1. On September 28, 1935, the Civilian Conservation Corps (CCC) completed construction of the first fire lookout tower on Squaw Butte near Emmett, Idaho. The CCC was a federal program created during the Great Depression to provide employment for young, unemployed men and to conserve natural resources across the country.

2. In 1971, a magnitude 7.2 earthquake hit the Challis area of Idaho on September 28, killing two people and causing significant damage to buildings and roads. The earthquake was one of the largest ever recorded in the state, and its effects were felt as far away as Boise and Salt Lake City.

3. On September 28, 1864, skirmishes took place between U.S. Army soldiers and Shoshone warriors near present-day Montpelier, Idaho. The battles were part of the Bear River Massacre, in which the U.S. Army attacked a Shoshone winter camp in Utah, killing more than 200 people, mostly women and children.

4. Idaho celebrated its centennial on September 28, 1990, marking 100 years since the territory became a state. Festivities included a statewide torch relay, a picnic on the Capitol lawn in Boise, and the opening of the Idaho Centennial Trail, a hiking and horseback riding trail that spans the length of the state.

5. On September 28, 1918, the Spanish influenza epidemic reached Idaho, with the first cases reported in Boise and Nampa. The pandemic ultimately killed more than 2,000 people in the state and more than 50 million worldwide. Idaho implemented measures such as school closures, quarantines, and public health campaigns to try to contain the spread of the disease.