Weber Help for a Rookie

[OAK_CREEK_KID]

My son and I fished the Weber just south of Coalville on Thursday for the first time. We usually go to the MP cause we just started fly fishing a couple of months ago. It was a great time to be on the river. We each hooked about 5 or 6 fish but never netted them. Seen a few BWO's flying around. Didn't notice any midges but seen lots of scuds in a nearby irrigation ditch but none that I could see in the river. I lifted up a submerged rock and underneath were a few small black flat looking things like maybe slugs or leeches. Could this be?[fishin]
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