Document Type

Technical Report

Publication Date



Water quality -- Models -- Oregon -- Hood River County, Lakes -- Oregon -- Hood River County, Water-supply -- Models -- Oregon -- Hood River County, Hydrologic models, Hydrodynamics -- Mathematical models


Laurance Lake is a reservoir located in Hood River County, Oregon (Figure 1). It is located at the base on Mt. Hood in Oregon (see Figure 2 and Figure 3), discharges into the Middle Fork of the Hood River. The reservoir was constructed in 1968 for irrigation storage and has a capacity 3564 acre- feet at full pool. Since the river vio lates temperature standards, this study has been designed to construct a hydrodynamic and temperature model of Laurance reservoir in order to assess strategies for improving temperatures in the Middle Fork River.

The objectives of the study are then to

  • 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

The model chosen for development was CE-QUAL-W2 Version 3.2 (Cole and Wells, 2004). This is a two-dimensional unsteady hydrodynamic, temperature and water quality model that includes typical eutrophication parameters (algae, nutrients, temperature, organic matter, dissolved oxygen, pH). PSU, under the support of the Corps of Engineers Waterways Experiment Station, is a center for development of this modeling tool.


Technical Report EWR-01-04, prepared for Middle Fork Irrigation District by Maseeh College of Engineering and Computer Science Department of Civil and Environmental Engineering, Portland State University.

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