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- Nutrient Management
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- Water Quality
GLSM Adaptive Management Plan (2023 Update)
The Lake Restoration Commission recently released its updated Adaptive Management Plan for Grand Lake St. Marys. The document details what has been accomplished from 2017 to 2022 and describes plans for the future.
Microcystin Levels
View current and historical microcystin levels in Grand Lake St. Marys here.
Grand Lake St. Marys Water Quality: 2021 in Review
Video from the November 2021 LIA member meeting, plus a Grand Lake St. Marys water quality PowerPoint presentation shared by […]
The Fishes of Grand Lake St. Marys
Grand Lake St. Marys water quality update & The Fishes of Grand Lake St. Marys presented by Wright State University-Lake Campus’ Dr. Stephen Jacquemin at the April 2021 Lake Improvement Association membership meeting.
Grand Lake St. Marys Water Quality Update – September 2020
Water quality update by Dr. Stephen Jacquemin, Associate Professor of Biology, Wright State University-Lake Campus.
Summary of GLSM Wetlands Monitoring 2019
Wright State University’s Dr. Stephen Jacquemin and Ag Solutions’ Theresa Dirksen gave an update on wetlands monitoring at the February 2020 Lake Improvement Association member meeting.
KDP Pilot Project Report
A pilot project designed to test a nutrient removal system for dairy and swine manure found the system capable of removing up to 85 percent of phosphorus from manure, a key contributor the nutrient runoff that causes algal blooms. The project was spearheaded by Ag Solutions in partnership with KDS Separation, Chemtron, and InNow Water & Environmental Services, Katharos Scientific, LLC, and a local farmer.
1960 Lake Study
A study of Grand Lake St. Marys from the year 1960.
Grand Lake St. Marys Constructed Wetlands Presentation
Wright State University’s Dr. Stephen Jaquemin presented an update on the constructed wetlands at Grand Lake St. Marys at the […]
Changes in Water Quality in GLSM Watershed Following Manure Application Regulations
These documents offer a summary and full report of the water quality changes in the Grand Lake St. Marys watershed following manure application regulations.
Adaptive Management Plan 2017
This file contains the updated Adaptive Management Plan created for Grand Lake St. Marys in 2017.
Ag Solutions: Potential Pilot Projects and Field Practices
This PDF is compiled from a presentation Ag Solutions Coordinator Theresa Dircksen gave at the April 2017 LIA member meeting. It includes technologies Ag Solutions is considering as pilot projects to reduce nutrient load in the watershed plus edge-of-field and field-level practices.
Prairie Creek Treatment Train Schematic Design Narrative
An overview of the treatment train at Prairie Creek near Grand Lake St. Marys. Featuring a project description, maps, photos, […]
Erosion Issues and Solutions
Erosion and sedimentation strip Grand Lake St. Marys of her shoreline and leave a thick layer of muck on the […]
Battelle Grand Lake St. Marys Assessment – Airy Gator Performance Report
The Battelle Grand Lake St. Marys Assessment – Airy Gator Performance Report details Battelle’s findings for Grand Lake St. Marys […]
FFT ECSIA Force Algae Control Sample Trials
FFT ECSIA Force Algae Control Sample Trials Microcystin and other trends
2015 Tourism Sales Report
2015 Tourism Sales Report, provided by the Auglaize/Mercer County CVB (http://www.seemore.org).
Grand Lake St. Marys Water Quality Improvement Initiatives
Learn more about the steps being taken to improve the water quality in Grand Lake St. Marys. Download Grand Lake […]
Grand Lake HABs
Eugene Braig, Program Director, Aquatic Ecosystems at The Ohio State University College of Food, Agricultural, and Environmental Sciences shares in-depth […]
A Plant Evolution: Mycorrhizal Fungi
Learn how fungi might be able to increase nutrient absorption in crop plants, thus reducing nutrient runoff and improving water […]
Frequently Asked Questions
What issues does Grand Lake St. Marys face? Lake water quality is degraded by nutrient runoff, namely phosphorous, from multiple […]
Fact Sheet: Grand Lake St. Marys Toxins
Ohio EPA has identified three known toxins in Grand Lake St. Marys, each a result of biological processes in blue-green […]
Grand Lake St. Marys Restoration Commission Action Plan
A comprehensive study, plan and associated strategies to restore Grand Lake St. Marys. Read how Grand Lake St. Marys will […]
Pollution Issues and Solutions
The following indentifies several pollution issues affecting the watershed and details possible solutions to reduce pollution on Grand Lake St. […]
US EPA National Eutrophication Study
This United States Environmental Protection Agency national study looks at Grand Lake St. Marys lake and drainage basin characteristics, water […]
Alum Application Report
The purpose of this report is to provide an assessment of the effect of the partial lake sediment P inactivation […]
SB 150 Summary
Div. of Soil and Water's Terry Mescher presented this overview of Senate Bill 150 at the February 2014 LIA member […]
GLSM Watershed Update
ODNR Dept. of Soil and Water's Terry Mescher and Frances Springer gave the following presentation to the Lake Improvement Association […]
Toxic Algae: Coming Soon to a Lake Near You?
This report, released jointly by Resource Media and the National Wildlife Federation, details the impact of toxic algae not just […]
Tetra Tech Recommendations
DOWNLOAD FILE This action plan describes the potential actions needed to improve water quality in the lake and to meet […]
Benefits of Saving Grand Lake St. Marys
Saving Grand Lake St. Marys will usher in a new era of prosperity for all who live, work, and play […]
LIA Powerpoint Presentation
Learn more about Grand Lake St. Marys and what is needed to be done to restore this Ohio lake in […]
Rutgers Lake and Pond Restoration Report
A report published by Rutgers University that covers lake and pond restoration strategies, applicable to Grand Lake St. Marys. Lake […]
Sedimentation Water Quality Survey
Learn more about how sedimentation affects water quality in Grand Lake St. Marys. Download Sedimentation Water Quality Survey
Lake Scientist Website
Lake Scientist is a website dedicated to being an online source for lake science and technology. On this website you […]
Fact Sheet: Issues and Solutions
A quick-reference fact sheet that examines the causes of the Grand Lake St. Marys situation and lists potential solutions that […]
Watershed Maps
Download and view Grand Lake St. Marys and Wabash Watershed maps. Download Watershed Maps
Grand Lake St. Marys Lake Improvement Docs
Grand Lake St. Marys Lake Improvement (large file, may take several minutes to download) Summary of Documents 1. Grand Lake […]
Ohio Lake Erie Phosphorus Task Force Final Report
Learn more about how phosphorus is playing a role in Lake Erie as well as Grand Lake St. Marys in […]
What is the LIA Doing to Help Save Grand Lake St. Marys?
The Lake Improvement Association is undertaking several initiatives that, when implemented with the coorporation of the community at-large, will restore […]
Restoration of a Canal Lake
In this two-part report you will learn about the issues faced by canal lakes and actions that are needed to […]
Misconceptions About Grand Lake St. Marys
Misconception #1: Grand Lake St. Marys will right itself. Grand Lake St. Marys has toxic water due to the presences […]
Lake Restoration Commission Action Plan
Learn what the Grand Lake St. Marys Restoration Commission's plan is for restoring Grand Lake St. Marys in this report, […]
Your Personal Action Plan
Download your Personal Action Plan for Saving Grand Lake St. Marys! Check off each activity as you complete and feel […]
LIA Education Series
Welcome to the Lake Improvement Association’s Education Series. View each installment to learn more about Grand Lake St. Marys, what […]
OSU Ohio Manure Management Guide
Proper nutrient management is essential to saving Grand Lake St. Marys. The Ohio State University has prepared a bulletin (604-606) […]
Legislative Issues and Solutions
Grand Lake St. Marys is officially owned by the State of Ohio, which means that legislative and enforcement falls under […]
All About Ohio’s Algal Blooms
In this report by ODNR, The Ohio State University Extension, and Ohio Sea Grant, you'll learn all about what causes […]
Survey Report for Flood Control and Allied Purposes
Learn more about flood control for Grand Lake St. Marys in this report. Download Survey Report for Flood Control and […]
Wright State University Presentation
A presentation given by Wright State University on the topic of Grand Lake St. Marys. Download Wright State University Presentation
Watershed In Distress Fact Sheet
This fact sheet offers detailed information regarding the laws and regulations for distressed watersheds in the state of Ohio, including […]
Watershed Information
This series of documents explain in detail the watershed surrounding Grand Lake St. Marys, issues and solutions, and a Watershed […]
Managing Agricultural Phosphorus for Water Quality Protection
Click the attached file to read the entire report Abstract: Background The eutrophication of aquatic systems due to […]