Rainy River (British Columbia)
Encyclopedia
The Rainy River is a short river that enters the Thornbrough Channel at Port Mellon. While it does come close to doing so, it never enters Tetrahedron Provincial Park
Tetrahedron Provincial Park
Tetrahedron Provincial Park is a provincial park in British Columbia, Canada, located northeast of Sechelt in the Sunshine Coast area of the province. The park was created in 1995.-External links:*...

.

Course

The Rainy River originates in a small unnamed lake
Lake
A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 just north of Tetrahedron Peak. The river, shortly after exiting the lake, likely drops over a fairly tall waterfall as it drops down a headwall
Headwall
In physical geography and geology the headwall of a glacial cirque is its highest cliff.In civil engineering, a headwall is a small retaining wall placed at the outlet of a stormwater pipe or culvert....

. The river flows southeast for about 3.6 km before turning south and flowing that way for about 9.8 km to its mouth at Port Mellon. The river does not receive any major tributaries.
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