Catch the Hatch

Mayflies are important indicators of watershed health and are threatened by pollution and climate change. Join our team this summer from June 15- July 15. Record data on mayfly emergence and creek temperature at specific creek locations in the St. Vrain sub-basin. Becoming a data catcher means you will train with scientists and make observations on your own schedule! Learn more about project details here.

Click the steps below to get started!

Dave Rees, Timberline Aquatics

Catch the Hatch

Mayflies are important indicators of watershed health and are threatened by pollution and climate change. Join our team this summer from June 15- July 15. Record data on mayfly emergence and creek temperature at three creek locations in the St. Vrain sub-basin. Becoming a data catcher means you will train with scientists and make observations on your own schedule! Learn more about project details here.

Click the steps below to get started!

Sign up for a guided or self-guided virtual training

Sign up for gear pick-up

Sign up for observation location(s)

Join Catch the Hatch

Click on the map to see summer observation locations.

Catch the Hatch Virtual Training Options

Each volunteer is required to sign up and attend a one-hour training event, either Guided or Self-Guided. In each training, the Catch the Hatch team will cover a project overview, volunteer expectations, sampling timeline and procedures, and data entry. Please sign up for your preferred Guided training slot or Self-Guided option. All new volunteers should consider the Guided training option if possible.

Guided Virtual Trainings

Self-Guided Virtual Training

Gear Pick Up

We need to get your Catch the Hatch Gear to you! Please sign up for a local pick up location in either Boulder, Longmont or Lyons. Please sign up for a date that works for you using the button below!

Catch the Hatch Site Locations

Sign up for as many observation slots as you would like between June 15- July 15.

Boulder
Creek

Left Hand
Creek

North St.
Vrain Creek

Hatch charts from previous seasons

Catch the Hatch aims to track Pale Morning Dun mayfly emergence during their peak emergence window (June 15 through July 15) in relationship to environmental variables, such as flow and creek temperature, from year to year.

Take a look at the hatch charts below. Do you see any differences in the timing of emergence observations or the associated creek temperature or flow from year to year?

Left Hand Watershed Center’s Community Science Program aims to engage Front Range communities in place-based learning and scientific data collection about watershed health. Please learn more about our Community Science Plan or help support future projects!

Project News

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

Want to join the project and stay up to date on project news? Join the Catch the Hatch email list!

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