Gauge Description:

Low 250 cfs
Good 500-800 cfs
High 1000+ cfs

At higher flows, the last 1/2 mile of the Upper Tellico becomes significantly more difficult than the upper portion.

Conversion from feet to cfs, from Julie Keller:

1.9   305 cfs   3.5   998 cfs   
2.0   330 cfs   4.0  1250 cfs  
2.2   403 cfs   4.5  1515 cfs 
2.5   526 cfs   5.0  1800 cfs  
2.7   618 cfs   6.0  2400 cfs  
3.0   770 cfs   7.0  3150 cfs

The minimum suggested level, 1.8 ft, is about 280 cfs. The Upper Tellico can be run much lower (down to 150 cfs) but it is not the same river. No push, lots of scraping, lots of rocks. 300 cfs is an enjoyable low level.  (Please read comments about the change in opinion on the minimum levels this river is runnable).