Outflow from Table Rock Lake and other
White River reservoirs support a cold-water trout
fishery of substantial economic yield in south-central
Missouri and north-central Arkansas. The
Missouri Department of Conservation has
requested an increase in existing minimum flows
through the Table Rock Lake Dam from the U.S.
Army Corps of Engineers to increase the quality of
fishable waters downstream in Lake Taneycomo.
Information is needed to assess the effect of
increased minimum flows on temperature and dissolved-
oxygen concentrations of reservoir water
and the outflow.
A two-dimensional, laterally averaged,
hydrodynamic, temperature, and dissolved-oxygen
model, CE-QUAL-W2, was developed and
calibrated for Table Rock Lake, located in Missouri,
north of the Arkansas-Missouri State line.
The model simulates water-surface elevation, heat
transport, and dissolved-oxygen dynamics. The
model was developed to assess the effects of proposed
increases in minimum flow from about 4.4
cubic meters per second (the existing minimum
flow) to 11.3 cubic meters per second (the
increased minimum flow). Simulations included
assessing the effect of (1) increased minimum
flows and (2) increased minimum flows with
increased water-surface elevations in Table Rock
Lake, on outflow temperatures and dissolved-oxygen
In both minimum flow scenarios, water temperature
appeared to stay the same or increase
slightly (less than 0.37 ?C) and dissolved oxygen
appeared to decrease slightly (less than 0.78 mg/L)
in the outflow during the thermal stratification season.
However, differences between the minimum
flow scenarios for water temperature and dissolved-
oxygen concentration and the calibrated
model were similar to the differences between
measured and simulated water-column profile values.