Catch the Hatch

Mayflies are important indicators of watershed health and are threatened by pollution and climate change. Learn more about our Research Questions here.

Dave Rees, Timberline Aquatics

Catch the Hatch

Mayflies are important indicators of watershed health and are threatened by pollution and climate change. Learn more about our research questions.

Become a Citizen Scientist!

Collect data on adult Pale Morning Duns during their peak emergence from June 15 through July 15. You will be visiting one to three sites along North St. Vrain, Left Hand, and Boulder Creeks. Click on the map to see location or for detailed directions.

Step 1:

Sign up for a training event either June 1 (at part of Trout Unlimited’s Pig Roast celebration, 1-230pm) at Rocky Mountain Anglers or June 6 (5:30-7pm) at Left Hand Brewery. We will provide you with all the information and tools needed to successfully participate.

Step 2:

Sign up for observation days at one or more Catch the Hatch sites from June 15 through July 15. You can visit these sites between 11am and sundown, see our Observation Day Overview for more details!

Project News

My Watershed App: Community-Powered Watershed Science!

My Watershed App: Community-Powered Watershed Science!

Want to collect watershed science data? There's an app for that!   Join Left Hand Watershed Center's community science program and help track watershed health! All you have to do is sign up and download the My Watershed app!   2019 Program Offerings: Run Off...

Catch the Hatch Begins June 15!

Catch the Hatch Begins June 15!

We will be tracking emergence of Pale Morning Dun (PMD) mayflies this summer! Catch the Hatch is one of our Community Science Program's projects, and we have over 30 volunteers geared up and ready to go for the pilot year. Collectively, we will be visiting sites on...

Catch the Hatch! Become a citizen scientist!

Catch the Hatch! Become a citizen scientist!

Join us this summer to Catch the Hatch! This new project will track mayfly emergence in Boulder, Left Hand, and St. Vrain Creeks to help inform watershed health. As you know, mayflies are sensitive to pollution and changing climate. A lot of great organizations sample...

Project Materials