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North St. Vrain Creek

Freestone · Wild Basin (RMNP) → Allenspark down toward LyonsClass 2Fair / Picky
86

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

72 cfs
Flow
41°F
Water temp
40.116, -104.818
Location · USGS gauge
20–100
Ideal flow · cfs
Conditions · water 37–45°F upper · 44–48°F lower

whole drainage now open — melt essentially done (~2–3 weeks ahead) · RMA 6/20: St. Vrain system flows a bit on the higher side with unusually warm-ish water temps for late June · Wild Basin trails drying (6/21–6/23 reports: scattered mud, occasional high drifts) · fish AM for cooler water

Strategy

Whole drainage now open — melt essentially done. RMA 6/20 notes the St. Vrain system running a bit high with unusually warm-ish water temps for the date, so fish mornings and watch the thermometer on the lower stretch. Wild Basin trails drying out (late-June reports: scattered mud spots, occasional drifts up high). Tight, brushy stream — short rod (7.5–8 ft), beadhead dropper to reach pool fish, dry-dropper for eager brookies up high. Park pass required for Wild Basin (RMNP timed-entry IN EFFECT — verify if your TH is inside zone). Trail Ridge Road open.

Detailed report

STATUS CHANGED to Fair / Picky (from Pre-runoff window): melt is done and the whole drainage is open — Wild Basin included (trail reports 6/21–6/23: scattered mud, occasional high drifts only). RMA 6/20: system flows a bit high with warm-ish water temps for the date — morning sessions favored. Designated wild trout water in places. Wild Basin trailhead — ~30 min walk to good water. Mountain pattern: today (Sun Jul 5) ~77°F, mostly sunny — all-day window; scattered storms return Tue–Wed.

Report: Front Range Anglers / Trouts / Saint Vrain Anglers TU · June 4, 2026 (general) · FRA staff + St. Vrain Anglers TU

Fly-shop reports

5 shops report on North St. Vrain Creek

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 86 is built. Flow 35% · Water temp 25% · Weather 20% · Hatch 20%.

Flow100/100
Water temp79/100
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

Lower stretch: small midge #20, Pheasant Tail #18 — upper Wild Basin: not yet

MiddayNOW
11am – 5pm

Lower (around Lyons): BWO #20, dry-dropper Adams + dropper. Wild Basin: typically May–Sept only.

Evening
5pm – dark

Lower: Elk Hair Caddis #16, Adams #18

Species
Brook (eager) · Brown · Cutthroat (occasional)
USGS gauge 06721000

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 06721000 North St. Vrain CreekSep 14, 11:00 AM MT · flow live
Hatchwise Seasonal GuideHatch & fly guidanceJul 5, 12:00 PM MT · editorial
Front Range Anglers Shop fly reportLive — see report
FishExplorer Shop fly reportLive — see report
NPS — Rocky Mountain National Park Shop fly reportLive — see report
Saint Vrain Anglers TU Shop fly reportLive — see report
The Catch and The Hatch 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).