Easy - my understanding is that 'tide change' is affected by the pull of the moon, in other words gravity fields. The larger the body of water the more noticible the effect. the Great Lakes have tide tables of thier own. Lake Washington, by no means on a par with the Great Lakes is still a larger body of water than say Rattlesnake Lake near North Bend. It will have a more noticible change due to the 'pull' of the moon. Probably not noticable enough though to have a 'high tide and low tide'. Rivers that dump into larger bodies of water, i.e. the Sound and the Ocean, will have high and low tides because of the direct connection to the large body of water. The Cedar which dumps into Lake W. will not have the 'high' and 'low' tide changes because the Lake does not really change that much. Hope that helps.