Humboldt Lagoons State Park, established in 1931 on California’s Redwood Coast in Humboldt County, preserves 2,256 acres of coastal lagoons, estuaries, and wetlands along U.S. Route 101 between Trinidad and Orick. Its three main lagoons—Big, Stone, and Freshwater—are shallow bays separated from the Pacific by sandy bars built by wave action. The lagoons form an important resting place for migratory waterfowl along the Pacific Flyway and belong to a broader chain of North Coast wetlands. The area also reflects long-term geological change tied to Cascadia tectonic activity, while Dry Lagoon preserves more natural lowland conditions than nearby landscapes altered by industry and agriculture.