greer County, Texas
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1876 First longhorns driven up Western Trail
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1886 Frazer (forerunner of Altus) founded
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1896 Greer County, Texas, becomes Greer County, Oklahoma Territory
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1901-1904 Altus known as "Leger," in deference to Orient Railroad
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1927 Lugert Dam completed on North Fork of Red River
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1943 Altus Army Air Field begins operation during World War II--reactivated (1953) as Altus Air Force Base
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1947 W C Austin Project completes new dam at Lake Lugert, resulting in modern lake and Lugert-Altus Irrigation District
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1970 Museum of the Western Prairie opens