Blue River Silverthorne

Blue River - Silverthorne

Difficulty Intermediate/Advanced
Ideal Days To Fish 4/1 through 4/3

Weekly Report

Report DateMarch 30, 2023

While the swings have been marginal, flows on the Blue have been somewhat erratic over the last couple of weeks. That being said, it has done little to negatively impact productivity and water clarity remains high. Trout continue to stack up in the deep and slow water most of the day and are feeding most heavily between 10 am and 3 pm. The next couple of days (3/30 to 3/31), will be windy and cold so unless you are willing to brave the elements we’d recommend waiting until Saturday or Sunday to fish. Regardless, nymphing with smaller midge larva and pupa imitations will do most of the heavy lifting. However, you shouldn't shy away from getting creative and going with something tiny and shiny like a Rainbow Warrior or Perdimidge. Otherwise, eggs, worms, mysis shrimp and leeches have been effective lead patterns. Dry fly fishing has been picking up as of late as the spring midge hatch intensifies so if you see trout actively feeding on the surface don’t hesitate to rig up a single, double or dry to an emerger. A Parachute Adams to a Griffith’s Gnat will be a good starting point, but don’t be afraid to mix it up. Single dry flies are often a good choice given how skittish and selective these trout are.

Recommended Flies

River Flow

Flow Region

Detailed River Info


Below Dillon Dam is a prized section of the Blue River that runs 19 miles until it meets the Green Mountain Reservoir. The stretch of river that runs through the town of Silverthorne is one of the most sought after tail waters in Colorado. Dillon Reservoir is one of the few Colorado reservoirs that was stocked with Mysis Shrimp and as a result, when water is released from the dam, shrimp trickle into the river. This calorie-rich meal is the trout equivalent to a body builders training supplement and results in some beefy fish! This section of the Blue is unique in that it runs through the tourist heavy town of Silverthorne. Therefore, if you are looking for a fishing experience full of spectators touting Tommy Hilfiger bags with a shot at landing a trophy trout, the section through Silverthorne is for you. If you are seeking more solitude and less materialism, head north down Highway 9 and pull off at one of the designated parking areas for fishing access.


The Silverthorne stretch of the Blue is a pocket water paradise. Anglers can leave their “A River Run’s Through It” casts at home and instead focus on short and tactical casts. Anglers can expect to find Rainbow, Brown and Brooke trout along this stretch with the highest concentration of trophy Rainbows being located below the dam. With the exception of Mysis Shrimp, the fly selection for the Blue is relatively consistent with the other popular Colorado tail waters. Size 18 – 24 Midge and Baetis nymphs produce year round. In the warmer months, this stretch of the Blue experiences quality Green Drake and BWO hatches. The Blue River is an accessible year round fishery and can easily be coupled with a half ski, half fish day or a family trip to the outlet malls where you drop the family and you seek much needed alone time on the water. 

River Access

The tail water section of the Blue River below Dillon Reservoir has several miles of public water access between the town of Silverthorne and Green Mountain Reservoir. The most popular section runs behind the Silverthorne Outlets and can be accessed very easily. If you're looking for more solitude, wander north on Highway 9 towards Green Mountain Reservoir. While there is sporadic stretches of private water, the public water sections can be easily identified by parking and Department of Wildlife signage.