Sculpted by the
Santa Ana River and carved during the
Pleistocene Epoch,
mammoth,
bison, and
giant sloth fossils have been discovered in sedimentary deposits of an older marine terrace. Until 1862, the Newport Bay flowed directly into the
Pacific Ocean. The earliest human inhabitants lived in the bay some 9,000 years ago. The Bay was home to the
Tongva and
Acjachemen for thousands of years, who lived in nearby villages and mainly lived off fish, shellfish, and plants inhabiting the area. In the California mission period. The multiethnic village of
Genga held influence over the Bay area prior to the arrival of Europeans in the area. In the
California mission period, these villages declined from displacement and the area above the bay was used for grazing by cattle and sheep by the missionaries. In 1870, the steamwheel steamer "
Vaquero" gave
Newport its namesake after delivering loads of lumber in a "new port." Acquired by the
Irvine Company in 1864, the bay was used as a salt works from the 1930s up until 1969, when the land used for the salt works was destroyed by flooding. It was not until the 1960s that preservation of the Newport Back Bay began. The area included a section that began near where the Back Bay Science Center is currently located, where small boats were allowed to speed up to 35 miles per hour in a circular course of approximately 1/4 mile in length. After another 1/4 mile further, past Big Canyon, water skiing was permitted in a circular course; due to ten years of constant lawsuits, enacted by concerned citizens, the State of California Department of Fish and Game designated the undeveloped portions of the Upper Newport Bay as an ecological reserve. In the mid-1980s, Orange County incorporated the bluffs surrounding the bay to the ecological reserve. In 1989, Orange County accepted the 140-acre Upper Newport Bay Nature Preserve. ==Recreation==