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Water Levels and Quality

Horseshoe Lake Water Levels

Please click here to see a full size graph of the lake water levels – this is the most recent summary of the water levels on Horseshoe over the last 8 years. As you will see we are currently trending to the lowest levels. The need for rain is also obvious. We cannot control the weather but we can limit our water consumption and ensure we are doing everything to keep phosphorous levels in check.

The Lake Partner Program

The HLA is a member of the Lake Partner Program - a province-wide, volunteer-based, water-quality monitoring program. Volunteers collect total phosphorus samples and make monthly water clarity observations on their lakes. This information will allow the early detection of changes in the nutrient status and/or the water clarity of the lake due to the impacts of shoreline development, climate change and other stresses.

Links to the results for Total Phosphorus and water clarity can be found at

Seguin Township “Water Quality Model Review”

An Open House was conducted on June 11th, 2016 to take public input on revisions to the Seguin Water Quality Model and the subsequent update to the Seguin Official Plan. Below is a condensed version of the Executive Summary.  The full report is available through the Township Office.
“In 2009, Seguin Township adopted an approach to managing shoreline development on 186 lakes to protect water quality from phosphorous enrichment. Central to the approach was the Seguin Water Quality Model (SWQM) which was developed and used to establish lake specific thresholds for phosphorous based on Provincial Water Quality Objectives and classifications of “Sensitivity” to phosphorous loads. Policies in the Official Plan prohibit development on Over Threshold lakes with High Sensitivity to phosphorous. Through the Official Plan, the Township has been able to make consistent, defendable, science-based decisions regarding shoreline development.
A review, update and refinement of the 2009 SQWM was completed to address new provincial guidance for managing shoreline development and to consider lake information collected as part of the Township’s Water Quality Monitoring Program. The updates are under review and will at some point in the fall of 2016 be adopted as part of the Official Plan
Based on the revised approach and updated SWQM, 53 of 120 lakes with surface areas >10ha were classified as Over Threshold. Thirty five (35) of the lakes that were Over Threshold were also classified as High Sensitivity. Additional shoreline development would not be permitted within 300 metres of 35 lakes that are Over Threshold and High Sensitivity.”
Horseshoe Lake and Virtue Lake continue to be classified as Over Threshold and High Sensitivity. This is good news as it relates to shoreline development.


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