HIGHLANDS RESERVOIR. Highlands Reservoir is on Goose Creek in the San Jacinto River basin one mile northeast of Highlands, one mile upstream from McNair, and two miles north of Interstate Highway 10 in east central Harris County (centered at 29°50' N, 95°02' W). The reservoir is owned by the San Jacinto River Authority and is a mile long and a mile wide; it has a normal capacity of 3,800 acre-feet. The twelve-foot-high Highlands Reservoir Dam has a crest length of 34,700 feet; it was constructed by the Federal Works Agency in 1943. The reservoir is used for local water supply.