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Water Conditions Statement: Water Safety — Lower Ottawa River March 18, 2024 — A Water Safety Statement is being issued for areas along the Lower Ottawa River (Arnprior to Hawkesbury). This winter has been characterised by unseasonably warm temperatures, below-average precipitation in many locations and several melt events. As of mid-March, the amount of water in the snowpack is well below average for this time of year across the Ottawa River watershed. The snow is essentially gone in the south-east portion of the basin and well below average elsewhere for this time of year. Environment Canada is forecasting cooler, more seasonable,…
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Watershed Conditions Statements
April 14, 2024
Water Conditions Statement: Flood Outlook — Lower Ottawa River | Risque de crue – Cours inférieur de la rivière des Outaouais
Water Conditions Statement: Flood Outlook — Lower Ottawa River April 14, 2024 — A Flood Outlook Statement is being issued for areas along the Lower Ottawa River (Arnprior to Hawkesbury). Based on a large weather system from Texas that brought 15 to 75 mm of precipitation over much of the Ottawa River basin between April 11 and 13, levels and flows along the Ottawa River have begun increasing due to spring runoff. Residents along the shores of the Lower Ottawa River should be aware that throughout the spring freshet period water levels can rise rapidly at times and cause minor flooding…
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Watershed Conditions Statements
April 20, 2023
UPDATE #1: Flood Warning — Lower Ottawa River | Mise à jour no 1 : Avertissement de crue – Cours inférieur de la rivière des Outaouais
Water Conditions Statement: Flood Warning — Lower Ottawa River April 20, 2023 — This FLOOD WARNING statement is an update to the Flood Warning issued for areas along the Lower Ottawa River (Arnprior to Hawkesbury) on April 17th, 2023. Water levels are expected to continue rising within the Ottawa River Basin due to snowmelt, combined with forecasted rainfall starting Friday and continuing over the weekend. Most of the water currently entering the Ottawa River is originating in areas where there are no reservoirs or retention capacity. The Ottawa River Regulating Committee is managing principal reservoirs to reduce river flows to downstream…
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Watershed Conditions Statements
Water Conditions Statement: Flood Warning — Lower Ottawa River May 10, 2023 — This FLOOD WARNING statement is an update to the Flood Warning issued for areas along the Lower Ottawa River (Arnprior to Hawkesbury) on May 2nd, 2023. Water levels along the main stem of the Ottawa River reached peak levels on May 5th and 6th due to above normal snow melt in the upper region of the basin this spring, combined with large regional rain events that occurred over several days in late April and early May. Based on Ottawa River Regulating Committee forecasts, it is expected that water levels…
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Watershed Conditions Statements
Water Conditions Statement: Water Safety — Lower Ottawa River May 18, 2023 – The Flood Warning for the Ottawa River issued on May 10, 2023 has been downgraded to a Water Safety Statement. Water levels along the Lower Ottawa River from Gatineau to the Grenville/Hawkesbury area are expected to continue decreasing over the coming days. Based on Ottawa River Regulating Committee forecasts, Ottawa River water levels are declining, and the rate of decline is slowing as they reach normal summer targets. There is no snow remaining in the watershed and reservoirs are now targeting summer levels. No significant rain is forecasted for the…
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Watershed Conditions Statements
Water Conditions Statement: Flood Warning — Lower Ottawa River May 2, 2023 — This FLOOD WARNING statement is an update to the Flood Warning issued for areas along the Lower Ottawa River (Arnprior to Hawkesbury) on April 28th, 2023. Water levels are expected to rise again within the Ottawa River Basin due to significant rainfall received over the past few days. Runoff from this rain event will bring additional water volumes to the Ottawa River at a time when levels are already near major flood thresholds. Based on Ottawa River Regulating Committee forecasts, flood prone areas along the main stem…
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Watershed Conditions Statements
April 28, 2023
UPDATE #2: Flood Warning — Lower Ottawa River | Mise à jour no 2 : Avertissement de crue – Cours inférieur de la rivière des Outaouais
Water Conditions Statement: Flood Warning — Lower Ottawa River April 28, 2023 — This FLOOD WARNING statement is an update to the Flood Warning issued for areas along the Lower Ottawa River (Arnprior to Hawkesbury) on April 20th, 2023. Water levels are expected to rise again within the Ottawa River Basin due to significant rainfall forecasted Saturday through Tuesday. Runoff from this rain event will bring additional water volumes to the Ottawa River at a time when levels are already near major flood thresholds. The Ottawa River Regulating Committee is managing principal reservoirs to reduce river flows to downstream areas. The…
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Watershed Conditions Statements
April 06, 2023
Flood Outlook — Lower Ottawa River | Perspective de crue – Cours inférieur de la rivière des Outaouais
Water Conditions Statement: Flood Outlook — Lower Ottawa River April 7, 2023 — A Flood Outlook Statement is being issued for areas along the Lower Ottawa River (Arnprior to Hawkesbury). Based on forecasted higher temperatures and anticipated snow melt, levels and flows along the Ottawa River are expected to increase over the next few days, marking the beginning of the spring freshet in the Ottawa River basin. Snow cover varies significantly across the 146,300 km2 Ottawa River basin, with several areas experiencing above average snow water content. Based on current weather forecasts, minor flooding may occur in low-lying areas generally susceptible…
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Watershed Conditions Statements
April 27, 2022
Updated: Flood Outlook — Lower Ottawa River | Perspective de crue – Cours inférieur de la rivière des Outaouais 2022
Water Conditions Statement: Flood Outlook — Lower Ottawa River April 27, 2022 — The Flood Outlook Statement issued on April 14th is still in effect for areas along the Lower Ottawa River (Arnprior to Hawkesbury). Water levels and flows on the main stem of the Ottawa River are expected to increase in most locations over the next few days in response to combined snowmelt from the northern part of the basin and recent rainfall. Levels are expected to be similar to those experienced about one week ago in most locations before starting to decline. Reservoirs throughout the basin are being…
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Watershed Conditions Statements
December 30, 2022
WATER SAFETY STATEMENT - Water Safety Statement Extended Due To Prolonged Warming Trend and Forecasted Rainfall
(WCS – R10/2022) December 30, 2022 – The Rideau Valley Conservation Authority is extending the Water Safety Statement issued on December 21, 2022 due to a prolonged warming trend and forecasted rainfall over the next few days. Above zero temperatures are expected to continue late into next week, with forecasted rainfall of 20-30 mm through the weekend. These conditions will likely accelerate the release of the existing snowpack and will result in increased flows and water levels throughout the Rideau Valley watershed. With rising water levels expected over the next few days, ice cover on lakes, ditches, local streams, and…
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January 12, 2023
FLOOD OUTLOOK - Elevated Water Levels Expected to Continue for Christie Lake and Tay River Region
(WCS – R01/2023) January 12, 2023 – After gaining and losing a large amount of snow over the holiday season, the short-term forecast is calling for between 15 and 30 cm of snow starting Thursday, Jan. 12 through late Friday, Jan. 13. Elevated water levels/flows are now declining across most of the watershed after above-average temperatures and precipitation caused a spike at the end of December and early January. But water levels in the upper watershed reservoir lakes, specifically Bobs and Christie Lake, are above average and continue to increase. The conditions are being monitored closely by Parks Canada staff. A FLOOD…
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Watershed Conditions Statements
(WCS – R03/2023) RIDEAU VALLEY, March 23, 2023 – A cool March combined with above-average snowfall amounts this winter means the snowpack is higher than average for this time of year across much of the Rideau Valley Watershed. This creates potential for above-average flooding in all low-lying areas adjacent to any rivers, creeks or ditches. The short-term weather forecast indicates rain amounts of 15-25 mm on Thurs. March 23 with temperatures well above zero, and cooler temperatures on Friday. Another precipitation event is forecast for Saturday and Sunday, but it’s unclear how much precipitation will fall, and if it will come…
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Watershed Conditions Statements
April 08, 2023
Flood Warning & Flood Watch – Update #1: Water Levels To Remain High Across Rideau Valley
(WCS - 06/2023) April 8, 2023 – The Flood Warning and Flood Watch issued on April 6, 2023 remains in effect for the Rideau Valley watershed. Flood conditions are present in many low-lying areas adjacent to several rivers, lakes, creeks and ditches. Additional areas have the potential to flood next week, as the remaining snow within the City of Ottawa and the Tay River watershed is expected to finish melting due to multiple days with high temperatures in the double digits. The short-term weather forecast indicates no precipitation for next few days. Staring on Monday April 10, 2023, temperatures will…
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Watershed Conditions Statements
April 18, 2023
Flood Warning – Update #3: Water Levels Continue to Decline Across the Rideau Valley Except in Upper Watershed Lakes
(WCS - 08/2023)April 18, 2023 – The previous Flood Warning and Flood Watch messages issued on April 6th, 8th and 11th 2023 are being updated to reflect current conditions. Unlike the Ottawa River Watershed which is currently experiencing high water conditions, the water levels and flows in the Rideau Valley Watershed are declining and approaching seasonal levels in all waterways except for Bobs Lake and Christie Lake. These lakes are near capacity and although the water level increases are now almost stabilized, the water levels may still increase with any significant rain. The current forecast indicates between 25 mm and 35 mm of…
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Watershed Conditions Statements
