[2] The earliest known activity in Fena Valley was during the Latte Period, during which ancient CHamoru communities cultured food crops and established settlements.

During the late 17th century, the Spanish began the reducción, a policy that relocated native populations to central villages under direct colonial control.

This situation parallels challenges faced at the Shasta Dam in California, where sedimentation has diminished storage capacity and affected water supply, hydroelectric power generation, and flood control.

[3] The future operation of the Fena Valley Reservoir remains uncertain, as discussions regarding the potential integration of military and civilian water infrastructure continue to unfold.

This MOU was established to foster cooperation between the two entities regarding utility systems, to streamline water infrastructure in preparation for the island's growing population and the increasing demands of the military presence.

[3] The valley’s subsurface is characterized by a highly permeable surficial layer in the western part of the watershed, where rainfall infiltrates into the soil and underlying rocks, which later resurfaces through springs that contribute to the reservoir’s water supply.

It is noted that volcanic soils in the region are highly weatherable when vegetation is cleared, which is a concern for erosion and sedimentation that can contribute to loss of storage capacity in the reservoir.

Fena is home to Guam's largest population of common moorhens (Gallinula chloropus guami) and historically provided habitat for the Marianas fruit bat (Pteropus mariannus), though the species is no longer present.

The reservoir supports eels, tilapia, catfish, gobies, flagtails, and shrimp, while the valley’s forests shelter pigs, deer, and brown tree snakes.

According to informant Jose de Lizama of Hågat (age 109 years), a large rock called Sagman, resembling a canoe, was transported to Fena by the men of Orote.

This story highlights the connection between the people of Orote, Haputu, and Taipilan, linking the cultural landscape of Fena to the historical narratives of Guam.

By the time archeologist Douglas Osborne visited Fena in 1947, the latte stones had been displaced due to the establishment of a skeet and .22 shooting range.