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Williams Fork (Parshall)

Tailwater · Williams Fork Res. to Colorado RiverClass 2Fair / Picky
88

● Live flow from USGS · water temp from sample (no temp sensor at this gauge)

52 cfs
Flow
42°F
Water temp
40.036, -106.205
Location · USGS gauge
30–120
Ideal flow · cfs
Conditions · water Low 40s°F

~23 cfs (Cutthroat Anglers 6/15: flows low at Willie's Tailwater) — dropped back from ~66 cfs; low/clear and technical, fish moving around as flows change · cold deep-reservoir release keeps it heat-proof

Strategy

Cutthroat Anglers 6/15: 'Williams Fork running ~23 cfs — flows low at Willie's Tailwater. Focus on baetis, midge and small caddis imitations for your bottom fly when nymphing; expect fish moving around if flows keep changing.' Low/clear means technical small-fly presentations. Hike ~1 mi from CR-3 lot. C&R artificial only. Light nymph rig: RS2 gray #18-22, small midge larva, BH Pheasant Tail #16-20, small perdigons, Poison Tung #18-20. Today (Wed) ~73°F mountain pocket, mild and breezy with an isolated late-day storm — the cold deep-release tailwater fishes well all day; work the warmest hours and shaded runs.

Detailed report

Flows DROPPED back to ~23 cfs (CTA 6/15: 'low at Willie's Tailwater'). Status moved from Fishing Well to Fair / Picky — low/clear and technical, fish moving around as flows change. Baetis, midge, small caddis the play; streamers/indicator rigs in the warmest hours. RS2, small midge larva, PTs, perdigons; 5-6X. Cold deep-reservoir release keeps water temps consistent and heat-proof. Driving access fully restored. Mountain pattern: today (Wed) ~76°F mountain pocket, sunny and dry (Silverthorne area is the driest of the group); mostly sunny ~73–76°F through Thu with only slight storm chances.

Report: Cutthroat Anglers · June 15, 2026 (CTA latest) · Cutthroat Anglers staff

Fly-shop reports

2 shops report on Williams Fork (Parshall)

Reports are pulled live from each shop when you open this river. Shop wording varies — tap through for the full, original report.

Fishability Score breakdown

How today's 88 is built. Flow 35% · Water temp 25% · Weather 20% · Hatch 20%.

Flow100/100
Water temp86/100
Weather76/100
Hatch match82/100

Weather & hatch are placeholder factors until wired to live sources.

What to throw — by time of day

Morning
Dawn – 11am

Pat's Rubber Legs (anchor) + Poison Tung #18, RS-2 #18–22, small Pheasant Tails, eggs #14

MiddayNOW
11am – 5pm

JuJu Baetis #18, Sparkle Wing RS-2 #20, San Juan Worm #14, small Sculpin/Bugger swung

Evening
5pm – dark

Midge cluster #20, Adams #20, streamer swung in low light

Species
Brown (dominant) · Rainbow
USGS gauge 09038500

Seasonal hatch report

In season now

Fall — BWOs & Streamers

Cooling water wakes the fish up. Blue-Winged Olives return on grey afternoons, and pre-spawn browns chase streamers hard.

Morning
Dawn – 11am
Hatching
Midges · BWO nymphs · Trico (early fall)
Flies
Pheasant Tail #18, RS-2 #20, Trico spinner #24
Rig
Nymph deep; streamer the banks early for aggressive browns.
Afternoon
NOW
11am – 5pm
Hatching
Blue-Winged Olives · October caddis (freestone)
Flies
BWO dun #20-22, Parachute Adams #20, October Caddis #10
Rig
Overcast = dry BWOs; otherwise swing/strip streamers for browns.
Evening
5pm – dark
Hatching
BWO spinners · Streamer window
Flies
Sculpin/Woolly Bugger #6-8, RS-2 #20
Rig
Strip big flies through frog water at last light for the biggest fish.
Source: Hatchwise Seasonal Guide · updated Jul 5, 12:00 PM MT. General seasonal patterns — verify against a current local shop report before you go.

Sources & last updated

SourceFeedsMost recent update
USGS 09038500 Williams Fork (Parshall)Sep 14, 11:45 AM MT · flow live
Hatchwise Seasonal GuideHatch & fly guidanceJul 5, 12:00 PM MT · editorial
Cutthroat Anglers Shop fly reportLive — see report
Trouts Fly Fishing Shop fly reportLive — see report

Live flow & water temp come straight from the USGS Instantaneous Values service; timestamps are the gauge's own reading times (Mountain Time).