1. In 1986, the Teton Dam in eastern Idaho collapsed, causing a catastrophic flood that killed 11 people and caused extensive damage to the surrounding areas. The dam's failure was attributed to design and construction flaws.

2. On June 16, 1925, a powerful earthquake struck the Borah Peak region of central Idaho, causing extensive damage and killing at least 11 people. The quake, which measured 7.3 on the Richter scale, remains the largest ever recorded in the state.

3. In 1806, explorer Meriwether Lewis passed through Idaho on his return journey from the Pacific Northwest, having explored the western half of the continent with William Clark during the famous Lewis and Clark Expedition.

4. On June 16, 1899, the first official automobile race in Idaho took place in the city of Coeur d'Alene. The event, which was organized by the Coeur d'Alene Press, featured three cars and was won by the driver of a steam-powered vehicle.

5. Idaho was admitted as the 43rd state in the Union on July 3, 1890, after years of territorial status under the control of the federal government. June 16th marks an important milestone in the state's journey towards statehood, as it was on this date in 1880 that Idaho's first constitutional convention was held in Boise.