Clear Lake Reservoir 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 ...

in the

Klamath Basin The Klamath Basin is the region in the U.S. states of Oregon and California drained by the Klamath River. It contains most of Klamath County and parts of Lake and Jackson counties in Oregon, and parts of Del Norte, Humboldt, Modoc, Siskiyou, ...

and the

Modoc National Forest Modoc National Forest is a National forest (United States), U.S. national forest in Northeastern California. Geography The Modoc National Forest protects parts of Modoc County, California, Modoc (82.9% of acreage), Lassen County, California, L ...

, in northwestern

Modoc County, California Modoc County () is a county (United States), county located in the far northeast corner of the U.S. state of California. Its population is 8,700 as of the 2020 census, down from 9,686 from the 2010 census. This makes it California's third-least ...

. It is part of the

Klamath Project The Klamath Project is a water-management project developed by the United States Bureau of Reclamation to supply farmers with irrigation water and farmland in the Klamath Basin. The project also supplies water to the Tule Lake National Wildli ...

. and about northwest of

Alturas Alturas (Spanish for "Heights"; Achumawi: ''Kasalektawi'') is the only incorporated city in Modoc County, California of which it is also the county seat. Located in the Shasta Cascade region of Northern California, the city had a population o ...

. It is formed by Clear Lake Dam on the Lost River, a tributary of the

Klamath River The Klamath River (Karuk language, Karuk: ''Ishkêesh'', Klamath language, Klamath: ''Koke'', Yurok language, Yurok: ''Hehlkeek 'We-Roy'') is a long river in southern Oregon and northern California. Beginning near Klamath Falls, Oregon, Klama ...

, and has a capacity of . The reservoir is not to be confused with Clear Lake, a large natural lake on Cache Creek in

Lake County, California Lake County is a County (United States), county located in the north central portion of the U.S. state of California. As of the 2020 United States census, 2020 census, the population was 68,163. The county seat is Lakeport, California, Lakepor ...

Clear Lake Dam

The original

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 constructed of rockfill and completed in 1910. It was tall from the bottom of the foundation to the crest, if measured from the crest to the original stream bed. It was replaced with a

concrete Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid over time. It is the second-most-used substance (after water), the most–widely used building material, and the most-manufactur ...

dam near the old dam in 2002. The old dam had deteriorated and the water level was kept low to prevent it from failing. Its crest is at the same height as the old dam and the reservoir's capacity is about the same. There is a small

hydroelectric Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

plant at the dam with a capacity of 3 MW. The dam is owned by the

United States Bureau of Reclamation The Bureau of Reclamation, formerly the United States Reclamation Service, is a federal agency under the U.S. Department of the Interior, which oversees water resource management, specifically as it applies to the oversight and operatio ...

. The dam and reservoir were created to reduce flows into the reclaimed wetlands of

Tule Lake Tule Lake ( ) is an intermittent lake covering an area of , long and across, in northeastern Siskiyou County and northwestern Modoc County in California, along the border with Oregon. Geography Tule Lake is fed by the Lost River. The ele ...

. It also reduces flows into Tule Lake Sumps in the

Tule Lake National Wildlife Refuge The Tule Lake National Wildlife Refuge is a National Wildlife Refuge of the United States in northern California near the Oregon border. It covers in the Tule Lake basin. It is part of the Klamath Basin National Wildlife Refuge Complex, and is ...

. The reservoir created by the dam has a very large surface area, 25,760 acres (104.2 km²), and its average depth at maximum capacity is only about 20 feet (6 m), so it has a very high rate of

evaporation Evaporation is a type of vaporization that occurs on the Interface (chemistry), surface of a liquid as it changes into the gas phase. A high concentration of the evaporating substance in the surrounding gas significantly slows down evapora ...

. In 1998, of water from the reservoir evaporated, more than any other lake in the state besides

Shasta Lake Shasta Lake, also popularly known as Lake Shasta, is a reservoir in Shasta County, California, United States. It began to store water in 1944 due to the impounding of the Sacramento River by Shasta Dam, the ninth-tallest dam in the US. Sh ...

, which has over 8 times the volume. Because of this, Clear Lake Reservoir is not an efficient water storage reservoir. This is a problem since the dam now provides 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 ...

in the eastern half of the

. The reservoir is in

and

Clear Lake National Wildlife Refuge Clear Lake National Wildlife Refuge is a National Wildlife Refuge of the United States in northeastern California. It includes about of open water surrounded by over of upland bunchgrass, low sagebrush, and juniper habitat. small, rocky island ...

, so recreation opportunities are limited.

References

California Department of Water Resources
(XLS) * {{small, (1.02

MiB The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable un ...

)
Herald News
Reservoirs in Modoc County, California Klamath River Modoc Plateau Modoc National Forest Dams in California Dams on the Klamath River Reservoirs in Northern California 1910 establishments in California

Clear Lake Dam

See also

References