The Rivière Blanche in the Outaouais region of Quebec runs approximately 30 kilometres between Lac Blanche and the Ottawa River. It is classified as a sporty river with rapids and multiple portages, and paddlers should expect significant time on land navigating around obstacles — one account notes that a two-day paddle requires an additional day or two for portaging through the bush.

The river is best suited for spring paddling, when snowmelt provides adequate water levels. The watershed is relatively small, meaning water levels drop quickly outside of peak runoff periods. A paddler who attempted the run in late August following several days of rain found the river marginally navigable but still very demanding, covering only about 6.4 kilometres in six hours due to the portaging required. Summer attempts without recent rainfall are generally not recommended.

Put-in is at the bridge at Lac Blanche, accessible via Route 315. Shortly downstream from the put-in there is a dam that paddlers will need to navigate around. The river's character involves numerous rapids interspersed with portages through forested terrain.

Canot Kayak Québec has produced a digital map of the route, available through the Avenza Maps app, which marks launch points, rapids, portages, camping sites, and other points of interest along the river corridor. The map is free to download and covers the full route. Paddlers planning a trip should obtain this map in advance, as the river does not appear in the standard printed guide to Quebec's canoe routes, making independent navigation resources particularly important.