Current Conditions

Publication: 2025-03-23

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

River Levels and Flows

Water levels at 24:00h in metres	2025-03-15	2025-03-16	2025-03-17	2025-03-18	2025-03-19	2025-03-20	2025-03-21	2025-03-22
Otto Holden Generating StationGraph View and Advanced Data Agency: OPG	174.06	174.13	174.05	174.10	174.12	174.10	174.12	174.15
MattawaGraph View and Advanced Data Agency: WSC	151.67	151.76	151.86	152.16	152.08	152.22	152.15	152.34
Des Joachims Generating StationGraph View and Advanced Data Agency: OPG	150.01	150.06	150.06	150.00	150.01	150.16	150.20	150.07
PembrokeGraph View and Advanced Data Agency: OPG	111.67	111.68	111.72	111.80	111.86	111.89	111.89	112.04
Lake Coulonge at Fort-CoulongeGraph View and Advanced Data Agency: HQ	106.43	106.43	106.45	106.55	106.66	106.72	106.72	106.79
Chenaux Generating StationGraph View and Advanced Data Agency: OPG	86.07	86.26	86.18	86.05	86.24	86.50	86.52	86.46
Chats Lake at ArnpriorGraph View and Advanced Data Agency: OPG	74.08	74.24	74.15	74.07	74.15	74.21	74.24	74.37
Lake Deschenes at Britannia (Ottawa)Graph View and Advanced Data Agency: WSC	58.54	58.72	58.88	58.85	58.83	58.92	58.94	59.02
Gatineau (Hull)Graph View and Advanced Data Agency: HQ	42.42	42.67	43.22	43.16	42.93	42.96	42.96	42.86
ThursoGraph View and Advanced Data Agency: HQ	41.69	41.76	42.19	42.23	42.24	42.31	42.30	42.10
GrenvilleGraph View and Advanced Data Agency: HQ	41.43	41.44	41.62	41.60	41.72	41.71	41.74	41.64
Carillon Generating StationGraph View and Advanced Data Agency: HQ	41.00	40.90	40.72	40.52	40.46	40.43	40.43	40.41

Average Daily Outflow (m³/s)	2025-03-15	2025-03-16	2025-03-17	2025-03-18	2025-03-19	2025-03-20	2025-03-21	2025-03-22
Ottawa River at TemiscamingGraph View and Advanced Data Agency: PSPC	743	766	785	833	842	854	853	945
Ottawa River at Otto Holden GSGraph View and Advanced Data Agency: OPG	772	763	855	884	912	950	933	1068
Des JoachimsGraph View and Advanced Data Agency: OPG	925	884	1039	1136	1182	1161	1301	1487
Ottawa River at Chenaux GSGraph View and Advanced Data Agency: OPG	1317	1314	1389	1398	1446	1582	1742	1854
Ottawa River at Chats Falls GSGraph View and Advanced Data Agency: OPG	1504	1696	2001	1894	1866	2037	2157	2337
Lake Deschenes at Britannia (Ottawa)Graph View and Advanced Data Agency: WSC	1597	1615	2060	2096	2009	2096	2209	2360
Ottawa River at CarillonGraph View and Advanced Data Agency: HQ	2662	2775	3768	4338	4564	4730	5086	4984

River Conditions Forecast

Last Update: 2025-03-21 3:34 PM

Next Update: 2025-03-25 4:00 PM

Flows and water levels along the main stem of the Ottawa River are above normal for this time of year due to an early onset of freshet. With warmer temperatures, spring runoff is increasing and water levels and flows along the main stem of the Ottawa River are expected to increase slightly over the next few days in all locations. They should stabilize early next week, and are expected to receed later next week with the return of colder seasonal temperatures. Water levels in the reach between Gatineau (Hull) and Grenville are currently higher than anticipated due to possible ice effects as the ice cover becomes more fragile. Please refer to the Forecasts section of our website for more information about the water levels in your area and note that level forecasts for theGatineau (Hull) and Thurso locations have a higher uncertainty than usual. Minor flooding in low-lying areas may occur over the next week as a result of the increased spring runoff. Low-lying areas (such as recreational trails near water) are those locations that regularly flood during the spring freshet period.

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