Deep Creek Lake Hydrilla Treatments

Hydrilla is a fast-growing aquatic invasive plant that scientists first found in Deep Creek Lake in 2013 and that the Maryland DNR has been treating with a herbicide annually since 2014. The herbicide treatment takes place each summer and is again planned for the summer of 2023. For an overview of treatment locations and plans, including other information related to the treatment process, please visit the Deep Creek Lake Natural Resource Management Area website.

People in the affected areas are asked to stay clear of the treatment boat while it is underway so that the proper dosage of herbicide can be administered. Once applied, there are no recreational restrictions associated with the herbicide.

The 2023 planned herbicide treatment dates are as follows:

Tuesday, June 13—First hydrilla treatment
Wednesday, July 5 (estimated)—Second hydrilla treatment
Tuesday, July 25 (estimated)—Third hydrilla treatment
Tuesday, August 15 (estimated)—Fourth hydrilla treatment

The above dates are weather dependent. Any updates or changes to the dates will go out via the department’s automated email system. If you were forwarded this email and would like to sign up to receive updates via the e-mail distribution list, please register on the DNR website.

A map of the treatment locations is below:

Deep Creek Lake Hydrilla Herbicide Treatment Schedule for 2022

Any questions concerning the hydrilla control program can be addressed to Mark Lewandowski at