South Boulder Creek River Report

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South Boulder Creek River Report

5-9-2025

Flows again, almost doubled back up from 86 to 153 CFS, which is still great news for the fish and fishing. Expect fish to start spreading out more with the flows, so make sure to do a few casts in the pocket water and smaller holes. With these higher flows, and slippery rocks, wading across is not recommended. Your primary hatch will be midges, and BWO's, and caddis.

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For dries, throw a Ms. Tickle Cripple in BWO, Superman Caddis, Purple Haze, Quill Midge, Micro Chubby, Roza's Red Butt Caddis, AR's BWO, Dry Humper, and Slick Midge.

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For subsurface presentations, use a Zebra Midge, Juju Baetis, Tag Perdigon, Rainbow Warrior, BTS Mysis, Flash Tail Egg, Boroff's Homie, Sow Bug, Simple PTN, SOS Nymph, Awero Baetis, Prarie Doggin' Caddis, Lil Bit, and a Barr's Emerger.

Guide Rating

4/5

Weather Experienced

- Temperature: Mid 60's

- Wind Conditions: Light breeze

- Precipitation: 30% chance of PM storms

Water Observations

- Water Temperature: Lower 40's

- Flow Level: 153 CFS

- Water Clarity: Near crystal clear

About South Boulder Creek Fly Fishing

South Boulder Creek has to be one of the most scenic rivers within a half hour of downtown Boulder. This creek starts up in the Indian Peaks near the Moffat Tunnel and gains momentum on its journey towards the cool deep waters of Gross Reservoir. Below Gross Reservoir, South Boulder Creek becomes a great tailwater flowing through the Walker Ranch open space. This area is the most popular section of the creek due to the great hatches and consistent flows through the summer months. The access to this section is fairly easy taking visitors up and over Flagstaff Mountain, onto a dirt road, and into the wilderness.

There is no road following the creek so if you are looking for some solitude this is the spot. The aquatic insect activity in this part of the creek is incredible, it sees hatches of Caddis, BWO’s, PMD’s, Midges and great Terrestrial fishing. South Boulder Creek might be your best chance for a big wild brown in Boulder County. Every year anglers routinely catch browns in excess of 18 inches. The river heads east through some public and private water before dumping into Eldorado Canyon State park. After the plunge pools of Eldorado, the creek mellows out upon entering the flats of Boulder and eventually joins Boulder Creek.