Ottawa RiverRegulationPlanning BoardCommission de planificationde la régularisationde la rivière des Outaouais

Current Conditions

Publication: 2025-08-09

Snow Map

Locations to display: River locations only | Reservoirs only | Other locations

Ottawa River at Temiscaming

Current Conditions

Daily Outflow (m3/s)
n/a
Graph View and Advanced Data

Grenville

Current Conditions

Water levels in metres
n/a
Graph View and Advanced Data

Thurso

Current Conditions

Water levels in metres
n/a
Graph View and Advanced Data

Gatineau (Hull)

Current Conditions

Water levels in metres
n/a
Graph View and Advanced Data

Lake Coulonge at Fort-Coulonge

Current Conditions

Water levels in metres
n/a
Graph View and Advanced Data

Ottawa River at Carillon

Current Conditions

Water levels in metres
n/a
Daily Outflow (m3/s)
n/a
Graph View and Advanced Data

Lake Deschenes at Britannia (Ottawa)

Current Conditions

Water levels in metres
n/a
Daily Outflow (m3/s)
n/a
Graph View and Advanced Data

Ottawa River at Chats Falls GS

Current Conditions

Water levels in metres
n/a
Daily Outflow (m3/s)
n/a
Graph View and Advanced Data

Ottawa River at Chenaux GS

Current Conditions

Water levels in metres
n/a
Daily Outflow (m3/s)
n/a
Graph View and Advanced Data

Pembroke

Current Conditions

Water levels in metres
n/a
Graph View and Advanced Data

Des Joachims

Current Conditions

Water levels in metres
n/a
Daily Outflow (m3/s)
n/a
Graph View and Advanced Data

Mattawa

Current Conditions

Water levels in metres
n/a
Graph View and Advanced Data

Ottawa River at Otto Holden GS

Current Conditions

Water levels in metres
n/a
Daily Outflow (m3/s)
n/a
Graph View and Advanced Data

River Levels and Flows

Water levels at 24:00h in metres2025-08-022025-08-032025-08-042025-08-052025-08-062025-08-072025-08-082025-08-09
Otto Holden Generating StationGraph View and Advanced Data Agency: OPG177.08177.12177.14177.44177.33177.28177.33177.27
MattawaGraph View and Advanced Data Agency: WSC152.33152.46152.46152.25152.40152.44152.39152.66
Des Joachims Generating StationGraph View and Advanced Data Agency: OPG152.09152.08152.10152.14152.10152.16152.20152.20
PembrokeGraph View and Advanced Data Agency: OPG111.42111.36111.34111.28111.26111.21111.18111.15
Lake Coulonge at Fort-CoulongeGraph View and Advanced Data Agency: HQ106.32106.27106.23106.23106.18106.14106.10106.09
Chenaux Generating StationGraph View and Advanced Data Agency: OPG86.0085.9886.0186.2286.0686.1286.2086.15
Chats Lake at ArnpriorGraph View and Advanced Data Agency: OPG73.9974.0774.0874.0774.0474.0674.0674.09
Lake Deschenes at Britannia (Ottawa)Graph View and Advanced Data Agency: WSC58.1658.1458.0958.0658.0057.9657.9357.91
Gatineau (Hull)Graph View and Advanced Data Agency: HQ41.4341.4041.4141.4141.4041.3641.3441.31
ThursoGraph View and Advanced Data Agency: HQ41.2241.2141.2341.2441.2441.2241.2141.21
GrenvilleGraph View and Advanced Data Agency: HQ41.1841.1841.1941.2141.2141.2041.1941.19
Carillon Generating StationGraph View and Advanced Data Agency: HQ41.1041.1041.1141.1241.1241.1141.1241.12
Average Daily Outflow (m3/s)2025-08-022025-08-032025-08-042025-08-052025-08-062025-08-072025-08-082025-08-09
Ottawa River at TemiscamingGraph View and Advanced Data Agency: PSPC502502503484456438431302
Ottawa River at Otto Holden GSGraph View and Advanced Data Agency: OPG528503509464488453404764
Des JoachimsGraph View and Advanced Data Agency: OPG611561557510539485354919
Ottawa River at Chenaux GSGraph View and Advanced Data Agency: OPG854883817741730681600888
Ottawa River at Chats Falls GSGraph View and Advanced Data Agency: OPG928852824852702695555931
Lake Deschenes at Britannia (Ottawa)Graph View and Advanced Data Agency: WSC1007928898836823771742711
Ottawa River at CarillonGraph View and Advanced Data Agency: HQ1415133112491228120311371097973

River Conditions Forecast

Last Update: 2025-08-05 3:02 PM
Next Update: 2025-08-12 4:00 PM

Water levels and flows along the main stem of the Ottawa River are within seasonal values for this time of year. They are expected to decrease slightly depending on locations over the next few days. Please take note of an important message from the ORRPB that is posted on the website Home page in the SPECIAL FEATURE section.

View complete forecast

Additional content

About this map

This map includes markers representing the location of gauges where information on flows and water levels are available. Data collected at gauges shown on the ‘River locations only’ and ‘Reservoirs only’ maps is used for the integrated management of the principal reservoirs within the Ottawa River Basin.

Instruction:

The coloured markers on this map depict conditions (level or flow) as a range of conditions categorized in three groups:  for normal conditions,  for above normal,  for below normal. The marker is  when the current day’s value or percentile are not available.

Click on any marker to see the most recent data from this location and what type of data is measured there. To view data related to the principal reservoirs in the basin, select ‘Reservoirs only’ in the upper right corner. Near real-time and historical data is available for additional locations by selecting ‘Graph View and Advanced Data’. Water levels at 24:00 means at midnight.

Terms of Use:

The data provided by this web service may not be reproduced or redistributed.  Contact the Ottawa River Regulation Secretariat (see Contact us) for information on how to obtain historical data directly from the data owner.

Users of flow data and water level data shown on this website are cautioned to consider the unverified nature of the information before using it for decisions making.  Please see the Disclaimer for further details.

The flow rate and actual levels can change rapidly without warning, particularly during the freshet period. We advise those using bodies of water to exercise caution and to follow safety rules at all times.

Understanding Range of Conditions:

The three ranges are based on percentiles, which are computed from the observations of the current day of the year over the last 30 years. The percentile (P) is the percent of all data that is lower than the actual value for the current day of the year.

 : Normal conditions, between P25% and P75%

 : Above normal conditions, P is equal or greater than P75%

 : Below normal conditions, P is lower than P25%

: Current day value or percentile not available