Gauge Description:

Gauge is located about fifteen miles downriver. Actual flow for this reach is perhaps 25-30% of gauge, assuming tribs feed proportionate to size.

Desirable flows for last mile are probably lower than for the upper portion of run. Copper Falls is runnable at 500 cfs but for Red Granite Falls more water (800 cfs?) is preferable.

 

Gauge/flow analysis (based on most recent 50 years of data)
Drainage area at gauge	597 sq.mi.
All time minimum flow	27 cfs
90% of time flow exceeds	120 cfs
10% of time flow exceeds	1,360 cfs
All time maximum flow	22,000 cfs
10/90 ratio ('flashy-ness') (under 3 is fairly steady, over 10 is quite 'flashy')	11.3
Average runnable days per year	97

Offseason ('Ice') correlations:
3.00' = 322cfs
3.50' = 537cfs
4.00' = 780cfs
4.55' = 1090cfs
5.30' = 1570cfs
6.60' = 2520cfs
7.00' = 2850cfs
7.19' = 3000cfs