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Modeling Application: Temperature


Laurance Lake is located in Hood River County, OR

In 2005[1], a hydrodynamic and temperature model was developed with CE-QUAL-W2 for Laurance Lake in Hood River County, Oregon. The reservoir empties into the Middle Fork of the Hood River, and since Hood River currently violates temperature standards, a hydrodynamic and temperature CE-QUAL-W2 model was developed to assess strategies for improving temperatures in the Middle Fork River.

The objectives of this study were defined as:

  • Develop a hydrodynamic and temperature model of Laurance Lake
  • Calibrate the model to field data collected from November 2002 through Spring 2004
  • Use the model to evaluate strategies for temperature improvement through operational or structural changes to Lake Laurance

Data Needs

  1. Geometry Data
    • Lake bathymetry: Bathymetry was developed using depth soundings, a USGS digital elevation map (DEM), and a bathymetric contour map provided by the Middle Fork Irrigation District.
  2. Initial Conditions
    • Initial Temperature: A single vertical profile was used for the initial temperature
  3. Boundary Conditions
    • Meteorological data: Meteorological data was measured at the dam and at an agrimet station located in a nearby city.
    • Daily outflows: The outflow file was developed from data provided by the Middle Fork Irrigation District (MFID)
    • Daily inflows: Inflows were based on gaging station data. Where gaging data was not available, a regression equation was used.
    • Inflow temperatures: Inflow temperatures were measured directly.

Monitoring Needs

  1. In-Pool/In-Situ Data
    • Vertical temperature profiles: Temperature probes located along the dam were measured continuously over the simulation period.
  2. Water Budget
    • Daily water level at upstream system boundary


  1. Berger, C., Wells S., & Annear, R. (2005). Laurance Lake Temperature Model. Portland State University. Go