Earth Dam at Lake Mangaonui

The car is situated on the road built on top of the 20 metre high earth dam. The road crosses the spillway bridge before winding up the hill in the background.

Typical small stream in the Kaimais


The photo at the left illustrates the typical small stream that has been diverted to feed Lake Mangaonui.

Lake Mangaonui spillway - upstream view
Hydraulics for spillway gate control


Lake Mangaonui Spillway

The bridge leads to an earth dam on the right, and is part of the road network built to access all sites.
  Also seen is the spillway and above it an inflatable rubber dam to raise the lake level. At a later date the dam was replaced by four controllable gates.

Lake Mangaonui 1977


The photos have been taken when the lake level was at its highest point.

The area of Lake Mangaonui is 8.1 hectares.

Lake Mangaonui spillway - downstream view

The Mangaonui spillway gates replaced a rubber dam which was filled with compressed air to hold back the water . If a spill was required the bag would deflate.

Control panel for spillway gates at Lake Mangaonui