Catch the Hatch

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

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.

We are preparing for our 2021 Catch the Hatch season!

If you are interested in joining our Catch the Hatch project this year, please submit your contact information below. We will follow up with information on trainings and observation sign-ups!

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Join the Catch the Hatch email list!

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    Click on the map to see summer observation locations.

    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 2019 Summary

    Catch the Hatch 2019 Summary

    Project Summary Total Volunteers: 31 Total Site Visits: 71 Total PMD Sightings: 14 Total Observation Hours: 104 Left Hand Creek Summary Site Visits: 26...

    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...

    Project Materials