ABSTRACTBoyer TA, Melstrom RT, Sanders LD. 2017. Effects of climate variation and water levels on reservoir recreation. Lake Reserve Manage. 00:1–11.We combined information on valuation, visitation, and time-varying site quality to measure the effects of climate variation and reservoir water levels on recreational demand at Fort Cobb Reservoir, Oklahoma. A time series model of monthly visitation was estimated to measure the effect of water levels, rainfall, wind speed, and air temperature fluctuations on visitation to the reservoir. The results provide no evidence that visitation is affected by rainfall and wind speed but strong evidence that visitation is affected by water levels and air temperature, even after controlling for seasonality in demand. The results suggest annual reservoir visitation will increase by 2.3% for a 0.5 C (1 F) increase in average annual temperature, but that this increase will vary depending on the month and baseline temperatures; managers can expect an increase of 3.5% to occur in October through May, with essentially no increase in June through September. Visitation increases due to temperatures could potentially be offset with slight changes in water levels away from normal pool heights, however. To illustrate the potential use of these predictions in benefit and damage assessments of environmental change, a nonmarket valuation method was employed to value recreational trips to the reservoir. The results indicate a trip is worth about $60 per person. With explicit values for recreation, lake and reservoir managers may find it easier to gauge the economic benefits of managing lake levels for nonconsumptive uses.