Colorado Front Range — Fly Fishing Conditions

Poudre Canyon · Big Thompson · Cheesman/Deckers · Joe Wright · USGS + Open-Meteo + SNOTEL + CDSS

Last updated: —

Fishability Summary Combined Signal

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Calculating…

Fetching live data…

Air Conditions —

Air Temperature

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Humidity / Wind

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Water Temp — CO Trout Activity

< 40°FMidging only · slow bite · deep nymph

40–50°FWarming · BWO hatches · active browns

50–60°FPrime · caddis/stone/PMD · peak activity

60–65°FWarm · fish early/late · terrestrial window

65–68°FStress zone · consider moving on

> 68°FDo not fish — C&R fatal in heat

Barometric Pressure trend drives the bite

Current Pressure

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(local ground level station pressure)

3-Hour Trend

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Pressure — past 72 hrs

Snowpack —

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% OF MEDIAN

Loading NRCS SNOTEL…

Pulling current snow water equivalent and 30-year median.

NRCS SNOTEL · live station page →

CDSS Water Call Status Colorado Division of Water Resources

Checking active administrative calls…

Why this matters: Colorado operates under Prior Appropriation water law. A senior water rights holder can "call" the river, forcing junior diverters to cut flows. These changes are administrative — not weather-driven — and can shift flows in hours.

View all active calls on CDSS →

Stream Spotlight —

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Flow

—cfs

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Gage Height

—ft

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Water Temp

—°F

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All Front Range Gauges click a row to focus

Stream	Flow	Ht	Status
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5-Day Forecast —

Forward-looking fishability derived from weather forecast (air temp, wind, precipitation, pressure trend) plus the current runoff-season state and snowpack. Rainfall impact on flow differs by stream type (freestones respond in hours, tailwaters steady). During peak runoff (mid-May–late Jun with >100% snowpack), freestones are auto-flagged HIGH RUNOFF RISK regardless of the current gauge. Confidence degrades with distance — Day 1–2 good, Day 3 moderate, Day 4–5 indicative only.

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Hatch Calendar Front Range bugs by month · current month highlighted

Colorado note: Pressure from Denver metro anglers is heaviest on weekends April–May and July–September. Midges are year-round — size 18–24, most important winter hatch on all tailwaters. BWOs shine in overcast cool conditions (Mar–May, Sep–Oct). Golden Stoneflies are a big event on the Poudre & Big Thompson (May–Jul). Caddis dominate evenings May–Oct. PMDs (Jun–Aug) are the signature Cheesman Canyon & Big Thompson daytime hatch. Terrestrials — hoppers, ants, beetles — are critical summer dry fly fishing Jul–Sep.

30-Day Trends — Flow & Gauge Height past 30 days, all Front Range gauges

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Condition Guidance Front Range–specific logic

Fishability Summary (0–100)

PRIME 75–100 Get on the water now

GOOD 60–74 Worth the drive

FAIR 45–59 Fishable — manage expectations

MARGINAL 30–44 Tough bite likely

TOUGH < 30 Off-color or blown out

Runoff Season — CO Fishing Calendar

Winter (Dec–Feb) Tailwaters only · midge/BWO on Cheesman

Pre-Runoff (Mar–mid May) Prime · low clear flows, browns aggressive

Peak Runoff (mid May–Jun) Avoid freestones · 2,000–5,000 CFS, blown out

Post-Runoff (Jul–Aug) Prime · clearing flows, hopper time

Fall (Sep–Nov) Prime · browns pre-spawn, fewer crowds

Per-Stream Flow Thresholds calibrated — these rivers vary enormously

Poudre Canyon: 100–500 CFS prime · < 80 low/clear/tech · > 800 blown

Big Thompson below Estes: 20–80 CFS prime · > 150 difficult wading

Cheesman / Deckers: 100–400 CFS ideal · < 100 ultra-tech · > 500 difficult

Joe Wright / N. Fork: 5–40 CFS prime · small tributary water

Pressure Trend (3-hr Δ, inHg)

RAPID FALL ≤ −0.10 · active feeding window

FALLING −0.10 to −0.03 · pre-front bite increasing

STABLE −0.03 to +0.03 · baseline activity

RISING +0.03 to +0.10 · steady feeding

RAPID RISE ≥ +0.10 · post-front slowdown

Stream Character CO rivers respond differently to runoff & rain

Freestone Poudre Canyon, Joe Wright — fully snowmelt-driven, blow out in peak runoff

Tailwater Cheesman/Deckers, Big Thompson below Estes — dam-regulated, steady, fishable year-round

Tributary Joe Wright Creek, N. Fork Poudre — small headwater water, less pressured

CDSS Water Call — Colorado's Edge

Colorado runs on Prior Appropriation water law. When a senior rights holder "calls" the river, junior diverters must cut flows — shifting CFS within hours for reasons that have nothing to do with weather. The live indicator above pulls from CDSS (Colorado Division of Water Resources). An active call on your target river means today's flow may not match yesterday's.

Reports & Reference Links

Kirk's Fly Shop — Estes Park Authoritative Big Thompson & RMNP reports
St. Peter's Fly Shop — Fort Collins Cache la Poudre conditions, updated frequently
South Platte Fly Shop — Deckers Cheesman Canyon & Deckers reports
Colorado Parks & Wildlife — Fishing Regulations, licenses, Gold Medal water list, stocking reports
CDSS — Active Administrative Calls Live water rights calls — the source of our CDSS indicator above
NRCS SNOTEL — Colorado Snowpack Map Real-time snow water equivalent across all CO stations
USGS Colorado — Real-Time Water Data Every active stream gauge in Colorado
Rocky Mountain National Park — Fishing NPS regulations for Moraine Park / Fall River / greenback waters

About the data: Stream flow, gauge height, and (where reported) water temperature come live from the USGS Water Services API at 15-minute cadence. Air temperature, wind, humidity, and barometric pressure come from Open-Meteo, centered on whichever stream is selected above. Snowpack data comes live from NRCS SNOTEL AWDB (current SWE vs. 30-year median). Water rights call status comes live from CDSS (Colorado Division of Water Resources).

Why this dashboard is different from the Minnesota dashboards: Colorado Front Range rivers are heavily snowmelt-driven. Peak runoff (typically late May – early July) can push freestones to 2,000–5,000 CFS — completely unfishable. The fishability score includes a runoff-season modifier: during mid-May through late June with above-normal snowpack, freestones (Poudre, Joe Wright) are auto-flagged HIGH RUNOFF RISK regardless of the current gauge reading, because flows can go from 300 to 2,000 CFS in 24 hours. Tailwaters (Cheesman/Deckers, Big Thompson below Lake Estes) are dam-regulated and stay fishable year-round, making them the Colorado go-to during peak melt.

Regulations: A Colorado fishing license is required. Key catch-and-release zones: Cheesman Canyon (C&R only), Big Thompson ~9 mi below Lake Estes to Waltonia Bridge (C&R, flies/lures only), and multiple designated Wild Trout and Gold Medal sections on the Poudre. The Cache la Poudre is the only river in Colorado designated as a Wild & Scenic River by the NPS. RMNP waters require a park entrance fee in addition to your CO license — see CPW regulations before fishing.

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