1. In 1805, the Lewis and Clark Expedition camped at a site near present-day Wolf Creek, Montana on April 30th. They named the area "Camp Disappointment" because the water was too shallow and the terrain too dry to allow for easier travel.

2. On April 30, 1864, the Battle of Camas Creek took place during the Civil War in Montana. Union forces clashed with Confederate sympathizers in the area near Deer Lodge. The Union forces emerged victorious in this skirmish.

3. In 1883, the city of Billings was founded on April 30th. It was named after Frederick H. Billings, a former president of the Northern Pacific Railway, which played a significant role in the city's growth and development.

4. On April 30, 1926, legendary baseball player and Hall of Famer, Willie Stargell was born in Earlsboro, Oklahoma. Stargell would later play for the Pittsburgh Pirates and is considered one of the greatest sluggers in baseball history.

5. In 1975, Montana's current state flag was adopted on April 30th. The flag features blue, white, and gold colors, a representation of the state's mountains and plains, and the state seal in the center. It was selected out of over 100 submissions in a contest held by the Montana Highway Commission.