Cotter River

The Cotter River, a pristine tributary of the Murrumbidgee, carves a cool green corridor through the bushland west of Canberra. This is where locals escape the capital’s heat, plunging into deep swimming holes and picnicking beneath towering eucalypts. The river’s three linked dams supply Canberra’s drinking water, so the landscape feels refreshingly wild and protected.

Highlights & What to See

• Cotter Avenue picnic area & swimming hole – The main hub, with grassy banks, barbecues, and a wide, deep pool perfect for a summer dip. The historic Cotter Bridge adds a scenic backdrop.
• Bendora Arboretum – A short drive upstream, this 1940s experimental forest features exotic tree species from around the world, with walking trails and birdlife.
• Mount Stromlo Observatory – Perched on a nearby hill, this working observatory offers fascinating exhibits, guided tours, and panoramic views over the river valley.
• Namadgi National Park – The river rises here; the park’s alpine landscapes, hiking trails, and Aboriginal rock art sites are a wild extension of the Cotter experience.
• Cotter Dam lookout – A short walk from the picnic area leads to a viewpoint over the dam wall, with interpretive signs about the water supply system.

Suggested Time to Spend

Half a day is ample for a relaxed visit: a couple of hours swimming and lunching at the picnic area, plus an hour for the arboretum or dam lookout. If you’re keen to explore Namadgi’s trails, budget a full day. The river is most inviting in summer (December–February), but autumn offers pleasant walking weather and golden foliage.

Nearby Areas Worth Combining

• Canberra – The national capital is just 20 minutes east, with its museums, galleries, and cafés.
• Namadgi National Park – For serious hiking, wildlife spotting, and Aboriginal heritage.
• Tidbinbilla Nature Reserve – A 30-minute drive, home to kangaroos, koalas, and the Tidbinbilla Deep Space Tracking Station.
• Murrumbidgee River Corridor – Follow the river downstream for more swimming spots and walking trails.
• Brindabella Range – A scenic drive west offers mountain views and historic gold-mining towns.

Please check official sources for current details.