Irishrover
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This time of year there will be quite a few sports boats running out to the ocean via the Columbia River Bar. Nowhere on the coast is it more important to understand a bar than it is on the Columbia. That's because the bar is several miles long and several miles wide. There is an unbelievable amount of water being pushed out into the sea at that location. One of the things that some folks misunderstand on that bar is the timing of the so called slack tide. What it is not is the same time as low tide and high tide. Because of the large volume of water flowing it can be as much as two hours after low or high tide for slack to occur. Here is a very good web site that calculates the water volume and give the real slack time. It's what I use to determine the safest bar crossing times. Above all else remember crossing on the ebb especially max ebb is the most dangerous.
http://tbone.biol.sc.edu/tide/tides...,+NNE+of,+Washington+Current+(15d)&type=graph
http://tbone.biol.sc.edu/tide/tides...,+NNE+of,+Washington+Current+(15d)&type=graph