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River Ranger Marco Keller

River Rangers signing up volunteers

You are never too old... or too young to become a water quality monitor with the San Marcos River Rangers. Marco Keller, an eighth grader at Miller Middle School, has been testing the river since he was eleven years old -  taking water samples, checking dissolved oxygen levels and recording field observations. 
In that time, Marco has seen some major changes at his site in Ramon Lucio Park which was hit hard by flooding in 2015. The bridge where sampling was done washed away and the park covered in debris. But as soon as the park reopened, Marco staked out a new sample point and continued monitoring.
He has even adopted a second site at the Meadows Center. He admits he has become much more conscious of how rain and runoff affect his site and knows that his data helps people better understand the river and can get problems fixed faster. Mainly, Marco enjoys the chance to go to the river all year long and wants to do what he can to help keep  the San Marcos River clean and clear.
Marco is also a member of the Miller Band, the National Junior Honor Society and the Science UIL team. 
For more information visit

• Submitted by Rachel Sanborn/San Marcos River Rangers

San Marcos Record

P.O. Box 1109
San Marcos, Tx 78666
Phone: 512-392-2458
Fax: 512-392-6483