| Rivière du Lac Onésime | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | Le Fjord-du-Saguenay Regional County Municipality |
| Subdivision Type5: | City |
| Subdivision Name5: | Saguenay (city) |
| Length: | 2.5km (01.6miles) |
| Discharge1 Location: | Saguenay (city) |
| Source1: | Lac Onésime |
| Source1 Location: | Saguenay (city) |
| Source1 Coordinates: | 48.4806°N -71.4075°W |
| Source1 Elevation: | 169 |
| Mouth: | Saguenay River |
| Mouth Location: | Saguenay (city) |
| Mouth Coordinates: | 48.4806°N -71.4075°W |
| Mouth Elevation: | 67m (220feet) |
The Rivière du Lac Onésime is a tributary of the Saguenay River, flowing in the city of Saguenay (city), in the administrative region of Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada.
The Lac Onésime river valley is served by Wilbrod Road, Saint-André Road and Montée Duperré, mainly for the needs of forestry and agriculture.
Agriculture is the main economic activity in the Onésime lake river area; forestry, second.
The surface of the Lac Onésime river is usually frozen from the beginning of December to the end of March, however the safe circulation on the ice is generally made from mid-December to mid-March.
The main watersheds neighboring the "rivière du Lac Onésime" are:
The Lac Onésime river rises at Lac Onésime (length: 0.7km (00.4miles); altitude: 169m (554feet)) in the municipality of Larouche . From its source (Onésime lake), the "rivière du Lac Onésime" flows north over 2.5km (01.6miles) with a drop of 102m (335feet) in forest and agricultural areas. The course of this stream couples Saint-Wilbrod Road and Saint-André Road.[1]
The course of the river Onésime flows into the bottom of Anse à Brillant on the south bank of the Saguenay River. This confluence is located at:
From the mouth of the Lac Onésime river, the current follows the course of the Saguenay River for 112km (70miles) east to Tadoussac where it merges with the Saint Lawrence estuary.[1]
The term "Onésime" is a first name of French origin.
The toponym “Rivière du Lac Onésime” was formalized on August 28, 1980, at the Place Names Bank of the Commission de toponymie du Québec.[2]