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Jsawatzky has attached these 3 pictures to aid in identification. The message is below.
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JsawatzkyJune 26th, 2015, 9:18 pm
Posts: 1My husband brought back a bottle of gravel from a river in middle Quartz creek in pitkin Colorado, he had added tap water to the gravel while in pitkin. Well I just noticed these 2 little bug/fish like creatures swimming around in the bottle today( it's been a month since we brought the bottle back and it has been sealed) it is hard to get a good clear picture but we really like to get some sort of idea as to what they are
MillcreekJune 26th, 2015, 9:57 pm
Healdsburg, CA

Posts: 356		As near as I can tell they are mayfly nymphs. They would appear to be either Siphlonurus or Callibaetis species.

http://www.troutnut.com/topic/8794/Siphlonurus-sp

http://www.troutnut.com/topic/8823/Callibaetis-sp

Hope this helps,

Mark
EntomanJuly 3rd, 2015, 2:14 am
Northern CA & ID

Posts: 2604		Welcome to the forum!

I would go with the former based on the proportions. The length and size of the abdomens together with the crowding of the pronounced gills on the upper segs point to Siphlonurus (Gray Drake). The shorter tails/antennae/legs and wide heads do as well. They look to be fairly immature with some weeks to go before hatching.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
PaulRobertsJuly 3rd, 2015, 10:00 am
Colorado

Posts: 1776		Yes, young Siphlonurus. I found my first in a ditch in a hay field a good 2 miles from the nearest stream.
EntomanJuly 4th, 2015, 1:17 am
Northern CA & ID

Posts: 2604		Yeah, isn't that amazing? Fishing the upper Williamson in OR a few years ago I was crossing a flooded grassland at least 1/2 mile from the river. My waders were covered with nymphs... Not one however was recovered from my bug nets planted at the stream margins!
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
CrenoJuly 5th, 2015, 6:16 pm
Grants Pass, OR

Posts: 305		and they (along with corixids) carry on just fine in open sewage ponds. tough buggers :-)

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