The route heads northeast around the reservoir as a two-lane highway, intersecting CR 13 (Stryker Road) in an area of open fields before crossing Schoharie Creek a short distance downstream from the Gilboa Dam.

Outside of Gilboa, NY 990V turns to the southeast, paralleling the eastern edge of the reservoir as it runs through a stretch of forests and passes directly south of Gilboa-Conesville Central School.

The road continues northeastward from West Conesville, serving a handful of scattered homes separated by stretches of woodland and open fields.

The portion east of Schoharie Creek became state-maintained on August 28, 1917, following a $46,774 project (equivalent to $1,112,371 in 2025) to improve the existing road to state highway standards.

[16] When the modern reference route system was created, the Gilboa–Conesville state highway was designated as NY 990V.