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Colorado River — Pumphouse

Freestone · Upper C, Pumphouse to State Bridge · near KremmlingClass 1Fishing Well
64

● Live flow & water temp from USGS

459 cfs
Flow
63°F
Water temp
40.037, -106.439
Location · USGS gauge
800–3000
Ideal flow · cfs
Conditions · water 56–62°F

Early July — big float water dropping into shape (~1,000 cfs). Prime stonefly, caddis and PMD water, with hopper season just starting. The classic Pumphouse-to-Radium / State Bridge float.

Strategy

The Upper C is big, forgiving float water that rewards covering water. Run a two-nymph rig off a Pat's Rubber Legs through the deep runs and along the banks, or fish a Chubby Chernobyl hopper-dropper as the terrestrials come on in July. Streamers move the better browns in the walk-in stretches at Pumphouse and Radium. Best done as a raft/drift float (Pumphouse to Radium or State Bridge); wade access is limited to the BLM areas. Watch afternoon temps in a heat wave — start early.

Detailed report

Premier big-water fishery ~1 hr from Vail. Float-focused: Pumphouse is the main put-in (BLM fee site) with limited walk-and-wade; State Bridge / Radium are the takeouts. July brings stoneflies, caddis and the start of hopper season. Trip tip: a good big-water contrast to the smaller Gore and Eagle — bring or book a raft.

Report: Cutthroat Anglers · Early July — seasonal outlook (verify current report) · Cutthroat Anglers (Silverthorne)

Fly-shop reports

No shops connected for this river yet

Hatchwise doesn't yet have a fly shop linked to Colorado River — Pumphouse, so there was nothing to check — this isn't a shop reporting slow water. Live flow and temperature above are real and current.

Live flow and water temperature come from the USGS gauge. Shop reports appear here once a shop is connected to this water.

Fishability Score breakdown

How today's 64 is built. Flow 35% · Water temp 25% · Weather 20% · Hatch 20%.

Flow49/100
Water temp60/100
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 #6-8, 20-Incher Stone #8, Two-Bit Hooker #16, San Juan Worm

MiddayNOW
11am – 5pm

Chubby Chernobyl #8-10, Golden Stone #8, PMD #16, Caddis #14

Evening
5pm – dark

Streamers (sculpin/leech), Caddis #14-16, hopper-dropper as summer sets in

Species
Rainbow · Brown
USGS gauge 09058000

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 09058000 Colorado River — PumphouseSep 14, 11:15 AM MT · flow + temp live
Hatchwise Seasonal GuideHatch & fly guidanceJul 5, 12:00 PM MT · editorial
Fly-shop reportsShop-validated fly recsNo report found — searched

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