Folder Water Levels

pdf WL-1 Georgian Bay Casebook of Low Water Impact, comprehensive 2012-2013

The harms caused by Low Water Levels in Georgian Bay 2012-2013

Authors:  Mayors and leaders from around Georgian Bay

Author Affiliation: Georgian Bay communities

Journal: Georgian Bay Case Book; March 7, 2013

Abstract: The impact of declining water levels on the Great Lakes has been studied by many Georgian Bay groups over the past decade. These studies have assembled significant amounts of scientific fact, proposed a number of underlying causes and considered possible solutions. This international process continues and it is hoped will eventually develop a course of action to better manage the water in the Great Lakes.

pdf WL-3 Combating Invasive Species in the Les Cheneaux Watershed_Great Lakes Coastal Resilience Planning Guide

Combating Invasive Species in the Les Cheneaux Watershed

Author: Bridget Faust

Author Affiliation: Association of State Floodplain Managers

Journal: Great Lakes Coastal Resilience Planning Guide; February 14, 2014; May 2016 updates appear in the “Awareness” and “Strategy” sections of the case study

Abstract: The objective of this paper is to demonstrate how low water levels and invasive species have adversely impacted the Les Cheneaux Watershed, describe the different strategies used by the community to combat them, and provide communities with the decision support tools necessary to decide when and how to manage invasive species.

pdf WL-4 IJC 2017 Draft Report: Great Lakes Water Quality

IJC 2017 Draft Report: Great Lakes Water Quality

Authors: The International Joint Commission (IJC) (individual authors unnamed)

Author Affiliation: The International Joint Commission (IJC)

Journal: The International Joint Commission Pursuant to Article 7 (1) (k) of the 2012 Great Lakes Water Quality Agreement; January, 2017

Abstract: The IJC has developed this draft triennial assessment report, informed by a larger staff developed technical appendix that includes fuller analyses, technical information, discussion of relevant science and references. This report and the staff technical appendix report will be revised after consideration of comments received from the public.
The final report will be submitted to the Parties and will also be useful to other levels of government, nonprofit environmental organizations, and all citizens who care about the well-being of the lakes.

To comment on the report, use this the IJC link:

pdf WL-5 Synopsis for Phytoplankton and Lake Level

Synopsis for Phytoplankton and Lake Level

Authors: R. Smith

Author Affiliation: LCWC

Journal: Unpublished Report; March 2017


The LCWC studies nutrients in the water, primarily phosphorus, and the density of free-floating algae, phytoplankton, to get an idea of what the season’s weed growth might be like. More nutrients means more weed growth. Less nutrients translates to less weed growth. The phytoplankton are also monitored because they also reflect the nutrients available that might trigger dense algae blooms in the water, turning it to pea soup as has long been a problem in Lake Erie. From 2013 to the end of 2015 we experienced a 37 inch rise in lake levels. An unprecedented lake rise for a two year period. To experience another three feet of water means that the nutrients in those channels and bays have essentially be diluted by about 30%. What effect does that amount of dilution have on the weed growth, phytoplankton growth and availability of nutrients? That is what the paper “ Phosphorus and phytoplankton dynamics in the Les Cheneaux Islands during a rapid rise in Lake Huron water level” 180416 adresses.

pdf WL6 Water level expectations for 2019 Roger Gauthier 10 March 2019

Water Level Expectations for 2019

Authors: Roger Gauthier

Author Affiliation: LCWC

Journal: Unpublished Report; March 2019


Water levels in the Les Cheneaux region are projected to be at least 2" higher this summer than last year. Very heavy snowpack across the northern Great Lakes could push water levels even higher than current estimates, potentially causing damage to shore property and structures.

pdf WL7 Great Lakes Update - Diversions in the Great Lakes Basin

Great Lakes Update April 2020


Authors: USACE Detroit

Author Affiliation: US Army Corp of Engineers

Journal: Flyer



 The diversion of Great Lakes water to locations both inside and outside of the Great Lakes basin has been source of concern and questions for many years. This article will investigate the history of these diversions and highlight their present day use.

pdf WL8 Baird Report Prediction on Lake Levels Michigan-Huron, Erie

Authors: W.F. Baird Associates Coastal Engineers Ltd.

Author Affiliation:

Journal: Report for Georgian Bay Great Lakes Foundation



An analysis of the historic water level fluctuations between 1850 and 2016 was completed for Lake Erie and
Lake Michigan-Huron, based on historical records, to determine the major harmonic constituents with periods
less than about 60 years. These data were supplemented with paleo lake levels derived from beach ridge
records and reconstructed lake levels from tree-ring chronologies.