Agate Lake is a reservoir located 1,510 feet (460 m) above sea level in Jackson County, Oregon, United States.

The lake is formed by the 86-foot (26 m) tall Agate Dam, which impounds Dry Creek, in the Rogue River watershed.

[3][4] The 86-foot (26 m) tall earth-fill embankment dam was completed by the Talent Division of the Rogue River Basin Project, impounding Dry Creek.

This water is mainly used for irrigation and the demand for it downstream is normally enough to reduce the reservoir to its minimum allowable level by September each year.

[3] Upstream (to the south of Agate Lake) trees such as willows, cottonwoods, and alders grow in Dry Creek's riparian zone.

To the north of Agate Lake blackberries, willows, alders, madrones, white oaks, and ponderosa pine inhabit this zone.

When filled, the pools are a known habitat for a threatened species of fairy shrimp, (branchinecta lynchi), which can be found in the winter and early spring.