Grand Lake St. Marys State Park Update – May 2025

Grand Lake St. Marys State Park Manager David Faler gave an update about the park at the May 2025 Lake Improvement Association member meeting.

Ag & Natural Resources Update – May 2025

Mercer County Agriculture & Natural Resources Director Theresa Dircksen offered an update at the May 2025 Lake Improvement Association member meeting.

Grand Lake Fish Hatchery Presentation

The fish hatchery's Jessica Break offered a presentation about the fish hatchery at the May 2025 Lake Improvement Association member meeting.

VIDEO: Grand Lake Oil History

Mercer County Historical Society Director Cait Clark gave a presentation on Grand Lake's oil history at the April 2025 Lake Improvement Association meeting.

VIDEO: Water Quality Updates April 2025

Wright State University Lake-Campus Biology Professor Dr. Stephen Jacquemin provided a water quality update at the April 2025 Lake Improvement Association member meeting.

STUDY: Coldwater Creek Wetland Reduces Nutrient Load by Over 60%

A recent study published in the Wetlands science journal examined the long-term impact of the Coldwater Creek Restored Wetland on water quality within the Grand Lake St. Marys watershed.

Knowledge Base

The Lake Improvement Association knowledge base features reports, data, statistics, action plans, and more learning resources.

LIA Educational Series

Welcome to the Lake Improvement Association's Education Series. View each installment to learn more about Grand Lake St. Marys.

Minutes

Minutes from the monthly LIA Member Meeting, held at 10 a.m. every first Saturday of the month at the Celina Moose.

Photo Gallery

Check out fun photos from past Lake Improvement Association events! Find your own photos - and photos of your friends!

Help Fight H2Ohio Budget Cuts

Write to your senator to oppose H2Ohio budget cuts that could impact Grand Lake’s water quality

Pontoon Raffle

Enter to win a 2025 Viaggio pontoon valued at $57,812.

Upcoming Events

Boardwalk Boat & Bike Show

Ultimate Boat Racing Experience

Bar Stool Open 2025