Sad Observation.....I think

The past few days I have been fishing the Kayaderosserars Creek (Kaydeross) pretty heavily.  I have had absolutely no luck, but I have been fishing an area that has not yet been stocked. I am fine with this b/c in the past I have pulled holdover fish out of there early in the season.  However, I have noticed the fishing here progressively deteriorating over the last couple years and I have often wondered why.  Yesterday, I went to a spot that is my "goto" spot; the one where I can always land something.  While scanning the water I notice  hatch starting to come off.  It became a full blown hatch, with thousands of bugs coming off.  Sweet right?  Not exactly.  I sat and watched in amazement for a 1/2 hour, as there was not 1 rise on the water.  No tail swirls, no nothing.  I have never encountered such a thing.  I am saddened now by the notion that this river could be completely put and take. 
 
My questions are-   Could I be wrong?  Could such a scenario take place if there were trout present?  Has anyone notice the same thing about the 'ross?  I am truly interested in anyone's input.
 
-Matt

Well that's good to hear.  Maybe I am wrong.  Maybe the water is still a little cold and I am getting worse as an angler and not better! (lol)
 
I keep on scouting and maybe I'll come up with something.