UPDATE: In December 2010 the Smith's Road bridge over the Gudgenby River was washed away. There are some pictures of the bridge today here.
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A nice Drive to the start of the Monaro Plains led along Angle Crossing Road to the Gudgenby River Bridge. The Gudgenby River of the Australian Capital Territory starts below Yankee Hat at an elevation of 995m and ends near Namadgi National Park Visitor Centre at an elevation of 573m merging with the Murrumbidgee River. The Gudgenby River drops around 422m over its 34.7km length

Nine other water courses feed the Gudgenby River (ordered by descending elevation): Bogong Creek (981m), Middle Creek (981m), Hospital Creek (962m), Dry Creek (925m), Nursery Creek (906m), Orroral River (842m), Half Moon Creek (654m), Booroomba Creek (644m) and Naas River (631m).

The ACT Government has plans in the future to possibly pump water from Gudgenby through Burra to Googong Dam thus increasing the availability of water to the ACT's supply.