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The dates of spring tides and neap tides, approximately seven days apart, can be determined by the heights of the tides on the classic tide tables: a small range indicates neaps and large indicates springs. This cycle of tides is linked to the phases of the moon, with the highest tides (spring tides) occurring near full moon and new moon.
The Umpqua River (/ ˈ ʌ m p k w ə / UMP-kwə) on the Pacific coast of Oregon in the United States is approximately 111 miles (179 km) long. One of the principal rivers of the Oregon Coast and known for bass and shad, the river drains an expansive network of valleys in the mountains west of the Cascade Range and south of the Willamette Valley, from which it is separated by the Calapooya ...
U.S. civil and maritime uses of tidal data. A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights.
Tide clock Tide clock Alunatime at Trinity Buoy Wharf, London. A tide clock is a specially designed clock that keeps track of the Moon's apparent motion around the Earth.Along many coastlines, the Moon contributes the major part (67%) of the combined lunar and solar tides.
Its parent company, Umpqua Holdings, is publicly traded. [1] As of 2016, Umpqua Bank was the largest Oregon-based bank and had 350 branches in Oregon, Washington, California, Nevada and Idaho. [3] [4] In October 2021, Umpqua announced it was merging with Tacoma-based Columbia Bank. Columbia Bank branches would transition to the Umpqua name and ...
The Umpqua Basin is a watershed in the U.S. state of Oregon. It includes the drainages of the South Umpqua River , North Umpqua River , mainstem Umpqua River and the Smith River . The basin lies primarily within three ecoregions (Coast Range, Cascades and Klamath Mountains ) and contains a wide variety of vegetation.
It joins the Umpqua from the north across from Reedsport, about 6 miles (10 km) from the mouth of the Umpqua on the Pacific Ocean. [5] The river is named for Jedediah Smith, who in 1828 led a party of explorers from Utah overland to northern California and southern Oregon. From California, they traveled north to the Umpqua River, camping along ...
Spring tides occur at the second and fourth (last) quarters of the lunar phases. By contrast, during neap tides, when the Moon and Sun's gravitational force vectors act in quadrature (making a right angle to the Earth's orbit), the difference between high and low tides (neap range) is smallest. Neap tides occur at the first and third quarters ...