Lake Simcoe Shoreline Status

LAKE SIMCOE SHORELINE STATUS – LOW RISK – Update

Replaces Shoreline Hazard Watch – Moderate Risk

Lake Simcoe Region Conservation Authority

120 Bayview Parkway, Newmarket, Ont., L3Y 3W3

Telephone: (905) 895-1281 Fax: (905) 853-5881

Issued to the following groups:

1)         Municipalities and Local Conservation Authorities

2)         School Boards, Police and Media

3)         Chippewas of Georgina Island First Nation

4)         LSRCA Board of Directors and all LSRCA Employees

Date:   June 29, 2026

Time:   2:30 p.m.

The Lake Simcoe Region Conservation Authority advises that water levels in Lake Simcoe continue to recede and are approaching seasonal ranges. The lake level currently remains approximately 7 centimetres above average for this time of year. Forecast rainfall over the next several days may result in minor fluctuations in water levels; however, significant shoreline impacts are not anticipated.

Water levels have steadily declined through June and continue to trend toward seasonal values. Rainfall amounts are expected to remain relatively modest through Thursday, with approximately 3 mm per day forecast. More significant rainfall is possible on Friday and Sunday, with approximately 10 mm forecast on each day. These rainfall amounts may result in minor short-term increases in lake levels but are not expected to significantly alter current shoreline conditions.

The current forecast indicates southerly winds of approximately 14 km/hr, with gusts up to 40 km/hr for today (June 29). Over the next few days, there is variability expected in wind direction, including northwest winds on Friday and Saturday, which may put increase pressure on the southeast shoreline of the lake. Given the declining lake levels and relatively moderate wind conditions, wind and wave impacts are expected to be localized and limited.

Lake Simcoe Water Level

Currently, the lake level is approximately 7 centimetres higher than average for this time of year and continues to slowly recede toward seasonal values. Parks Canada is continuing to actively manage water levels on Lake Simcoe. The current water level in Lake Simcoe is 219.16 m and is expected to continue approaching seasonal values in the coming weeks, with only minor fluctuations in response to smaller rainfall events. Any significant rainfall events are still expected to put an upwards pressure on lake levels.

The following is a summary of the recent water levels on Lake Simcoe:

June 29, 2026 (current): 219.16 m

June 02, 2026: 219.20 m

May 20, 2026: 219.27 m

May 09, 2026: 219.31 m

April 20, 2026: 219.41 m

April 15, 2026: 219.28 m

March 31, 2026: 219.06 m

Water Safety

Please exercise extreme caution around all bodies of water. Please alert any children under your care to stay away from all watercourses and other bodies of water; and supervise their activities.

Residents, especially in the historically flood-prone areas, are advised to take necessary precautions to protect themselves, their pets, and their property.

This Shoreline Hazard Status – Low Risk will be in effect through July 20^th, 2026, at 12:00 pm, or until otherwise updated. This replaces the Shoreline Hazard Watch – Moderate Risk statement issued on June 19, 2026.

For further information, please contact the following person at (905) 895-1281:

Khashayar Saniei, M.Eng.

Duty Officer

Shoreline Hazard Status – Low Risk: 

• potential for minor localized shoreline flooding due to high lake levels with minimal impact or disruption
• minor local drainage issues