Grand Lake is a 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,...

 in the Ottawa River

Ottawa River

The Ottawa River is a river in the Canadian provinces of Ontario and Quebec. For most of its length, it now defines the border between these two provinces.-Geography:...

 drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 in the geographic townships of Barron and Stratton in the Unorganized South Part

Nipissing, Unorganized, South Part, Ontario

Unorganized Nipissing South Part is an unorganized area in north-central Ontario, in the District of Nipissing. It makes up a large area and includes most of Algonquin Provincial Park.-Communities:*Acanthus*Achray*Brent*Canoe Lake*Coristine*Daventry...

 of Nipissing District in Northeastern

Northeastern Ontario

Northeastern Ontario is the region within the Canadian province of Ontario which lies north and east of Lakes Superior and Huron.Northeastern Ontario consists of the districts of Algoma, Sudbury, Cochrane, Timiskaming, Nipissing and Manitoulin; and the single-tier municipality of Greater...

 Ontario

Ontario

Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

.

The lake is long and narrow and lies in an east-west orientation, mostly in Barron Township except for the southeastern end which is in Stratton Township; it is entirely within Algonquin Provincial Park

Algonquin Provincial Park

Algonquin Provincial Park is a provincial park located between Georgian Bay and the Ottawa River in Central Ontario, Canada, mostly within the Unorganized South Part of Nipissing District. Established in 1893, it is the oldest provincial park in Canada. Additions since its creation have increased...

. The primary inflows are the Barron River

Barron River (Ontario)

The Barron River is a river in the Saint Lawrence River drainage basin in Nipissing District and Renfrew County, Ontario, Canada...

 from its source at Clemow Lake at the west and Carcajou Creek at the large Carcajou Bay at the southeast, and primary outflow is the Barron River, controlled by the Grand Lake Dam, which flows at the east to Stratton Lake and further via the Petawawa River

Petawawa River

The Petawawa River is a river in the Saint Lawrence River drainage basin in Nipissing District and Renfrew County in eastern and northeastern Ontario, Canada. The river flows from Algonquin Provincial Park to the Ottawa River at the town of Petawawa...

 to the Ottawa River.

Grand Lake is crossed in the middle by the originally Canadian Northern Railway

Canadian Northern Railway

The Canadian Northern Railway is a historic Canadian transcontinental railway. At its demise in 1923, when it was merged into the Canadian National Railway , the CNoR owned a main line between Quebec City and Vancouver via Ottawa, Winnipeg, and Edmonton.-Manitoba beginnings:CNoR had its start in...

, later Canadian National Railway

Canadian National Railway

The Canadian National Railway Company is a Canadian Class I railway headquartered in Montreal, Quebec. CN's slogan is "North America's Railroad"....

, main line

Main line (railway)

The Mainline or Main line of a railway is a track that is used for through trains or is the principal artery of the system from which branch lines, yards, sidings and spurs are connected....

, now abandoned. The Achray

Achray, Ontario

Achray is an unincorporated place and former railway point in geographic Stratton Township in the Unorganized South Part of Nipissing District in northeastern Ontario, Canada...

 park campground, formerly a station on the railway, is located on the north shore, and the unincorporated place of Hydro is on the former railway line at the western tip of the lake, near where a Hydro One

Hydro One

Hydro One Incorporated delivers electricity across the Canadian province of Ontario. It is a Corporation established under the Business Corporations Act with a single shareholder, the Government of Ontario....

 hydroelectricity

Hydroelectricity

Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy...

 transmission line

Transmission line

In communications and electronic engineering, a transmission line is a specialized cable designed to carry alternating current of radio frequency, that is, currents with a frequency high enough that its wave nature must be taken into account...

passes.

Tributaries

"right" and "left" are with reference to the Barron River

• Barron River
• Carcajou Creek (right)
• Johnston Creek (left)
• Rowan Creek (left)
• Borutski Creek (left)
• Depot Creek (left)