Laurel Spring is located along the southern boundary of the caldera, probably within the ring-fracture zone. The spring consists of one main vent area, in which a shallow pool about 5 feet across is fed from several sources around its perimeter. The nonthermal water (11-12°C) wells up or flows out from colluvium near the base of Laurel Mountain at an altitude of 7,200 feet. A 90° V-notch weir located in the discharge channel about 30 feet from the vent pool controls stage. Mean daily discharge was computed from stage record collected on a chart recorder during 1985-1987. The stage record was converted to discharge volume using the standard rating for a V-notch weir. Instantaneous discharge was measured about a dozen times between 1991 and 1992, and ranged from 0.56 cfs (Sept. 1992) to 0.99 cfs (July 1991). We monitor the spring conditions to learn more about shallow cold-water system.