What is Clear Lake Known For?

Quick Facts and Why You’re Probably Googling This

If you’ve ever found yourself wondering what is the largest lake in California, the answer isn’t quite as straightforward as you might think. Technically, the title goes to the Salton Sea. But if you’re talking natural lakes — the kind that didn’t need a dam or a water deal to exist — Clear Lake takes the crown.

It’s the largest natural freshwater lake entirely within California, covering about 68 square miles. And it’s not just big — it’s old. Geologists say it’s at least 2 million years old, which makes it one of the oldest lakes in North America. So if you’re picturing something like a dried-out pond with a catchy name, think again.

California has over 3,000 named lakes, and plenty more unnamed ones scattered through the Sierra, foothills, and desert basins. But in Northern California, Clear Lake stands out. Not just because of its size, but because it’s still relatively undeveloped compared to lakes like Tahoe or Shasta. It’s a local favorite that somehow never made it into the glossy travel brochures — which might just be part of the appeal.

Fishing and Recreation

If you’re into fishing, Clear Lake probably already lives rent-free in your head. It’s been called the bass capital of the West, and not just by the tourism board. Professional anglers and weekend warriors both flock here year-round, drawn by the lake’s shallow, weedy waters and healthy fish population.

There are bass tournaments all the time — some small and local, others big enough to bring in out-of-state pros. Largemouth bass is the star of the show, but crappie, catfish, and bluegill show up in numbers too.

Boaters, Swimmers, and Lazy Summer Days

Beyond the fishing scene, Clear Lake holds its own as one of the best California lakes for boating and water sports. There’s enough open water to keep wakeboarders happy, and plenty of quiet coves for kayakers who just want to paddle in peace.

As for swimming — yes, it’s one of the most popular lakes in Northern California for swimming, especially in summer. The water gets warm early in the season thanks to its shallow depth. Just know that water clarity can change with the weather, the algae, and the time of year. Sometimes it’s glassy and clear. Sometimes it’s more of a murky green. Welcome to nature.

Clear Lake State Park and the Outdoors

Clear Lake State Park sits on the western shore and makes a pretty ideal basecamp if you’re into sleeping under the stars — or at least near a working restroom. The park has multiple campgrounds, picnic areas, and easy shoreline access. Trails wind through oak woodlands and along the water, with views that feel more personal than postcard-perfect.

It’s not just a camping spot either. You’ve got room to kayak, fish from shore, spot birds (tons of them, especially in spring), and yes, swim. The park even has a designated swim beach and a sheltered lagoon, great for kids or anyone who doesn’t want to dodge jet skis.

Want to explore more? Check out our guide to 15 things to do in Clear Lake — from local trails to wine tasting and everything in between.

Warm Water, Volcanoes, and the Lake’s Unique Charm

One of the Warmest Lakes in California

One of the best things about Clear Lake is how warm the water gets. Thanks to underground geothermal activity, it’s actually one of the warmest lakes in California — which means no freezing shock when you step in. If you’re into early morning swims or lazy sunset floats, this place is a dream.

Unlike alpine lakes that stay icy well into summer, Clear Lake heats up fast and stays comfortable well into the fall. It’s especially nice for families and anyone who doesn’t feel like braving glacier water just to cool off.

Sulfur Springs and Shifting Colors

The lake also has a bit of character — and that includes a few natural sulfur springs along the shore. You might catch a faint earthy smell in certain spots, but it’s nothing dramatic, and most visitors don’t even notice after a few minutes. It’s part of what gives the area its quirky, almost spa-like vibe.

As for water clarity, or lake transparency, it changes with the seasons. Some days the lake is glassy and clear, especially in spring and early summer. Other times, a touch of algae rolls in, tinting the water green. Either way, the lake stays swimmable, paddle-friendly, and full of life year-round.

Why Is Clear Lake So Cheap?

If you’ve ever looked at a map and thought, “This lake is huge… why is real estate so cheap around here?” — you’re not alone. Clear Lake has long been one of the more affordable places to live or vacation in Northern California, especially when you compare it to Lake Tahoe or Shasta.

So why is it so cheap? Mainly because it’s still under the radar. It doesn’t have the same level of commercial development, and some of the towns around the lake are still growing into their potential. That keeps prices low — for now.

A Little Rough, A Lot of Charm

Some areas feel a bit quiet, even rough around the edges, while others are blooming with new energy. Places like Kelseyville and parts of Lakeport have that friendly, small-town vibe mixed with boutique wineries, good food, and easy access to the water.

That balance is what makes Clear Lake special. It’s not overcrowded. It’s not overpriced. And for those who know where to stay, it can feel like your own private corner of Northern California.

Final Thoughts: The Underrated Famous Lake in California

Clear Lake doesn’t always show up on the usual “best California lakes” lists — and honestly, that’s part of the appeal. It’s famous in its own way, especially among anglers, nature lovers, and folks who know the difference between crowded and peaceful.

It’s one of the few big-name lakes in California that still feels like a hidden spot. You can spend a weekend here without sitting in traffic or elbowing your way to the shoreline. The lake is huge, the pace is slow, and the scenery is real — not curated for a phone screen.

If you’re after fresh air, warm water, starry nights, and a sense of space, Clear Lake quietly checks all the boxes. It’s not trying to impress anyone — and that’s exactly why it does.

Images in the article: Courtesy of California State Parks, 2025