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. However:

Warning!
In the light of the recent fatality on the Tellico and a subsequent near-miss, members of the victim's party have requested that strong warnings be placed on the Tellico page (section 2) as follows:
The top drops in the Ledges section (Top Ledge, Middle Ledge, and Baby Falls) become extremely retentive at levels over 1000 cfs (3.5 ft--editor's note). They should be warned that a paddler was killed on January 1, 2011 at the first ledge. Water levels were very high. Also, in my opinion, the Ledges should be considered Class IV+ at these levels.
Thanks!
Charlie Walbridge
Link to accident report from January 1, 2011

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).