The City of Lake Elsinore was founded in 1883 and incorporated on April 20, 1888. In 1893, the Elsinore Valley, previously in San Diego County, became a part of the new County of Riverside.
According to the United States Census Bureau, the city has a total area of 41.7 sq mi (108.0 km2) of which 36.2 sq mi (93.8 km2) of it is land and 5.5 sq mi (14.2 km2), or 13.14%, is covered by water.
Lake Elsinore, originally Laguna Grande, is the largest natural freshwater lake in Southern California and is situated at the lowest point within the 750-square-mile (1,900 km2) San Jacinto River watershed at the terminus of the San Jacinto River, where its headwaters are found on the western slopes of San Jacinto Peak with its North Fork, and Lake Hemet with its South Fork. Lake levels are healthy at 1,244 feet (379 m) above sea level with a volume of 30,000 acre⋅ft (37 Gl) that often fluctuate, although much has been done recently to prevent the lake from drying up, flooding, or becoming stagnant. At 1,255 feet (383 m), the lake would spill into the outflow channel on its northeastern shore, known properly as Temescal Wash, flowing northwest along I-15, which feeds Temescal Creek, which dumps into the Santa Ana River just northwest of the City of Corona. It then flows to Orange County, out to the Pacific Ocean just south of Huntington State Beach.
Lake Elsinore is bordered by the Elsinore Mountains to the west, which are a part of the larger Santa Ana Mountain Range, and receive a few inches of snowfall a few days each year. Included in the Santa Ana Mountains is the Cleveland National Forest and the community of El Cariso. Lake Elsinore is northwest of Wildomar and the northern portion is part of the Temescal Canyon. To the east of the lake are the much older and more eroded slopes of the Temescal Mountains.
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