1956 Map of Upper Piihonua

About this map

Geological history is etched into the landscape of the Piihonua Hilo Forest Reserve, where multiple volcanic events are documented through distinct terrain markings. The mid-1950s survey captures the intersection of natural hazards and infrastructure, specifically where Saddle Road and a Telephone Line traverse older volcanic deposits. A chronological sequence of eruptions is visible, ranging from the Lava Flow of 1852 up through the more recent Lava Flow of 1942.