Every steelheader in Washington state who owns and operates a computer should have this site or one like it bookmarked:
http://waterdata.usgs.gov/wa/nwis/current/?type=flowThe hydrograph is something many guys (undoubtedly many on this board) have been using for several years now, but a lot of steelhead anglers have still not caught on. Even among those who do use it, it is often viewed as more of a tool in the winter for "blown" or "not blown" judgments. Hydrographs can be much more useful than that, though.
In fact, I've found hydrographs to be perhaps even more useful in the summer than in the winter. Early in the season, they will telegraph changes in snowmelt which you may not be able to equate with changing temperatures at the surface, and later in the season they will pick up showers (freshets) that you may not have otherwise ever been aware of (maybe you stayed completely dry at your house).
After you have regularly refered to the hydrograph for a couple of seasons, you will begin to know exactly what to expect when you head to the river. On some of the streams I fish in the summertime, a mere 50 cfs fluctuation can reshape my plans for the entire day. When covering water is your business, you will hook many more fish if in planning your approach to the stream you are familiar with which runs will fish too slow or fast, hold adequate depth or not, give adequate surface cover or not, etc.
Get to know your favorite water in hydrograph terms and you will hook more fish year-round, guaranteed (provided you know how to hook fish in the first place). And with the "official" summer season only 2 weeks away, there is no time like the present to start learning.

Andrew
(Sorry for the boring post if you already knew this stuff, and I didn't think there was enough content for the "Tips and Tutorials" forum (no pics, even)).
