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Eagan water resources manager says long-term monitoring shows improving lake quality, warns of chloride and invasive risks

Eagan Advisory Parks and Recreation Commission · January 26, 2026
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Summary

Jenna Olsen, Eagan’s water resources manager, told the Parks and Recreation Commission that long-term monitoring shows overall improvement in the city’s index lakes but flagged ongoing risks from chloride, invasive species and climate-driven seasonal shifts. She outlined monitoring, treatment and community outreach plans.

Jenna Olsen, Eagan’s water resources manager, told the Parks and Recreation Advisory Commission that long-term monitoring shows steady improvement in the city’s index lakes while cautioning that chloride, invasive species and changing seasonal patterns remain threats.

Olsen said Eagan monitors a cross-section of its larger, shallow lakes twice a month from June through September for chlorophyll a, total phosphorus, Secchi clarity and dissolved oxygen. "Eagan has just over 1,300 water bodies across its 34 square mile area," Olsen said, noting the city’s program has gathered data since the 1990s and uses that record to guide management.

Why it matters: the monitoring program underpins decisions on in-lake treatments, stormwater management and…

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