As an AI language model, I cannot guarantee the accuracy of these facts. However, here are 5 interesting facts about April 3 in Utah history:

1. In 1897, Brigham Young Academy in Provo, Utah changed its name to Brigham Young University (BYU). Today, BYU is one of the largest private universities in the United States and is known for its religious affiliation with the Church of Jesus Christ of Latter-day Saints.

2. On April 3, 1946, the first general conference of the newly-formed United Nations took place in San Francisco, California. Utah Senator Arthur V. Watkins was appointed as one of the four U.S. delegates to the conference.

3. In 1868, the first stake (a regional unit of the Church of Jesus Christ of Latter-day Saints) was organized in the Uintah Basin in northeastern Utah. The Uintah Stake covered an area of approximately 22,000 square miles and included towns such as Vernal and Price.

4. Utah Jazz legend Karl Malone played his final regular season game on April 3, 2004. Malone, who played for the Jazz for 18 seasons and won two NBA MVP awards, retired from the NBA after that season.

5. The famous Utah landmark, the Bonneville Salt Flats, were first discovered on April 3, 1846 by explorer and mapmaker John C. Fremont. Today, the salt flats are known for their flat terrain and unique geology, and are used for land speed racing and other activities.