Lake Rotoroa (Hamilton)

It was a high-energy, braided river carrying large volumes of volcanogenic sediment (Hinuera Formation), which was deposited over and around a pre-existing hilly landscape to form an alluvial plain.

[5] Innes Common, to the west, is 28 hectares (68 acres) of former wetland, bought by the Domain Board to protect the lake[6] and drained some time after 1883.

Copper, lead, mercury and zinc also exceed the Australian and New Zealand Environment and Conservation Council (ANZECC) guideline value in parts of the lake.

At Innes Common, a park on the west side of the lake is the Waikato Hockey Association Sports Ground.

It also holds a Learn to Sail programme and has regular racing on Wednesday evening and Saturday afternoons during the summer https://hyc.org.nz/.

There are also short bush walks and a small golf green[citation needed] on the west side of the lake.

Lake House viewed from the boardwalk. It was designed by Isaac Richardson Vialou in 1872 for Alfred Cox as the homestead of the Rukuhia Estate, which originally covered 6,000 hectares. Vialou became first mayor of Hamilton in 1878.