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Foster was a settlement in east San Diego County, California. It was located approximately 3.5 miles (5.6 km) north of Lakeside, near the present-day location of the San Vicente Dam. It was the terminus of the San Diego, Cuyamaca, and Eastern Railroad from 1889, when the railroad reached the town, until 1916, when parts of the railway between Lakeside and Foster were damaged by floods. The line was never rebuilt and the town declined thereafter. There were 7 buildings in Foster in 1891–93, according to the 1893 USGS survey map. A road connecting Lakeside to Ramona and Julian ran through Foster until 1942, when the section just north of Foster was submerged to create San Vicente Reservoir and the road was rerouted further west, bypassing the settlement. The town was named after local rancher Joseph Foster.

The San Vicente Dam is a concrete gravity dam on San Vicente Creek near Lakeside and 25 km (15.5 mi) northeast of San Diego, California. The dam was built between 1941 and 1943 and created San Vicente Reservoir for the purpose of municipal water storage, flood control and recreation. Although the reservoir is fed by run-off, its main source is the First San Diego Aqueduct. In June 2009, construction to raise the height of the dam by 117 ft (36 m), in order to more than double its reservoir size, commenced. It is the largest dam raise in the United States and largest roller-compacted concrete dam raise in the world. The dam raise project was originally set for the end of 2012, but was completed in early 2014. Efforts to replace the water supply pipelines and prepare the reservoir for the public will be underway until 2015–2017.

San Vicente Reservoir is a reservoir created by the San Vicente Dam in San Diego County, California. It is located in the Cuyamaca Mountains, approximately 4.3 miles (6.9 km) north of Lakeside off California State Route 67.

Eucalyptus Hills is a census-designated place in the East County region of San Diego County, California. Eucalyptus Hills sits at an elevation of 627 feet (191 m). The 2020 United States census reported Eucalyptus Hills's population as 5,517, up from 5,313 in the 2010 census.

El Capitan High School (commonly known as El Cap) is a public high school in Lakeside, California, United States, a census-designated place in San Diego, and serves students in grades nine through twelve. Opened in 1959, El Capitan is the fifth of twelve high schools to be constructed in the Grossmont Union High School District. El Capitan High School is accredited by the Western Association of Schools and Colleges.

Los Coches Creek is a 9.4-mile-long (15.1 km) tributary of the San Diego River in southern San Diego County, California.It has its source 3 miles east of the community of Flinn Springs and El Cajon. It flows west through the former Rancho Cañada de los Coches area, then turns northwest to its confluence with the San Diego River.

River Valley Charter School is a charter junior high/high school established in 1996 in Lakeside, California. It is a part of the Lakeside Union School District, LUSD. It is based on a partial-independent study program, in which most students attend two class days per week. As much as 50% of the River Valley students come from home-school backgrounds. River Valley has been fully accredited by the Western Association of Schools and Colleges since 2002.

Lakeside is a census-designated place (CDP) in the East County region of San Diego County, California. The population was 21,152 at the 2020 census, up from 20,648 as of the 2010 census.

Silverwood Wildlife Sanctuary is a nature preserve owned and operated by the San Diego Audubon Society (SDAS). Silverwood was set up in 1965 to preserve coastal chaparral and riparian woodland habitats. It is also a nature education facility for San Diego area schoolchildren and adults, and functions as part of a wildlife migration corridor.

Santee is a suburban city in San Diego County, California, with a population of 60,037 at the 2020 census. Although it is a part of the East County region, Santee is located just 18 miles (29 km) from the Pacific Ocean. The city is connected to the coastline by State Route 52, a six-lane freeway that runs from Interstate 5 in La Jolla to State Route 67 in El Cajon. The city is bisected by the San Diego River, a linear greenbelt that includes parks, trails and more than 1,100 acres (450 ha) of natural riparian habitat.

Lake Jennings is a water supply reservoir in San Diego County, California. It is located in Lakeside, Ca.

Santana High School, located in Santee, California, is part of the Grossmont Union High School District.