Also because the website it hard to figure out here is the screen where you can type in multiple stations or just one and get overlaid graphs to show the difference. Changing from say 7 day to 1 will show a more spread out timeframe.
Again if you check this against the realtide app it's pretty dang accurate.
http://waterdata.usgs.gov/la/nwis/uv...ate=2015-03-03