Council authorizes hydro-raking of White Park Pond after state approval, councilors warned seed bank may persist

Parks and public-works staff asked for and received council authorization Monday to hydro-rake White Park Pond following state approval that made that approach allowable in lieu of a full dredge.

David Gill, director of parks and recreation, explained that hydro-raking is a more aggressive alternative to mechanical harvesting (removing surface plant matter) and that hydro-raking removes much of the sediment and roots. He said the city's CIP includes funding (CIP 51) and that the state agreed hydro-raking is an allowable method for restoring the pond.

Councilors pressed technical questions about the invasive lotus seed bank and the likelihood of recurrence. Gill and wetlands specialist Garrison Beck cautioned there is no guarantee that any dredge or hydro-rake will permanently remove all lotus seeds, noting seeds can remain dormant for more than a decade. Staff also warned that dewatering dredged material on site would produce odors; the work is planned for cooler weather to minimize smell and other impacts.

Council authorized staff to proceed with hydro-raking by motion and voice vote. Staff said the work will include monitoring and early-removal-of-new-growth tasks after the operation so the city can respond quickly if plants reappear.

Budget/scale: Council discussion referenced possible dredge cost ranges and CIP funding; staff said hydro-raking is a lower-cost option than a full dredge and noted the CIP included funds for the project this year but cautioned continued monitoring and potential follow-on costs.