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The Oregon Parks and Recreation Department had two primary suggestions for watching the tides safely. 1: Watch from a distance. Look for locations well above the action and away from cliff edges.
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(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 ...
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 ...
Portland (/ ˈ p ɔːr t l ə n d / PORT-lənd) is the most populous city in the U.S. state of Oregon, located in the Pacific Northwest region. Situated in the northwestern area of the state at the confluence of the Willamette and Columbia rivers, it is the county seat of Multnomah County, Oregon's most populous county.
The average discharge at the lowermost gauge, near the Morrison Bridge in Portland, was 33,220 cubic feet per second (941 m 3 /s) between 1972 and 2013. Located at river mile (RM) 12.8 or river kilometer (RK) 20.6, the gauge measures the flow from an area of 11,200 square miles (29,000 km 2 ), roughly 97 percent of the Willamette basin. [ 14 ]
The average discharge at a gauge near the Morrison Bridge in Portland was 22,590 cubic feet per second (640 m 3 /s) between 1972 and 2009. Located at RM 12.8 (RK 20.6), the gauge measures the flow from an area of 11,200 square miles (29,000 km 2 ), roughly 97 percent of the Willamette basin.
Oregon Slough Railroad Bridge (BNSF Bridge 8.8) 1908: Swing bridge, Pratt truss: 1,524 feet (465 m) North Portland Harbor (an anabranch of the Columbia River) BNSF Railway: Burlington Northern Railroad Bridge 9.6 (BNSF Bridge 9.6) 1908: Swing bridge, Pratt truss