Irvine borders
Tustin to the north,
Santa Ana to the northwest,
Lake Forest to the east and southeast,
Laguna Hills and
Laguna Woods to the south,
Costa Mesa to the west, and
Newport Beach to the southwest. Irvine also shares a small border with
Orange to the north on open lands by the
SR 261.
San Diego Creek, which flows northwest into
Upper Newport Bay, is the primary watercourse draining the city. Its largest tributary is
Peters Canyon Wash. Most of Irvine is in a broad, flat valley between Loma Ridge in the north and
San Joaquin Hills in the south. In the extreme northern and southern areas, however, are several hills, plateaus and canyons.
Planned city Los Angeles architect William Pereira and Irvine Company employee
Raymond Watson designed Irvine's layout beginning in the late 1950s, which is nominally divided into townships called "villages", separated by six-lane
arterial roads. Each township contains houses of similar design, along with commercial centers, religious institutions, and schools. Commercial districts are checker-boarded in a periphery around the central townships. Only automobile transportation was planned for, with other forms of transportation ignored, resulting in Irvine becoming extremely
car dependent today. Pereira originally envisioned the university campus at the northern end of the Irvine Ranch. When the Irvine Company refused to relinquish valuable farmland in the flat central region of the ranch for this plan, the university site was moved to the base of the
southern coastal hills. The city layout was based on the shape of a necklace (with the villages strung along two parallel main streets, which terminate at
University of California, Irvine (UCI), the "pendant"). Residential areas are now bordered by two commercial districts, the
Irvine Business Complex to the west (part of the
South Coast Plaza–John Wayne Airport edge city) and
Irvine Spectrum to the east. All streets have
landscaping allowances. Rights-of-way for powerlines also serve as bicycle corridors, parks, and greenbelts to tie together ecological preserves. The city irrigates the greenery with reclaimed water. The
homeowners' associations which govern some village neighborhoods exercise varying degrees of control on the appearances of homes. In more restrictive areas, houses' roofing, paint colors, and landscaping are regulated. Older parts of the Village of Northwood that were developed beginning in the early 1970s independently of the Irvine Company and does not have homeowners' associations.The more tightly regulated villages generally offer more amenities, such as members-only swimming pools, tennis courts and parks. Homeowners in villages developed in the 1980s and later may be levied a
Mello-Roos special tax, which came about in the post-
Proposition 13 era.
Villages Each of the villages was initially planned to have a distinct architectural theme. • El Camino Glen • • The Colony • Columbus Grove • Cypress Village • Deerfield (mixed styles) • East Irvine • El Camino Real (Spanish/Neo-Eclectic) • Greentree • Irvine Groves • Harvard Square • Heritage Fields • Laguna Altura • Lambert Ranch • Northpark (French Country, Formal French, Italian Country, Formal Italian, Monterey and Spanish Colonial) • Northpark Square (Spanish Mission) •
Northwood (Bungalow, Craftsman) • Oak Creek (mixed styles) • Old Towne Irvine • Orangetree •
Orchard Hills (Rural Craftsman/Spanish/Tuscan) • Park Lane • Parkcrest • Parkside • Pavilion Park •
Portola Springs (Spanish/Tuscan) • Planning Area 40 (Future Village) •
Quail Hill (Spanish/Tuscan) • Racquet Club • The Ranch • Rancho San Joaquin (
Shed style) • Rosegate (Spanish/Tuscan) • San Marino (Spanish/Tuscan) • Stonegate (Spanish) • Shady Canyon (Tuscan Ranch) • Turtle Ridge (Tuscan) •
Turtle Rock (mixed styles) •
University Hills •
University Park (California Modern) • University Town Center (mixed styles) • Walnut (Prairie Style) • West Irvine (California Modern) • Westpark (Italian Riviera/Mediterranean) • The Willows • Windwood •
Woodbridge (Atlantic Coast) • Woodbury (Tuscan/Spanish/French) • Woodbury East (Spanish) Business and commercial areas •
Irvine Business Complex •
Irvine Spectrum (Contemporary/Moroccan) •
Old Town Irvine Climate Late spring and early summer in Irvine is subject to the
June Gloom phenomenon widespread in southern California, with overcast mornings and occasional drizzle. Late summer and autumn are warm and mostly dry, with occasional bouts of humid weather extending from
Pacific hurricanes off the west coast of Mexico. Winters are mild, with most winters having no frost, and can be hot and dry when the
Santa Ana winds blow. Irvine has a
Mediterranean climate wherein
precipitation occurs predominantly during the winter months. Because Irvine is close to the coast, different parts of Irvine have different
microclimates; for instance, the June Gloom effect is stronger in the southern parts of Irvine, closer to the Pacific Ocean. It can occasionally snow in the
Santa Ana Mountains to the northeast of Irvine. Snow within the lower-lying parts of Irvine is very rare, but the area received three inches of snow in January 1949. A
tornado touched down in Irvine in 1991, an event that happens in Orange County more generally approximately once every five years. ==Demographics==