The "tailwater" section of Blue River through Silverthorne fishes fairly consistently year round. Water temps normally stay within the lower forties (fahrenheit), which doesn’t produce a large variety of hatches. For the most part, small midge larva, and Mysis Shrimp (small white shrimp inhabiting Dillon Reservoir), are staples of the trouts diet. Things start to get more interesting if Dillon Reservoir reaches capacity and “spills” through the top release of the dam, instead of the bottom. This causes a larger variety of aquatic insects that live in the Blue River to become active, and therefore more available to trout.
The best technique is usually nymphing under a small, inconspicuous indicator. Adjust your weight and indicator depth depending on the depth of the piece of water you are working, and to the depth at which the fish are holding. Seeing rising fish is a possibility, as is seeing some action on streamers.
Nymphs To Try: size 18-22 Mysis Shrimp, Biot Golden Stone size 12-16, Pats Rubber Legs in black/brown or olive/brown size 10-12 , Two-Bit Hooker size 16-18 black or olive, Pure Midges in black or cream, size 18-22 UV Midge in black, Big Bear Baetis 18-22, RS2 grey size 20-22, Grey bling Midge size 20-22, Chatreuse Desert Storm size 20-22, Disco Midge red sixe 18-22, Juan's Flux Capacitor red size 20-22
Dries To Try: Chew Toy Stimulator olive size 12-16, Matthew's Sparkle Dun olive size 22, Parachute Adams size 16-24, Black Brook Sprout Midge size 20-22 , size 20-22 CDC Morgan's Midge
Streamers To Try: Baby Gongas (olive, black, and rainbow trout), Wooly Buggers (olive, black, white), Pine Squirrel Leeches (black, purple, red)
At 600 CFS the Blue River in the town of Silverthorne is considered a bit “high”. However we find that it fishes pretty well at these flows, you can count on fish being pushed to the banks in pockets of calmer water or, stacked in any softer water that is created by larger river structure. Mysis shrimp are an important food source when more water is released from the reservoir, because more shrimp are flushed out with the increased flow. Larger aquatic insects such as Cranefly Larva, and Golden Stoneflies, can also be stirred up by the higher flows. Other than that, the standard food sources of midges, and small mayfly nymphs are still available to trout.
The Blue River through Silverthorne is holding at about 400 CFS. This can be a prime flow to fish this piece of water. More water makes the trout less spooky, and provides them with ample food. Expect to find fish in shallow calm water along the banks, and in deeper pools and eddies that contain some soft water. Small mayfly nymphs, midges, and Mysis Shrimp are still the staple food sources. Sometimes at these higher flows a small to medium sized Golden Stonefly nymph, or Cranefly Larva can effective as well.
Rumor has it that the stocking truck was just sighted in town.....if you find large numbers of trout holding in the same piece of water these could be recently stocked rainbows which will be willing to eat eggs, worms, and beadhead nymphs untill they get caught enough times to "smarten up". Our report from 4/18, and patterns listed above will still be the recomended set up for targeting resident fish that have not been freshly stocked.
The Blue River in town is fishing consistently, and not much has changed in the typical aquatic food sources available to trout (Mysis Shrimp, Midge Larva, and small Mayfly nymphs are the typical staples). We have been seeing stronger hatches of midges (black/dark grey size 20/22), and a few Blue Wing Olive Mayflies emerging as well. The flow is currently holding near 100 CFS, but should start climbing as warmer spring weather eats away at our snowpack. When the flows do start to rise, expect Mysis Shrimp to be food source number 1 for the trout in town. Finally, we have not had any reports of recent stocking here in town, we will post an update when we do get the word.
Question: What's going on with the Gold Medal status of the Blue River?
Answer: The Blue River between Silverthorne and Green Mountain Reservoir has been delisted from Colorado's Gold Medal list. The Blue within the city limits of Silverthorne is still listed as Gold Medal water. There are still great fish to be caught from Silverthorne all the way to Green Mountain Reservoir (and below). If you check in with us regularly, you have seen hundreds of photos of fish that were caught in this stretch over the years, and many that were caught (and released) this year. It's true; you won't find the numbers of fish north of Silverthorne that you will see in Silverthorne. But you will find fewer anglers and less selective fish!