I am a strong proponent of keeping a fishing  journal. There are several out there and find one that suits your style (free flowing writing or entries prompts that seek specifics and a little space to write. Many of us gather intell on the front end via friends, shops, on line etc. but afterwards we don’t write it down. Starting a journal requires self discipline to maintain, especially if your outings don’t yield results. 

SwittersB's & Tony's Fly Fishing Journals

The journals provide plenty of intell for future outings and you will soon write to not only provide data for future trips but to capture special moments and emotions. Going back and reading the entries 20 years or more later about yourself or your fishing partners is quite satisfying. Here are some entries that while not overly unique, show the excitement and pleasure I felt and still provided prompts for future outings.

I remember this day, a water boatman return to the lake with pronounced plops hitting the lake and me. Fascinating.
The journal can even be the repository for old cards and pictures. Here I found a card from my mom, who obviously knew how to select a Christmas card I would enjoy.
Tony's entry showed his transition to a 2 hander and expensive tastes.

Consider a journal that fits your writing style, temperment and invest the time (takes maybe 10 minutes or so) to make the entries and reap the rewards in the near future and many years later. Oh, that Little Gray Nymph….I will throw it at you again.