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.

Help Fight H2Ohio Budget Cuts: Write Your Senator

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

LIA Donates $500 for Grand Lake Crappie Series

The Lake Improvement Association recently donated $500 to sponsor this year’s Grand Lake Crappie series. We support events like this

LIA Donates $5,000 to Governor’s Cup Regatta

The Governor’s Cup Regatta will be back on Grand Lake this June 21 and 22! The Lake Improvement Association recently

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!

May 3: Fish Hatchery Presentation

Discover the history & inner workings of the St. Marys Fish Hatchery at May’s LIA meeting.

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

St. Marys Fish Hatchery Presentation: LIA Meeting

Boardwalk Boat & Bike Show

Ultimate Boat Racing Experience

Bar Stool Open 2025