Lopez Lake is a

reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

near the city of Arroyo Grande in

San Luis Obispo County, California San Luis Obispo County (), officially the County of San Luis Obispo, is a County (United States), county on the Central Coast of California. As of the 2020 United States census, the population was 282,424. The county seat is San Luis Obispo ...

. The lake is formed by Lopez Dam on Arroyo Grande Creek, upstream from the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

. The creek drains about above the dam and below. The

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aqua ...

was built in and is operated by the San Luis Obispo County Flood Control and Water Conservation District. The earth-fill dam was retrofitted to protect against

earthquake An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they ...

s between 2001 and 2003. The winter of 2022-2023 brought the reservoir to the capacity of . In March 2023 the lake overflowed into the spillway for the first time since 1998, some 25 years prior. Lopez Lake beach

Lopez Lake provides

drinking water Drinking water or potable water is water that is safe for ingestion, either when drunk directly in liquid form or consumed indirectly through food preparation. It is often (but not always) supplied through taps, in which case it is also calle ...

for Arroyo Grande,

Grover Beach Grover Beach is a city in San Luis Obispo County, California, United States. The population was 12,701 at the 2020 census, down from 13,156 in 2010. Grover Beach is the location of the Pacific Crossing 1 ( PC-1) cable landing station, where tra ...

Pismo Beach Pismo Beach (Chumashan languages, Chumash: ''Pismuʔ'') is a city in the southern portion of San Luis Obispo County, California, San Luis Obispo County, in the Central Coast (California), Central Coast area of California, United States. Its esti ...

Oceano Oceano (Spanish: ''Océano'', meaning "Ocean") is a census-designated place (CDP) in San Luis Obispo County, California, United States. The population was 7,183 at the 2020 census, down from 7,286 at the 2010 census. Geography Oceano is locat ...

and Avila Beach. It also provides

groundwater recharge Groundwater recharge or deep drainage or deep percolation is a hydrologic process, where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. This process usually occurs in ...

, water for

irrigation Irrigation (also referred to as watering of plants) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has bee ...

and

flood control Flood management or flood control are methods used to reduce or prevent the detrimental effects of flood waters. Flooding can be caused by a mix of both natural processes, such as extreme weather upstream, and human changes to waterbodies and ru ...

. Unlike most municipal water supplies, human contact with the water is permitted.

Sailing Sailing employs the wind—acting on sails, wingsails or kites—to propel a craft on the surface of the ''water'' (sailing ship, sailboat, raft, Windsurfing, windsurfer, or Kitesurfing, kitesurfer), on ''ice'' (iceboat) or on ''land'' (Land sa ...

wind surfing Windsurfing is a wind-propelled water sport that is a combination of sailing and surfing. It is also referred to as "sailboarding" and "boardsailing", and emerged in the late 1960s from the Californian aerospace and surf culture. Windsurfing gain ...

water skiing Water skiing (also waterskiing or water-skiing) is a surface water sport in which an individual is pulled behind a boat or a cable ski installation over a body of water, skimming the surface on one or two skis. The sport requires sufficien ...

swimming Swimming is the self-propulsion of a person through water, such as saltwater or freshwater environments, usually for recreation, sport, exercise, or survival. Swimmers achieve locomotion by coordinating limb and body movements to achieve hydrody ...

fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from the natural environment (Freshwater ecosystem, freshwater or Marine ecosystem, marine), but may also be caught from Fish stocking, stocked Body of water, ...

and

camping Camping is a form of outdoor recreation or outdoor education involving overnight stays with a basic temporary shelter such as a tent. Camping can also include a recreational vehicle, sheltered cabins, a permanent tent, a shelter such as a Bivy bag ...

are popular activities. There is also a waterslide next to the lake. To prevent contamination of the drinking water, water from the lake is piped to a terminal reservoir, where it remains to allow particles to settle out and

pathogen In biology, a pathogen (, "suffering", "passion" and , "producer of"), in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a Germ theory of d ...

s to die off. The water then goes through

flocculation In colloidal chemistry, flocculation is a process by which colloidal particles come out of Suspension (chemistry), suspension to sediment in the form of floc or flake, either spontaneously or due to the addition of a clarifying agent. The actio ...

filtration Filtration is a physical separation process that separates solid matter and fluid from a mixture using a ''filter medium'' that has a complex structure through which only the fluid can pass. Solid particles that cannot pass through the filte ...

and chlorination at the Lopez Water Treatment Plant. The recreation area consists of of open space, trails and camping areas. A network of equestrian, bike and hiking trails criss-cross the park which is primarily oak woodland and

coastal sage scrub Coastal sage scrub, also known as coastal scrub, CSS, or soft chaparral, is a low scrubland plant community of the California coastal sage and chaparral subecoregion, found in coastal California and northwestern coastal Baja California. It is ...

. The area is frequented by black bears, mountain lions, mule deer and a number of other small mammals. Several special events are held at the park yearly such as the Lopez Lake Trout Derby held in May, the California Polytechnic University Triathlon and the Scott Tinley Dirty Adventures Triathlon.

References

External links

* * {{authority control Arroyo Grande, California Reservoirs in San Luis Obispo County, California Reservoirs in California Reservoirs in Southern California

See also

References

External links