Current Conditions

Publication: 2025-07-18

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

River Levels and Flows

Water levels at 24:00h in metres	2025-07-11	2025-07-12	2025-07-13	2025-07-14	2025-07-15	2025-07-16	2025-07-17	2025-07-18
Otto Holden Generating StationGraph View and Advanced Data Agency: OPG	177.13	177.16	177.16	177.24	177.43	177.29	177.36	177.30
MattawaGraph View and Advanced Data Agency: WSC	152.57	152.56	152.47	152.42	152.47	152.45	152.48	152.59
Des Joachims Generating StationGraph View and Advanced Data Agency: OPG	152.07	152.12	152.16	152.09	152.07	151.97	152.00	152.07
PembrokeGraph View and Advanced Data Agency: OPG	111.77	111.70	111.68	111.67	111.65	111.64	111.62	111.58
Lake Coulonge at Fort-CoulongeGraph View and Advanced Data Agency: HQ	106.45	106.46	106.40	106.38	106.37	106.40	106.41	106.39
Chenaux Generating StationGraph View and Advanced Data Agency: OPG	86.32	86.26	86.29	86.08	86.21	86.09	86.11	86.16
Chats Lake at ArnpriorGraph View and Advanced Data Agency: OPG	74.20	74.19	74.17	74.09	74.08	74.07	74.11	74.10
Lake Deschenes at Britannia (Ottawa)Graph View and Advanced Data Agency: WSC	58.51	58.52	58.56	58.54	58.48	58.42	58.38	58.36
Gatineau (Hull)Graph View and Advanced Data Agency: HQ	41.87	41.89	41.91	41.89	41.86	41.74	41.70	41.65
ThursoGraph View and Advanced Data Agency: HQ	41.47	41.49	41.50	41.48	41.48	41.42	41.39	41.36
GrenvilleGraph View and Advanced Data Agency: HQ	41.35	41.34	41.36	41.35	41.35	41.31	41.30	41.29
Carillon Generating StationGraph View and Advanced Data Agency: HQ	41.10	41.10	41.10	41.11	41.09	41.10	41.10	41.11

Average Daily Outflow (m³/s)	2025-07-11	2025-07-12	2025-07-13	2025-07-14	2025-07-15	2025-07-16	2025-07-17	2025-07-18
Ottawa River at TemiscamingGraph View and Advanced Data Agency: PSPC	618	597	601	608	612	607	688	653
Ottawa River at Otto Holden GSGraph View and Advanced Data Agency: OPG	726	631	638	614	669	647	681	882
Des JoachimsGraph View and Advanced Data Agency: OPG	976	749	772	814	863	819	762	1060
Ottawa River at Chenaux GSGraph View and Advanced Data Agency: OPG	1293	1331	1298	1262	1189	1154	1191	1219
Ottawa River at Chats Falls GSGraph View and Advanced Data Agency: OPG	1489	1543	1581	1567	1417	1305	1248	1503
Lake Deschenes at Britannia (Ottawa)Graph View and Advanced Data Agency: WSC	1469	1515	1544	1577	1450	1379	1321	1290
Ottawa River at CarillonGraph View and Advanced Data Agency: HQ	2608	2635	2669	2725	2646	2436	2434	2425

River Conditions Forecast

Last Update: 2025-07-15 3:01 PM

Next Update: 2025-07-22 4:00 PM

Water levels and flows along the main stem of the Ottawa River are above average for this time of year. They are expected to decrease gradually in most 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. On the ‘River locations only’ map, the colour of the markers for locations with run-of-river facilities is based on flow conditions. On the ‘Reservoirs only’ map, the marker colour for all locations is based on the water level in the reservoir.

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 for information on how to obtain historical data directly from the data owner.

Users of the flow data, water level data, and hydrological forecasts shown on this website must recognize that such information is considered preliminary data. Users must therefore accept that the information provided carries an unspecified level of uncertainty and are advised to be cautious if they intend to use the information for decision-making. Please see the Disclaimer for further details.

The flow rates 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 always follow established safety guidelines when near water.

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 a period of 30 years (1991-2020). 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 P10% and P90%

: Above normal conditions, P is equal or greater than P90%

: Below normal conditions, P is lower than P10%

: Current day value or percentile not available