An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environments and are an example of an ecotone. Estuaries are subject both to marine influences such as tides, waves, and the influx of saline water, and to fluvial influences such as flows of freshwater and sediment. The mixing of seawater and freshwater provides high levels of nutrients both in the water column and in sediment, making estuaries among the most productive natural habitats in the world.
Humboldt County is a county in the U.S. state of California. As of the 2020 census, the population was 136,463. The county seat is Eureka.
Arcata is a city adjacent to the Arcata Bay (northern) portion of Humboldt Bay in Humboldt County, California, United States. At the 2020 census, Arcata's population was 18,857. Arcata was first settled in 1850 as Union, was officially established in 1858, and was renamed Arcata in 1860. It is located 280 miles (450 km) north of San Francisco, and is home to California State Polytechnic University, Humboldt. Arcata is also the location of the Arcata Field Office of the Federal Bureau of Land Management, which is responsible for the administration of natural resources, lands and mineral programs, including the Headwaters Forest, on approximately 200,000 acres (810 km2) of public land in Northwestern California.
Eureka is the principal city and county seat of Humboldt County in the Redwood Empire region of California. The city is located on U.S. Route 101 on the shores of Humboldt Bay, 270 miles (435 km) north of San Francisco and 100 miles (161 km) south of the Oregon border. At the 2010 census, the population of the city was 27,191, and the population of Greater Eureka was 45,034.
Barrier islands are coastal landforms and a type of dune system that are exceptionally flat or lumpy areas of sand that form by wave and tidal action parallel to the mainland coast. They usually occur in chains, consisting of anything from a few islands to more than a dozen. They are subject to change during storms and other action, but absorb energy and protect the coastlines and create areas of protected waters where wetlands may flourish. A barrier chain may extend uninterrupted for over a hundred kilometers, excepting the tidal inlets that separate the islands, the longest and widest being Padre Island of Texas. Sometimes an important inlet may close permanently, transforming an island into a peninsula, thus creating a barrier peninsula. The length and width of barriers and overall morphology of barrier coasts are related to parameters including tidal range, wave energy, sediment supply, sea-level trends, and basement controls. The amount of vegetation on the barrier has a large impact on the height and evolution of the island.
The Redwood National and State Parks (RNSP) are a complex of one national park and three state parks, cooperatively managed, located in the United States along the coast of northern California. Comprising Redwood National Park and California's State Parks: Del Norte Coast, Jedediah Smith, and Prairie Creek, the combined RNSP contain 139,000 acres (560 km2), and feature old-growth temperate rainforests. Located within Del Norte and Humboldt Counties, the four parks, together, protect 45 percent of all remaining coast redwood old-growth forests, totaling at least 38,982 acres (157.75 km2). These trees are the tallest, among the oldest, and one of the most massive tree species on Earth. In addition to the redwood forests, the parks preserve other indigenous flora, fauna, grassland prairie, cultural resources, portions of rivers and other streams, and 37 miles (60 km) of pristine coastline.
Humboldt Bay is a natural bay and a multi-basin, bar-built coastal lagoon located on the rugged North Coast of California, entirely within Humboldt County, United States. It is the largest protected body of water on the West Coast between San Francisco Bay and Puget Sound, the second-largest enclosed bay in California, and the largest port between San Francisco and Coos Bay, Oregon. The largest city adjoining the bay is Eureka, the regional center and county seat of Humboldt County, followed by the city of Arcata. These primary cities, together with adjoining unincorporated communities and several small towns, comprise a Humboldt Bay Area total population of nearly 80,000 people. This comprises nearly 60% of the population of Humboldt County. The bay is home to more than 100 plant species, 300 invertebrate species, 100 fish species, and 200 bird species. In addition, the bay and its complex system of marshes and grasses support hundreds of thousands of migrating and local shore birds. Commercially, this second-largest estuary in California is the site of the largest oyster production operations on the West Coast, producing more than half of all oysters farmed in California.
Humboldt Lagoons State Park is on the California coast on the Pacific Ocean, in Humboldt County, Northwestern California. The California state park protects three lagoons with estuaries and wetlands. It is located off U.S. Route 101 between Eureka, and the border with Oregon.
Ballona Wetlands State Ecological Reserve is a protected area located in Los Angeles County, California, just south of Marina del Rey and east of Playa del Rey. The natural wetlands once included the areas now taken up by Marina del Rey, New Amsterdam Canals of Venice, Playa Vista, northern Playa del Rey, and formerly extended northerly beyond Venice Boulevard to the historical Venice Canals that are now covered in asphalt with 6 streets.
U.S. Route 101 (US 101) is a major north–south United States Numbered Highway, stretching from Los Angeles, California to Tumwater, Washington. The California portion of US 101 is one of the last remaining and longest U.S. Routes still active in the state, and the longest highway of any kind in California. US 101 was also one of the original national routes established in 1926. Significant portions of US 101 between the Los Angeles area and the San Francisco Bay Area follow El Camino Real, the commemorative route connecting the former Alta California's 21 missions.
Prairie Creek Redwoods State Park is a state park, located in Humboldt County, California, near the town of Orick and 50 miles (80 km) north of Eureka. The 14,000 acre (57 km²) park is a coastal sanctuary for old-growth Coast Redwood trees.
Redwood Creek is a 61.8-mile (99.5 km) river in Humboldt County, California. The river's headwaters are in the Coast Range at about 5,000 feet (1,500 m) and it flows roughly northwest until it empties into the Pacific Ocean near the small town of Orick, the only development in the 280-square-mile (730 km2)-watershed.
Elkhorn Slough is a 7-mile-long (11 km) tidal slough and estuary on Monterey Bay in Monterey County, California. It is California's second largest estuary and the United States' first estuarine sanctuary. The community of Moss Landing and the Moss Landing Power Plant are located at the mouth of the slough on the bay.
Samoa is a census-designated place in Humboldt County, California. It is located 1.5 miles (2.4 km) northwest of Eureka, at an elevation of 23 feet. Samoa is located in the northern peninsula of Humboldt Bay and is the site of the Samoa Cookhouse, one of the last remaining original, lumber style cookhouses. The name Samoa is used interchangeably with the peninsula it occupies. The population was 258 at the 2010 census.
Lake Earl is a lagoon on the extreme northern California coast, just south of the Oregon border. A navigable body of water, it lies partly within Tolowa Dunes State Park and partly within Lake Earl Wildlife Area in Del Norte County, California and the third-most important seabird area on the West Coast after the Farallons and the Channel Islands.
Sue-meg State Park is 25 miles (40 km) north of Eureka, California in the heart of the coast redwood country. Previously named Patrick's Point State Park, Sue-meg is the original place name used by the Yurok people.
Los Peñasquitos Marsh Natural Preserve and Lagoon is a coastal marsh in San Diego County, California, United States situated at the northern edge of the City of San Diego, forming the natural border with Del Mar, California. This bar-built estuary, previously called The Soledad Lagoon, divides a colony of the endangered Pinus torreyana on a narrow coastal strip. Three streams empty into the lagoon: Carroll Creek, Carmel Creek, Los Peñasquitos Creek with a total drainage basin area of 95 square miles.
Orick is a census-designated place situated on the banks of the Redwood Creek in Humboldt County, California. It is located 43 miles (69 km) north of Eureka, at an elevation of 26 feet. The population was 357 at the 2010 census.
Freshwater Lagoon is the northernmost and smallest of three similar lagoons within Humboldt Lagoons State Park, along the coast of Humboldt County, California.
Big Lagoon is the southernmost and largest of three similar lagoons within Humboldt Lagoons State Park, along the coast of Humboldt County, California.
