A small band of Serrano Indians were the first inhabitants of the area near the Cajon Basin River, in an area bounded by route 66 on the south and Baseline on the North.....Artifacts discovered by archaeologist suggest that the city of Rialto was settled prior to the year 1500.....Such artifacts, now found at the Rialto Historical Society, indicate that the Serrano Indians lived in the Rialto area between 1500 and 1800....They most likely broke off from the Serrano's that lived on the Northern Deserts and in the deep creek area for hundreds of years.....No trace was left behind to suggest what happened to this small group of people, but it is believed that because the tribe was so small that they were either absorbed into the Cahuilla's, just before Spanish Mercenaries discovered the valley, or perhaps killed off by the Mormons after they settled in the San Bernardino area....No one is sure....After all the tribe only numbered around 40 when they were first discovered.....So it would not be to hard for this band to disappear into the night and never be seen again.

In addition to freeway projects, Measure I provides funds for major street improvements throughout the San Bernardino Valley. These funds are used for major rehabilitation, construction or reconstruction of main thoroughfares, also called arterial streets. A Measure I Arterial Program Five Year Plan is adopted each year to allocate funds for these streets.