Clear Lake

CALIFORNIA


Lake Level
0.01 FEET
6/19/2021
Full Pool: 1,329.0
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Clear Lake News

BoatUS: Signing of Infrastructure Bill is Good for Recreational Boaters, Anglers

BoatUS News

Date: 11/15/2021

SPRINGFIELD, VA – With President Biden’s signing today of the $1.2 trillion bipartisan Infrastructure Investment and Jobs Act (IIJA), you may have mistakenly thought that only road, bridge, rail, power and water infrastructure, public transit, drinking and wastewater, high speed internet, environmental

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BoatUS Foundation and Berkley Celebrate Breakthrough Concepts in Fishing Line and Soft Bait Recycling: ‘Recast and Recycle’ Contest Winners Announced

BoatUS News

Date: 10/7/2021

ANNAPOLIS, Md., October 7, 2021 – Recycling old fishing line and soft baits into new products is labor-intensive, inefficient and simply, for many anglers, not easy to do. This hampers the ability to grow the volume of line and soft bait recycling in the U.S. However, three BoatUS Foundation and Berkley Recast

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A Top Choice of Boat Names Reflects the Times: BoatUS Announces Top 10 Boat Names for 2021

BoatUS News

Date: 7/18/2021

SPRINGFIELD, Va. – It’s been a tumultuous year for Americans, and getting away from it all on a recreational boat has given many the respite they’ve needed. With lives upended, some recreational boat owners have chosen to reflect on the times when selecting a name for their boat. “Social

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2020 U.S. Coast Guard Boating Safety Report Reveals How the Pandemic Affected Boating

BoatUS News

Date: 7/16/2021

A Dive Into the 2020 U.S. Coast Guard Boating Safety Statistics Reveal How the Pandemic Affected Boating in Ways Just Beginning to be Understood ANNAPOLIS, Md., July 16, 2021 – The U.S. Coast Guard recently released the 2020 Recreational Boating Statistics, and reports of accidents, fatalities and injuries were

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A Barometer of the Times, Social Distancing Takes No. 2 Spot in BoatUS Top 10 Boat Names for 2021

BoatUS News

Date: 7/1/2021

SPRINGFIELD, Va., June 29, 2021 – It’s been a tumultuous year for Americans, and getting away from it all on a recreational boat has given many the respite they’ve needed. With lives upended, some recreational boat owners have chosen to reflect on the times when selecting a name for their boat

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• River: Cache
• Length: 100 Miles
• Surface Area: 43,520 Acres
• Volume: 1,155,000 Acre Feet
• Average Depth: 27 Feet
• Maximum Depth: 60 feet
• Length: 19 Miles
Clear Lake is a natural freshwater lake in Lake County in the U.S. state of California, north of Napa County and San Francisco. It is the largest natural freshwater lake wholly within the state, with 68 square miles of surface area. At an age of 2.5 million years, it is the oldest lake in North America. It is the latest lake to occupy a site with a history of lakes stretching back at least 2,500,000 years.

The expansive, warm water of Clear Lake makes it popular for watersports, such as swimming, water skiing, wakeboarding, sailing, boat races, and jet skiing.

The California Office of Environmental Health Hazard Assessment has issued a safety advisory for any fish caught in Clear Lake due to elevated levels of mercury.

Clear Lake is 19 miles by 8 miles at its widest point, with a surface area of 43,785 acres and a 1,155,000 acre?feet capacity. Average depth is 27 feet, maximum is 60 ft, lake elevation is 1,329 feet, and average water temperature is 40 °F (4 °C) in winter and 76 °F (24 °C) in summer.

Clear Lake is believed to be one of the oldest lakes in North America. The lake sits on a huge block of stone which slowly tilts northward at the same rate as the lake fills in with sediment, thus keeping the water at roughly the same depth. Core samples of the lake's sediments, taken by U.S. Geological Survey geologists in 1973 and 1980, indicate that the lake is at least 480,000 years old. Some experts feel that Mono Lake, to the east of the Sierra Nevada in California, is older than Clear Lake. However, the sedimentary history of Clear Lake is unbroken, while Mono Lake's sediments have been disturbed by past eruptions of the Long Valley Caldera and associated volcanoes.

At one time Clear Lake was even bigger than it is now, and included the Blue Lakes (to the northwest of Clear Lake). Volcanic eruptions and subsequent landslides changed the landscape dramatically, forever separating Clear Lake from the Blue Lakes and from its former westward drainage into the Russian River.

Clear Lake lies within the Clear Lake Volcanic Field, as designated by the United States Geological Survey. The volcanic field contains The Geysers, a steam field which powers a network of the world’s most productive geothermal power plants. There are numerous small faults present in the south end of the lake as well as many volcanoes, ranging in age from 10,000 to 2.1 million years, the largest being Mount Konocti, sitting at the middle of the lake's south shore. There have been no eruptions from the Clear Lake Volcanic Field for thousands of years, but there are indicators currently being monitored that suggest there is the potential for future eruptions. These indicators include volcanic-type earthquakes, hot spring activity and seepage of volcanic gas.
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