Watershed Conditions Statements

March 19, 2019 – Despite some gradual snow melting over the last two weeks, the snowpack throughout the Rideau Valley Watershed remains above average so there is still a potential for above average flooding this spring across the Rideau Valley Watershed, especially in low lying areas which have flooded in the past. However, the current weather forecast until end of March is indicating that daytime temperatures with single digit highs and below zero conditions at night with very little precipitation, so no significant flooding is anticipated in the next week or so.  This could change if the forecast changes (i.e.,…
March 6, 2019 – The winter of 2018-19 has been an old-fashioned winter with lots of snow (over 250 cm to-date) and no significant thaw events. As such, the snowpack throughout the Rideau Valley Watershed is well above average. Current conditions at several RVCA snow course sites are indicating near record water content amounts in the snow for this time of year, generally not seen since the late 1970s.  Based solely on the fact we have above average water content, there is a potential for above average flooding this spring across the Rideau Valley Watershed, especially in low lying areas…
January 21, 2019 — The current very cold weather and large snow storm yesterday is creating some localized ice jams which can cause significant fluctuations in water levels as ice builds and releases. More specifically, the RVCA has received reports of ice jams in the Tay River at Port Elmsley which is causing flooding of some residential properties. There may be other areas as well where ice jams have formed and are causing localized flooding, especially along the Tay River. Since ice jams can form anywhere that there is open water, it is difficult to predict where or when they can…
December 20, 2018 — A significant weather system is expected to cross through our area over the next two days. Environment and Climate Change Canada is forecasting up to 40 mm of rain starting tonight, Thursday, December 20 through Friday, December 21. The forecast calls for above freezing temperatures during the day on Friday. Water levels across the Rideau Valley watershed are generally normal to slightly below normal and the amount of snow cover is slightly below normal for this time of year. The forecasted heavy rain and warm air temperatures are expected to melt most of the snow on…
December 5, 2018 – This statement is to advise that the low water status in the Rideau River watershed is returned to “Normal” including the Kemptville Creek sub-watershed. Precipitation over the last month has brought stream flows up to historical averages throughout the Rideau watershed. Runoff from the rain and snowmelt caused levels to rise late in November. The impacts of low flows experienced throughout 2018, particularly in the Kemptville Creek subwatershed, will not be known until next spring. With inflows well below normal, fish and other inhabitants of the creek struggled to survive in the intermittent ponds left by the…
September 27, 2018 – This statement is to advise that the low water status in the Rideau River watershed has returned to “Normal” except for the Kemptville Creek subwatershed which is at “Minor” Severity, down from “Moderate” Severity. Rain over the last week pushed totals above what is normal for the time of year at most climate monitoring sites in the region. The forecast is indicating more rainfall next week that will begin to restore streamflows to historical averages. The exception is at the Environment Canada site in Kemptville which has a 90 day total at 67% of normal, well below…
September 14, 2018 –  This statement is to advise that the low water status in the Rideau River watershed is still at “Minor” Severity except for the Kemptville Creek sub-watershed which continues to be “Moderate” Severity. The overall watershed 30 day rainfall is at 72% of normal for the time of year. The 30 day rain measured at Kemptville College is at 42%. Rainfall is slightly higher in the headwater areas of Kemptville Creek but most appears to have infiltrated into the ground, rather than into the Creek, with flows just 1.3% of normal. Aquatic species will be increasingly stressed…
August 30, 2018 –  This statement is to advise that the low water status in the Rideau River watershed remains at “Minor” Severity except for the Kemptville Creek sub-watershed which continues to be “Moderate” Severity. Flow in Kemptville Creek has continued to be very low. The amount of rain measured in the Kemptville Creek sub-watershed for the same time period is well below the historical average at both Kemptville and at the Brockville Airport near the Creek headwaters The impact of the low flow is that aquatic creatures living in the Creek are confined to smaller and smaller pools that…
August 20, 2018 –  This statement is to advise that the low water status in the Rideau River watershed generally remains at “Minor” Severity except for the Kemptville Creek sub-watershed which has risen to “Moderate” Severity. Rainfall in eastern Ontario has been widely varied since late July. What rain that has fallen in the Kemptville Creek sub-watershed has had little effect on flows with much of it infiltrating into the soil and retained in wetlands. The Creek is down to intermittent pools in some sections. Beaver have been active, building dams that contribute to the ponding. At the same time,…
August 2, 2018 –  This statement is to advise that the low water status in the Rideau River watershed has been reduced to Minor Severity. Longer range forecasts indicate warmer and dryer than normal through the rest of the summer and into the fall. If that forecast comes to pass, flows and levels can be expected to fall well below normal. Present conditions are generally close to normal but because of declining flows and forecasts, the low water status is being reduced from Moderate to Minor Severity rather than being withdrawn entirely. Record rainfall was measured at several climate monitoring…
July 19, 2018 –  This statement is to advise that the low water status in the Rideau River watershed is now at Moderate severity. Rainfall in the last 90 days, measured at climate stations in and around the watershed, is about 60% of the normal amount for the time of year which is the threshold for Moderate Severity Low Water. Rain presently forecast for much of next week will be welcome but is not expected to have a significant impact. Longer range forecasts indicate temperatures above normal and precipitation below normal through the rest of the summer and into the…
July 10, 2018 –  This statement is to advise that present conditions in the Rideau River watershed are now at the threshold for Minor Low Water status under the Ontario Low Water Response Program. Rainfall in the last 90 days, measured at climate stations in and around the watershed, is about 80% of the normal amount for the time of year which is the threshold for Minor Low Water. The present heat wave with several daytime high temperatures above 30 degrees has burned lawns and wilted plants in gardens. Lake levels and streamflows are below normal for the time of year but are…
May 15, 2018 – By this statement the Flood Warning issued on April 30 for Bobs and Christie Lakes is terminated. The water level on Bobs Lake has receded to the ‘Full Supply’ threshold. No significant rain is presently forecast for the next four days. Therefore, levels on both Bobs and Christie Lakes can be expected to continue to recede toward normal summer levels over the rest of the week. Rain forecast for Saturday and Sunday is not expected to be enough to raise levels again. Caution is still needed around lakes and rivers with water still cold and above…
May 10, 2018 – The Mississippi Valley and Rideau Valley Conservation Authorities are advising residents that water levels appear to be stabilizing. Some nuisance flooding (Petrie Island, Boise Wood) has occurred. Rain that fell this morning was not enough to have an impact and there is no rain forecast for the next five days that would cause levels to increase again. Water levels will gradually decline to normal summer levels over the next two weeks barring the development of a significant weather system.. Note that streambanks are slippery along the Ottawa River, water is fast moving and still very cold.…
May 10, 2018 –  The Flood Warning issued on April 30 for Bobs and Christie Lakes remains in effect. Levels on both lakes continue to decline at the rate of about one centimetre per day. However, levels are still above the ‘Full Supply’ threshold at which damage can occur. Rain today is not expected to be sufficient to affect the decline of the lake levels and no rain is forecast for the next five days. Levels can be expected to recede to summer levels over the next week barring a significant weather system forming and moving through the region. Caution…
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Contact Us

Address:
Rideau Valley Conservation Authority
3889 Rideau Valley Drive
Manotick, Ontario K4M 1A5

Phone:
613-692-3571, 1-800-267-3504

Email:
info@rvca.ca

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Monday to Friday, 8:30 a.m. to 4:30 p.m.

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