Idaho Falls, Idaho

Idaho Falls is the fourth most populous city in Idaho and the county seat of Bonneville County. It is the state's most populous city outside the Boise metropolitan area. As of the 2020 census, the population of Idaho Falls was 64,818. In the 2010 census, the population of Idaho Falls was 56,813 (2019 estimate: 62,888), with a metro population of 133,265.

Idaho Falls serves as the commercial, cultural, and healthcare hub for Eastern Idaho, as well as parts of western Wyoming and southern Montana. It is served by the Idaho Falls Regional Airport and is home to the College of Eastern Idaho, Museum of Idaho, Idaho Falls Idaho Temple, and the Idaho Falls Chukars baseball team of the Pioneer League. It is the principal city of the Idaho Falls Metropolitan Statistical Area and the Idaho Falls–Blackfoot-Rexburg, Idaho Combined Statistical Area.

The area around Idaho Falls was first sparsely settled by cattle and sheep ranchers. No significant development took place until 1864, when a man named Harry Rickets built and operated a ferry on the Snake River at 43°36.112′N 112°3.528′W / 43.601867°N 112.058800°W / 43.601867; -112.058800. The ferry served a new tide of westward migration and travel on the Montana Trail following the Bear River Massacre of Shoshone Indians in 1863.

The present-day site of Idaho Falls became a permanent settlement when freighter Matt Taylor built a timber-frame toll bridge across a narrow black basaltic gorge of the river 7 miles (11 km) downstream from the ferry. The bridge improved travel for settlers moving north and west, and for miners, freighters, and others seeking riches in the gold fields of Idaho and Montana –especially the boom towns of Bannack and Virginia City.

By the end of 1865, a private bank, small hotel, livery stable, eating house, post office, and stage station had sprung up near the bridge. The settlement was initially known as Taylor's Crossing, but postmarks indicate that by 1866, the emerging town had become known as Eagle Rock. The name was derived from an isolated basalt island in the river near the ferry, where approximately twenty eagles nested.

In 1874, water rights were established on nearby Willow Creek and the first grain was harvested. Settlement was sparse, and consisted of only a couple of families and small irrigation ditches. The first child of European descent was born at Eagle Rock in 1874.

Soon, the Utah and Northern Railway (U&NR) was built, stretching north from Utah through Eagle Rock and crossing the Snake River at the same narrow gorge as Taylor's bridge. The railway would eventually connect to the large new copper mines at Butte, Montana. The U&NR had the backing of robber baron Jay Gould, as Union Pacific Railroad had purchased it a few years prior. Grading crews reached Eagle Rock in late 1878, and by early 1879, a wild camp-town with dozens of tents and shanties had moved to Eagle Rock with a collection of saloons, dance halls, and gambling halls. The railroad company had 16 locomotives and 300 train cars working between Logan, Utah and the once-quiet stage stop. A new iron railroad bridge was fabricated in Athens, Pennsylvania at a cost of $30,000 and shipped by rail to the site, where it was erected in April and May 1879. The bridge was 800 feet (240 m) long and had two spans, with an island in the center. The camp-town moved on, but Eagle Rock now had regular train service and several U&NR buildings, shops, and facilities which expanded and transformed the town.

As soon as the railroad came through, settlers began homesteading the upper Snake River Valley in earnest. The first new settlers carved out homesteads to the north at Egin (near present-day Parker) and at Pooles Island (near present-day Menan). The Utah & Northern Railway provided easy access, especially to homesteaders from Utah, who soon populated much of the area surrounding Eagle Rock. Some of these men had initially worked building the railroad, then later returned with their families to stake out new farms. These Utah families brought irrigation know-how developed in Utah's Great Basin settlements. Through their and others' canal systems, water from the Snake River made the Upper Snake River Valley into one of the most successful irrigation projects in the Mountain West. Large-scale settlement ensued and within a decade, there appeared roads, bridges, and dams, which brought most of the Upper Snake River Valley under cultivation.