Wow, congrats on your day, sounds like your 1 weight got a work out. You must've had a blast on that light rod.
This time of year there can be a lot of different hatches of caddis and mayflies on the water. If the critters you saw were tannish, upright wings and long tails they were mayflies- caddis generally have "down wings" and don't have tails.
If you were fishing in the East, they might have been "Gray Foxes" (these are now considered to be the same genus and species as March Browns, but they are lighter and smaller tannish body and tend to emerge a few weeks later in the season) Gray Foxes
or Sulphers (often pale yellowish bodies) Mayfly Species Ephemerella dorothea (Sulphur) Hatch
These are 2 of the major mayfly hatches on a lot of streams in the East this time of year.
If it didn't have tails, and was a caddis, some that are about a size 16 that should be zooming around on streams in the east now are
Apple Caddis and Grannoms - Caddisfly Family Brachycentridae (Apple Caddis and Grannoms) Hatch
or one of many "Green Sedges" (the adults often have tannish wings) with free living larvae found in riffles (nymphing with a Green Weenie or Green Rockworm can be very productive beween hatches this time of year). Pictures of the adults are on page 2:
Caddisfly Genus Rhyacophila (Green Sedges) Hatch
Matching the approximate size- or a size smaller and shade (light, medium dark, rather than exact color) often does the trick if you don't have a specific imitation. But if you can start to zero in on some of the hatches on the streams you fish, perhaps with the help of a hatch chart for your area, or advice from a local fly shop about your streams hatches, and take advantage of the info on a site like troutnut with a ton of pics and info on behavior and tips for fishing different hatches you'll have some options when the fish get picky, can target different areas to fish prior to the hatch (most mays and caddis have a distinct preference for a specific habitat- riffles, slow water etc depending on the species) and you'll have a better sense of time of day to be out there to catch things when specific hatches bust loose (hopefully). You can never know enough to guarantee fish, but every little bit helps and the more you know about the whole circle of life thang that takes place on your local streams, the more amazed you'll be at the awesome complexity and finely tuned balance that momma nature has come up with. But, I tend to be a little nerdy, so don't let your 'research' interfere with your time on the stream