St. Vrain Creek

Flow now

St Vrain Cr Blw Boulder Cr At Hwy 119 Nr Longmont, 13 mi from the river.

44cfsat build, Nov 12, 11 AM MT

The typical week here, from 10 years of record: 93 cfs to 133 cfs, around 104 cfs.

Also gauged at Left Hand Creek At Hover Road Near Longmont, CO: 4 cfs, Nov 12.

Snowpack

0.1 in of water in the snow at Copeland Lake and 2 more stations, against a median 0.8 in for the date (13 % of normal).

The snowpack here usually builds from Nov 19, peaks Mar 8 and is gone by Apr 9; runoff follows the melt.

The season, November

Usually workable this week. Pick your window and fish it well.

• Midgessizes 18 to 22
• Small eggs and worms
• Pheasant tail and zebra midge nymphsunder an indicator

Typical for the week over 10 years: 93 to 133 cfs. Running 44 cfs today, below that range. Flows are not forecast; check the gauge the day before.

Brown Trout are spawning (October to December). Stay off clean, light-coloured gravel in riffle tails and pool tailouts, and leave paired fish alone.

Brook Trout are spawning (September to November). Stay off clean, light-coloured gravel in riffle tails and pool tailouts, and leave paired fish alone.

Mountain Whitefish are spawning (October to December). The egg bite behind spawning whitefish is the best winter nymphing of the year: an egg pattern below the riffles.

• Egg patterns in the runs below the spawning gravel, never on it.

Written by the app's rules engine from the calendar, the gauge record and the snowpack, not by hand, so it says only what the data says. The weather for the week comes with the app.

Fly shops on this water

• Front Range Anglers BoulderWebsite
• Rocky Mountain Anglers BoulderWebsite

Nearby waters

• Boulder Creek13 mi
• Big Thompson River14 mi
• South Boulder Creek16 mi
• Fall River25 mi
• Cache la Poudre River33 mi
• Bear Creek39 mi

Every Colorado water