1. On August 13, 1895, construction of the Roosevelt Dam began. This important dam project helped to control flooding and provide irrigation to the surrounding areas. It was named after President Theodore Roosevelt, who was a strong advocate for conservation and the development of water resources in the American West.

2. August 13, 1964, was the day that Congress passed the Wilderness Act, which protected over 9 million acres of land in Arizona as part of the National Wilderness Preservation System. This law played an important role in the conservation and preservation of wilderness areas throughout the country.

3. In 1989, on August 13th, a devastating flood swept through Phoenix, causing significant damage to homes, businesses, and infrastructure. The flood was caused by heavy rainfall and inadequate drainage systems. The disaster led to significant improvements in flood control and emergency response systems in the city.

4. August 13, 1999, was the day that the Havasu National Wildlife Refuge was established in Arizona. This protected area is home to over 318 species of birds, as well as many other native plants and animals. The refuge provides an important habitat for migratory birds and helps to preserve the natural beauty of the Colorado River region.

5. August 13, 2012, marked the opening of the Phoenix Light Rail, a modern public transportation system that serves the city of Phoenix and the surrounding areas. This system has helped to reduce traffic congestion and air pollution in the region, and has provided residents with a convenient and affordable way to get around the city.