The Hewlett's gauge, I'm pretty sure, is still being calibrated itself unfortunately and it's the cfs that it is reporting that are way off at low flows. Except I also believe the Canyon Mouth minus the NF, PLUS the diversion above the NF (sometimes, def the past couple days) isn't working reat now either because the canyon mouth gauge also may need some recalibrating, as it's reading a bit too high.
I'm pretty accurate with estimating actual cfs (especially in the Poudre, my 16th summer paddling it is approaching) and from what I know, 200 ACTUAL cfs is about 1.2 at Pinview (my minimum for narrows generally). If the Canyon Mouth was accurate then the current estimation of 283 cfs (Canyon Mouth 417 - NF below Seaman 184 + Horsetooth diversion ~50 = 283) would mean about 1.8 at Pineview. It's only at .9, and I also looked closely at Picnic Rock recently when Canyon Mouth was reading ~400 and there was no way there was actually 400 cfs there. It looked more like 250. Which would make sense because if you do the equation with those #'s at the time (which were about CM 250 - NF 140 + HD 50 = 160 cfs) then the Pinview foot gauge and the cfs would match up approx with my historical record which would make it 160 cfs = ~.9, which is what it was that day. This also correlates pretty close to Marty's conversion chart on the Poudre Rock Report page I believe.
To sum, it is very confusing and there is no way that there is 322, or even 283 cfs actually at Hewlett's, and therefore getting a good correlation with Pineview feet going has yet to happen, and so still the most reliable thing to do is get the rock report and/or drive up the canyon yourself.
Evan Stafford American Whitewater - Southern Rockies Representative