Ka Loko Reservoir, reservoir in Kauai County, Hawaii, United States

Ka Loko Reservoir is an earthen-dam reservoir on the north side of Kauaʻi, Hawaii, about 5 km southeast of Kīlauea. The dam is 12 m high and 24 m long, and the reservoir held around 1.2 million cubic metres of water. The photograph shows opaque brown water against a steep, freshly exposed bank of reddish-brown earth, with fallen branches and pale trunks on the bare soil.

The reservoir was built many years ago to store water for local farms and households, serving agriculture in the region during its early years. Its story was shaped by a dam failure in 2006 after heavy rains that sparked ongoing discussions about the management of aging infrastructure.

The reservoir's water once irrigated sugarcane fields whose harvest was processed at a refinery in Kīlauea. After two decades without use, it was visited only by anglers before the 2006 dam failure. The name Ka Loko is sometimes spelled Kaloko.

The reservoir is on private land and is not open to visitors; the earthen dam sits about 5 km southeast of Kīlauea on the Wailapa Stream, roughly 200 m above sea level in the Makalena mountains. The 2006 breach left a large exposed scar of reddish-brown earth along the shoreline, visible from the water's edge. Access is by permission only.

The site is particularly remembered for a dam failure in 2006 that caused flooding after heavy rains and resulted in seven deaths. This event had far-reaching impacts on local infrastructure and led to increased attention on the safety of dams across Hawaii.