| Rivière à Pierre | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Capitale-Nationale and Saguenay-Lac-Saint-Jean |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | Charlevoix Regional County Municipality and Le Fjord-du-Saguenay Regional County Municipality |
| Subdivision Type5: | Municipalities |
| Subdivision Name5: | Ferland-et-Boilleau |
| Length: | 19.8km (12.3miles)[1] |
| Discharge1 Location: | Ferland-et-Boilleau |
| Source1: | Girard Lake |
| Source1 Location: | Laurentides Wildlife Reserve |
| Source1 Coordinates: | 47.9609°N -70.9449°W |
| Source1 Elevation: | 668m (2,192feet) |
| Mouth: | Lake Ha! Ha! |
| Mouth Location: | Ferland-et-Boilleau |
| Mouth Coordinates: | 48.05°N -70.8506°W |
| Mouth Elevation: | 498m (1,634feet) |
| Tributaries Right: | Outlet of "lac Légal". |
The rivière à Pierre (English: Pierre's River) is a stream flowing in Quebec, in Canada. It crosses the administrative regions of:
The "rivière à Pierre" river valley is served by some forest roads for the needs of forestry and recreational tourism activities.[2] Forestry is the main economic activity in the sector; recreational tourism, second.
The surface of the "Rivière à Pierre" is usually frozen from the beginning of December to the end of March, however the safe circulation on the ice is generally done from mid-December to mid-March.
The main watersheds neighboring the "Rivière à Pierre" are:
The "rivière à Pierre" rises at the mouth of Girard Lake (altitude: 668m (2,192feet)) in the Laurentides Wildlife Reserve. This source is located at:
From its source (Girard Lake), the course of the "rivière à Pierre" flows over 19.8km (12.3miles) according to the following segments:
The Pierre river flows into a small bay on the west shore of Lake Ha! Ha!. This mouth is located at:
From the confluence of the "rivière à Pierre" and Lake Ha! Ha!, the current follows the course of the Ha! Ha! River on 38.9km (24.2miles) generally towards the north, crosses the Baie des Ha! Ha! on 11km (07miles) towards the northeast, then follows the course of the Saguenay River on 99.5km (61.8miles) towards the east until Tadoussac where it merges with the Saint Lawrence Estuary.
The toponym "Rivière à Pierre" was formalized on December 5, 1968, by the Commission de toponymie du Québec.[3]