The Whroo Dam is situated about 10kms west of Ultima, and is (or was) a very big dam, perhaps two or three times the size of other Shire dams. Very thick scrub surrounds the dam, and signs of Aboriginal activity had been discovered. These had been carbon-dated by the Aboriginal Education Officer, Doug Nicholls, at the Pioneer Settlement as being at least 40,000 years old!!

The Whroo Dam is a large shire dam, situated about 10km west of Ultima and 29km east of Sea Lake on the Sea Lake Road. It was two or three times bigger than the usual dams, which were in place to enable people to water their stock, and for travellers to do likewise, because in the early days of settlement travellers moved about on horseback, in a gig, buggy or wagon, and needed access to water for their animals.