One way I can recommend to 'guage' the conditions and water levels from the water office site is to look at the history of the past year or so. You can get assess the pattern and set a benchmark for the average water flow. You can also note the dates with the peaks, which resemble precipitation and runoff. Go to the environment Canada weather history database, which will tell you how much (mm) it rained on that day. Although it's not perfect, you can figure out how much the forecasted rain will affect the trib. It's a little bit of work, but if you are tight on vacation days or wife/gf get out of jail free days, then you can choose an ideal day to get out.