Watershed Conditions Statements

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…
May 7, 2018 –  The Flood Warning issued on April 30 for Bobs and Christie Lakes remains in effect. Levels on both lakes have declined slightly but both remain above the ‘Full Supply’ threshold at which damage can occur. This decline will continue for the next two days with no precipitation forecast. However, rain is forecast for Thursday and through next weekend with a possible five day total close to 55 millimetres. If this amount falls, water levels are likely to increase but the primary impact is expected to be on Bobs and Christie Lakes. Outflows from Bobs Lake are…
May 4, 2018 –  This message is an update to the RVCA flood warning of April 30. A weather forecast from the Ministry of Natural Resources and Forestry has the possibility of generalized rain up to 25 millimetres (mm). An additional 25 mm could fall in localized storm cells.  If the rain occurs as forecast, water levels can be expected to rise again throughout the watershed. However, no flooding is expected in the lower reaches of the system downstream of Smiths Falls. Water levels have continued to increase gradually on Bobs and Christie Lakes with some minor flooding of low-lying…
April 30, 2018 – This message is to update the status of flood conditions in the Rideau River watershed. No flooding is expected in the lower reaches of the system downstream of Smiths Falls although water levels can be expected to increase with rain forecast over the latter half of this week. Bobs and Christie Lakes continue to be at risk for flooding. Higher levels on Christie Lake in particular can be expected as necessary releases are made to control levels on Bobs. No rain today or Tuesday will help but, if rain forecast for Wednesday and beyond is received,…
April 28, 2018 – This message is specific to Bobs and Christie Lakes but may apply to other lakes in the area where remotely accessible monitoring equipment is not installed. Property owners are advised to go to their cottage properties and assess conditions for themselves. Rain overnight has caused levels on Bobs and Christie Lakes to increase to flood levels. Additional rain forecast for today (Saturday) and Sunday will cause further increases. Some relief is expected on Monday and Tuesday. More rain is forecast for later in the week that will slow the decline on both lakes. Levels of Bobs…
April 24, 2018 –  Water levels are expected to rise again in the Rideau River watershed as a result of meltwater from the last of the snow, flow from thawing soil and rain forecast for Wednesday and Thursday.  Daytime temperatures are expected to approach 20 degrees over the rest of the week and stay above freezing at night. This will cause the remaining snow in the upper watershed to melt and, along with thawing water from the soil, begin to work its way down through the system. Rain in the order of 20 to 30 millimetres is forecast for the…
April 18, 2018 –  The snow and ice accumulation over the last several days raises the possibility of flooding in parts of the Rideau system as warmer conditions arrive on Friday. Rain and some melting has caused streamflows to increase throughout the watershed. Daytime temperatures above 10 degrees through the coming weekend and into next week can be expected to melt the remaining snow and ice. There is the potential for this meltwater to cause access issues in the low-lying communities on the Long Reach of the Rideau between Kars and Kemptville. Tributary streams such as Stevens and Cranberry Creeks…
April 11, 2018 – A weather system out of the mid-west U.S. has the potential to bring several forms of precipitation in significant amounts in to eastern Canada over the next week. Snow, rain and freezing rain may fall beginning tonight with showers or flurries. Tomorrow, rain is forecast to fall through the afternoon. Rain is expected to begin again late on Friday morning and continue into Saturday, changing to snow in the early morning finishing with as much as 20 centimetres. Rain is presently expected to resume on Sunday and continue into Monday. If the full amount of forecast…
April 3, 2018 – Rain in the order of 20 millimetres is forecast for today and into the night that will cause water levels throughout the Rideau valley to increase beyond levels reached after rain on Saturday. How much levels increase will be limited by dropping temperatures and the changeover from rain to freezing rain or snow overnight and tomorrow. Peak flows from this weather are still expected to be less than average for the spring freshet. These may not be the actual freshet maximum flows. The Long Reach of the Rideau River, between Manotick and Kemptville, could have levels…
March 29, 2018 –  Barring a rain event not presently in weather forecasts, it is appearing that the spring freshet of 2018 in the Rideau valley may have already occurred on March 2 as a result of the above normal temperatures in the latter half of February that removed all of the snow. The snow that fell after the early March thaw, has gradually declined over the month with several sunny days and above freezing daily temperatures. With little snow and minor rainfall forecast, there is not expected to be enough runoff to cause significant increases in water levels in…
March 09, 2018

Spring Outlook

March 9, 2018 –The winter of 2017-18 has been one of wide variations and periods of record cold. First snow on the ground to start this winter was relatively early at the beginning of November but little more fell until after December 28 followed by the onset of the record cold temperatures including -30 degrees on January 1. After ten days of frigid temperatures, a few days of warm temperatures reduced the snow cover significantly. That warm spell ended with a flash freeze. Precipitation in all its forms and widely varying temperatures continued through January into mid-February. Since February 19,…
February 16, 2018 – Significant rainfall forecast for Monday and Tuesday along with melting snow can be expected to cause river flows and lake levels to rise. Going on iced over waterbodies is not advisable for the next several days until levels decline and colder temperatures can restore the integrity of the ice. As the snowmelt and rain runoff moves through the Rideau system, the ice cover can be expected to shift and, in some places, break up. This could lead to ice jamming at culverts and bridges which could cause localized flooding. Ponding water on the surface will make…
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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

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

Member of: conservation ontario