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March 30, 2023
FLOOD WATCH: Localized Flooding Possible as Precipitation, Warmer Weather Increase Rideau Valley Water Levels
(WCS – R04/2023) RIDEAU VALLEY, March 30, 2023 – A Flood Watch has been issued for the Rideau Valley as a rainy weekend mixes with the residual snowpack still intact in some areas after a cool March. Potential flooding could begin to impact low-lying areas as early as Saturday and continue throughout next week. Since early March, we have experienced a very gradual snow melt with some precipitation across the Rideau Valley Watershed. As such, snow remains in some parts of our watershed, most prominently in the City of Ottawa and the Tay River watershed, which indicates a potential for flooding in…
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Watershed Conditions Statements
April 06, 2023
FLOOD WARNING & FLOOD WATCH: Significant Rain Causes Water Levels To Rise Across Rideau Valley
(WCS – R05/2023) RIDEAU VALLEY, April 6, 2023 – A combined Flood Warning and Flood Watch is in effect for the Rideau Valley following a significant rain/freezing rain event yesterday. Flood conditions are present in many low-lying areas adjacent to several rivers, creeks and ditches. Additional areas have the potential to flood over the next few days, especially because of snow remaining within the City of Ottawa and the Tay River watershed. The short-term weather forecast indicates no precipitation for next few days. Daytime temperatures will generally be above zero and night-time temperatures will be below zero for next few days. Temperatures…
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Watershed Conditions Statements
March 09, 2023
SPRING OUTLOOK - With High Snowpack, Prepare for Spring Flooding Across the Rideau Valley
(WCS – R02/2023) RIDEAU VALLEY, March 9, 2023 – The winter of 2022-23 is quickly coming to an end, and RVCA’s Flood Forecasting team is working closely with its municipal and agency partners to prepare for potential spring flooding. As discussed below, it is important to be prepared for possible flood conditions over the next few weeks as spring returns to the Rideau Valley watershed. Current conditions: This winter has been unusually mild with some rain events and approximately 300 cm of snow fallen to date in the Ottawa area. The snowpack varies throughout the Rideau Valley Watershed, but in general the…
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Watershed Conditions Statements
December 21, 2022
WATER SAFETY STATEMENT - Significant Precipitation Event Will Cause Increased Water Levels Across Rideau Valley Watershed
(WCS – R09/2022) December 21, 2022 – Caution is advised as a major winter storm makes its way to the Rideau Valley this week. Environment Canada’s short-term weather forecast indicates precipitation will begin as rain or snow late Thursday, Dec. 22 before transitioning to rain on Friday. Rainfall amounts of up to 40 mm are forecasted for Friday before the temperature drops below zero. Falling temperatures will be accompanied by strong winds along with more snow. Water levels and flows are generally low to average for this time of year across the Rideau Valley Watershed. Although no significant flooding is anticipated,…
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Watershed Conditions Statements
March 26, 2021
Flood Outlook — Lower Ottawa River | Perspective de crue – Cours inférieur de la rivière des Outaouais
Water Conditions Statement: Flood Outlook — Lower Ottawa River March 26, 2021 — A Flood Outlook Statement is being issued for areas along the Lower Ottawa River. Based on current snow cover and weather forecast, it is anticipated that levels and flows along the main stem of the river from Arnprior to Hawkesbury are expected to begin to rise over the next few days but will remain within the normal range of fluctuations associated with the spring freshet period. Presently, the snow cover varies significantly across the 146,300 square kilometre Ottawa River basin, with some areas in the south of the…
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Watershed Conditions Statements
April 20, 2020
Flood Watch Termination — Lower Ottawa River / Fin de la veille de crue — Cours inférieur de la rivière des Outaouais
Water Safety Statement Remains in Effect April 20, 2020 — The Flood Watch issued on April 9, 2020 is being TERMINATED. A Water Safety Statement is in effect as all areas are experiencing high spring flows which are typical for this time of year. The Ottawa River Regulation Committee has indicated that levels are decreasing along the main stem of the Ottawa River from Pembroke down to the Montreal region as runoff from melting snow in tributaries decreases. It is expected that levels will continue decreasing to normal spring freshet levels as no major precipitation is forecasted over the next…
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Watershed Conditions Statements
April 09, 2020
Flood Watch — Lower Ottawa River / Veille de crue — Cours inférieur de la rivière des Outaouais
April 9, 2020 — A Flood Watch is being issued for areas along the Lower Ottawa River. Water levels and flows from Arnprior to Hawkesbury continue to rise gradually due to on-going snowmelt in the central and northern portions of the Ottawa River basin. On Monday a spring storm is expected to bring above average temperatures and a significant amount of rainfall. Minor flood levels may be exceeded in low-lying, flood prone areas depending on the temperatures and precipitation received. Levels and flows are expected to stabilize into the weekend and will continue to rise beginning on Monday. Levels are…
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Watershed Conditions Statements
May 3, 2019 — Rideau Valley Conservation Authority (RVCA), in conjunction with the Mississippi Valley Conservation Authority (MVCA) and South Nation Conservation (SNC) is maintaining the FLOOD WARNING issued on April 19, 2019 for the areas under our jurisdiction along the Ottawa River. The most recent model outputs from the Ottawa River Regulation Committee (ORRC) indicate that water levels have peaked on Lac Coulonge and are expected to begin rising again over the next few days. Along the Ottawa River below Lac Coulonge, levels are expected to remain stable or slowly decline over the next few days in all locations. All flood-prone areas…
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Watershed Conditions Statements
May 10, 2019 — Rideau Valley Conservation Authority (RVCA), in conjunction with the Mississippi Valley Conservation Authority (MVCA) and South Nation Conservation (SNC) is maintaining the FLOOD WARNING issued on April 19, 2019 for the areas under our jurisdiction along the Ottawa River. The most recent analysis from the Ottawa River Regulation Committee (ORRC) indicate that water levels along the Ottawa River from Mattawa to Montreal are increasing due to recent precipitation and increased flow from the upper part of the watershed. Water levels are not expected to reach the levels observed last week over the forecasted period. All flood-prone…
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Watershed Conditions Statements
May 14, 2019 — Rideau Valley Conservation Authority (RVCA), in conjunction with the Mississippi Valley Conservation Authority (MVCA) and South Nation Conservation (SNC) is maintaining the FLOOD WARNING issued on April 19, 2019 for the areas under our jurisdiction along the Ottawa River. The most recent analysis from the Ottawa River Regulation Committee (ORRC) indicate that water levels along the lower Ottawa River from Chats Lake to the Grenville/ Hawkebury area have stabilized and will slowly recede in the coming weeks. All flood-prone areas along the Ottawa River from Lac Coulonge down to the Montreal Archipelago are at risk as…
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Watershed Conditions Statements
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April 25, 2019 — Rideau Valley Conservation Authority (RVCA), in conjunction with the Mississippi Valley Conservation Authority (MVCA) and South Nation Conservation (SNC) is maintaining the FLOOD WARNING issued on April 19, 2019 for the areas under our jurisdiction along the Ottawa River. Significant rainfall has fallen over the Ottawa River basin since Thursday, April 18, 2019. There is additional rainfall amounts of 25 to 50 mm forecast over the next 24 to 36 hours. All flood-prone areas along the Ottawa River from Lac Coulonge down to the Montreal Archipelago are at risk. Peak water levels across many areas of the…
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Watershed Conditions Statements
April 03, 2019
Flood Warning has Ended, But Flood Watch Still in Effect for Low-lying Areas in Rideau Valley Watershed
April 3, 2019 -- With limited precipitation and below seasonal temperatures so far this week, water levels and flows have somewhat stabilized across the Rideau Valley Watershed since last weekend. The flood warning issued over the weekend is now over for the areas listed below; however, a flood watch is still in effect for these areas. With snow still on the ground in some areas, combined with forecasted warmer temperatures and precipitation later this week, increased water levels and flows in all waterways in the Rideau Valley Watershed are still expected in the days to come. Areas currently under a…
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Watershed Conditions Statements
May 17, 2019 — Rideau Valley Conservation Authority (RVCA), in conjunction with the Mississippi Valley Conservation Authority (MVCA) and South Nation Conservation (SNC) is maintaining the FLOOD WARNING issued on April 19, 2019 for the areas under our jurisdiction along the Ottawa River. The most recent analysis from the Ottawa River Regulation Committee (ORRC) indicate that water levels along the lower Ottawa River from Chats Lake to the Grenville/ Hawkesbury area are slowly declining but remain high. All flood-prone areas along the Ottawa River from Lac Coulonge down to the Montreal Archipelago are at risk as spring runoff continues along…
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Watershed Conditions Statements
June 23, 2016
Drought Expected to become Moderately Severe
With no rain until Monday in weather forecasts, it is expected that the drought status for the Rideau River watershed will pass the threshold from Minor to Moderate Severity by Sunday. The amount of rain forecast for Monday will do little to reverse the trend of deepening drought. Flows in the Rideau River at Ottawa are 15% of normal for the time of year. Larger tributary streams are about 6% of normal and many small streams are intermittent or dry. Aquatic habitat is becoming limited for all species.
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Watershed Conditions Statements
