The Mad River Slough lies within Arcata Bay in the northern half of Humboldt Bay, about 100 miles south of the Oregon border. Arcata Bay is the northern portion of Humboldt Bay, divided from the southern section by Highway 101. The slough provides easy access for paddlers and offers several miles of pristine waterways, as the Mad River was diverted into Humboldt Bay during the logging era.

The slough retains a serene, timeless quality, allowing visitors to experience the world as they did in childhood, with a slower pace and abundant birds and wildlife. Birdwatchers flock to the Mad River Slough, which is home to over 150 species, including hawks, kestrels, shorebirds, ducks, and geese. Wildlife sightings abound around every bend, with the sounds of crashing waves from the nearby Pacific Ocean.

Anglers can also find success in the waters of Arcata Bay, where Pacific and California halibut thrive, particularly around the piers with sandy bottoms. The best time to fish for halibut is on the incoming tide, about two hours before high tide.

There are no camping facilities at the Mad River Slough. If you’re looking for somewhere to stay over night, camping is available at the Samoa Dunes Boat Launch and Campground.

Map of the Mad RIver Slough

  
 
 
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