California has a secret bay bigger than you’d believe and it dodged discovery for centuries

Fog kept this place a secret

Humboldt Bay sits on California’s North Coast, 270 miles north of San Francisco, and for hundreds of years, nobody sailing past it even knew it was there.

The entrance is narrow, and fog rolls in so thick that European ships missed it entirely until 1849.

Today, the bay sprawls across Humboldt County as California’s second-largest natural bay, with the cities of Eureka and Arcata anchoring about 80,000 people around its shores.

Eureka alone is the biggest coastal city between San Francisco and Portland. What took so long to find now takes a lifetime to explore.

Over a thousand years of Wiyot history

Long before any European ship came close, the Wiyot people lived along this bay.

They called it Wigi, and their homeland stretched about 36 miles along the lower Mad River, Humboldt Bay and lower Eel River, roughly 15 miles wide.

Sustained European contact did not come until 1849, when Josiah Gregg traveled overland and reached the water. Lumber mills followed fast.

By 1853, nine mills on Humboldt Bay shipped 20 million board feet of lumber south to San Francisco, and the bay’s quiet days ended for good.

A lumber baron built the fanciest house in America

Old Town Eureka still looks like it did during the lumber boom, with block after block of preserved Victorian buildings lining the streets.

The crown of the whole district is the Carson Mansion, built between 1884 and 1886. Lumber baron William Carson paid for it partly to keep 100 workers employed during a timber slump.

Architects Samuel and Joseph Newsom blended Queen Anne, Eastlake, Italianate and Stick styles into one house. Across the street sits the Pink Lady, a Queen Anne home Carson gave his son as a wedding gift in 1889.

You can photograph both from the sidewalk, but neither is open for tours.

The countrys oldest passenger vessel still runs

The M.V. Madaket hit the water in 1910 and never stopped. It started as a ferry hauling mill workers across Humboldt Bay, and it is the last one standing out of seven ferries that once worked these waters.

When the Samoa Bridge went up in 1972, the Madaket switched over to harbor cruises. You can ride it today on a 75-minute narrated trip that covers 8.5 miles along the Eureka waterfront, with stories about the bay’s wildlife, history and maritime past the whole way.

A sewage plant that became a birding destination

The Arcata Marsh and Wildlife Sanctuary covers 307 acres at the north end of Humboldt Bay, right along the Pacific Flyway.

That means thousands of birds pass through here every year moving between the Arctic and Central and South America. More than 300 species have shown up on the count.

The catch is that this place also works as a wastewater treatment system, filtering water through natural wetland processes. That innovation won an award from the Ford Foundation and Harvard Kennedy School.

Over five miles of trails wind through the marsh, and you can join free guided walks every Saturday.

100,000 birds show up every winter

The Humboldt Bay National Wildlife Refuge stretches nearly 5,000 acres across mudflats, salt marsh, freshwater wetlands, coastal dunes and forest.

The federal government set it up in 1971 to protect habitat for migratory birds, and more than 200 species use it, with at least 80 types of water birds in the mix. In winter, over 100,000 birds rest and feed around the bay.

The biggest story here is the Aleutian cackling goose, which dropped below 800 birds in 1974 and has climbed back to more than 120,000 today.

You walk 100 feet above the forest floor

The Redwood Sky Walk at Sequoia Park Zoo lifts you more than 100 feet off the ground and runs nearly a quarter mile through old-growth and mature second-growth redwoods. It is the longest sky walk in the western United States.

You cross suspended bridges and stand on tree platforms while the canopy rises an average of 250 feet around you, in what many believe is the tallest urban forest on the planet.

Most of the walkway meets ADA standards, with an optional adventure section that uses open mesh decking for anyone who wants a little more thrill.

California’s oldest zoo sits inside a redwood grove

Sequoia Park Zoo opened in 1907, making it the oldest accredited zoo in the state. The zoo covers seven acres inside a 60-acre park filled with towering redwoods.

You can see more than 150 animals from over 50 species here, including red pandas, river otters, bald eagles and flamingos. Your admission also gets you onto the Redwood Sky Walk.

In 2023, USA Today readers voted the Sky Walk the number one Aerial Adventure Park in the country, so plan to spend some time up in the canopy.

Half of California’s oysters grow right here

Humboldt Bay produces more than half of all oysters farmed in California.

The industry took off in the 1950’s when growers brought Pacific oyster seed to the bay, and the cool, nutrient-rich water turned out to be a perfect fit, especially for Kumamoto oysters.

You can take a guided boat tour to a working oyster farm and eat them straight off the water. Every summer, the Oyster Festival in Arcata brings the whole community out to celebrate the bay’s shellfish heritage.

6.5 miles of waterfront trail and open bay

The Eureka Waterfront Trail runs 6.5 miles along Humboldt Bay, passing through salt marshes, sand dunes and waterfront stretches.

Interpretive signs along the way tell you about the region’s natural and cultural history. If you want to get on the water, you can rent kayaks and paddleboards at Woodley Island Marina.

Paddlers often loop around Tuluwat Island to see the egret rookery or follow water trails through the wildlife refuge.

The bay also stays open to fishing year-round for halibut, Dungeness crab, sharks and starry flounder.

Dairy money built a Victorian village frozen in time

About 20 minutes south of Eureka, the village of Ferndale sits right where it has been since 1852. The entire town holds a spot on the National Register of Historic Places.

The Victorian buildings here go by the name Butterfat Palaces because dairy money built them.

Down Main Street, you walk past art galleries, antique shops and specialty stores, all inside preserved 19th-century buildings.

The National Trust for Historic Preservation has called Ferndale a distinctive destination, and the Ferndale Museum keeps artifacts and exhibits from the town’s Victorian years.

A working waterfront with murals and a Victorian mill

Humboldt Bay holds the only deep-water port between San Francisco and Coos Bay, Ore. Commercial fishing boats and oyster operations still work the water here every day.

On shore, local artists have painted murals across buildings throughout Eureka, and you can follow a self-guided tour to see them all.

The Clarke Museum in Old Town holds one of the largest Native American tribal collections in Northern California.

Over at Blue Ox Millworks, craftsmen use traditional Victorian-era methods to cut wood and restore historic buildings, and you can watch them work.

Explore Humboldt Bay in California

You can reach Humboldt Bay by driving about 270 miles north of San Francisco along Highway 101. Temperatures stay between 45 and 65 degrees most of the year, so bring layers no matter when you visit.

The Humboldt Bay National Wildlife Refuge Visitor Center sits at 1020 Ranch Road in Loleta, open daily from 8 a.m. to 5 p.m. Admission to the refuge is free.

Redwood National and State Parks, the Avenue of the Giants and the Lost Coast are all nearby, so you can easily build out a longer trip from this one bay.

This article was created with AI assistance and human editing.

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