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In page Little Sahara Recreation Area:

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The Little Sahara sand dunes are remnants of a large river delta formed by the Sevier River from about 12,500 to 20,000 years ago. The river emptied into ancient Lake Bonneville near the present day mouth of Leamington Canyon. After Lake Bonneville receded, winds transported the sand from the river delta to the current location. The dunes are still moving 5 to 9 feet (1.5 to 2.7 m) per year.[1] One of the primary barriers to the sand movement are the Sand Hills, which are located entirely within the recreation area and substantially slow the movement of the blowing sand.[1]