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Alamosa River Fishing Information
Middle Section - near Alamosa, CO
The Alamosa River should serve as a reminder to the hazards of bad mining practices and the need for better standards. The Alamosa River make in the 80’s was subject to mining tailings and poisons into the river which to this day has made the river nearly devoid of trout. It isn’t until miles below where the mines are that the water adjusts back to what appears to be a fishable water color. The river just hasn’t been able to recover. The worst part is that it happened at the headwaters leaving no water above and hurting all the water below for miles.
All of this aside, there can still be some trout found just a bit above terrace reservoir, and though we haven’t fished it ourselves, have heard there are fish below the res, where the lake and waterfall below do a lot to help bring the river back to a livable place for trout. We wanted to put the Alamosa River on here because we fished a couple sections and did catch a couple small trout, which warrants it for the river explorer and if you find yourself up here wanting to fish, then you can use this tool to help you find some spots worth fishing for a few nearby. Beyond that, we wouldn’t recommend coming to the Alamosa for any full fishing experience, especially when you pass the Rio Grande, an excellent trout fishery and are not far from the Conejos over the hill to get to some great trout fishing as well.
We found a few small fish on dry flies working likely pocket water near the campground and found it to be a beautiful river to experience as the iron rich water gives it a unique color. We are glad we explored the area and recommend looking into further upstream above the headwaters as well as north and south of this area for excellent fishing opportunities.
Fish: Few Small-Sized Fish
Best Techniques: Dries & Nymphs
Best Seasons: Spring - Fall
River Type: Medium Freestone
Fish Types: Rainbow Trout, Brown Trout
Dog Friendly: Yes
Located in the Rio Grande River Basin near Alamosa, CO
Fishable Seasons & Current Weather
The best seasons to fish this river are Spring - Fall. See the current weather reports for the next 5-6 days listed below for the nearest city.
wind: 2mph SE
H 49 • L 47
Weather from OpenWeatherMap
Knowing what flies to use is only have the battle. You have to know when the insects are active on the water and when it's likely the trout are feeding on them. Refer to our hatch charts below to understand when the insect categories and some of the possible hatches on the river.
Midges hatch year round, but their importance is from September through winter into April. During the warmer months, the trout often focus on larger insects as they are more active on the water like mayflies, caddis and stoneflies.
Aside from Blue wing olives, mayflies are active most commonly from May to August in Colorado. There are many different mayfly hatches found on most rivers and the most common are listed below.
Blue Wing Olive: September throut winter to April
Caddis hatch starting early in May and continue to the end of October.
Colors: Olive, Green, Yellow, Tan, Orange, Brown and Black.
Sizes: #10 - #20
We have some great stonefly hatches in Colorado and while not all rivers carry all species of salmonflies, you can often fish stonefly adult patterns with confidence from May to September. Start off in bigger sizes and get smaller till September hits (size 8 - 16)
Terrestrials don't hatch since they are out of the water, but they can have importance starting in Mid April and ending in September.
These are the the top flies we sell for this river. Use the hatch chart above to know what flies you will want to have in your fly box during your adventure on the river and then select the flies here 30 days before your trip to get them at a great price. All of our flies are hand tied to each order to ensure quality and to keep our prices low for you.
Click on a fly below to select a size and color for purchase.
If you need an easier solution than selecting each fly and size, try out our top fly assortments for this river that will put all the flies you need in a single order for this river. We've already selected the flies we use in our fly box for this river including the sizes and colors and put them in these assortments so you can fish with the confidence that you have the right flies in your box.
Click on any of the pictures to see what flies, colors and sizes we recommend in each assortment.
Use these epic resources to get ready for your adventure. Whether you're planning your trip, learning your insects, improving your fishing with expert tips or getting detailed resources from the USGS streamflows or DoW, we got you covered to help you find the river and find the success you want.