'''ALTA LOMA'''

is one of three formerly unincorporated areas that became part of the city of Rancho Cucamonga, California, United States in 1977. The community is located in the foothills of the south face of the San Gabriel Mountain range, near Cucamonga Peak and Mount Baldy. It is located in the 91701 and 91737 zip codes. The latitude of Alta Loma is 34.122N. The longitude is -117.597W. Its lowest elevation is approximately Interwiki: convert » 1371|ft|m and extends to about Interwiki: convert » 3000|ft|m. The name comes from the Spanish, meaning "high hill." Alta Loma had previously been known as Iamosa.

GEOGRAPHY

Most of the homes in the foothills of Alta Loma and Etiwanda sit on alluvial fans punctuated by deep debris canyons. Some of these canyons are used for water collection and thus the area does not typically take water from the Colorado River.
Cucamonga Canyon in particular is a favorite among hikers, although dangerous due to the rough terrain, loose rocks, possible flooding, poison oak, bears, mountain lions, rattlesnakes, bobcats, and other wildlife. Far up the canyon are the Cucamonga Falls, which have occasionally caused contention between the city council, residents, and developers, due to developers wanting to build homes over the falls.Interwiki: Fact » date=November 2009
Several high voltage transmission lines cross the community's northern edge just at the base of the mountains creating an effective barrier to further development except in the case of the hills above Beryl Street, home to a former Christmas tree farm, which has been slated for development of sixty, $1 million homes across approximately Interwiki: convert » 300|acre|km2.
The Alta Loma area experiences high winds known in the Inland Empire and the rest of Southern California as the "Santa Ana Winds." Heavy rain storms in the past created the need for Interwiki: convert » 12|-|18|ft|m|adj=mid|-deep concrete flood control channels to prevent severe flooding that historically killed many people, including a young mother and her two children in 1981 at the intersection of Beryl and 19th Streets.
The northern parts of Alta Loma are also frequently visited by private planes, sometimes performing acrobatic stunts, using VFR.
Alta Loma rests on the Cucamonga-Sierra Madre earthquake fault. It is a thrust fault, meaning the sides of the fault push toward each other. Several other earthquake faults pass through the area, too.


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