Umpqua Beach is in the Oregon Dunes National Recreation Area that extends for about 35 miles (56 km) along the coast from the Siuslaw River at Florence in the north to the Coos River in the south at North Bend, Oregon. The beach provides public access to an off-highway vehicle staging area south of the Umpqua River mouth. It encompasses the largest expanse of coastal aeolian dunes in North America, some reaching 500 feet (150 m) above sea level. The sand derives from the erosion of bedrock in the Coast Range, mostly sedimentary rock that formed on the ocean floor, was uplifted 12 million years ago, and began weathering. Rock fragments move downhill by gravity, reaching rivers where tumbling and abrasion break them into sand, which is then transported to the coast. Dunes form where the shoreline is flat and wide, sand supply is large and consistent, and winds blow onshore. Waves carry suspended sand into energetic surf zones, run up the beach slope, lose energy, and deposit their load. Onshore winds then carry finer grains up the beach face and inland, where obstacles such as vegetation or fences slow the wind and trigger deposition. Dune height reflects the balance between wind-driven building and erosion during storms. The present shoreline stabilized about 6,000 years ago.

The central Oregon coast is the traditional territory of the Siuslaw and Kuitsh, closely related peoples whose ancestors have inhabited the area for thousands of years—possibly as long as 10,000. The Siuslaw lived mainly around the Siuslaw River estuary, moving upriver and into the Coast Range hills in summer. The Kuitsh wintered around Winchester Bay, at the mouth of the Umpqua River. Their semi-subterranean plank houses, up to 50 feet (15 m) long, were built of split and smoothed cedar; the gabled roof had a single ridgepole. Ceiling racks stored dried food, baskets, tools, and possessions, and interiors were lined with woven tule or cattail mats. Basketry used a twining technique: tightly woven conifer roots served as cooking and water vessels, while open-weave baskets held clams and conical traps caught fish. Woven weirs were also set in bays, estuaries, and rivers. In the late 18th century, British, Russian, and American traders arrived in growing numbers, bringing iron and textiles but also devastating disease. Smallpox first reached the Oregon coast in 1775, probably carried by Spanish sailors; another outbreak followed in 1801. Measles, whooping cough, influenza, syphilis, and dysentery compounded the toll, and in 1830 a sickness now believed to be malaria killed thousands. Descendants of both peoples are today represented by federally recognized tribes, including the Confederated Tribes of Coos, Lower Umpqua, and Siuslaw, and the Confederated Tribes of Siletz Indians.

In 1972 President Richard M. Nixon established the Oregon Dunes National Recreation Area, placing 31,566 acres (12,774 ha) under US Forest Service management. It is now among the agency’s most popular sites for off-highway vehicle use. Until the first management plan was adopted in 1979, 91% of the area was open to off-road vehicles; a revised plan in 1994 cut that to 31%, though enforcement of designated trails has grown increasingly difficult. A more fundamental challenge is the loss of open sand to invasive vegetation. European beach grass, introduced in the late 19th century to stabilize drifting sands near houses, river mouths, and roads, spread rapidly in the absence of natural controls and now threatens the nesting habitat of the western snowy plover. Scotch Broom, a deciduous shrub native to western and central Europe, was widely planted for dune stabilization and as a highway ornamental; it has since become the most extensive forest weed species in the region. Read more here and here. Explore more of Umpqua Beach and Oregon Dunes National Recreation Area here: