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St. Johns Riverkeeper intern Zoe Tressel gestures as Jessica Finch, center, and Soraya Aidinejad gather tools for measuring river grasses in Welaka on Thursday. (CASMIRA HARRISON/Palatka Daily News) -
A map included in a St. Johns River Water Management District presentation shows how the river grasses have evolved over time. (Courtesy of Erich Marzolf/St. Johns River Water Management District) -
Riverkeeper Lisa Rinaman holds some muskgrass found in the St. Johns River in Welaka Thursday. (CASMIRA HARRISON/Palatka Daily News) -
St. Johns Riverkeeper Lisa Rinaman, left, explains the varied levels of salinity and turbidity (river clarity) in the St. Johns River at Downtown Park in Welaka on Thursday. (CASMIRA HARRISON/Palatka Daily News) -
From left, Jessica Finch, Lisa Rinaman, Soraya Aidinejad watch as Zoe Tressel takes a water sample from the St. Johns River in Welaka on Thursday. (CASMIRA HARRISON/Palatka Daily News) -
Riverkeeper intern Zoe Tressel, left, discusses findings in the St. Johns River with Jessica Finch, right, the Riverkeeper's Putnam County community engagement coordinator, in Welaka on Thursday. (CASMIRA HARRISON/Palatka Daily News) -
St. Johns Riverkeeper Lisa Rinaman, foreground, explains to several nearby residents what her team was doing in the river in Welaka on Thursday as resident Mary Edwards, right, waches the team gather data on river grasses in the St. Johns River. (CASMIRA HARRISON/Palatka Daily News)
WELAKA — The aquatic grasses in the St. Johns River haven't "bounced back" to relative abundance after several storms like they have in years past.
The higher water levels and darker water, caused…