Overall River Rating:


Williams Fork River Fly Fishing Report

Last update- 12/01/2017- Flows are up to about 50.7cfs range. At this flow we like to recommend throwing some eggs, worms, midges, and baetis. Good nymph patterns #18-20 Copper John, #18-20 Hares Ears. For smaller patterns raging sizes #18-22 RS2, JUJU beatis, Foam Back Emergers, and Shotglass beatis. As the day warms up look for some dry action such as BWS, Beatis, Caddis and other small dries. Good patterns are Sparkle Duns, Film Critic, Red Quill, Elk Hair Caddis, and Stimulaters. Look for fish to be hanging out in deeper pools and shallow riffs.

River Information

The Williams Fork river is another tributary of the Colorado worth exploring. The river is divided by Williams Fork Reservoir. The upper section is a classic high mountain stream ideal for a small 1-3wt fly rod and a box of bushy dry flies. The tailwater section below the reservoir is where most people head when fishing the "Willy's Fork". This tailwater can be quite succeptable to annual flows and the fishing can be very tough during low water years. During normal to high water years however the fishing can be superb, offering anglers the chance to catch sizeable, hard fighting Rainbow and Brown trout. This tailwater section is farirly short, coming in at about 2 miles long, before it reaches the Colorado River in the town of Parshall. 

Recommended Flies

Summer: Mayflies, Caddis, Shrimp

Pheasant Tail

size 16-22

Tungsten JuJu Baetis

size 18-22


size 18-22 (blk, olv, gry)

Rainbow Warrior

size 18-22

Two Bit Hooker Nymph

size 18-20

Tungsten Poison

size 18-22

Mercury RS2

size 18-22

JuJuBee Midge

size 18-22

Barrs Emerger

size 16-22

Black Beauty

size 18-22


Seasonal Conditions

The Williams Fork can be fished 12 months a year, however Summer and Fall will certainly be the most productive seasons. Come summer, hatches abound and the dry fly fishing can be phenomenal. Mayflies, Caddis, Terrestrials, and small Stoneflies will all catch fish in both their dry and nymph varieties. 

River Access

The tailwater section of the Williams Fork can be accessed in two locations.- both of which require approximately a 20 minute hike so make sure to bring some hydration. The river can be accessed off Hwy 40 at the town of Parshall by crossing the Colorado River and walking to the confluence. The other option is to head down County Rd 3, just east of Parshall, like you're headed to Williams Fork Reservoir. There is a DOW parking area on the west side of the road, approximately 1/3 mile south of the Colorado RIver. From here, follow the foot path to the river which is about 1 mile away.