Warrah Trig Station is part of a national geodetic survey established during the 1970's. The 'Triangulation station' (aka trigonometrical or trig station) is a distinct marker once clear of trees, and would have been visible for many kilometers in the area. There are many such trig stations around Australia, which were used to help in surveying. Each station has a know position and altitude, which allows surveyors to use triangulation and determine another point's location. With advances in technology, these trig stations have been abandoned and superseded. The trig station is now surrounded by trees, with some filtered views along the Hawkesbury River. The area is rich with wildflowers in spring.
Bushwalk