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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 ...
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.
Winchester Bay, formerly Umpqua City, is an unincorporated community in Douglas County, Oregon, United States. For statistical purposes, the United States Census Bureau has defined Winchester Bay as a census-designated place (CDP). The census definition of the area may not precisely correspond to local understanding of the area with the same name.
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.
Inside the top of the lighthouse U.S. Coast Guard 36 Foot Motor Lifeboat at Umpqua Lighthouse Museum. Located at the mouth of Winchester Bay, Oregon, the first Umpqua River Light was built in 1855 and lit in 1857. Built along the river channel, the original light was vulnerable to seasonal flooding.
The Upper Umpqua people lived mostly on the South Umpqua River, near present Roseburg, Oregon and the Umpqua River upstream of the head of tide (present-day Scottsburg, Oregon). Their self-designation was Etnemitane , Tl'uu-dv-nee-yu (literally "prairie people") or simply Dv-nee-yu / Dv-ne ("people"). [ 8 ]