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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.
Mean high water (MHW) is the average of all the daily tidal high water levels observed over a period of several years. It is not the same as the normal tidal limit.In the United States this period spans 19 years and is referred to as the National Tidal Datum Epoch.
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 ...
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 ...
A bore in Morecambe Bay, in the United Kingdom Video of the Arnside Bore, in the United Kingdom The tidal bore in Upper Cook Inlet, in Alaska. A tidal bore, [1] often simply given as bore in context, is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travels up a river or narrow bay, reversing the direction of the river or bay's current.
(This is caused by the time interval associated with the solar tides.) Hundreds of factors are involved in the lunitidal interval, especially near the shoreline. However, for those far away enough from the coast, the dominating consideration is the speed of gravity waves, which increases with the water's depth. It is proportional to the square ...
The Umpqua chub [1] or Umpqua Oregon chub [2] (Oregonichthys kalawatseti) is a species of freshwater fish in the family Cyprinidae. It is found only in the Umpqua River and partially in its tributaries ( North Umpqua , South Umpqua , Smith River , Calapooya , Cow Creek , and Ollala Creek), Oregon [ 2 ] in the United States, making it an endemic ...
Fort Umpqua was a trading post built by the Hudson's Bay Company in the company's Columbia District (or Oregon Country), in what is now the U.S. state of Oregon. It was first established in 1832 and moved and rebuilt in 1836. [1] Fort Umpqua was first established in 1832 at the confluence of Calapooya Creek and the Umpqua River.